# Hf–Ni system

> Hf–Ni system: 86 accepted literature values (formation 26, crystal structure 23, mixing / partial 15, phase transition 7) and 5 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

86 accepted literature values from 3 paper(s) (experimental 7, model 46, DFT 33); 5 calculated phase diagram(s). 7 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/HF-NI.json) · [CSV](https://data.orchid-project.org/systems/HF-NI.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#HF-NI) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#HF-NI/HfNi-01Wan-LB.json) · [phases (18)](https://data.orchid-project.org/phases/pages/HF-NI.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/HF-NI.html) · [Markdown](https://data.orchid-project.org/systems/HF-NI.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 7 |
| model | 46 |
| DFT | 33 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 5 |
| phase transition | 7 |
| phase equilibrium | 4 |
| formation | 26 |
| mixing / partial | 15 |
| heat capacity / entropy / enthalpy | 6 |
| crystal structure | 23 |

## Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Table: Assessments with a calculated phase diagram

| TDB file | Assessment | SHA-256 | Links |
|---|---|---|---|
| HfNi-01Wan-LB.tdb | T. Wang, Z.P. Jin, J.-C. Zhao, Z. Metallkd., 92, 441-46(2001). [doi:10.3139/ijmr-2001-0088](https://doi.org/10.3139/ijmr-2001-0088) | `1e74d0865d1d85b919be972e1e7765622050495525bb2f52eb5790848bb016c5` | [viewer](https://orchid-project.org/phase-diagrams/#HF-NI/HfNi-01Wan-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/HfNi-01Wan-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/HfNi-01Wan-LB.json) |
| HfNi-08Zha.tdb | C. Zhang, J. Zhu, Y. Yang, H.-B. Cao, F. Zhang, W.-S. Cao, Y.A. Chang, Intermetallics, 16, 139-47(2008). [doi:10.1016/j.intermet.2007.08.009](https://doi.org/10.1016/j.intermet.2007.08.009) | `d63ce8bd980b58002b47d764b13cd7d13fbe173531af7573ddf4b72f344d58a2` | [viewer](https://orchid-project.org/phase-diagrams/#HF-NI/HfNi-08Zha.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/HfNi-08Zha.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/HfNi-08Zha.json) |
| HfNi-11Cac.tdb | G. Cacciamani, P. Riani, F. Valenza, Calphad, 35, 601-19(2011). [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003) | `e6cae16c4cced3c09d16321aedcf8a3b3d3f8340c8feb5fd02784277d82a7f57` | [viewer](https://orchid-project.org/phase-diagrams/#HF-NI/HfNi-11Cac.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/HfNi-11Cac.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/HfNi-11Cac.json) |
| HfNi-18Ros.tdb | A.J. Ross, T. Gheno, P.K. Ray, M.J. Kramer, X.L. Liu, G. Lindwall, B. Zhou, S.L. Shang, B. Gleeson, Z.-K. Liu, Thermochim. Acta, 668, 142-51(2018). [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011) | `24edb198273bee61bfc8b65c445acb22ade2438aab084333b01f5a434c0a9d98` | [viewer](https://orchid-project.org/phase-diagrams/#HF-NI/HfNi-18Ros.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/HfNi-18Ros.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/HfNi-18Ros.json) |
| HfNi-75Kau.tdb | L. Kaufman, H. Nesor, Can. Metall. Quart., 14, 221-32(1975). 2021.01.17: Modified for use with GES6. [doi:10.1179/000844375795050157](https://doi.org/10.1179/000844375795050157) | `899efd418770558a87ab495bfec8ffa01000dbd74c3075af4d3637d268ba22f6` | [viewer](https://orchid-project.org/phase-diagrams/#HF-NI/HfNi-75Kau.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/HfNi-75Kau.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/HfNi-75Kau.json) |

Table: Calculated three-phase invariants (model, mole fraction of the second component)

