# Hf–Ni phases

> Hf–Ni system: 18 phases (tier A 8, tier C 7, liquid 1, needs_review 2); 18 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references.

HTML: https://data.orchid-project.org/phases/pages/HF-NI.html · Markdown: https://data.orchid-project.org/phases/pages/HF-NI.md

18 phases (tier A 8, tier C 7, liquid 1, needs_review 2); 18 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: [interactive registry](https://orchid-project.org/phases/?q=HF-NI) · [full JSON](https://data.orchid-project.org/phases/systems/HF-NI.json) · [Hf–Ni system page](https://data.orchid-project.org/systems/HF-NI.html) · [Markdown](https://data.orchid-project.org/phases/pages/HF-NI.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Hf–Ni system (18)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-hf-ni-bcc-a2); _phase:hf-ni:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 5 of 5 calculated diagram(s): 1427.62–2539.46 K, x(Ni) 0–0.08438 | 6 | 6 |
| [B2_BCC](#phase-hf-ni-bcc-b2); _phase:hf-ni:bcc-b2_ | CsCl · B2 · cP2 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1350.9–2516.97 K, x(Ni) 0–0.50634 | 5 | 1 |
| [FCC_A1](#phase-hf-ni-fcc-a1); _phase:hf-ni:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 5 of 5 calculated diagram(s): 300–3999.62 K, x(Ni) 0.98196–1 | 7 | 6 |
| [L12_FCC](#phase-hf-ni-fcc-l12); _phase:hf-ni:fcc-l12_ | AuCu3 · L1_2 · cP4 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1160–1700 K, x(Ni) 0.99–0.99 | 5 | 1 |
| [HCP_A3](#phase-hf-ni-hcp-a3); _phase:hf-ni:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 5 of 5 calculated diagram(s): 300–2016.68 K, x(Ni) 0–0.0133 | 5 | 5 |
| [HF2NI_C16](#phase-hf-ni-hf2ni-c16); _phase:hf-ni:hf2ni-c16_ | Al2Cu · C16 · tI12 · I4/mcm (140) | tier A: standard phase name | stable in 5 of 5 calculated diagram(s): 300–1562.55 K, x(Ni) 0.31648–0.33333 | 3 | 5 |
| [HF2NI5](#phase-hf-ni-hf2ni5); _phase:hf-ni:hf2ni5_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–1612.16 K, x(Ni) 0.71429–0.71429 | 0 | 1 |
| [HF2NI7](#phase-hf-ni-hf2ni7); _phase:hf-ni:hf2ni7_ | Ni7Zr2 · mC36 · C2/m (12) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 5 of 5 calculated diagram(s): 300–1788.95 K, x(Ni) 0.77778–0.79866 | 9 | 5 |
| [HF3NI7](#phase-hf-ni-hf3ni7); _phase:hf-ni:hf3ni7_ | Hf3Ni7 · aP20 · P-1 (2) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 1289.3–1529.43 K, x(Ni) 0.7–0.7 | 6 | 4 |
| [HF7NI10](#phase-hf-ni-hf7ni10); _phase:hf-ni:hf7ni10_ | Ni10Zr7 · oC68 · Cmce (64) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 5 of 5 calculated diagram(s): 300–1573.12 K, x(Ni) 0.58824–0.58824 | 9 | 5 |
| [HF8NI21](#phase-hf-ni-hf8ni21); _phase:hf-ni:hf8ni21_ | Hf8Ni21 · aP29 · P-1 (2) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 1448–1579.97 K, x(Ni) 0.72414–0.72414 | 4 | 4 |
| [HF9NI11](#phase-hf-ni-hf9ni11); _phase:hf-ni:hf9ni11_ | Pt11Zr9 · tI40 · I4/m (87) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 300–1616.09 K, x(Ni) 0.55–0.55 | 7 | 4 |
| [HFNI_HT](#phase-hf-ni-hfni); _phase:hf-ni:hfni_ |  | needs_review | stable in 3 of 3 calculated diagram(s): 1423.15–1808.47 K, x(Ni) 0.5–0.5 | 2 | 3 |
| [HFNI_B33](#phase-hf-ni-hfni-b33); _phase:hf-ni:hfni-b33_ | CrB · B33 · oC8 · Cmcm (63) | tier A: standard phase name | stable in 5 of 5 calculated diagram(s): 300–1825.62 K, x(Ni) 0.5–0.5 | 3 | 5 |
| [HFNI3_HT](#phase-hf-ni-hfni3-ht); _phase:hf-ni:hfni3-ht_ | BaPb3 · hR12 · R-3m (166) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 1470.06–1632.16 K, x(Ni) 0.75–0.75 | 0 | 4 |
| [HFNI3_RT](#phase-hf-ni-hfni3-rt); _phase:hf-ni:hfni3-rt_ | Pd2RhTa · hP40 · P6_3/mmc (194) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 4 of 4 calculated diagram(s): 300–1472.75 K, x(Ni) 0.75–0.75 | 0 | 4 |
| [HFNI5_C15B](#phase-hf-ni-hfni5-c15b); _phase:hf-ni:hfni5-c15b_ | AuBe5 · C15_b · cF24 · F-43m (216) | tier A: standard phase name | stable in 5 of 5 calculated diagram(s): 300–1675.31 K, x(Ni) 0.83333–0.83333 | 8 | 5 |
| [LIQUID](#phase-hf-ni-liquid); _phase:hf-ni:liquid_ | liquid | liquid | stable in 5 of 5 calculated diagram(s): 1410.87–4000 K, x(Ni) 0–1 | 9 | 5 |

