# Fe–Ni system

> Fe–Ni system: 60 accepted literature values (crystal structure 30, phase transition 12, formation 9, invariant reaction 8) and 12 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

60 accepted literature values from 5 paper(s) (experimental 4, model 15, DFT 33, unspecified 8); 12 calculated phase diagram(s). 13 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/FE-NI.json) · [CSV](https://data.orchid-project.org/systems/FE-NI.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#FE-NI) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-00Ans-2SL.json) · [phases (10)](https://data.orchid-project.org/phases/pages/FE-NI.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/FE-NI.html) · [Markdown](https://data.orchid-project.org/systems/FE-NI.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 4 |
| model | 15 |
| DFT | 33 |
| unspecified | 8 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 8 |
| phase transition | 12 |
| formation | 9 |
| mixing / partial | 1 |
| crystal structure | 30 |

## 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 |
|---|---|---|---|
| FeNi-00Ans-2SL.tdb | I. Ansara, unpublished, 2000. | `79b9e2435a00dd13114a6ab484f46b25cd1262873c905b8a75b9ef484682ea7f` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-00Ans-2SL.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-00Ans-2SL.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-00Ans-2SL.json) |
| FeNi-00Ans-4SL.tdb | I. Ansara, unpublished, 2000. | `a4d9738122fd5737ada943edafad1a4fd4b80104d6e84e0d482af41ef0d9459f` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-00Ans-4SL.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-00Ans-4SL.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-00Ans-4SL.json) |
| FeNi-03Dup-LB.tdb | N. Dupin, B. Sundman, March 2003 at JEEP. | `f10470dbf794292e45191eb5a757e818280cd6eb3961a182ab4876c087168b74` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-03Dup-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-03Dup-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-03Dup-LB.json) |
| FeNi-03Dup-mod.tdb | N. Dupin, B. Sundman, March 2003 at JEEP. | `7ec5d4a5548add6917ce41483775e43d672505f225e83cb4628d3719723cbba5` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-03Dup-mod.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-03Dup-mod.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-03Dup-mod.json) |
| FeNi-10Cac.tdb | G. Cacciamani, A. Dinsdale, M. Palumbo, A. Pasturel, Intermetallics, 18, 1148-62(2010). [doi:10.1016/j.intermet.2010.02.026](https://doi.org/10.1016/j.intermet.2010.02.026) | `37c0af627bda598904d46d4e9102e40d34491d6e26624eec256b91987628b4b3` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-10Cac.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-10Cac.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-10Cac.json) |
| FeNi-11Xio.tdb | W. Xiong, H. Zhang, L. Vitos, M. Selleby, Acta Mater., 59, 521-30(2011). [doi:10.1016/j.actamat.2010.09.055](https://doi.org/10.1016/j.actamat.2010.09.055) | `220b0102be8248795839cf026450b3247ae7d2979def2424c876572211d16966` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-11Xio.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-11Xio.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-11Xio.json) |