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| HfNi-01Wan-LB.tdb | 1621.5 | LIQUID (x(Ni) 0.70364) + HFNI3_HT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77778) |
| HfNi-01Wan-LB.tdb | 1621.5 | LIQUID (x(Ni) 0.70355) + HFNI3_HT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77778) |
| HfNi-01Wan-LB.tdb | 1621.5 | LIQUID (x(Ni) 0.70373) + HFNI3_HT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77778) |
| HfNi-01Wan-LB.tdb | 1613.74 | HFNI_HT (x(Ni) 0.5) + HF9NI11 (x(Ni) 0.55) + LIQUID (x(Ni) 0.58233) |
| HfNi-01Wan-LB.tdb | 1613.74 | HFNI_HT (x(Ni) 0.5) + HF9NI11 (x(Ni) 0.55) + LIQUID (x(Ni) 0.58227) |
| HfNi-01Wan-LB.tdb | 1573.01 | LIQUID (x(Ni) 0.68682) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-01Wan-LB.tdb | 1573 | LIQUID (x(Ni) 0.68694) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-01Wan-LB.tdb | 1573 | LIQUID (x(Ni) 0.68688) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-01Wan-LB.tdb | 1561.61 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60542) |
| HfNi-01Wan-LB.tdb | 1561.61 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60545) |
| HfNi-01Wan-LB.tdb | 1561.61 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60533) |
| HfNi-01Wan-LB.tdb | 1521.75 | LIQUID (x(Ni) 0.66926) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-01Wan-LB.tdb | 1521.75 | LIQUID (x(Ni) 0.66922) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-01Wan-LB.tdb | 1521.75 | LIQUID (x(Ni) 0.66918) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-01Wan-LB.tdb | 1516.14 | HF2NI7 (x(Ni) 0.77778) + HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.87822) |
| HfNi-01Wan-LB.tdb | 1516.14 | HF2NI7 (x(Ni) 0.77778) + HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.8782) |
| HfNi-01Wan-LB.tdb | 1472.75 | HFNI3_HT (x(Ni) 0.75) + HFNI3_RT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77778) |
| HfNi-01Wan-LB.tdb | 1472.75 | HF8NI21 (x(Ni) 0.72414) + HFNI3_RT (x(Ni) 0.75) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-01Wan-LB.tdb | 1468.9 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64867) + HF3NI7 (x(Ni) 0.7) |
| HfNi-01Wan-LB.tdb | 1468.9 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64865) + HF3NI7 (x(Ni) 0.7) |
| HfNi-01Wan-LB.tdb | 1468.9 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64863) + HF3NI7 (x(Ni) 0.7) |
| HfNi-01Wan-LB.tdb | 1461.83 | HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.9038) + FCC_A1 (x(Ni) 0.98713) |
| HfNi-01Wan-LB.tdb | 1461.83 | HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.90386) + FCC_A1 (x(Ni) 0.98714) |
| HfNi-01Wan-LB.tdb | 1448 | HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) + HFNI3_RT (x(Ni) 0.75) |
| HfNi-01Wan-LB.tdb | 1443.21 | HF2NI_C16 (x(Ni) 0.33243) + LIQUID (x(Ni) 0.38571) + HFNI_HT (x(Ni) 0.5) |
| HfNi-01Wan-LB.tdb | 1443.21 | HF2NI_C16 (x(Ni) 0.33243) + LIQUID (x(Ni) 0.3857) + HFNI_HT (x(Ni) 0.5) |
| HfNi-01Wan-LB.tdb | 1427.62 | HCP_A3 (x(Ni) 0.0131) + BCC_A2 (x(Ni) 0.08438) + LIQUID (x(Ni) 0.25535) |
| HfNi-01Wan-LB.tdb | 1423.15 | HFNI_HT (x(Ni) 0.5) + HFNI_B33 (x(Ni) 0.5) + HF9NI11 (x(Ni) 0.55) |
| HfNi-01Wan-LB.tdb | 1423.15 | HF2NI_C16 (x(Ni) 0.33249) + HFNI_B33 (x(Ni) 0.5) + HFNI_HT (x(Ni) 0.5) |
| HfNi-01Wan-LB.tdb | 1414.33 | HCP_A3 (x(Ni) 0.0133) + LIQUID (x(Ni) 0.2575) + HF2NI_C16 (x(Ni) 0.31837) |
| HfNi-01Wan-LB.tdb | 1289.3 | HF7NI10 (x(Ni) 0.58824) + HF3NI7 (x(Ni) 0.7) + HFNI3_RT (x(Ni) 0.75) |
| HfNi-08Zha.tdb | 1621.33 | LIQUID (x(Ni) 0.70357) + HFNI3_HT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77782) |
| HfNi-08Zha.tdb | 1621.33 | LIQUID (x(Ni) 0.70352) + HFNI3_HT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77782) |
| HfNi-08Zha.tdb | 1613.74 | HFNI_HT (x(Ni) 0.5) + HF9NI11 (x(Ni) 0.55) + LIQUID (x(Ni) 0.58233) |
| HfNi-08Zha.tdb | 1613.74 | HFNI_HT (x(Ni) 0.5) + HF9NI11 (x(Ni) 0.55) + LIQUID (x(Ni) 0.58227) |
| HfNi-08Zha.tdb | 1573.01 | LIQUID (x(Ni) 0.68682) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-08Zha.tdb | 1573 | LIQUID (x(Ni) 0.68694) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-08Zha.tdb | 1573 | LIQUID (x(Ni) 0.68688) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-08Zha.tdb | 1561.61 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60542) |
| HfNi-08Zha.tdb | 1561.61 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60545) |
| HfNi-08Zha.tdb | 1561.61 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60533) |
| HfNi-08Zha.tdb | 1521.75 | LIQUID (x(Ni) 0.66926) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-08Zha.tdb | 1521.75 | LIQUID (x(Ni) 0.66922) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-08Zha.tdb | 1521.75 | LIQUID (x(Ni) 0.66918) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-08Zha.tdb | 1505.38 | HF2NI7 (x(Ni) 0.79323) + HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.88447) |
| HfNi-08Zha.tdb | 1472.75 | HFNI3_HT (x(Ni) 0.75) + HFNI3_RT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77779) |
| HfNi-08Zha.tdb | 1472.75 | HF8NI21 (x(Ni) 0.72414) + HFNI3_RT (x(Ni) 0.75) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-08Zha.tdb | 1472.75 | HFNI3_HT (x(Ni) 0.75) + HFNI3_RT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77779) |
| HfNi-08Zha.tdb | 1468.9 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64867) + HF3NI7 (x(Ni) 0.7) |
| HfNi-08Zha.tdb | 1468.9 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64865) + HF3NI7 (x(Ni) 0.7) |
| HfNi-08Zha.tdb | 1468.9 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64863) + HF3NI7 (x(Ni) 0.7) |