## BCC_A2 (Hf–Ni)

- Id: `phase:hf-ni:bcc-a2`; status `assigned`
- Structure: W · A2 · cI2 · Im-3m (229); type `st:a2-w-ci2`; tier A: standard phase name; confidence high
- Stability: stable in 5 of 5 calculated diagram(s): 1427.62–2539.46 K, x(Ni) 0–0.08438
- Literature: 6 values (6 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:bcc-a2)

Names (10): _corpus: _corpus:phase:hf-ni:bcc-a2, corpus:phase:hf-ni:a2-bcc  
_paper: _paper:10.1016/j.calphad.2011.10.003:bcc-Hf, paper:10.1016/j.tca.2018.08.011:bcc-A2  
_tdb: _tdb:HfNi-01Wan-LB.tdb:BCC_A2, tdb:HfNi-08Zha.tdb:BCC_A2, tdb:HfNi-11Cac.tdb:BCC_A2, tdb:HfNi-18Ros.tdb:A2_BCC, tdb:HfNi-18Ros.tdb:BCC_A2, tdb:HfNi-75Kau.tdb:BCC_A2  


### TDB models of BCC_A2 (6): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): BCC_A2, type code %B, sha256 `1e74d0865d1d85b9…`

~~~~text
36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : HF% NI : VA : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): BCC_A2, type code %B, sha256 `d63ce8bd980b5800…`

~~~~text
34: PHASE BCC_A2 %B 2 1 3 !
35: CONST BCC_A2 : HF% NI : VA : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): BCC_A2, type code %B, sha256 `e6cae16c4cced3c0…`

~~~~text
35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : HF% NI : VA : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): A2_BCC, type code %B, sha256 `24edb198273bee61…`

~~~~text
53: PHASE A2_BCC %B 2 1 3 !
54: CONST A2_BCC : HF% NI : VA : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): BCC_A2, type code %B, sha256 `24edb198273bee61…`

~~~~text
48: PHASE BCC_A2 %B 2 1 3 !
49: CONST BCC_A2 : HF% NI : VA : !
~~~~

[HfNi-75Kau.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb): BCC_A2, type code %B, sha256 `899efd418770558a…`

~~~~text
40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : HF% NI : VA : !
~~~~

Example references (5 of 5; assessments first): 

- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) L. Kaufman, H. Nesor, Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems, Canadian Metallurgical Quarterly 14, 221-232 (1975).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_

## B2_BCC (Hf–Ni)

- Id: `phase:hf-ni:bcc-b2`; status `assigned`
- Structure: CsCl · B2 · cP2 · Pm-3m (221); type `st:b2-cscl-cp2`; tier A: standard phase name; confidence high
- Caveat: HfNi-18Ros.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
- Caveat: partitioned order/disorder model in HfNi-18Ros.tdb also describes the disordered state
- Stability: stable in 1 of 1 calculated diagram(s): 1350.9–2516.97 K, x(Ni) 0–0.50634
- Literature: 5 values (5 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:bcc-b2)

Names (6): _corpus: _corpus:phase:hf-ni:bcc-b2, corpus:phase:hf-ni:b2-bcc  
_paper: _paper:10.1016/j.tca.2018.08.011:B2, paper:10.1016/j.tca.2018.08.011:NiHf(B2), paper:10.1016/j.tca.2018.08.011:bcc-B2  
_tdb: _tdb:HfNi-18Ros.tdb:B2_BCC  


### TDB models of B2_BCC (1): PHASE and CONSTITUENT statements as written

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): B2_BCC, type code %BO, sha256 `24edb198273bee61…`

~~~~text
58: PHASE B2_BCC %BO 3 0.5 0.5 3 !
59: CONST B2_BCC : HF% NI : HF NI% : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_

## FCC_A1 (Hf–Ni)

- Id: `phase:hf-ni:fcc-a1`; status `assigned`
- Structure: Cu · A1 · cF4 · Fm-3m (225); type `st:a1-cu-cf4`; tier A: standard phase name; confidence high
- Stability: stable in 5 of 5 calculated diagram(s): 300–3999.62 K, x(Ni) 0.98196–1
- Literature: 7 values (7 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:fcc-a1)

Names (11): _corpus: _corpus:phase:hf-ni:fcc-a1, corpus:phase:hf-ni:a1-fcc  
_paper: _paper:10.1016/j.calphad.2011.10.003:Ni, paper:10.1016/j.tca.2018.08.011:Hf(fcc-A1), paper:10.1016/j.tca.2018.08.011:fcc-A1  
_tdb: _tdb:HfNi-01Wan-LB.tdb:FCC_A1, tdb:HfNi-08Zha.tdb:FCC_A1, tdb:HfNi-11Cac.tdb:FCC_A1, tdb:HfNi-18Ros.tdb:A1_FCC, tdb:HfNi-18Ros.tdb:FCC_A1, tdb:HfNi-75Kau.tdb:FCC_A1  


### TDB models of FCC_A1 (6): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): FCC_A1, type code %A, sha256 `1e74d0865d1d85b9…`