| FeNi-19Ohn.tdb | I. Ohnuma, S. Shimenouchi, T. Omori, K. Ishida, R. Kainuma, Calphad, 67, 101677, 2019. [doi:10.1016/j.calphad.2019.101677](https://doi.org/10.1016/j.calphad.2019.101677) | `ce2ce2a7c3f6c47575f5dda0c2f63c73d4ab0d99638f75adb953226a13537fc8` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-19Ohn.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-19Ohn.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-19Ohn.json) |
| FeNi-23Jac.tdb | A. Jacob, E. Povoden-Karadeniz, P. Retzl, E. Kozeschnik, Calphad, 81, 102531(2023). [doi:10.1016/j.calphad.2023.102531](https://doi.org/10.1016/j.calphad.2023.102531) | `1c6890e44cf1a0f48f1c1424b66cc59e4f8b5921863458aeca158f2b1a7c5b9b` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-23Jac.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-23Jac.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-23Jac.json) |
| FeNi-23Wit.tdb | V.T. Witusiewicz, O. Stryzhyboroda, S. Vinke, K. Bobzin, U. Hecht, J. Alloys Compd., 935, 168118(2023). [doi:10.1016/j.jallcom.2022.168118](https://doi.org/10.1016/j.jallcom.2022.168118) | `65e467a6d693b565c8f73beb62efa4b5420704ab8533fae1b30e01308b261a76` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-23Wit.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-23Wit.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-23Wit.json) |
| FeNi-23Zha.tdb | Z.-T. Zhang, J.-J. Wang, W. Liu, X.-G. Lu, J. Iron Steel Res. Int., 30, 660-76(2023). [doi:10.1007/s42243-022-00846-9](https://doi.org/10.1007/s42243-022-00846-9) | `c205b78c12aa1e7362c21bf3dde8a1dacf4a48c08a2e1a61d69d695dac2a3017` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-23Zha.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-23Zha.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-23Zha.json) |
| FeNi-85Xin.tdb | Z.S. Xing, D.D. Gohil, A.T. Dinsdale, T. Chart, DMA(A) 103, National Physical Laboratory, London, 1985. | `89060926e9804263dac9b21393a3ed417ec0f6455d0327448a94f47d41844770` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-85Xin.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-85Xin.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-85Xin.json) |
| FeNi-95Ans.tdb | I. Ansara, unpublished, 1995. | `e629405a3fc1ba63c082eb583e87a290b6f68c780f5b3ece09f766636fb51022` | [viewer](https://orchid-project.org/phase-diagrams/#FE-NI/FeNi-95Ans.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeNi-95Ans.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeNi-95Ans.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| FeNi-00Ans-2SL.tdb | 1791.47 | BCC_A2 (x(Ni) 0.03871) + FCC_A1 (x(Ni) 0.04396) + LIQUID (x(Ni) 0.04904) |
| FeNi-00Ans-2SL.tdb | 634.19 | BCC_A2 (x(Ni) 0.0344) + L12_FCC (x(Ni) 0.52236) + L12_FCC#2 (x(Ni) 0.63137) |
| FeNi-00Ans-2SL.tdb | 634.19 | BCC_A2 (x(Ni) 0.0344) + FCC_A1 (x(Ni) 0.52236) + L12_FCC (x(Ni) 0.63137) |
| FeNi-00Ans-4SL.tdb | 1791.47 | BCC_A2 (x(Ni) 0.03871) + FCC_4SL (x(Ni) 0.04396) + LIQUID (x(Ni) 0.04904) |
| FeNi-00Ans-4SL.tdb | 1791.47 | BCC_A2 (x(Ni) 0.03871) + FCC_A1 (x(Ni) 0.04396) + LIQUID (x(Ni) 0.04904) |
| FeNi-00Ans-4SL.tdb | 1667.47 | BCC_A2 (x(Ni) 0) + FCC_4SL (x(Ni) 0) + FCC_A1 (x(Ni) 0) |
| FeNi-00Ans-4SL.tdb | 1184.81 | BCC_A2 (x(Ni) 0) + FCC_4SL (x(Ni) 0) + FCC_A1 (x(Ni) 0) |
| FeNi-00Ans-4SL.tdb | 642.04 | BCC_A2 (x(Ni) 0.03568) + FCC_A1 (x(Ni) 0.51841) + FCC_4SL (x(Ni) 0.63417) |
| FeNi-00Ans-4SL.tdb | 642.04 | BCC_A2 (x(Ni) 0.03568) + FCC_4SL (x(Ni) 0.51841) + FCC_4SL#2 (x(Ni) 0.63417) |