| HfNi-08Zha.tdb | 1461.83 | HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.9038) + FCC_A1 (x(Ni) 0.98713) |
| HfNi-08Zha.tdb | 1461.83 | HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.90386) + FCC_A1 (x(Ni) 0.98714) |
| HfNi-08Zha.tdb | 1448 | HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) + HFNI3_RT (x(Ni) 0.75) |
| HfNi-08Zha.tdb | 1443.21 | HF2NI_C16 (x(Ni) 0.33243) + LIQUID (x(Ni) 0.38571) + HFNI_HT (x(Ni) 0.5) |
| HfNi-08Zha.tdb | 1443.21 | HF2NI_C16 (x(Ni) 0.33243) + LIQUID (x(Ni) 0.3857) + HFNI_HT (x(Ni) 0.5) |
| HfNi-08Zha.tdb | 1427.62 | HCP_A3 (x(Ni) 0.0131) + BCC_A2 (x(Ni) 0.08438) + LIQUID (x(Ni) 0.25535) |
| HfNi-08Zha.tdb | 1423.15 | HFNI_HT (x(Ni) 0.5) + HFNI_B33 (x(Ni) 0.5) + HF9NI11 (x(Ni) 0.55) |
| HfNi-08Zha.tdb | 1423.15 | HF2NI_C16 (x(Ni) 0.33249) + HFNI_B33 (x(Ni) 0.5) + HFNI_HT (x(Ni) 0.5) |
| HfNi-08Zha.tdb | 1414.33 | HCP_A3 (x(Ni) 0.0133) + LIQUID (x(Ni) 0.2575) + HF2NI_C16 (x(Ni) 0.31837) |
| HfNi-08Zha.tdb | 1289.3 | HF7NI10 (x(Ni) 0.58824) + HF3NI7 (x(Ni) 0.7) + HFNI3_RT (x(Ni) 0.75) |
| HfNi-11Cac.tdb | 1632.16 | LIQUID (x(Ni) 0.70381) + HFNI3_HT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77778) |
| HfNi-11Cac.tdb | 1632.16 | LIQUID (x(Ni) 0.70384) + HFNI3_HT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77778) |
| HfNi-11Cac.tdb | 1614.88 | HFNI_HT (x(Ni) 0.5) + HF9NI11 (x(Ni) 0.55) + LIQUID (x(Ni) 0.58182) |
| HfNi-11Cac.tdb | 1614.88 | HFNI_HT (x(Ni) 0.5) + HF9NI11 (x(Ni) 0.55) + LIQUID (x(Ni) 0.58176) |
| HfNi-11Cac.tdb | 1579.97 | LIQUID (x(Ni) 0.68692) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-11Cac.tdb | 1579.96 | LIQUID (x(Ni) 0.68676) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-11Cac.tdb | 1579.96 | LIQUID (x(Ni) 0.68678) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-11Cac.tdb | 1563.05 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60492) |
| HfNi-11Cac.tdb | 1563.05 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60495) |
| HfNi-11Cac.tdb | 1563.05 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60487) |
| HfNi-11Cac.tdb | 1524.08 | LIQUID (x(Ni) 0.66877) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-11Cac.tdb | 1524.08 | LIQUID (x(Ni) 0.66869) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-11Cac.tdb | 1518.65 | HF2NI7 (x(Ni) 0.77778) + HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.87871) |
| HfNi-11Cac.tdb | 1518.65 | HF2NI7 (x(Ni) 0.77778) + HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.87854) |
| HfNi-11Cac.tdb | 1472.75 | HFNI3_HT (x(Ni) 0.75) + HFNI3_RT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77778) |
| HfNi-11Cac.tdb | 1472.75 | HF8NI21 (x(Ni) 0.72414) + HFNI3_RT (x(Ni) 0.75) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-11Cac.tdb | 1469.21 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64859) + HF3NI7 (x(Ni) 0.7) |
| HfNi-11Cac.tdb | 1469.21 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64858) + HF3NI7 (x(Ni) 0.7) |
| HfNi-11Cac.tdb | 1462.05 | HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.90381) + FCC_A1 (x(Ni) 0.98712) |
| HfNi-11Cac.tdb | 1462.05 | HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.90386) + FCC_A1 (x(Ni) 0.98713) |
| HfNi-11Cac.tdb | 1448 | HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) + HFNI3_RT (x(Ni) 0.75) |
| HfNi-11Cac.tdb | 1442.99 | HF2NI_C16 (x(Ni) 0.33243) + LIQUID (x(Ni) 0.38563) + HFNI_HT (x(Ni) 0.5) |
| HfNi-11Cac.tdb | 1430.4 | HCP_A3 (x(Ni) 0.01301) + BCC_A2 (x(Ni) 0.08403) + LIQUID (x(Ni) 0.25454) |
| HfNi-11Cac.tdb | 1423.15 | HFNI_HT (x(Ni) 0.5) + HFNI_B33 (x(Ni) 0.5) + HF9NI11 (x(Ni) 0.55) |
| HfNi-11Cac.tdb | 1423.15 | HF2NI_C16 (x(Ni) 0.33249) + HFNI_B33 (x(Ni) 0.5) + HFNI_HT (x(Ni) 0.5) |
| HfNi-11Cac.tdb | 1412.18 | HCP_A3 (x(Ni) 0.01324) + LIQUID (x(Ni) 0.25726) + HF2NI_C16 (x(Ni) 0.31844) |
| HfNi-11Cac.tdb | 1289.3 | HF7NI10 (x(Ni) 0.58824) + HF3NI7 (x(Ni) 0.7) + HFNI3_RT (x(Ni) 0.75) |
| HfNi-18Ros.tdb | 1803.02 | HCP_A3 (x(Ni) 2.700e-4) + B2_BCC (x(Ni) 0.04538) + LIQUID (x(Ni) 0.1698) |
| HfNi-18Ros.tdb | 1616.09 | B2_BCC (x(Ni) 0.50634) + HF9NI11 (x(Ni) 0.55) + LIQUID (x(Ni) 0.58378) |
| HfNi-18Ros.tdb | 1616.09 | B2_BCC (x(Ni) 0.50633) + HF9NI11 (x(Ni) 0.55) + LIQUID (x(Ni) 0.58373) |
| HfNi-18Ros.tdb | 1616.09 | B2_BCC (x(Ni) 0.50633) + HF9NI11 (x(Ni) 0.55) + LIQUID (x(Ni) 0.58373) |
| HfNi-18Ros.tdb | 1616.09 | B2_BCC (x(Ni) 0.50634) + HF9NI11 (x(Ni) 0.55) + LIQUID (x(Ni) 0.58378) |
| HfNi-18Ros.tdb | 1596.62 | LIQUID (x(Ni) 0.70387) + HFNI3_HT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77782) |
| HfNi-18Ros.tdb | 1567.94 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60299) |
| HfNi-18Ros.tdb | 1567.94 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60292) |
| HfNi-18Ros.tdb | 1567.94 | HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.60306) |
| HfNi-18Ros.tdb | 1554.04 | LIQUID (x(Ni) 0.68788) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-18Ros.tdb | 1554.04 | LIQUID (x(Ni) 0.68791) + HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) |
| HfNi-18Ros.tdb | 1529.43 | LIQUID (x(Ni) 0.67756) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-18Ros.tdb | 1529.43 | LIQUID (x(Ni) 0.67755) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-18Ros.tdb | 1529.43 | LIQUID (x(Ni) 0.67755) + HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) |
| HfNi-18Ros.tdb | 1511.72 | HF2NI7 (x(Ni) 0.79866) + HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.88148) |
| HfNi-18Ros.tdb | 1488.9 | HF2NI_C16 (x(Ni) 0.32628) + LIQUID (x(Ni) 0.3447) + B2_BCC (x(Ni) 0.44348) |
| HfNi-18Ros.tdb | 1488.9 | HF2NI_C16 (x(Ni) 0.32628) + LIQUID (x(Ni) 0.3447) + B2_BCC (x(Ni) 0.44348) |