~~~~text
31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : HF NI% : VA : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): FCC_A1, type code %A, sha256 `d63ce8bd980b5800…`

~~~~text
29: PHASE FCC_A1 %A 2 1 1 !
30: CONST FCC_A1 : HF NI% : VA : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): FCC_A1, type code %A, sha256 `e6cae16c4cced3c0…`

~~~~text
30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : HF NI% : VA : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): A1_FCC, type code %A, sha256 `24edb198273bee61…`

~~~~text
38: PHASE A1_FCC %A 2 1 1 !
39: CONST A1_FCC : HF NI% : VA : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): FCC_A1, type code %A, sha256 `24edb198273bee61…`

~~~~text
33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : HF NI% : VA : !
~~~~

[HfNi-75Kau.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb): FCC_A1, type code %A, sha256 `899efd418770558a…`

~~~~text
35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : HF NI% : VA : !
~~~~

Example references (5 of 5; assessments first): 

- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) L. Kaufman, H. Nesor, Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems, Canadian Metallurgical Quarterly 14, 221-232 (1975).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_

## L12_FCC (Hf–Ni)

- Id: `phase:hf-ni:fcc-l12`; status `assigned`
- Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type `st:l1-2-aucu3-cp4`; tier A: standard phase name; confidence high
- Caveat: HfNi-18Ros.tdb: ordered phase with disordered part A1_FCC (order/disorder model)
- Caveat: partitioned order/disorder model in HfNi-18Ros.tdb also describes the disordered state
- Stability: stable in 1 of 1 calculated diagram(s): 1160–1700 K, x(Ni) 0.99–0.99
- Literature: 5 values (5 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:fcc-l12)

Names (6): _corpus: _corpus:phase:hf-ni:fcc-l12, corpus:phase:hf-ni:l12-fcc  
_paper: _paper:10.1016/j.tca.2018.08.011:L12, paper:10.1016/j.tca.2018.08.011:Ni3Hf(L12), paper:10.1016/j.tca.2018.08.011:NiHf3(L12)  
_tdb: _tdb:HfNi-18Ros.tdb:L12_FCC  


### TDB models of L12_FCC (1): PHASE and CONSTITUENT statements as written

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): L12_FCC, type code %AY, sha256 `24edb198273bee61…`

~~~~text
43: PHASE L12_FCC %AY 3 0.75 0.25 1 !
44: CONST L12_FCC : HF NI% : HF% NI : VA :  !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_

## HCP_A3 (Hf–Ni)

- Id: `phase:hf-ni:hcp-a3`; status `assigned`
- Structure: Mg · A3 · hP2 · P6_3/mmc (194); type `st:a3-mg-hp2`; tier A: standard phase name; confidence high
- Stability: stable in 5 of 5 calculated diagram(s): 300–2016.68 K, x(Ni) 0–0.0133
- Literature: 5 values (5 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hcp-a3)

Names (8): _corpus: _corpus:phase:hf-ni:hcp-a3  
_paper: _paper:10.1016/j.calphad.2011.10.003:hcp-Hf, paper:10.1016/j.tca.2018.08.011:Hf(hcp-A3)  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HCP_A3, tdb:HfNi-08Zha.tdb:HCP_A3, tdb:HfNi-11Cac.tdb:HCP_A3, tdb:HfNi-18Ros.tdb:HCP_A3, tdb:HfNi-75Kau.tdb:HCP_A3  


### TDB models of HCP_A3 (5): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HCP_A3, type code %A, sha256 `1e74d0865d1d85b9…`

~~~~text
41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : HF% NI : VA : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HCP_A3, type code %A, sha256 `d63ce8bd980b5800…`

~~~~text
39: PHASE HCP_A3 %A 2 1 0.5 !
40: CONST HCP_A3 : HF% NI : VA : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HCP_A3, type code %A, sha256 `e6cae16c4cced3c0…`

~~~~text
40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : HF% NI : VA : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HCP_A3, type code %A, sha256 `24edb198273bee61…`

~~~~text
63: PHASE HCP_A3 %A 2 1 0.5 !
64: CONST HCP_A3 : HF% NI : VA : !
~~~~

[HfNi-75Kau.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb): HCP_A3, type code %A, sha256 `899efd418770558a…`

~~~~text
45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : HF% NI : VA : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) L. Kaufman, H. Nesor, Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems, Canadian Metallurgical Quarterly 14, 221-232 (1975).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_
- [doi:10.1016/j.commatsci.2016.08.042](https://doi.org/10.1016/j.commatsci.2016.08.042) A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).  
_cited as the source of values for this phase_

