# Ho–Ni phases > Ho–Ni system: 13 phases (tier A 7, tier B 1, tier C 4, liquid 1); 12 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/HO-NI.html · Markdown: https://data.orchid-project.org/phases/pages/HO-NI.md 13 phases (tier A 7, tier B 1, tier C 4, liquid 1); 12 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=HO-NI) · [full JSON](https://data.orchid-project.org/phases/systems/HO-NI.json) · [Ho–Ni system page](https://data.orchid-project.org/systems/HO-NI.html) · [Markdown](https://data.orchid-project.org/phases/pages/HO-NI.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the Ho–Ni system (13) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [BCC_A2](#phase-ho-ni-bcc-a2); _phase:ho-ni:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | not stable in 2 calculated diagram(s) | 1 | 2 | | [FCC_A1](#phase-ho-ni-fcc-a1); _phase:ho-ni:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–2499.72 K, x(Ni) 0.99998–1 | 7 | 2 | | [HCP_A3](#phase-ho-ni-hcp-a3); _phase:ho-ni:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1782.44 K, x(Ni) 0–8e-05 | 10 | 2 | | [HO2NI17](#phase-ho-ni-ho2ni17); _phase:ho-ni:ho2ni17_ | Ni17Th2 · hP38 · P6_3/mmc (194) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–1561.5 K, x(Ni) 0.89474–0.89474 | 20 | 2 | | [HO2NI7](#phase-ho-ni-ho2ni7); _phase:ho-ni:ho2ni7_ | Co7Gd2 · hR18 · R-3m (166) | tier B: DFT-supported (unique MP + OQMD match) | stable in 2 of 2 calculated diagram(s): 300–1592.57 K, x(Ni) 0.77778–0.77778 | 19 | 2 | | [HO3NI_D011](#phase-ho-ni-ho3ni-d011); _phase:ho-ni:ho3ni-d011_ | Fe3C · D0_11 · oP16 · Pnma (62) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1027.44 K, x(Ni) 0.25–0.25 | 18 | 2 | | [HO3NI2_HT](#phase-ho-ni-ho3ni2-ht); _phase:ho-ni:ho3ni2-ht_ | Er3Ni2 · hR15 · R-3 (148) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 1030.24–1254.92 K, x(Ni) 0.4–0.4 | 15 | 2 | | [HO3NI2_LT](#phase-ho-ni-ho3ni2-lt); _phase:ho-ni:ho3ni2-lt_ | Dy3Ni2 · mC20 · C2/m (12) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–1031 K, x(Ni) 0.4–0.4 | 20 | 2 | | [HONI_B27](#phase-ho-ni-honi-b27); _phase:ho-ni:honi-b27_ | FeB · B27 · oP8 · Pnma (62) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1341.68 K, x(Ni) 0.5–0.5 | 27 | 2 | | [HONI2_C15](#phase-ho-ni-honi2-c15); _phase:ho-ni:honi2-c15_ | Cu2Mg · C15 · cF24 · Fd-3m (227) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1469.69 K, x(Ni) 0.65686–0.66667 | 18 | 2 | | [HONI3](#phase-ho-ni-honi3); _phase:ho-ni:honi3_ | Ni3Pu · hR12 · R-3m (166) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 2 of 2 calculated diagram(s): 300–1560.42 K, x(Ni) 0.75–0.75 | 19 | 2 | | [HONI5_D2D](#phase-ho-ni-honi5-d2d); _phase:ho-ni:honi5-d2d_ | CaCu5 · D2_d · hP6 · P6/mmm (191) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1645.82 K, x(Ni) 0.83333–0.83333 | 24 | 2 | | [LIQUID](#phase-ho-ni-liquid); _phase:ho-ni:liquid_ | liquid | liquid | stable in 2 of 2 calculated diagram(s): 1002.77–2500 K, x(Ni) 0–1 | 73 | 2 | ## BCC_A2 (Ho–Ni) - Id: `phase:ho-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: not stable in 2 calculated diagram(s) - Literature: 1 values (1 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:bcc-a2) Names (4): _corpus: _corpus:phase:ho-ni:bcc-a2 _paper: _paper:10.1007/s10853-022-08039-1:bcc(Ho) _tdb: _tdb:HoNi-15Kar.tdb:BCC_A2, tdb:HoNi-23Ye.tdb:BCC_A2 ### TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): BCC_A2, type code %B, sha256 `177f346c93bb8894…` ~~~~text 37: PHASE BCC_A2 %B 2 1 3 ! 