| HfNi-18Ros.tdb | 1477.05 | HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.89433) + FCC_A1 (x(Ni) 0.98196) |
| HfNi-18Ros.tdb | 1477.05 | HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.89436) + FCC_A1 (x(Ni) 0.98197) |
| HfNi-18Ros.tdb | 1470.06 | HFNI3_RT (x(Ni) 0.75) + HFNI3_HT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77781) |
| HfNi-18Ros.tdb | 1470.06 | HFNI3_HT (x(Ni) 0.75) + HFNI3_RT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.77781) |
| HfNi-18Ros.tdb | 1470.06 | HF8NI21 (x(Ni) 0.72414) + HFNI3_HT (x(Ni) 0.75) + HFNI3_RT (x(Ni) 0.75) |
| HfNi-18Ros.tdb | 1464.59 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64886) + HF3NI7 (x(Ni) 0.7) |
| HfNi-18Ros.tdb | 1464.59 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64887) + HF3NI7 (x(Ni) 0.7) |
| HfNi-18Ros.tdb | 1455.99 | HCP_A3 (x(Ni) 1.900e-4) + LIQUID (x(Ni) 0.26204) + HF2NI_C16 (x(Ni) 0.31648) |
| HfNi-18Ros.tdb | 1449.89 | HF3NI7 (x(Ni) 0.7) + HF8NI21 (x(Ni) 0.72414) + HFNI3_RT (x(Ni) 0.75) |
| HfNi-18Ros.tdb | 1420.12 | HFNI_B33 (x(Ni) 0.5) + B2_BCC (x(Ni) 0.50161) + HF9NI11 (x(Ni) 0.55) |
| HfNi-18Ros.tdb | 1420.12 | HFNI_B33 (x(Ni) 0.5) + B2_BCC (x(Ni) 0.50161) + HF9NI11 (x(Ni) 0.55) |
| HfNi-18Ros.tdb | 1350.9 | HF2NI_C16 (x(Ni) 0.32927) + B2_BCC (x(Ni) 0.47358) + HFNI_B33 (x(Ni) 0.5) |
| HfNi-18Ros.tdb | 1292.47 | HF7NI10 (x(Ni) 0.58824) + HF3NI7 (x(Ni) 0.7) + HFNI3_RT (x(Ni) 0.75) |
| HfNi-18Ros.tdb | 1259.27 | HFNI_B33 (x(Ni) 0.5) + HF9NI11 (x(Ni) 0.55) + HF7NI10 (x(Ni) 0.58824) |
| HfNi-18Ros.tdb | 765.57 | HFNI3_RT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.7806) + HFNI5_C15B (x(Ni) 0.83333) |
| HfNi-18Ros.tdb | 765.57 | HFNI3_RT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.78059) + HFNI5_C15B (x(Ni) 0.83333) |
| HfNi-18Ros.tdb | 765.57 | HFNI3_RT (x(Ni) 0.75) + HF2NI7 (x(Ni) 0.7806) + HFNI5_C15B (x(Ni) 0.83333) |
| HfNi-18Ros.tdb | 752.47 | HFNI_B33 (x(Ni) 0.5) + HF7NI10 (x(Ni) 0.58824) + HFNI3_RT (x(Ni) 0.75) |
| HfNi-18Ros.tdb | 533.45 | HCP_A3 (x(Ni) 0) + HF2NI_C16 (x(Ni) 0.33325) + HFNI_B33 (x(Ni) 0.5) |
| HfNi-18Ros.tdb | 301.54 | HFNI3_RT (x(Ni) 0.75) + HFNI5_C15B (x(Ni) 0.83333) + FCC_A1 (x(Ni) 1) |
| HfNi-75Kau.tdb | 2016.68 | BCC_A2 (x(Ni) 8.100e-4) + HCP_A3 (x(Ni) 9.300e-4) + LIQUID (x(Ni) 0.15846) |
| HfNi-75Kau.tdb | 1675.31 | HF2NI7 (x(Ni) 0.77778) + HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.84279) |
| HfNi-75Kau.tdb | 1675.3 | HF2NI7 (x(Ni) 0.77778) + HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.84282) |
| HfNi-75Kau.tdb | 1675.3 | HF2NI7 (x(Ni) 0.77778) + HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.84282) |
| HfNi-75Kau.tdb | 1612.16 | LIQUID (x(Ni) 0.69091) + HF2NI5 (x(Ni) 0.71429) + HF2NI7 (x(Ni) 0.77778) |
| HfNi-75Kau.tdb | 1612.16 | LIQUID (x(Ni) 0.69092) + HF2NI5 (x(Ni) 0.71429) + HF2NI7 (x(Ni) 0.77778) |
| HfNi-75Kau.tdb | 1573.12 | HFNI_B33 (x(Ni) 0.5) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.62035) |
| HfNi-75Kau.tdb | 1573.11 | HFNI_B33 (x(Ni) 0.5) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.62064) |
| HfNi-75Kau.tdb | 1573.11 | HFNI_B33 (x(Ni) 0.5) + HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.6207) |
| HfNi-75Kau.tdb | 1555.55 | HF2NI_C16 (x(Ni) 0.33333) + LIQUID (x(Ni) 0.35793) + HFNI_B33 (x(Ni) 0.5) |
| HfNi-75Kau.tdb | 1555.55 | HF2NI_C16 (x(Ni) 0.33333) + LIQUID (x(Ni) 0.35809) + HFNI_B33 (x(Ni) 0.5) |
| HfNi-75Kau.tdb | 1527.53 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64675) + HF2NI5 (x(Ni) 0.71429) |
| HfNi-75Kau.tdb | 1527.53 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64688) + HF2NI5 (x(Ni) 0.71429) |
| HfNi-75Kau.tdb | 1527.53 | HF7NI10 (x(Ni) 0.58824) + LIQUID (x(Ni) 0.64674) + HF2NI5 (x(Ni) 0.71429) |
| HfNi-75Kau.tdb | 1501.79 | HCP_A3 (x(Ni) 0.00195) + LIQUID (x(Ni) 0.25924) + HF2NI_C16 (x(Ni) 0.33333) |
| HfNi-75Kau.tdb | 1410.87 | HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.92446) + FCC_A1 (x(Ni) 0.99414) |
| HfNi-75Kau.tdb | 1410.87 | HFNI5_C15B (x(Ni) 0.83333) + LIQUID (x(Ni) 0.9245) + FCC_A1 (x(Ni) 0.99415) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/HF/HF-NI.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/HF/HF-NI.json) · [CALPHAD hull HfNi-01Wan-LB](https://data.orchid-project.org/hulls/calphad-sgte/HF/HF-NI--HfNi-01Wan-LB.json) · [CALPHAD hull HfNi-08Zha](https://data.orchid-project.org/hulls/calphad-sgte/HF/HF-NI--HfNi-08Zha.json) · [CALPHAD hull HfNi-11Cac](https://data.orchid-project.org/hulls/calphad-sgte/HF/HF-NI--HfNi-11Cac.json) · [CALPHAD hull HfNi-75Kau](https://data.orchid-project.org/hulls/calphad-sgte/HF/HF-NI--HfNi-75Kau.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Hf–Ni system (5)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1470.15 | eutectic: L -> Hf7Ni10 + Hf3Ni7 | L: Ni 0.649; Hf7Ni10: Ni 0.589; Hf3Ni7: Ni 0.7 | model | [1] Cacciamani 2011 | Table 5, p. 7, row 7; `ORC-WLVZMAKDOL` |  |
| 1462.15 | eutectic: L -> HfNi5 + Ni | L: Ni 0.904; HfNi5: Ni 0.833; Ni: Ni 0.987 | model | [1] Cacciamani 2011 | Table 5, p. 7, row 8; `ORC-WGETN6HZC5` |  |
| 1443.15 | eutectic: L -> Hf2Ni + β-HfNi | L: Ni 0.386; Hf2Ni: Ni 0.332; β-HfNi: Ni 0.5 | model | [1] Cacciamani 2011 | Table 5, p. 7, row 6; `ORC-3LIKRCZLUG` |  |
| 1430.15 | metatectic/catatectic: bcc-Hf -> hcp-Hf + L | bcc-Hf: Ni 0.029; hcp-Hf: Ni 0.004; L: Ni 0.101 | model | [1] Cacciamani 2011 | Table 5, p. 7, row 4; `ORC-PIJ4FUIP4P` |  |
| 1412.15 | eutectic: L -> hcp-Hf + Hf2Ni | L: Ni 0.257; hcp-Hf: Ni 0.013; Hf2Ni: Ni 0.333 | model | [1] Cacciamani 2011 | Table 5, p. 7, row 5; `ORC-K3WE6GMWU5` |  |

## Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from [dft_parity.json](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Hf–Ni system (26)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| B33-HfNi |  | -50.06 kJ/mol (basis unstated) | 0 | DFT |  |  | [2] Berche 2016 | Table 2, p. 4, row 5; `ORC-SWSJNQ2BTR.6e34ee` |  |
| C15-HfNi2 |  | -46.01 kJ/mol (basis unstated) | 0 | DFT |  |  | [2] Berche 2016 | Table 2, p. 4, row 8; `ORC-DKVV5WBFEL.a46e41` |  |
| C15b-HfNi5 |  | -33.65 kJ/mol (basis unstated) | 0 | DFT |  |  | [2] Berche 2016 | Table 2, p. 4, row 12; `ORC-5BCHB6S3VB.49d737` |  |
| C16-Hf2Ni |  | -32.85 kJ/mol (basis unstated) | 0 | DFT |  |  | [2] Berche 2016 | Table 2, p. 4, row 4; `ORC-UQJS5SDZRO.1d8d06` |  |
| Hf(fcc-A1) |  | 6.92 kJ/mol-atom | 298.15 | model |  |  | [3] Ross 2018 | Table 1, p. 4, row 13; `ORC-4MYJ3AWCDR.abc2ef` |  |
| Hf(hcp-A3) |  | 0 kJ/mol-atom | 298.15 | model |  |  | [3] Ross 2018 | Table 1, p. 4, row 14; `ORC-D5L34MTVI5.5fe4b8` |  |
| Hf(hcp-A3) |  | 0 kJ/mol-atom | 298.15 | model |  |  | [3] Ross 2018; _cites Berche 2016_ [doi](https://doi.org/10.1016/j.commatsci.2016.08.042) | Table 1, p. 4, row 15; `ORC-ZI2OLEGY4O.42e5bb` |  |
| Hf2Ni7 |  | -45.1 kJ/mol (basis unstated) | 0 | DFT |  |  | [2] Berche 2016 | Table 2, p. 4, row 11; `ORC-WODAGSDF5C.21e172` |  |
| Hf3Ni7 |  | -48.71 kJ/mol (basis unstated) | 0 | DFT |  |  | [2] Berche 2016 | Table 2, p. 4, row 9; `ORC-WV52QW42TL.a2f04d` |  |
| Hf7Ni10 |  | -49.99 kJ/mol (basis unstated) | 0 | DFT |  |  | [2] Berche 2016 | Table 2, p. 4, row 6; `ORC-6WJKO2ZURF.258bb2` |  |
| Hf8Ni21 |  | -48.09 kJ/mol (basis unstated) | 0 | DFT |  |  | [2] Berche 2016 | Table 2, p. 4, row 13; `ORC-2WMVBESIWF.91fad7` |  |
| Hf9Ni11 |  | -47.61 kJ/mol (basis unstated) | 0 | DFT |  |  | [2] Berche 2016 | Table 2, p. 4, row 7; `ORC-QMBHCWHOGL.8d3e2b` |  |
| Ni3Hf(L12) | [HfNi3](https://data.orchid-project.org/compounds/HfNi3.html) | -51.41 kJ/mol-atom | 298.15 | model | -51.918 (mp-aaaaasag) | -49.866 (oqmd-344729) | [3] Ross 2018 | Table 1, p. 4, row 16; `ORC-RNJJ4OPH5G.b230ab` |  |
| Ni5Hf(C15b) | [HfNi5](https://data.orchid-project.org/compounds/HfNi5.html) | -33.67 kJ/mol-atom | 298.15 | model | -33.322 (mp-aaabgkmm) | -33.745 (oqmd-19424) | [3] Ross 2018 | Table 1, p. 4, row 2; `ORC-KGXCD4BLYH.d91922` |  |
| Ni5Hf(C15b) | [HfNi5](https://data.orchid-project.org/compounds/HfNi5.html) | -33.65 kJ/mol-atom | 298.15 | model | -33.322 (mp-aaabgkmm) | -33.745 (oqmd-19424) | [3] Ross 2018; _cites Berche 2016_ [doi](https://doi.org/10.1016/j.commatsci.2016.08.042) | Table 1, p. 4, row 3; `ORC-EQYZ4EKJTF.12d489` |  |
| Ni7Hf2 | [Hf2Ni7](https://data.orchid-project.org/compounds/Hf2Ni7.html) | -45.18 kJ/mol-atom | 298.15 | model | -44.758 (mp-aaacqpve) | -45.225 (oqmd-1437798) | [3] Ross 2018 | Table 1, p. 4, row 4; `ORC-MCM6OSD5NL.0b1437` |  |
| Ni7Hf2 | [Hf2Ni7](https://data.orchid-project.org/compounds/Hf2Ni7.html) | -45.1 kJ/mol-atom | 298.15 | model | -44.758 (mp-aaacqpve) | -45.225 (oqmd-1437798) | [3] Ross 2018; _cites Berche 2016_ [doi](https://doi.org/10.1016/j.commatsci.2016.08.042) | Table 1, p. 4, row 5; `ORC-SUIJ6WR7DL.c202dd` |  |
| Ni7Hf3 | [Hf3Ni7](https://data.orchid-project.org/compounds/Hf3Ni7.html) | -48.88 kJ/mol-atom | 298.15 | model | -48.429 (mp-aaaaboew) | -48.931 (oqmd-2175) | [3] Ross 2018 | Table 1, p. 4, row 6; `ORC-QTR653AO47.3bab61` |  |
| Ni7Hf3 | [Hf3Ni7](https://data.orchid-project.org/compounds/Hf3Ni7.html) | -48.71 kJ/mol-atom | 298.15 | model | -48.429 (mp-aaaaboew) | -48.931 (oqmd-2175) | [3] Ross 2018; _cites Berche 2016_ [doi](https://doi.org/10.1016/j.commatsci.2016.08.042) | Table 1, p. 4, row 7; `ORC-5LTSSEU5BD.76be18` |  |
| NiHf(B2) | [HfNi](https://data.orchid-project.org/compounds/HfNi.html) | -41.77 kJ/mol-atom | 298.15 | model | -50.09 (mp-aaacfyaa) | -41.908 (oqmd-305271) | [3] Ross 2018 | Table 1, p. 4, row 10; `ORC-SMDYQTNVJ5.a51ff8` |  |
| NiHf(B33) | [HfNi](https://data.orchid-project.org/compounds/HfNi.html) | -50.06 kJ/mol-atom | 298.15 | model | -50.09 (mp-aaacfyaa) | -50.079 (oqmd-30515) | [3] Ross 2018; _cites Berche 2016_ [doi](https://doi.org/10.1016/j.commatsci.2016.08.042) | Table 1, p. 4, row 9; `ORC-OFNCAV2ZOM.953f73` |  |
| NiHf(B33) | [HfNi](https://data.orchid-project.org/compounds/HfNi.html) | -50 kJ/mol-atom | 298.15 | model | -50.09 (mp-aaacfyaa) | -50.079 (oqmd-30515) | [3] Ross 2018 | Table 1, p. 4, row 8; `ORC-2V6MMT6W3Q.b18886` |  |
| NiHf2 | [Hf2Ni](https://data.orchid-project.org/compounds/Hf2Ni.html) | -32.88 kJ/mol-atom | 298.15 | model | -32.839 (mp-aaaaabhd) | -32.982 (oqmd-88683) | [3] Ross 2018 | Table 1, p. 4, row 11; `ORC-HI2NIG257C.1c1787` |  |
| NiHf2 | [Hf2Ni](https://data.orchid-project.org/compounds/Hf2Ni.html) | -32.85 kJ/mol-atom | 298.15 | model | -32.839 (mp-aaaaabhd) | -32.982 (oqmd-88683) | [3] Ross 2018; _cites Berche 2016_ [doi](https://doi.org/10.1016/j.commatsci.2016.08.042) | Table 1, p. 4, row 12; `ORC-XV264PQMCQ.32a4ff` |  |
| NiHf3(L12) | [Hf3Ni](https://data.orchid-project.org/compounds/Hf3Ni.html) | -1.6 kJ/mol-atom | 298.15 | model | 3.481 (mp-aaacpkik) | 3.469 (oqmd-345248) | [3] Ross 2018 | Table 1, p. 4, row 17; `ORC-L7AKTTTK6T.f4661a` |  |
| α-HfNi3 |  | -52.23 kJ/mol (basis unstated) | 0 | DFT |  |  | [2] Berche 2016 | Table 2, p. 4, row 10; `ORC-5D3KENYQR6.bd35fa` |  |