| FeNi-03Dup-LB.tdb | 1790.36 | B2_BCC (x(Ni) 0.03827) + FCC_4SL (x(Ni) 0.04346) + LIQUID (x(Ni) 0.04906) |
| FeNi-03Dup-LB.tdb | 1790.36 | B2_BCC (x(Ni) 0.03827) + FCC_A1 (x(Ni) 0.04346) + LIQUID (x(Ni) 0.04906) |
| FeNi-03Dup-LB.tdb | 1667.45 | B2_BCC (x(Ni) 0) + FCC_4SL (x(Ni) 0) + FCC_A1 (x(Ni) 0) |
| FeNi-03Dup-LB.tdb | 632.78 | B2_BCC (x(Ni) 0.03417) + FCC_4SL (x(Ni) 0.52303) + FCC_4SL#2 (x(Ni) 0.62009) |
| FeNi-03Dup-mod.tdb | 1790.36 | B2_BCC (x(Ni) 0.03828) + FCC_4SL (x(Ni) 0.04347) + LIQUID (x(Ni) 0.04907) |
| FeNi-03Dup-mod.tdb | 1184.81 | BCC_A2 (x(Ni) 0) + FCC_4SL (x(Ni) 0) + FCC_A1 (x(Ni) 0) |
| FeNi-03Dup-mod.tdb | 1066.09 | B2_BCC (x(Ni) 1) + FCC_4SL (x(Ni) 1) + FCC_A1 (x(Ni) 1) |
| FeNi-03Dup-mod.tdb | 776.83 | FCC_4SL (x(Ni) 0.76509) + FCC_A1 (x(Ni) 0.76794) + B2_BCC (x(Ni) 1) |
| FeNi-03Dup-mod.tdb | 559.72 | BCC_A2 (x(Ni) 0.02273) + FCC_A1 (x(Ni) 0.54734) + FCC_4SL (x(Ni) 0.61438) |
| FeNi-03Dup-mod.tdb | 559.72 | BCC_A2 (x(Ni) 0.02273) + FCC_4SL (x(Ni) 0.54734) + FCC_4SL#2 (x(Ni) 0.61438) |
| FeNi-03Dup-mod.tdb | 448.18 | BCC_A2 (x(Ni) 0.0074) + FCC_4SL (x(Ni) 0.64988) + B2_BCC (x(Ni) 1) |
| FeNi-03Dup-mod.tdb | 448.18 | BCC_A2 (x(Ni) 0.0074) + FCC_4SL (x(Ni) 0.64988) + B2_BCC (x(Ni) 1) |
| FeNi-10Cac.tdb | 1786.78 | B2_BCC (x(Ni) 0.05185) + FCC_4SL (x(Ni) 0.0571) + LIQUID (x(Ni) 0.06419) |
| FeNi-10Cac.tdb | 701.22 | B2_BCC (x(Ni) 0.06396) + FCC_4SL#2 (x(Ni) 0.44397) + FCC_4SL (x(Ni) 0.47441) |
| FeNi-10Cac.tdb | 568.81 | BCC_A2 (x(Ni) 0.0486) + FCC_4SL (x(Ni) 0.5373) + FCC_4SL#2 (x(Ni) 0.55838) |
| FeNi-10Cac.tdb | 568.81 | BCC_4SL (x(Ni) 0.0486) + FCC_4SL (x(Ni) 0.5373) + FCC_4SL#2 (x(Ni) 0.55838) |
| FeNi-10Cac.tdb | 568.81 | BCC_4SL (x(Ni) 0.0486) + FCC_4SL (x(Ni) 0.5373) + FCC_4SL#2 (x(Ni) 0.55838) |
| FeNi-10Cac.tdb | 568.81 | B2_BCC (x(Ni) 0.0486) + FCC_4SL#2 (x(Ni) 0.5373) + FCC_4SL (x(Ni) 0.55838) |
| FeNi-11Xio.tdb | 1809.86 | BCC_A2 (x(Ni) 0.00231) + LIQUID (x(Ni) 0.00288) + FCC_A1 (x(Ni) 0.00763) |
| FeNi-19Ohn.tdb | 1789.66 | BCC_A2 (x(Ni) 0.03708) + FCC_4SL (x(Ni) 0.04252) + LIQUID (x(Ni) 0.04865) |
| FeNi-19Ohn.tdb | 1789.66 | BCC_A2 (x(Ni) 0.03708) + FCC_A1 (x(Ni) 0.04252) + LIQUID (x(Ni) 0.04865) |
| FeNi-19Ohn.tdb | 1667.47 | BCC_A2 (x(Ni) 0) + FCC_4SL (x(Ni) 0) + FCC_A1 (x(Ni) 0) |
| FeNi-19Ohn.tdb | 319.5 | BCC_A2 (x(Ni) 0.04198) + FCC_4SL#2 (x(Ni) 0.52518) + FCC_4SL (x(Ni) 0.55491) |
| FeNi-23Jac.tdb | 1814.99 | LIQUID (x(Ni) 0.03105) + BCC_A2 (x(Ni) 0.03223) + FCC_A1 (x(Ni) 0.03786) |
| FeNi-23Jac.tdb | 700.65 | BCC_A2 (x(Ni) 0.07252) + FCC_A1#2 (x(Ni) 0.42989) + FCC_A1 (x(Ni) 0.44958) |
| FeNi-23Wit.tdb | 1786.79 | BCC_A2 (x(Ni) 0.05184) + FCC_A1 (x(Ni) 0.05709) + LIQUID (x(Ni) 0.06418) |
| FeNi-23Wit.tdb | 701.22 | BCC_A2 (x(Ni) 0.06396) + FCC_A1#2 (x(Ni) 0.44397) + FCC_A1 (x(Ni) 0.47441) |
| FeNi-23Wit.tdb | 616.83 | BCC_A2 (x(Ni) 0.05458) + FCC_A1 (x(Ni) 0.52664) + FENI3_L12 (x(Ni) 0.62165) |
| FeNi-23Zha.tdb | 1788.8 | BCC_A2 (x(Ni) 0.03783) + FCC_A1 (x(Ni) 0.04305) + LIQUID (x(Ni) 0.04935) |
| FeNi-23Zha.tdb | 1788.8 | BCC_A2 (x(Ni) 0.03783) + L12_FCC (x(Ni) 0.04305) + LIQUID (x(Ni) 0.04935) |
| FeNi-23Zha.tdb | 1667.47 | BCC_A2 (x(Ni) 0) + FCC_A1 (x(Ni) 0) + L12_FCC (x(Ni) 0) |
| FeNi-23Zha.tdb | 694.74 | BCC_A2 (x(Ni) 0.05342) + FCC_A1 (x(Ni) 0.43878) + FCC_A1#2 (x(Ni) 0.47119) |
| FeNi-23Zha.tdb | 630.1 | BCC_A2 (x(Ni) 0.04687) + FCC_A1 (x(Ni) 0.51713) + L12_FCC (x(Ni) 0.62765) |