38: CONST BCC_A2 : HO NI : VA : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): BCC_A2, type code %B, sha256 `56caf76fef5f3fb0…` ~~~~text 35: PHASE BCC_A2 %B 2 1 3 ! 36: CONST BCC_A2 : HO NI : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase_ ## FCC_A1 (Ho–Ni) - Id: `phase:ho-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 2 of 2 calculated diagram(s): 300–2499.72 K, x(Ni) 0.99998–1 - Literature: 7 values (7 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:fcc-a1) Names (6): _corpus: _corpus:phase:ho-ni:fcc-a1 _paper: _paper:10.1007/s10853-022-08039-1:fcc(Ni), paper:10.1007/s10973-014-4189-1:(Ni), paper:10.1007/s10973-014-4189-1:fcc_A1 _tdb: _tdb:HoNi-15Kar.tdb:FCC_A1, tdb:HoNi-23Ye.tdb:FCC_A1 ### TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): FCC_A1, type code %A, sha256 `177f346c93bb8894…` ~~~~text 32: PHASE FCC_A1 %A 2 1 1 ! 33: CONST FCC_A1 : HO NI% : VA : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): FCC_A1, type code %A, sha256 `56caf76fef5f3fb0…` ~~~~text 30: PHASE FCC_A1 %A 2 1 1 ! 31: CONST FCC_A1 : HO NI% : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ ## HCP_A3 (Ho–Ni) - Id: `phase:ho-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 2 of 2 calculated diagram(s): 300–1782.44 K, x(Ni) 0–8e-05 - Literature: 10 values (10 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:hcp-a3) Names (6): _corpus: _corpus:phase:ho-ni:hcp-a3 _paper: _paper:10.1007/s10853-022-08039-1:hcp(Ho), paper:10.1007/s10973-014-4189-1:(Ho), paper:10.1007/s10973-014-4189-1:Ho _tdb: _tdb:HoNi-15Kar.tdb:HCP_A3, tdb:HoNi-23Ye.tdb:HCP_A3 ### TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): HCP_A3, type code %, sha256 `177f346c93bb8894…` ~~~~text 42: PHASE HCP_A3 % 2 1 0.5 ! 43: CONST HCP_A3 : HO% NI : VA : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): HCP_A3, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 40: PHASE HCP_A3 % 2 1 0.5 ! 41: CONST HCP_A3 : HO% NI : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ ## HO2NI17 (Ho–Ni) - Id: `phase:ho-ni:ho2ni17`; status `assigned` - Structure: Ni17Th2 · hP38 · P6_3/mmc (194); type `st:ni17th2-hp38`; 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: Ho 0.1053, Ni 0.8947 - Stability: stable in 2 of 2 calculated diagram(s): 300–1561.5 K, x(Ni) 0.89474–0.89474 - Literature: 20 values (20 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:ho2ni17) Names (6): _corpus: _corpus:phase:ho-ni:ho2ni17 _paper: _paper:10.1007/s10853-022-08039-1:Ho2Ni17, paper:10.1007/s10973-014-4189-1:Ho17Ni2, paper:10.1007/s10973-014-4189-1:Ho2Ni17 _tdb: _tdb:HoNi-15Kar.tdb:HO2NI17, tdb:HoNi-23Ye.tdb:HO2NI17 ### TDB models of HO2NI17 (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): HO2NI17, type code %, sha256 `177f346c93bb8894…` ~~~~text 87: PHASE HO2NI17 % 2 2 17 ! 88: CONST HO2NI17 : HO : NI : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): HO2NI17, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 85: PHASE HO2NI17 % 2 2 17 ! 86: CONST HO2NI17 : HO : NI : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/j.intermet.2005.03.002](https://doi.org/10.1016/j.intermet.2005.03.002) D. Gozzi, M. Iervolino, Thermodynamics of Ni richest intermetallics along the rare-earth series, Intermetallics 13, 1172-1183 (2005). _cited as the source of values for this phase_ ## HO2NI7 (Ho–Ni) - Id: `phase:ho-ni:ho2ni7`; status `assigned` - Structure: Co7Gd2 · hR18 · R-3m (166); type `st:co7gd2-hr18`; tier B: DFT-supported (unique MP + OQMD match); confidence high - Stoichiometry: Ho 0.2222, Ni 0.7778 - Stability: stable in 2 of 2 calculated diagram(s): 300–1592.57 K, x(Ni) 0.77778–0.77778 - Literature: 19 values (19 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:ho2ni7) Names (8): _corpus: _corpus:phase:ho-ni:ho2ni7 _mp: _mp:mp-aaacpsuu _oqmd: _oqmd:oqmd-1483994 _paper: _paper:10.1007/s10853-022-08039-1:Ho2Ni7, paper:10.1007/s10973-014-4189-1:Ho2Ni7, paper:10.1007/s10973-014-4189-1:Ho7Ni2 _tdb: _tdb:HoNi-15Kar.tdb:HO2NI7, tdb:HoNi-23Ye.tdb:HO2NI7 ### TDB models of HO2NI7 (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): HO2NI7, type code %, sha256 `177f346c93bb8894…` ~~~~text 77: PHASE HO2NI7 % 2 2 7 ! 