## Other properties

### Phase transition (7)

Table: Phase transition, Hf–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1420 K | 1420 | B33 -> B2 | model | [3] Ross 2018 | p. 9; `ORC-6LH6T2ZTVT.9c49ea` | “The calculated value for the transition from B33 to B2 was 1420 K which falls close to the measured value of 1433 K by DSC and synchrotron data in this work.” |
| Phase transition | 1433 K | 1433 | B33 -> B2 | experimental | [3] Ross 2018 | p. 9; `ORC-6LH6T2ZTVT.c8b2c0` | “The calculated value for the transition from B33 to B2 was 1420 K which falls close to the measured value of 1433 K by DSC and synchrotron data in this work.” |
| Phase transition | 1433 K | 1433 | other | experimental | [3] Ross 2018 | p. 9; `ORC-OQ24YQTD4F` | “DSC results found a high temperature transition at 1433 K and HEXRD experiments confirmed this phase to be the B2 phase - although the exact nature of the transformation still warrants investigation.” |
| Phase transition | 1493.15 K | 1493.15 | congruent transformation | experimental | [1] Cacciamani 2011; _cites Yeremenko 1993_ [doi](https://doi.org/10.1016/0925-8388%2893%2990281-q) | p. 5; `ORC-FQUV6JJPSO` | “Afterwards Yeremenko et al. \[46\] reinvestigated the Hf rich part of the diagram determining, in particular, the congruent melting of the Hf2 Ni phase at 1220 °C.” |
| Phase transition | 1508.15 K | 1508.15 | congruent melting: L -> Hf2Ni; _L: Ni 0.333; Hf2Ni: Ni 0.333_ | model | [1] Cacciamani 2011 | Table 5, p. 7, row 3; `ORC-B6PJC636NH` |  |
| Phase transition | 1754.15 K | 1754.15 | congruent melting: L -> Hf2Ni7; _L: Ni 0.778; Hf2Ni7: Ni 0.778_ | model | [1] Cacciamani 2011 | Table 5, p. 7, row 2; `ORC-RO44TTQ5XD` |  |
| Phase transition | 1808.15 K | 1808.15 | congruent melting: L -> β-HfNi; _L: Ni 0.5; β-HfNi: Ni 0.5_ | model | [1] Cacciamani 2011 | Table 5, p. 7, row 1; `ORC-Z4RGQEHHKP` |  |