| FeNi-85Xin.tdb | 1791.47 | BCC_A2 (x(Ni) 0.03871) + FCC_A1 (x(Ni) 0.04396) + LIQUID (x(Ni) 0.04904) |
| FeNi-95Ans.tdb | 1791.47 | BCC_A2 (x(Ni) 0.03871) + FCC_A1 (x(Ni) 0.04396) + LIQUID (x(Ni) 0.04904) |
| FeNi-95Ans.tdb | 633.16 | BCC_A2 (x(Ni) 0.03423) + FCC_A1 (x(Ni) 0.52285) + L12_FCC (x(Ni) 0.62397) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/FE/FE-NI.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/FE/FE-NI.json) · [CALPHAD hull FeNi-00Ans-2SL](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-00Ans-2SL.json) · [CALPHAD hull FeNi-00Ans-4SL](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-00Ans-4SL.json) · [CALPHAD hull FeNi-03Dup-LB](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-03Dup-LB.json) · [CALPHAD hull FeNi-03Dup-mod](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-03Dup-mod.json) · [CALPHAD hull FeNi-10Cac](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-10Cac.json) · [CALPHAD hull FeNi-11Xio](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-11Xio.json) · [CALPHAD hull FeNi-19Ohn](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-19Ohn.json) · [CALPHAD hull FeNi-23Wit](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-23Wit.json) · [CALPHAD hull FeNi-23Zha](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-23Zha.json) · [CALPHAD hull FeNi-85Xin](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-85Xin.json) · [CALPHAD hull FeNi-95Ans](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-NI--FeNi-95Ans.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Fe–Ni system (8)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1787.15 | peritectic: δ-Fe + liquid -> γ-(Fe,Ni) | δ-Fe: Ni 0.035; L: Ni 0.049; γ-(Fe,Ni): Ni 0.042 | unspecified | [1] Cacciamani 2010; _cites Swartzendruber 1991_ [doi](https://doi.org/10.1007/bf02649918) | Table 4, p. 11, row 1; `ORC-FAFOB453BA` |  |
| 1787.15 | peritectic: δ-Fe + liquid -> γ-(Fe,Ni) | δ-Fe: Ni 0.052; L: Ni 0.064; γ-(Fe,Ni): Ni 0.057 | model | [1] Cacciamani 2010 | Table 4, p. 11, row 2; `ORC-Q65KLCB57T` |  |
| 701.15 | monotectoid: γ-(Fe,Ni)PM -> α-Fe + γ-(Fe,Ni)FM | γ-(Fe,Ni)PM: Ni 0.444; α-Fe: Ni 0.064; γ-(Fe,Ni)FM: Ni 0.475 | model | [1] Cacciamani 2010 | Table 4, p. 11, row 10; `ORC-NLADIFVVCT` |  |
| 688.15 | monotectoid: γ-(Fe,Ni)PM -> α-Fe + γ-(Fe,Ni)FM | γ-(Fe,Ni)PM: Ni 0.435; α-Fe: Ni 0.042; γ-(Fe,Ni)FM: Ni 0.475 | unspecified | [1] Cacciamani 2010; _cites Kuznetsov 2003_ | Table 4, p. 11, row 8; `ORC-VHPMVBU5D3` |  |
| 673.15 | monotectoid: γ-(Fe,Ni)PM -> α-Fe + γ-(Fe,Ni)FM | γ-(Fe,Ni)PM: Ni 0.4; α-Fe: Ni 0.06; γ-(Fe,Ni)FM: Ni 0.46 | experimental | [1] Cacciamani 2010; _cites Yang 1996_ [doi](https://doi.org/10.1007/bf02665999) | Table 4, p. 11, row 9; `ORC-XYQH5M42RZ` |  |
| 626.15 | eutectoid: γ-(Fe,Ni)FM -> α-Fe + FeNi3 | γ-(Fe,Ni)FM: Ni 0.525; α-Fe: Ni 0.056; FeNi3: Ni 0.555 | model | [1] Cacciamani 2010 | Table 4, p. 11, row 15; `ORC-MNQLH432KQ` |  |
| 620.15 | eutectoid: γ-(Fe,Ni)FM -> α-Fe + FeNi3 | γ-(Fe,Ni)FM: Ni 0.49; α-Fe: Ni 0.047; FeNi3: Ni 0.63 | unspecified | [1] Cacciamani 2010; _cites Swartzendruber 1991_ [doi](https://doi.org/10.1007/bf02649918) | Table 4, p. 11, row 13; `ORC-RNO4OUIQKM` |  |
| 618.15 | eutectoid: γ-(Fe,Ni)FM -> α-Fe + FeNi3 | γ-(Fe,Ni)FM: Ni 0.53; α-Fe: Ni 0.032; FeNi3: Ni 0.636 | unspecified | [1] Cacciamani 2010; _cites Kuznetsov 2003_ | Table 4, p. 11, row 14; `ORC-6QDKKYDVZQ` |  |