78: CONST HO2NI7 : HO : NI : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): HO2NI7, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 75: PHASE HO2NI7 % 2 2 7 ! 76: CONST HO2NI7 : HO : NI : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ ## HO3NI_D011 (Ho–Ni) - Id: `phase:ho-ni:ho3ni-d011`; status `assigned` - Structure: Fe3C · D0_11 · oP16 · Pnma (62); type `st:d0-11-fe3c-op16`; tier A: standard phase name; confidence high - Caveat: DFT agrees: on-hull mp-aaacprea and oqmd-30550, space group 62 - Stoichiometry: Ho 0.7500, Ni 0.2500 - Stability: stable in 2 of 2 calculated diagram(s): 300–1027.44 K, x(Ni) 0.25–0.25 - Literature: 18 values (18 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:ho3ni-d011) Names (7): _corpus: _corpus:phase:ho-ni:ho3ni-d011 _mp: _mp:mp-aaacprea _oqmd: _oqmd:oqmd-30550 _paper: _paper:10.1007/s10853-022-08039-1:Ho3Ni, paper:10.1007/s10973-014-4189-1:Ho3Ni _tdb: _tdb:HoNi-15Kar.tdb:HO3NI_D011, tdb:HoNi-23Ye.tdb:HO3NI_D011 ### TDB models of HO3NI_D011 (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): HO3NI_D011, type code %, sha256 `177f346c93bb8894…` ~~~~text 47: PHASE HO3NI_D011 % 2 3 1 ! 48: CONST HO3NI_D011 : HO : NI : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): HO3NI_D011, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 45: PHASE HO3NI_D011 % 2 3 1 ! 46: CONST HO3NI_D011 : HO : NI : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ ## HO3NI2_HT (Ho–Ni) - Id: `phase:ho-ni:ho3ni2-ht`; status `assigned` - Structure: Er3Ni2 · hR15 · R-3 (148); type `st:er3ni2-hr15`; 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: Ho 0.6000, Ni 0.4000 - Stability: stable in 2 of 2 calculated diagram(s): 1030.24–1254.92 K, x(Ni) 0.4–0.4 - Literature: 15 values (15 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:ho3ni2-ht) Names (5): _corpus: _corpus:phase:ho-ni:ho3ni2-ht _paper: _paper:10.1007/s10853-022-08039-1:Ho3Ni2_HT, paper:10.1007/s10973-014-4189-1:Ho3Ni2_HT _tdb: _tdb:HoNi-15Kar.tdb:HO3NI2_HT, tdb:HoNi-23Ye.tdb:HO3NI2_HT ### TDB models of HO3NI2_HT (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): HO3NI2_HT, type code %, sha256 `177f346c93bb8894…` ~~~~text 57: PHASE HO3NI2_HT % 2 3 2 ! 58: CONST HO3NI2_HT : HO : NI : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): HO3NI2_HT, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 55: PHASE HO3NI2_HT % 2 3 2 ! 56: CONST HO3NI2_HT : HO : NI : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ ## HO3NI2_LT (Ho–Ni) - Id: `phase:ho-ni:ho3ni2-lt`; status `assigned` - Structure: Dy3Ni2 · mC20 · C2/m (12); type `st:dy3ni2-mc20`; 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: Ho 0.6000, Ni 0.4000 - Stability: stable in 2 of 2 calculated diagram(s): 300–1031 K, x(Ni) 0.4–0.4 - Literature: 20 values (20 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:ho3ni2-lt) Names (5): _corpus: _corpus:phase:ho-ni:ho3ni2-lt _paper: _paper:10.1007/s10853-022-08039-1:Ho3Ni2_LT, paper:10.1007/s10973-014-4189-1:Ho3Ni2_LT _tdb: _tdb:HoNi-15Kar.tdb:HO3NI2_LT, tdb:HoNi-23Ye.tdb:HO3NI2_LT ### TDB models of HO3NI2_LT (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): HO3NI2_LT, type code %, sha256 `177f346c93bb8894…` ~~~~text 52: PHASE HO3NI2_LT % 2 3 2 ! 