### Phase equilibrium (4)

Table: Phase equilibrium, Hf–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase assemblage |  | 1123 | Ni + HfNi5 + Hf2Ni7 + HfNi3 + Hf7Ni10 + Hf9Ni11 + HfNi; _alloy: Ni 1_ | experimental | [3] Ross 2018; _cites Wang 2001_ | Table 3, p. 5, row 1; `ORC-D4VMAXSSQX` |  |
| Phase assemblage |  | 1173 | Ni + HfNi5 + Hf2Ni7 + HfNi3 + Hf7Ni10 + Hf9Ni11 + HfNi; _alloy: Ni 1_ | experimental | [3] Ross 2018 | Table 3, p. 5, row 3; `ORC-F3DCW4LNSX` |  |
| Phase assemblage |  | 1173 | Ni + HfNi5 + Hf2Ni7 + HfNi3 + Hf7Ni10 + Hf9Ni11 + HfNi; _alloy: Ni 1_ | experimental | [3] Ross 2018; _cites Wang 2001_ | Table 3, p. 5, row 2; `ORC-R63JDYX5ZR` |  |
| Phase assemblage |  | 1373 | Ni + HfNi5 + Hf2Ni7 + HfNi3 + Hf3Ni7 + Hf7Ni10 + Hf9Ni11 + HfNi; _alloy: Ni 1_ | experimental | [3] Ross 2018 | Table 3, p. 5, row 4; `ORC-LZS7JC7A66` |  |

### Mixing / partial (15)

Table: Mixing / partial, Hf–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Enthalpy of mixing; _printed: ΔH_ | -55.15 kJ/mol-atom |  | B2; _alloy: Ni 0.5_ | model | [3] Ross 2018 | Table 2, p. 4, row 6; `ORC-K7DQFSZIQI.198982` |  |
| Enthalpy of mixing; _printed: ΔH_ | -49.68 kJ/mol-atom |  | L12; _alloy: Ni 0.75_ | model | [3] Ross 2018 | Table 2, p. 4, row 14; `ORC-JFQCQ7TUJB.46c8f9` |  |
| Enthalpy of mixing; _printed: ΔH_ | 3.59 kJ/mol-atom |  | L12; _alloy: Ni 0.25_ | model | [3] Ross 2018 | Table 2, p. 4, row 15; `ORC-LHHF4LOYLJ.3612b0` |  |
| Enthalpy of mixing; _printed: ΔH_ | -8.06 kJ/mol-atom |  | bcc-A2; _alloy: Ni 0.25_ | model | [3] Ross 2018 | Table 2, p. 4, row 4; `ORC-2EKSW6DYOY.221cf5` |  |
| Enthalpy of mixing; _printed: ΔH_ | -9.13 kJ/mol-atom |  | bcc-A2; _alloy: Ni 0.969697_ | model | [3] Ross 2018 | Table 2, p. 4, row 1; `ORC-3DU6H76OP4.013860` |  |
| Enthalpy of mixing; _printed: ΔH_ | -1.3 kJ/mol-atom |  | bcc-A2; _alloy: Ni 0.030303_ | model | [3] Ross 2018 | Table 2, p. 4, row 5; `ORC-3TKEVVMXL2.82343f` |  |
| Enthalpy of mixing; _printed: ΔH_ | -8.81 kJ/mol-atom |  | bcc-A2; _alloy: Ni 0.5_ | model | [3] Ross 2018 | Table 2, p. 4, row 3; `ORC-OCXI7TLGHL.065df7` |  |
| Enthalpy of mixing; _printed: ΔH_ | -17.06 kJ/mol-atom |  | bcc-A2; _alloy: Ni 0.75_ | model | [3] Ross 2018 | Table 2, p. 4, row 2; `ORC-QANEROFXOH.c54c30` |  |
| Enthalpy of mixing; _printed: ΔH_ | -29.94 kJ/mol-atom |  | bcc-B2 | model | [3] Ross 2018 | Table 2, p. 4, row 7; `ORC-OVW7PKBNS5.2492ff` |  |
| Enthalpy of mixing; _printed: ΔH_ | -10.22 kJ/mol-atom |  | bcc-B2 | model | [3] Ross 2018 | Table 2, p. 4, row 8; `ORC-WM6IOAYSXD.31d003` |  |
| Enthalpy of mixing; _printed: ΔH_ | 2.24 kJ/mol-atom |  | fcc-A1; _alloy: Ni 0.030303_ | model | [3] Ross 2018 | Table 2, p. 4, row 13; `ORC-3VPHYT2VEW.a5b207` |  |
| Enthalpy of mixing; _printed: ΔH_ | -6.75 kJ/mol-atom |  | fcc-A1; _alloy: Ni 0.969697_ | model | [3] Ross 2018 | Table 2, p. 4, row 9; `ORC-ERE2IKL5BV.3e3705` |  |
| Enthalpy of mixing; _printed: ΔH_ | -6.45 kJ/mol-atom |  | fcc-A1; _alloy: Ni 0.75_ | model | [3] Ross 2018 | Table 2, p. 4, row 10; `ORC-G73WOIXNMN.3f989b` |  |
| Enthalpy of mixing; _printed: ΔH_ | -6.46 kJ/mol-atom |  | fcc-A1; _alloy: Ni 0.5_ | model | [3] Ross 2018 | Table 2, p. 4, row 11; `ORC-TZO5HCE2EU.eab19b` |  |
| Enthalpy of mixing; _printed: ΔH_ | 3.65 kJ/mol-atom |  | fcc-A1; _alloy: Ni 0.25_ | model | [3] Ross 2018 | Table 2, p. 4, row 12; `ORC-XWTQOXNBAI.d6c917` |  |