## 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, Fe–Ni system (9)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Fe2Ni C11f |  | -0.6 kJ/mol-atom | 0 | DFT |  |  | [1] Cacciamani 2010 | Table 3, p. 7, row 6; `ORC-R3VD3ZHXVK` |  |
| Fe3Ni D03 |  | 4.3 kJ/mol-atom | 0 | DFT |  |  | [1] Cacciamani 2010 | Table 3, p. 7, row 5; `ORC-3Q6NMA327L` |  |
| Fe3Ni L12 |  | 5.2 kJ/mol-atom | 0 | DFT |  |  | [1] Cacciamani 2010 | Table 3, p. 7, row 4; `ORC-IDNJTWI7MU` |  |
| FeNi B2 |  | 8.9 kJ/mol-atom | 0 | DFT |  |  | [1] Cacciamani 2010 | Table 3, p. 7, row 8; `ORC-ZR7LF4EWDG` |  |
| FeNi B32 |  | 2.9 kJ/mol-atom | 0 | DFT |  |  | [1] Cacciamani 2010 | Table 3, p. 7, row 9; `ORC-EHDGWAGB6C` |  |
| FeNi L10 |  | -5.5 kJ/mol-atom | 0 | DFT |  |  | [1] Cacciamani 2010 | Table 3, p. 7, row 7; `ORC-RLTG4RPETH` |  |
| FeNi2 C11f |  | -4.6 kJ/mol-atom | 0 | DFT |  |  | [1] Cacciamani 2010 | Table 3, p. 7, row 10; `ORC-KJ5MG5SCG3` |  |
| FeNi3 D03 |  | 2.8 kJ/mol-atom | 0 | DFT |  |  | [1] Cacciamani 2010 | Table 3, p. 7, row 12; `ORC-Y5A4YUKO2Y` |  |
| FeNi3 L12 |  | -7.7 kJ/mol-atom | 0 | DFT |  |  | [1] Cacciamani 2010 | Table 3, p. 7, row 11; `ORC-DETVRTFPJ6` |  |