53: CONST HO3NI2_LT : HO : NI : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): HO3NI2_LT, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 50: PHASE HO3NI2_LT % 2 3 2 ! 51: CONST HO3NI2_LT : HO : NI : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ ## HONI_B27 (Ho–Ni) - Id: `phase:ho-ni:honi-b27`; status `assigned` - Structure: FeB · B27 · oP8 · Pnma (62); type `st:b27-feb-op8`; tier A: standard phase name; confidence high - Caveat: DFT agrees: on-hull mp-aaaaarop and oqmd-18379, space group 62 - Stoichiometry: Ho 0.5000, Ni 0.5000 - Stability: stable in 2 of 2 calculated diagram(s): 300–1341.68 K, x(Ni) 0.5–0.5 - Literature: 27 values (27 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:honi-b27) Names (7): _corpus: _corpus:phase:ho-ni:honi-b27 _mp: _mp:mp-aaaaarop _oqmd: _oqmd:oqmd-18379 _paper: _paper:10.1007/s10853-022-08039-1:HoNi, paper:10.1007/s10973-014-4189-1:HoNi _tdb: _tdb:HoNi-15Kar.tdb:HONI_B27, tdb:HoNi-23Ye.tdb:HONI_B27 ### TDB models of HONI_B27 (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): HONI_B27, type code %, sha256 `177f346c93bb8894…` ~~~~text 62: PHASE HONI_B27 % 2 1 1 ! 63: CONST HONI_B27 : HO : NI : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): HONI_B27, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 60: PHASE HONI_B27 % 2 1 1 ! 61: CONST HONI_B27 : HO : NI : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/j.intermet.2005.03.002](https://doi.org/10.1016/j.intermet.2005.03.002) D. Gozzi, M. Iervolino, Thermodynamics of Ni richest intermetallics along the rare-earth series, Intermetallics 13, 1172-1183 (2005). _cited as the source of values for this phase_ - [doi:10.1016/s0925-8388(98)00509-x](https://doi.org/10.1016/s0925-8388%2898%2900509-x) Qiti Guo, Ole J Kleppa, Standard enthalpies of formation of CeNi5 and of RENi (RE=Ce, Pr, Nd, Sm, Gd, Tb, Ho, Tm and Lu), determined by high-temperature direct synthesis calorimetry, Journal of Alloys and Compounds 270, 212-217 (1998). _cited as the source of values for this phase_ ## HONI2_C15 (Ho–Ni) - Id: `phase:ho-ni:honi2-c15`; status `assigned` - Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type `st:c15-cu2mg-cf24`; tier A: standard phase name; confidence high - Stability: stable in 2 of 2 calculated diagram(s): 300–1469.69 K, x(Ni) 0.65686–0.66667 - Literature: 18 values (18 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:honi2-c15) Names (5): _corpus: _corpus:phase:ho-ni:honi2-c15 _paper: _paper:10.1007/s10853-022-08039-1:HoNi2, paper:10.1007/s10973-014-4189-1:HoNi2 _tdb: _tdb:HoNi-15Kar.tdb:HONI2_C15, tdb:HoNi-23Ye.tdb:HONI2_C15 ### TDB models of HONI2_C15 (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): HONI2_C15, type code %, sha256 `177f346c93bb8894…` ~~~~text 67: PHASE HONI2_C15 % 2 1 2 ! 68: CONST HONI2_C15 : HO : HO NI% : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): HONI2_C15, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 65: PHASE HONI2_C15 % 2 1 2 ! 