## HF2NI_C16 (Hf–Ni)

- Id: `phase:hf-ni:hf2ni-c16`; status `assigned`
- Structure: Al2Cu · C16 · tI12 · I4/mcm (140); type `st:c16-al2cu-ti12`; tier A: standard phase name; confidence high
- Stability: stable in 5 of 5 calculated diagram(s): 300–1562.55 K, x(Ni) 0.31648–0.33333
- Literature: 3 values (3 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hf2ni-c16)

Names (7): _corpus: _corpus:phase:hf-ni:hf2ni-c16  
_paper: _paper:10.1016/j.calphad.2011.10.003:Hf2Ni  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HF2NI_C16, tdb:HfNi-08Zha.tdb:HF2NI_C16, tdb:HfNi-11Cac.tdb:HF2NI_C16, tdb:HfNi-18Ros.tdb:HF2NI_C16, tdb:HfNi-75Kau.tdb:HF2NI_C16  


### TDB models of HF2NI_C16 (5): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HF2NI_C16, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
46: PHASE HF2NI_C16 % 2 2 1 !
47: CONST HF2NI_C16 : HF : NI VA : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HF2NI_C16, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
44: PHASE HF2NI_C16 % 2 2 1 !
45: CONST HF2NI_C16 : HF : NI VA : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HF2NI_C16, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
45: PHASE HF2NI_C16 % 2 2 1 !
46: CONST HF2NI_C16 : HF : NI VA : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HF2NI_C16, type code %, sha256 `24edb198273bee61…`

~~~~text
68: PHASE HF2NI_C16 % 2 2 1 !
69: CONST HF2NI_C16 : HF : NI VA : !
~~~~

[HfNi-75Kau.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb): HF2NI_C16, type code %, sha256 `899efd418770558a…`

~~~~text
50: PHASE HF2NI_C16 % 2 2 1 !
51: CONST HF2NI_C16 : HF : NI : !
~~~~

Example references (5 of 5; assessments first): 

- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase_
- [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) L. Kaufman, H. Nesor, Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems, Canadian Metallurgical Quarterly 14, 221-232 (1975).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_

## HF2NI5 (Hf–Ni)

- Id: `phase:hf-ni:hf2ni5`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token
- Candidate (tdb_comment): Hf8Ni21 · aP29 · P-1 — HfNi-75Kau.tdb: 'Prototype Hf8Ni21 (aP29, P-1)'
- Stoichiometry: Hf 0.2857, Ni 0.7143
- Stability: stable in 1 of 1 calculated diagram(s): 300–1612.16 K, x(Ni) 0.71429–0.71429
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hf2ni5)

Names (2): _corpus: _corpus:phase:hf-ni:hf2ni5  
_tdb: _tdb:HfNi-75Kau.tdb:HF2NI5  


### TDB models of HF2NI5 (1): PHASE and CONSTITUENT statements as written

[HfNi-75Kau.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb): HF2NI5, type code %, sha256 `899efd418770558a…`

~~~~text
65: PHASE HF2NI5 % 2 2 5 !
66: CONST HF2NI5 : HF : NI : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) L. Kaufman, H. Nesor, Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems, Canadian Metallurgical Quarterly 14, 221-232 (1975).  
_assessment that models this phase_

## HF2NI7 (Hf–Ni)

- Id: `phase:hf-ni:hf2ni7`; status `assigned`
- Structure: Ni7Zr2 · mC36 · C2/m (12); type `st:ni7zr2-mc36`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: stable in 5 of 5 calculated diagram(s): 300–1788.95 K, x(Ni) 0.77778–0.79866
- Literature: 9 values (9 accepted) from 3 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hf2ni7)

Names (9): _corpus: _corpus:phase:hf-ni:hf2ni7  
_paper: _paper:10.1016/j.calphad.2011.10.003:Hf2Ni7, paper:10.1016/j.commatsci.2016.08.042:Hf2Ni7, paper:10.1016/j.tca.2018.08.011:Hf2Ni7  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HF2NI7, tdb:HfNi-08Zha.tdb:HF2NI7, tdb:HfNi-11Cac.tdb:HF2NI7, tdb:HfNi-18Ros.tdb:HF2NI7, tdb:HfNi-75Kau.tdb:HF2NI7  


### TDB models of HF2NI7 (5): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HF2NI7, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
91: PHASE HF2NI7 % 2 2 7 !
92: CONST HF2NI7 : HF : NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HF2NI7, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
89: PHASE HF2NI7 % 2 2 7 !
90: CONST HF2NI7 : HF% NI : NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HF2NI7, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
90: PHASE HF2NI7 % 2 2 7 !
91: CONST HF2NI7 : HF : NI : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HF2NI7, type code %, sha256 `24edb198273bee61…`