## Other properties

### Phase transition (12)

Table: Phase transition, Fe–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 523.15 K | 523.15 | other | model | [1] Cacciamani 2010 | p. 4; `ORC-VTZAIPQY5E` | “In the FeeNi system, they found that, besides the L12 FeNi3 ordered phase, the L10 is also stable at low temperature with a transition temperature around 250 C.” |
| Phase transition | 593.15 K | 593.15 | other | experimental | [1] Cacciamani 2010; _cites Pauleve 1962_ | p. 3; `ORC-4Q7Q7V5FMV` | “- L10 FeNi can be obtained as a metastable phase at 50 at% Ni. It has a critical ordering temperature of about 320 C, as determined by \[76\].” |
| Phase transition | 735.15 K | 735.15 | critical point: γ-(Fe,Ni)PM + γ-(Fe,Ni)FM; _γ-(Fe,Ni)PM: Ni 0.48; γ-(Fe,Ni)FM: Ni 0.48_ | unspecified | [1] Cacciamani 2010; _cites Kuznetsov 2003_ | Table 4, p. 11, row 6; `ORC-W5EDRJEFRD` |  |
| Phase transition | 745.15 K | 745.15 | critical point: γ-(Fe,Ni)PM + γ-(Fe,Ni)FM; _γ-(Fe,Ni)PM: Ni 0.484; γ-(Fe,Ni)FM: Ni 0.484_ | model | [1] Cacciamani 2010 | Table 4, p. 11, row 7; `ORC-XGDLFYYECT` |  |
| Phase transition | 787.15 K | 787.15 | congruent transformation: FeNi3 -> γ-(Fe,Ni); _FeNi3: Ni 0.723; γ-(Fe,Ni): Ni 0.723_ | model | [1] Cacciamani 2010 | Table 4, p. 11, row 12; `ORC-X6M5PUBVJU` |  |
| Phase transition | 790.15 K | 790.15 | congruent transformation: FeNi3 -> γ-(Fe,Ni); _FeNi3: Ni 0.725; γ-(Fe,Ni): Ni 0.725_ | unspecified | [1] Cacciamani 2010; _cites Swartzendruber 1991_ [doi](https://doi.org/10.1007/bf02649918) | Table 4, p. 11, row 11; `ORC-C2TABD3GDW` |  |
| Phase transition | 888.4 K | 888.4 | magnetic | model | [2] Mathon 2009; _cites Dinsdale 1986_ | p. 4; `ORC-RQN7ZYCA3O` | “It has to be noticed that the TC (fcc_A1, FeNi3 ) calculated from \[16\] chosen for our thermodynamic database is 888,4 K.” |
| Phase transition | 953 K | 953 | magnetic | experimental | [2] Mathon 2009 | p. 4; `ORC-3JK3YBXT56.f4755c` | “From their experimental results, they deduced by extrapolation the Curie temperature for the ordered L12 \_FeNi3 to be 953 K; they point out that they are in agreement with the value of 954 K from Wakelin and Yates \[68\].” |
| Phase transition | 954 K | 954 | magnetic | experimental | [2] Mathon 2009; _cites Wakelin 1953_ [doi](https://doi.org/10.1088/0370-1301/66/3/310) | p. 4; `ORC-3JK3YBXT56.a91c9e` | “From their experimental results, they deduced by extrapolation the Curie temperature for the ordered L12 \_FeNi3 to be 953 K; they point out that they are in agreement with the value of 954 K from Wakelin and Yates \[68\].” |
| Phase transition | 1705.15 K | 1705.15 | congruent melting: γ-(Fe,Ni) -> liquid; _γ-(Fe,Ni): Ni 0.663; L: Ni 0.663_ | model | [1] Cacciamani 2010 | Table 4, p. 11, row 5; `ORC-CCAZFSCLA2` |  |
| Phase transition | 1713.15 K | 1713.15 | congruent melting: γ-(Fe,Ni) -> liquid; _γ-(Fe,Ni): Ni 0.66; L: Ni 0.66_ | unspecified | [1] Cacciamani 2010; _cites Swartzendruber 1991_ [doi](https://doi.org/10.1007/bf02649918) | Table 4, p. 11, row 3; `ORC-6CRIGBIZYZ` |  |
| Phase transition | 1716.15 K | 1716.15 | congruent melting: γ-(Fe,Ni) -> liquid; _γ-(Fe,Ni): Ni 0.66; L: Ni 0.66_ | unspecified | [1] Cacciamani 2010; _cites Swartzendruber 1991_ [doi](https://doi.org/10.1007/bf02649918) | Table 4, p. 11, row 4; `ORC-L3GAEKPPE5` |  |

### Mixing / partial (1)

Table: Mixing / partial, Fe–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Enthalpy of mixing; _printed: ΔmixH^SQS_ | -6.517 kJ/mol-atom |  | fcc; _alloy: Fe 0.5, Ni 0.5_ | DFT | [3] Bracq 2021 | Table 1, p. 4, row 9; `ORC-3AW5Y6MGSQ.4dfdfd` |  |