66: CONST HONI2_C15 : HO : HO NI% : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ ## HONI3 (Ho–Ni) - Id: `phase:ho-ni:honi3`; status `assigned` - Structure: Ni3Pu · hR12 · R-3m (166); type `st:ni3pu-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 (dft_space_group_166_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system - Stoichiometry: Ho 0.2500, Ni 0.7500 - Stability: stable in 2 of 2 calculated diagram(s): 300–1560.42 K, x(Ni) 0.75–0.75 - Literature: 19 values (19 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:honi3) Names (5): _corpus: _corpus:phase:ho-ni:honi3 _paper: _paper:10.1007/s10853-022-08039-1:HoNi3, paper:10.1007/s10973-014-4189-1:HoNi3 _tdb: _tdb:HoNi-15Kar.tdb:HONI3, tdb:HoNi-23Ye.tdb:HONI3 ### TDB models of HONI3 (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): HONI3, type code %, sha256 `177f346c93bb8894…` ~~~~text 72: PHASE HONI3 % 2 1 3 ! 73: CONST HONI3 : HO : NI : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): HONI3, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 70: PHASE HONI3 % 2 1 3 ! 71: CONST HONI3 : HO : NI : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ ## HONI5_D2D (Ho–Ni) - Id: `phase:ho-ni:honi5-d2d`; status `assigned` - Structure: CaCu5 · D2_d · hP6 · P6/mmm (191); type `st:d2-d-cacu5-hp6`; tier A: standard phase name; confidence high - Stoichiometry: Ho 0.1667, Ni 0.8333 - Stability: stable in 2 of 2 calculated diagram(s): 300–1645.82 K, x(Ni) 0.83333–0.83333 - Literature: 24 values (24 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:honi5-d2d) Names (5): _corpus: _corpus:phase:ho-ni:honi5-d2d _paper: _paper:10.1007/s10853-022-08039-1:HoNi5, paper:10.1007/s10973-014-4189-1:HoNi5 _tdb: _tdb:HoNi-15Kar.tdb:HONI5_D2D, tdb:HoNi-23Ye.tdb:HONI5_D2D ### TDB models of HONI5_D2D (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): HONI5_D2D, type code %, sha256 `177f346c93bb8894…` ~~~~text 82: PHASE HONI5_D2D % 2 1 5 ! 83: CONST HONI5_D2D : HO : NI : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): HONI5_D2D, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 80: PHASE HONI5_D2D % 2 1 5 ! 81: CONST HONI5_D2D : HO : NI : ! ~~~~ Example references (3 of 3; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/s0925-8388(98)00509-x](https://doi.org/10.1016/s0925-8388%2898%2900509-x) Qiti Guo, Ole J Kleppa, Standard enthalpies of formation of CeNi5 and of RENi (RE=Ce, Pr, Nd, Sm, Gd, Tb, Ho, Tm and Lu), determined by high-temperature direct synthesis calorimetry, Journal of Alloys and Compounds 270, 212-217 (1998). _cited as the source of values for this phase_ ## LIQUID (Ho–Ni) - Id: `phase:ho-ni:liquid`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: stable in 2 of 2 calculated diagram(s): 1002.77–2500 K, x(Ni) 0–1 - Literature: 73 values (73 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ho-ni:liquid) Names (5): _corpus: _corpus:phase:ho-ni:liquid _paper: _paper:10.1007/s10853-022-08039-1:L, paper:10.1007/s10973-014-4189-1:L _tdb: _tdb:HoNi-15Kar.tdb:LIQUID, tdb:HoNi-23Ye.tdb:LIQUID ### TDB models of LIQUID (2): PHASE and CONSTITUENT statements as written [HoNi-15Kar.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-15Kar.tdb): LIQUID, type code %, sha256 `177f346c93bb8894…` ~~~~text 27: PHASE LIQUID:L % 1 1 ! 28: CONST LIQUID:L : HO NI : ! ~~~~ [HoNi-23Ye.tdb](https://orchid-project.org/data/databases/sgte-binary/HoNi-23Ye.tdb): LIQUID, type code %, sha256 `56caf76fef5f3fb0…` ~~~~text 25: PHASE LIQUID:L % 1 1 ! 26: CONST LIQUID:L : HO NI : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1007/s10973-014-4189-1](https://doi.org/10.1007/s10973-014-4189-1) S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015). _assessment that models this phase; reports values for this phase_ - [doi:10.1007/s10853-022-08039-1](https://doi.org/10.1007/s10853-022-08039-1) Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023). _assessment that models this phase; reports 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).