~~~~text
108: PHASE HF2NI7 % 2 2 7 !
109: CONST HF2NI7 : HF% NI : NI : !
~~~~

[HfNi-75Kau.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb): HF2NI7, type code %, sha256 `899efd418770558a…`

~~~~text
70: PHASE HF2NI7 % 2 2 7 !
71: CONST HF2NI7 : HF : NI : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) L. Kaufman, H. Nesor, Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems, Canadian Metallurgical Quarterly 14, 221-232 (1975).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_
- [doi:10.1016/j.commatsci.2016.08.042](https://doi.org/10.1016/j.commatsci.2016.08.042) A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).  
_reports values for this phase_

## HF3NI7 (Hf–Ni)

- Id: `phase:hf-ni:hf3ni7`; status `assigned`
- Structure: Hf3Ni7 · aP20 · P-1 (2); type `st:hf3ni7-ap20`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Hf 0.3000, Ni 0.7000
- Stability: stable in 4 of 4 calculated diagram(s): 1289.3–1529.43 K, x(Ni) 0.7–0.7
- Literature: 6 values (6 accepted) from 3 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hf3ni7)

Names (8): _corpus: _corpus:phase:hf-ni:hf3ni7  
_paper: _paper:10.1016/j.calphad.2011.10.003:Hf3Ni7, paper:10.1016/j.commatsci.2016.08.042:Hf3Ni7, paper:10.1016/j.tca.2018.08.011:Hf3Ni7  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HF3NI7, tdb:HfNi-08Zha.tdb:HF3NI7, tdb:HfNi-11Cac.tdb:HF3NI7, tdb:HfNi-18Ros.tdb:HF3NI7  


### TDB models of HF3NI7 (4): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HF3NI7, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
71: PHASE HF3NI7 % 2 3 7 !
72: CONST HF3NI7 : HF : NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HF3NI7, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
69: PHASE HF3NI7 % 2 3 7 !
70: CONST HF3NI7 : HF : NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HF3NI7, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
70: PHASE HF3NI7 % 2 3 7 !
71: CONST HF3NI7 : HF : NI : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HF3NI7, type code %, sha256 `24edb198273bee61…`

~~~~text
88: PHASE HF3NI7 % 2 3 7 !
89: CONST HF3NI7 : HF : NI : !
~~~~

Example references (5 of 5; assessments first): 

- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_
- [doi:10.1016/j.commatsci.2016.08.042](https://doi.org/10.1016/j.commatsci.2016.08.042) A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).  
_reports values for this phase_

## HF7NI10 (Hf–Ni)

- Id: `phase:hf-ni:hf7ni10`; status `assigned`
- Structure: Ni10Zr7 · oC68 · Cmce (64); type `st:ni10zr7-oc68`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Hf 0.4118, Ni 0.5882
- Stability: stable in 5 of 5 calculated diagram(s): 300–1573.12 K, x(Ni) 0.58824–0.58824
- Literature: 9 values (9 accepted) from 3 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hf7ni10)

Names (9): _corpus: _corpus:phase:hf-ni:hf7ni10  
_paper: _paper:10.1016/j.calphad.2011.10.003:Hf7Ni10, paper:10.1016/j.commatsci.2016.08.042:Hf7Ni10, paper:10.1016/j.tca.2018.08.011:Hf7Ni10  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HF7NI10, tdb:HfNi-08Zha.tdb:HF7NI10, tdb:HfNi-11Cac.tdb:HF7NI10, tdb:HfNi-18Ros.tdb:HF7NI10, tdb:HfNi-75Kau.tdb:HF7NI10  


### TDB models of HF7NI10 (5): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HF7NI10, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
66: PHASE HF7NI10 % 2 7 10 !
67: CONST HF7NI10 : HF : NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HF7NI10, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
64: PHASE HF7NI10 % 2 7 10 !
65: CONST HF7NI10 : HF : NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HF7NI10, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
65: PHASE HF7NI10 % 2 7 10 !
66: CONST HF7NI10 : HF : NI : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HF7NI10, type code %, sha256 `24edb198273bee61…`

~~~~text
83: PHASE HF7NI10 % 2 7 10 !
84: CONST HF7NI10 : HF : NI : !
~~~~

[HfNi-75Kau.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb): HF7NI10, type code %, sha256 `899efd418770558a…`

~~~~text
60: PHASE HF7NI10 % 2 7 10 !
61: CONST HF7NI10 : HF : NI : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) L. Kaufman, H. Nesor, Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems, Canadian Metallurgical Quarterly 14, 221-232 (1975).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_
- [doi:10.1016/j.commatsci.2016.08.042](https://doi.org/10.1016/j.commatsci.2016.08.042) A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).  
_reports values for this phase_

## HF8NI21 (Hf–Ni)

- Id: `phase:hf-ni:hf8ni21`; status `assigned`
- Structure: Hf8Ni21 · aP29 · P-1 (2); type `st:hf8ni21-ap29`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Hf 0.2759, Ni 0.7241
- Stability: stable in 4 of 4 calculated diagram(s): 1448–1579.97 K, x(Ni) 0.72414–0.72414
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hf8ni21)

Names (6): _corpus: _corpus:phase:hf-ni:hf8ni21  
_paper: _paper:10.1016/j.commatsci.2016.08.042:Hf8Ni21  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HF8NI21, tdb:HfNi-08Zha.tdb:HF8NI21, tdb:HfNi-11Cac.tdb:HF8NI21, tdb:HfNi-18Ros.tdb:HF8NI21  


### TDB models of HF8NI21 (4): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HF8NI21, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
76: PHASE HF8NI21 % 2 8 21 !
77: CONST HF8NI21 : HF : NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HF8NI21, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
74: PHASE HF8NI21 % 2 8 21 !
75: CONST HF8NI21 : HF : NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HF8NI21, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
75: PHASE HF8NI21 % 2 8 21 !
76: CONST HF8NI21 : HF : NI : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HF8NI21, type code %, sha256 `24edb198273bee61…`