### Crystal structure (30)

Table: Crystal structure, Fe–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 2.8577 Å |  | bcc; _alloy: Fe 0.75, Ni 0.25_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 7; `ORC-2IM3WT3ILO.384b49` |  |
| Lattice a | 2.8547 Å |  | bcc; _alloy: Fe 0.7, Ni 0.3_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 8; `ORC-3HZVLMHVFL.011fda` |  |
| Lattice a | 2.8279 Å |  | bcc; _alloy: Fe 0.3, Ni 0.7_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 11; `ORC-4HCJFPQZGS.3d2c23` |  |
| Lattice a | 2.8487 Å |  | bcc; _alloy: Fe 0.96, Ni 0.04_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 3; `ORC-D6CTK3BDQJ.d97b07` |  |
| Lattice a | 2.812 Å |  | bcc; _alloy: Fe 0.1, Ni 0.9_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 14; `ORC-FNPLER6ZCW.0962ac` |  |
| Lattice a | 2.8602 Å |  | bcc; _alloy: Fe 0.9, Ni 0.1_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 6; `ORC-M62AA2PKS7.060013` |  |
| Lattice a | 2.8202 Å |  | bcc; _alloy: Fe 0.2, Ni 0.8_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 13; `ORC-OSXWCJT7TU.3c9564` |  |
| Lattice a | 2.8514 Å |  | bcc; _alloy: Fe 0.95, Ni 0.05_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 4; `ORC-R6WPRQRZKR.426639` |  |
| Lattice a | 2.8428 Å |  | bcc; _alloy: Fe 0.98, Ni 0.02_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 2; `ORC-TALKNSQGBR.9d40c6` |  |
| Lattice a | 2.8569 Å |  | bcc; _alloy: Fe 0.925, Ni 0.075_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 5; `ORC-V5Z6KRLYL5.7a5694` |  |
| Lattice a | 2.8241 Å |  | bcc; _alloy: Fe 0.25, Ni 0.75_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 12; `ORC-WPEVW5CQY2.5b1f46` |  |
| Lattice a | 2.8353 Å |  | bcc; _alloy: Fe 0.4, Ni 0.6_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 10; `ORC-Y4UKEUIB77.112006` |  |
| Lattice a | 2.8422 Å |  | bcc; _alloy: Fe 0.5, Ni 0.5_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 9; `ORC-YPJSYJONXD.887068` |  |
| Lattice a | 2.805 Å |  | bcc; _alloy: Fe 0.01, Ni 0.99_ | DFT | [4] Xiong 2011 | Table 1, p. 5, row 15; `ORC-Z2SHU3I3II.1c9173` |  |
| Lattice a | 3.5523 Å | 298.15 | FeNi3; _alloy: Ni 0.75_ | model | [1] Cacciamani 2010 | Table 1, p. 4, row 5; `ORC-U4MWVESLRO` |  |
| Lattice a | 2.8665 Å | 298.15 | α-Fe, δ-Fe; _alloy: Ni 0_ | model | [1] Cacciamani 2010; _cites Kuznetsov 2003_ | Table 1, p. 4, row 2; `ORC-L53VSABFTY.85b4f4` |  |
| Lattice a | 2.9315 Å | 298.15 | α-Fe, δ-Fe; _alloy: Ni 0_ | model | [1] Cacciamani 2010; _cites Kuznetsov 2003_ | Table 1, p. 4, row 2; `ORC-L53VSABFTY.c80f6d` |  |
| Lattice a | 3.6467 Å | 298.15 | γ-(Fe,Ni); _alloy: Ni 0.5_ | model | [1] Cacciamani 2010; _cites Kuznetsov 2003_ | Table 1, p. 4, row 1; `ORC-UPKWABTBSE.31124b` |  |
| Lattice a | 3.524 Å | 298.15 | γ-(Fe,Ni); _alloy: Ni 0.5_ | model | [1] Cacciamani 2010; _cites Kuznetsov 2003_ | Table 1, p. 4, row 1; `ORC-UPKWABTBSE.72ea00` |  |
| Lattice a | 3.575 Å | 298.15 | γ-(Fe,Ni); _alloy: Ni 0.5_ | model | [1] Cacciamani 2010; _cites Kuznetsov 2003_ | Table 1, p. 4, row 1; `ORC-UPKWABTBSE.eb608f` |  |
| Lattice a | 3.5523 Å | 790.15 (\<) | FeNi3 | model | [5] Keyzer 2009 | Table 1, p. 3, row 4; `ORC-PHYN2WVVT6` |  |
| lattice unspecified axis; _printed: a0_ | 3.504 Å | 0 | Fe2Ni C11f; _alloy: Fe 0.667, Ni 0.333_ | DFT | [1] Cacciamani 2010 | Table 3, p. 7, row 6; `ORC-Q2KNNO6P4L` |  |
| lattice unspecified axis; _printed: a0_ | 5.705 Å | 0 | Fe3Ni D03; _alloy: Fe 0.75, Ni 0.25_ | DFT | [1] Cacciamani 2010 | Table 3, p. 7, row 5; `ORC-2MDFDY3CDH` |  |
| lattice unspecified axis; _printed: a0_ | 3.56 Å | 0 | Fe3Ni L12; _alloy: Fe 1, Ni 0_ | DFT | [1] Cacciamani 2010 | Table 3, p. 7, row 4; `ORC-DIV3352BXK` |  |
| lattice unspecified axis; _printed: a0_ | 2.844 Å | 0 | FeNi B2; _alloy: Fe 0.5, Ni 0.5_ | DFT | [1] Cacciamani 2010 | Table 3, p. 7, row 8; `ORC-VAW3RNLAT6` |  |
| lattice unspecified axis; _printed: a0_ | 5.668 Å | 0 | FeNi B32; _alloy: Fe 0.5, Ni 0.5_ | DFT | [1] Cacciamani 2010 | Table 3, p. 7, row 9; `ORC-Z2G42IUFZB` |  |
| lattice unspecified axis; _printed: a0_ | 3.547 Å | 0 | FeNi L10; _alloy: Fe 0.5, Ni 0.5_ | DFT | [1] Cacciamani 2010 | Table 3, p. 7, row 7; `ORC-WR7LI4HSJS` |  |
| lattice unspecified axis; _printed: a0_ | 3.55 Å | 0 | FeNi2 C11f; _alloy: Fe 0.333, Ni 0.667_ | DFT | [1] Cacciamani 2010 | Table 3, p. 7, row 10; `ORC-MIFUE3ZVUF` |  |
| lattice unspecified axis; _printed: a0_ | 5.6 Å | 0 | FeNi3 D03; _alloy: Fe 0.25, Ni 0.75_ | DFT | [1] Cacciamani 2010 | Table 3, p. 7, row 12; `ORC-DFZEWATM5J` |  |
| lattice unspecified axis; _printed: a0_ | 3.5 Å | 0 | FeNi3 L12; _alloy: Fe 0.25, Ni 0.75_ | DFT | [1] Cacciamani 2010 | Table 3, p. 7, row 11; `ORC-B2PYHAMZ5Z` |  |