### Heat capacity / entropy / enthalpy (6)

Table: Heat capacity / entropy / enthalpy, Hf–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: S298.15_ | 38.8683 J/mol-atom/K | 298.15 | Hf(hcp-A3); _alloy: Ni 0_ | model | [3] Ross 2018 | Table 1, p. 4, row 14; `ORC-D5L34MTVI5.7d7560` |  |
| Entropy; _printed: S298.15_ | 29.0286 J/mol-atom/K | 298.15 | Ni3Hf(L12); _alloy: Ni 0.75_ | model | [3] Ross 2018 | Table 1, p. 4, row 16; `ORC-RNJJ4OPH5G.afba84` |  |
| Entropy; _printed: S298.15_ | 27.4825 J/mol-atom/K | 298.15 | Ni5Hf(C15b); _alloy: Ni 0.833333_ | model | [3] Ross 2018 | Table 1, p. 4, row 2; `ORC-KGXCD4BLYH.d04807` |  |
| Entropy; _printed: S298.15_ | 40.29 J/mol-atom/K | 298.15 | NiHf(B2); _alloy: Ni 0.5_ | model | [3] Ross 2018 | Table 1, p. 4, row 10; `ORC-SMDYQTNVJ5.855936` |  |
| Entropy; _printed: S298.15_ | 38.8575 J/mol-atom/K | 298.15 | NiHf(B33); _alloy: Ni 0.5_ | model | [3] Ross 2018 | Table 1, p. 4, row 8; `ORC-2V6MMT6W3Q.2793bb` |  |
| Entropy; _printed: S298.15_ | 51.5817 J/mol-atom/K | 298.15 | NiHf2; _alloy: Ni 0.333333_ | model | [3] Ross 2018 | Table 1, p. 4, row 11; `ORC-HI2NIG257C.1e93ea` |  |

### Crystal structure (23)

Table: Crystal structure, Hf–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a; _printed: a_ | 3.242 Å | 0 | B33-HfNi; _alloy: Ni 0.5_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 5; `ORC-EZ3ARAAN3N.578f83` |  |
| Lattice a; _printed: a_ | 6.673 Å | 0 | C15-HfNi2; _alloy: Ni 0.666667_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 8; `ORC-IAI7M53EZE.c4c23e` |  |
| Lattice a; _printed: a_ | 6.92 Å | 0 | C15b-HfNi5; _alloy: Ni 0.833333_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 12; `ORC-3JVNKSVQH5.4d91ee` |  |
| Lattice a; _printed: a_ | 6.411 Å | 0 | C16-Hf2Ni; _alloy: Ni 0.333333_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 4; `ORC-QGG5BVQ6YL.2815a0` |  |
| Lattice a; _printed: a_ | 4.666 Å | 0 | Hf2Ni7; _alloy: Ni 0.777778_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 11; `ORC-TBD36PPM67.c569e6` |  |
| Lattice a; _printed: a_ | 6.512 Å | 0 | Hf3Ni7; _alloy: Ni 0.7_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 9; `ORC-5TFECMEBQ7.c63f18` |  |
| Lattice a; _printed: a_ | 9.11 Å | 0 | Hf7Ni10; _alloy: Ni 0.588235_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 6; `ORC-UNS5FDIRN7.28152c` |  |
| Lattice a; _printed: a_ | 6.424 Å | 0 | Hf8Ni21; _alloy: Ni 0.724138_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 13; `ORC-F2PVJYYCNK.3c512a` |  |
| Lattice a; _printed: a_ | 9.811 Å | 0 | Hf9Ni11; _alloy: Ni 0.55_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 7; `ORC-D36QIBIH4Q.b93367` |  |
| Lattice a; _printed: a_ | 5.278 Å | 0 | α-HfNi3; _alloy: Ni 0.75_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 10; `ORC-5SD54IYJM7.66f795` |  |
| Lattice b; _printed: b_ | 9.817 Å | 0 | B33-HfNi; _alloy: Ni 0.5_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 5; `ORC-EZ3ARAAN3N.8bcb03` |  |
| Lattice b; _printed: b_ | 8.187 Å | 0 | Hf2Ni7; _alloy: Ni 0.777778_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 11; `ORC-TBD36PPM67.b455dc` |  |
| Lattice b; _printed: b_ | 6.582 Å | 0 | Hf3Ni7; _alloy: Ni 0.7_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 9; `ORC-5TFECMEBQ7.21abc7` |  |
| Lattice b; _printed: b_ | 9.103 Å | 0 | Hf7Ni10; _alloy: Ni 0.588235_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 6; `ORC-UNS5FDIRN7.1271d9` |  |
| Lattice b; _printed: b_ | 7.998 Å | 0 | Hf8Ni21; _alloy: Ni 0.724138_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 13; `ORC-F2PVJYYCNK.821322` |  |
| Lattice c; _printed: c_ | 4.085 Å | 0 | B33-HfNi; _alloy: Ni 0.5_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 5; `ORC-EZ3ARAAN3N.10abd2` |  |
| Lattice c; _printed: c_ | 5.24 Å | 0 | C16-Hf2Ni; _alloy: Ni 0.333333_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 4; `ORC-QGG5BVQ6YL.e77cca` |  |
| Lattice c; _printed: c_ | 12.099 Å | 0 | Hf2Ni7; _alloy: Ni 0.777778_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 11; `ORC-TBD36PPM67.9eeef1` |  |
| Lattice c; _printed: c_ | 7.635 Å | 0 | Hf3Ni7; _alloy: Ni 0.7_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 9; `ORC-5TFECMEBQ7.420bd2` |  |
| Lattice c; _printed: c_ | 12.29 Å | 0 | Hf7Ni10; _alloy: Ni 0.588235_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 6; `ORC-UNS5FDIRN7.7fa52e` |  |
| Lattice c; _printed: c_ | 8.531 Å | 0 | Hf8Ni21; _alloy: Ni 0.724138_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 13; `ORC-F2PVJYYCNK.9dfee7` |  |
| Lattice c; _printed: c_ | 6.444 Å | 0 | Hf9Ni11; _alloy: Ni 0.55_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 7; `ORC-D36QIBIH4Q.a25a12` |  |
| Lattice c; _printed: c_ | 21.433 Å | 0 | α-HfNi3; _alloy: Ni 0.75_ | DFT | [2] Berche 2016 | Table 2, p. 4, row 10; `ORC-5SD54IYJM7.cc9da9` |  |

## Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

1. 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). [doi:10.1016/j.calphad.2011.10.003](https://doi.org/10.1016/j.calphad.2011.10.003)
2. A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016). [doi:10.1016/j.commatsci.2016.08.042](https://doi.org/10.1016/j.commatsci.2016.08.042)
3. 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). [doi:10.1016/j.tca.2018.08.011](https://doi.org/10.1016/j.tca.2018.08.011)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735859
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- 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 the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); 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).

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_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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 ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).