~~~~text
93: PHASE HF8NI21 % 2 8 21 !
94: CONST HF8NI21 : HF : NI : !
~~~~

Example references (5 of 5; assessments first): 

- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_
- [doi:10.1016/j.commatsci.2016.08.042](https://doi.org/10.1016/j.commatsci.2016.08.042) A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).  
_reports values for this phase_

## HF9NI11 (Hf–Ni)

- Id: `phase:hf-ni:hf9ni11`; status `assigned`
- Structure: Pt11Zr9 · tI40 · I4/m (87); type `st:pt11zr9-ti40`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Hf 0.4500, Ni 0.5500
- Stability: stable in 4 of 4 calculated diagram(s): 300–1616.09 K, x(Ni) 0.55–0.55
- Literature: 7 values (7 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hf9ni11)

Names (7): _corpus: _corpus:phase:hf-ni:hf9ni11  
_paper: _paper:10.1016/j.commatsci.2016.08.042:Hf9Ni11, paper:10.1016/j.tca.2018.08.011:Hf9Ni11  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HF9NI11, tdb:HfNi-08Zha.tdb:HF9NI11, tdb:HfNi-11Cac.tdb:HF9NI11, tdb:HfNi-18Ros.tdb:HF9NI11  


### TDB models of HF9NI11 (4): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HF9NI11, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
61: PHASE HF9NI11 % 2 9 11 !
62: CONST HF9NI11 : HF : NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HF9NI11, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
59: PHASE HF9NI11 % 2 9 11 !
60: CONST HF9NI11 : HF : NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HF9NI11, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
60: PHASE HF9NI11 % 2 9 11 !
61: CONST HF9NI11 : HF : NI : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HF9NI11, type code %, sha256 `24edb198273bee61…`

~~~~text
78: PHASE HF9NI11 % 2 9 11 !
79: CONST HF9NI11 : HF : NI : !
~~~~

Example references (5 of 5; assessments first): 

- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_
- [doi:10.1016/j.commatsci.2016.08.042](https://doi.org/10.1016/j.commatsci.2016.08.042) A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).  
_reports values for this phase_

## HFNI_HT (Hf–Ni)

- Id: `phase:hf-ni:hfni`; status `needs_review`
- No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete
- Candidate (dft_mp): Cmcm (63) — on-hull MP HfNi at x(NI)=0.5000
- Candidate (dft_oqmd): Cmcm (63) — on-hull OQMD Hf1 Ni1 at x(NI)=0.5000
- Candidate (literature_printed): (HfNi) · ? — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (HfNi) — Hallstedt 2025 mmc2 row for HFNI_HT: HfNi (high T)
- Stoichiometry: Hf 0.5000, Ni 0.5000
- Stability: stable in 3 of 3 calculated diagram(s): 1423.15–1808.47 K, x(Ni) 0.5–0.5
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hfni)

Names (6): _corpus: _corpus:phase:hf-ni:hfni, corpus:phase:hf-ni:hfni-ht  
_paper: _paper:10.1016/j.calphad.2011.10.003:β-HfNi  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HFNI_HT, tdb:HfNi-08Zha.tdb:HFNI_HT, tdb:HfNi-11Cac.tdb:HFNI_HT  


### TDB models of HFNI_HT (3): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HFNI_HT, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
56: PHASE HFNI_HT % 2 1 1 !
57: CONST HFNI_HT : HF : NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HFNI_HT, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
54: PHASE HFNI_HT % 2 1 1 !
55: CONST HFNI_HT : HF : NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HFNI_HT, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
55: PHASE HFNI_HT % 2 1 1 !
56: CONST HFNI_HT : HF : NI : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_

## HFNI_B33 (Hf–Ni)

- Id: `phase:hf-ni:hfni-b33`; status `assigned`
- Structure: CrB · B33 · oC8 · Cmcm (63); type `st:b33-crb-oc8`; tier A: standard phase name; confidence high
- Stoichiometry: Hf 0.5000, Ni 0.5000
- Stability: stable in 5 of 5 calculated diagram(s): 300–1825.62 K, x(Ni) 0.5–0.5
- Literature: 3 values (3 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hfni-b33)

Names (7): _corpus: _corpus:phase:hf-ni:hfni-b33  
_paper: _paper:10.1016/j.tca.2018.08.011:NiHf(B33)  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HFNI_B33, tdb:HfNi-08Zha.tdb:HFNI_B33, tdb:HfNi-11Cac.tdb:HFNI_B33, tdb:HfNi-18Ros.tdb:HFNI_B33, tdb:HfNi-75Kau.tdb:HFNI_B33  


### TDB models of HFNI_B33 (5): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HFNI_B33, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
51: PHASE HFNI_B33 % 2 1 1 !
52: CONST HFNI_B33 : HF : NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HFNI_B33, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
49: PHASE HFNI_B33 % 2 1 1 !
50: CONST HFNI_B33 : HF : NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HFNI_B33, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
50: PHASE HFNI_B33 % 2 1 1 !
51: CONST HFNI_B33 : HF : NI : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HFNI_B33, type code %, sha256 `24edb198273bee61…`