## Sources

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

1. G. Cacciamani, A. Dinsdale, M. Palumbo, A. Pasturel, The Fe–Ni system: Thermodynamic modelling assisted by atomistic calculations, Intermetallics 18, 1148-1162 (2010). [doi:10.1016/j.intermet.2010.02.026](https://doi.org/10.1016/j.intermet.2010.02.026)
2. Muriel Mathon, Damien Connétable, Bo Sundman, Jacques Lacaze, Calphad-type assessment of the Fe–Nb–Ni ternary system, Calphad 33, 136-161 (2009). [doi:10.1016/j.calphad.2008.10.005](https://doi.org/10.1016/j.calphad.2008.10.005)
3. Guillaume Bracq, Jean-Claude Crivello, Mathilde Laurent-Brocq, Jean-Marc Joubert, Ivan Guillot, What is the Enthalpy Contribution to the Stabilization of the Co–Cr–Fe–Mn–Ni Faced-centered Cubic Solid Solution?, J. Phase Equilib. Diffus. 42, 561-570 (2021). [doi:10.1007/s11669-021-00922-9](https://doi.org/10.1007/s11669-021-00922-9)
4. W. Xiong, H. Zhang, L. Vitos, M. Selleby, Magnetic phase diagram of the Fe–Ni system, Acta Materialia 59, 521-530 (2011). [doi:10.1016/j.actamat.2010.09.055](https://doi.org/10.1016/j.actamat.2010.09.055)
5. Jozefien De Keyzer, Gabriele Cacciamani, Nathalie Dupin, Patrick Wollants, Thermodynamic modeling and optimization of the Fe–Ni–Ti system, Calphad 33, 109-123 (2009). [doi:10.1016/j.calphad.2008.10.003](https://doi.org/10.1016/j.calphad.2008.10.003)

## 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/).