~~~~text
73: PHASE HFNI_B33 % 2 1 1 !
74: CONST HFNI_B33 : HF : NI : !
~~~~

[HfNi-75Kau.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb): HFNI_B33, type code %, sha256 `899efd418770558a…`

~~~~text
55: PHASE HFNI_B33 % 2 1 1 !
56: CONST HFNI_B33 : HF : NI : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) L. Kaufman, H. Nesor, Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems, Canadian Metallurgical Quarterly 14, 221-232 (1975).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_
- [doi:10.1016/j.commatsci.2016.08.042](https://doi.org/10.1016/j.commatsci.2016.08.042) A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).  
_cited as the source of values for this phase_

## HFNI3_HT (Hf–Ni)

- Id: `phase:hf-ni:hfni3-ht`; status `assigned`
- Structure: BaPb3 · hR12 · R-3m (166); type `st:bapb3-hr12`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_structure_token, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Hf 0.2500, Ni 0.7500
- Stability: stable in 4 of 4 calculated diagram(s): 1470.06–1632.16 K, x(Ni) 0.75–0.75
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hfni3-ht)

Names (5): _corpus: _corpus:phase:hf-ni:hfni3-ht  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HFNI3_HT, tdb:HfNi-08Zha.tdb:HFNI3_HT, tdb:HfNi-11Cac.tdb:HFNI3_HT, tdb:HfNi-18Ros.tdb:HFNI3_HT  


### TDB models of HFNI3_HT (4): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HFNI3_HT, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
86: PHASE HFNI3_HT % 2 1 3 !
87: CONST HFNI3_HT : HF : NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HFNI3_HT, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
84: PHASE HFNI3_HT % 2 1 3 !
85: CONST HFNI3_HT : HF : NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HFNI3_HT, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
85: PHASE HFNI3_HT % 2 1 3 !
86: CONST HFNI3_HT : HF : NI : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HFNI3_HT, type code %, sha256 `24edb198273bee61…`

~~~~text
103: PHASE HFNI3_HT % 2 1 3 !
104: CONST HFNI3_HT : HF : NI : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_

## HFNI3_RT (Hf–Ni)

- Id: `phase:hf-ni:hfni3-rt`; status `assigned`
- Structure: Pd2RhTa · hP40 · P6_3/mmc (194); type `st:pd2rhta-hp40`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_structure_token, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Hf 0.2500, Ni 0.7500
- Stability: stable in 4 of 4 calculated diagram(s): 300–1472.75 K, x(Ni) 0.75–0.75
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hfni3-rt)

Names (5): _corpus: _corpus:phase:hf-ni:hfni3-rt  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HFNI3_RT, tdb:HfNi-08Zha.tdb:HFNI3_RT, tdb:HfNi-11Cac.tdb:HFNI3_RT, tdb:HfNi-18Ros.tdb:HFNI3_RT  


### TDB models of HFNI3_RT (4): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HFNI3_RT, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
81: PHASE HFNI3_RT % 2 1 3 !
82: CONST HFNI3_RT : HF : NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HFNI3_RT, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
79: PHASE HFNI3_RT % 2 1 3 !
80: CONST HFNI3_RT : HF : NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HFNI3_RT, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
80: PHASE HFNI3_RT % 2 1 3 !
81: CONST HFNI3_RT : HF : NI : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HFNI3_RT, type code %, sha256 `24edb198273bee61…`

~~~~text
98: PHASE HFNI3_RT % 2 1 3 !
99: CONST HFNI3_RT : HF : NI : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_

## HFNI5_C15B (Hf–Ni)

- Id: `phase:hf-ni:hfni5-c15b`; status `assigned`
- Structure: AuBe5 · C15_b · cF24 · F-43m (216); type `st:c15-b-aube5-cf24`; tier A: standard phase name; confidence high
- Stoichiometry: Hf 0.1667, Ni 0.8333
- Stability: stable in 5 of 5 calculated diagram(s): 300–1675.31 K, x(Ni) 0.83333–0.83333
- Literature: 8 values (8 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:hfni5-c15b)

Names (9): _corpus: _corpus:phase:hf-ni:hfni5-c15b  
_paper: _paper:10.1016/j.calphad.2011.10.003:HfNi5, paper:10.1016/j.tca.2018.08.011:HfNi5, paper:10.1016/j.tca.2018.08.011:Ni5Hf(C15b)  
_tdb: _tdb:HfNi-01Wan-LB.tdb:HFNI5_C15B, tdb:HfNi-08Zha.tdb:HFNI5_C15B, tdb:HfNi-11Cac.tdb:HFNI5_C15B, tdb:HfNi-18Ros.tdb:HFNI5_C15B, tdb:HfNi-75Kau.tdb:HFNI5_C15B  


### TDB models of HFNI5_C15B (5): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): HFNI5_C15B, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
96: PHASE HFNI5_C15B % 2 1 5 !
97: CONST HFNI5_C15B : HF : NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): HFNI5_C15B, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
94: PHASE HFNI5_C15B % 2 1 5 !
95: CONST HFNI5_C15B : HF : NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): HFNI5_C15B, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
95: PHASE HFNI5_C15B % 2 1 5 !
96: CONST HFNI5_C15B : HF : NI : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): HFNI5_C15B, type code %, sha256 `24edb198273bee61…`

~~~~text
113: PHASE HFNI5_C15B % 2 1 5 !
114: CONST HFNI5_C15B : HF : NI : !
~~~~

[HfNi-75Kau.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb): HFNI5_C15B, type code %, sha256 `899efd418770558a…`

~~~~text
75: PHASE HFNI5_C15B % 2 1 5 !
76: CONST HFNI5_C15B : HF : NI : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) L. Kaufman, H. Nesor, Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems, Canadian Metallurgical Quarterly 14, 221-232 (1975).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_
- [doi:10.1016/j.commatsci.2016.08.042](https://doi.org/10.1016/j.commatsci.2016.08.042) A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).  
_cited as the source of values for this phase_

## LIQUID (Hf–Ni)

- Id: `phase:hf-ni:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 5 of 5 calculated diagram(s): 1410.87–4000 K, x(Ni) 0–1
- Literature: 9 values (9 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:hf-ni:liquid)

Names (8): _corpus: _corpus:phase:hf-ni:liquid  
_paper: _paper:10.1016/j.calphad.2011.10.003:L, paper:10.1016/j.calphad.2011.10.003:liquid  
_tdb: _tdb:HfNi-01Wan-LB.tdb:LIQUID, tdb:HfNi-08Zha.tdb:LIQUID, tdb:HfNi-11Cac.tdb:LIQUID, tdb:HfNi-18Ros.tdb:LIQUID, tdb:HfNi-75Kau.tdb:LIQUID  


### TDB models of LIQUID (5): PHASE and CONSTITUENT statements as written

[HfNi-01Wan-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb): LIQUID, type code %, sha256 `1e74d0865d1d85b9…`

~~~~text
26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : HF NI : !
~~~~

[HfNi-08Zha.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb): LIQUID, type code %, sha256 `d63ce8bd980b5800…`

~~~~text
24: PHASE LIQUID:L % 1 1 !
25: CONST LIQUID:L : HF NI : !
~~~~

[HfNi-11Cac.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb): LIQUID, type code %, sha256 `e6cae16c4cced3c0…`

~~~~text
25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : HF NI : !
~~~~

[HfNi-18Ros.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb): LIQUID, type code %, sha256 `24edb198273bee61…`

~~~~text
28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : HF NI : !
~~~~

[HfNi-75Kau.tdb](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb): LIQUID, type code %, sha256 `899efd418770558a…`

~~~~text
30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : HF NI : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) G. Cacciamani, P. Riani, F. Valenza, Equilibrium between MB2 (M=Ti,Zr,Hf) UHTC and Ni: A thermodynamic database for the B–Hf–Ni–Ti–Zr system, Calphad 35, 601-619 (2011).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao et al., Thermodynamic modeling and experimental investigation of the Ni-rich corner of the Ni–Al–Hf system, Intermetallics 16, 139-147 (2008).  
_assessment that models this phase_
- [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall et al., A first-principles based description of the Hf-Ni system supported by high-temperature synchrotron experiments, Thermochimica Acta 668, 142-151 (2018).  
_assessment that models this phase_
- [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) L. Kaufman, H. Nesor, Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems, Canadian Metallurgical Quarterly 14, 221-232 (1975).  
_assessment that models this phase_
- [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001).  
_assessment that models this phase_
- [doi:10.1016/0925-8388(93)90281-q](https://doi.org/10.1016/0925-8388%2893%2990281-q) V.N. Yeremenko, E.L. Semenova, L.A. Tretyachenko, V.M. Petyukh, Constitution of the Hf-Ni system up to 50 at.% Ni, Journal of Alloys and Compounds 191, 117-119 (1993).  
_cited as the source of values for this phase_

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735970
- R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23736065

Also cite B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work).

Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

```bibtex
@misc{orchid_phase_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).