# Nb–Ni system

> Nb–Ni system: 145 accepted literature values (invariant reaction 76, formation 45, phase transition 12, crystal structure 7) and 7 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

145 accepted literature values from 7 paper(s) (experimental 62, model 51, DFT 17, unspecified 15); 7 calculated phase diagram(s). 2 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/NB-NI.json) · [CSV](https://data.orchid-project.org/systems/NB-NI.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#NB-NI) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#NB-NI/NbNi-04Jou.json) · [phases (7)](https://data.orchid-project.org/phases/pages/NB-NI.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/NB-NI.html) · [Markdown](https://data.orchid-project.org/systems/NB-NI.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 62 |
| model | 51 |
| DFT | 17 |
| unspecified | 15 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 76 |
| phase transition | 12 |
| phase equilibrium | 5 |
| formation | 45 |
| crystal structure | 7 |

## 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 |
|---|---|---|---|
| NbNi-04Jou.tdb | J.-M. Joubert, B. Sundman, N. Dupin, Calphad, 28, 299-306(2004). [doi:10.1016/j.calphad.2004.09.004](https://doi.org/10.1016/j.calphad.2004.09.004) | `deeaff43899210093dbdb222585882d53cc8e4d5a9da9dcc6699bc629d5125c1` | [viewer](https://orchid-project.org/phase-diagrams/#NB-NI/NbNi-04Jou.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NbNi-04Jou.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NbNi-04Jou.json) |
| NbNi-05Mat.tdb | S. Matsumoto, T. Tokunaga, H. Ohtani, M. Hasebe, Mater. Trans. (JIM), 46, 2920-30(2005). [doi:10.2320/matertrans.46.2920](https://doi.org/10.2320/matertrans.46.2920) | `9c972291ac3457c6e68f0f95cceab7c204f4c462fcc9227bfd3cb1afdd35a9a8` | [viewer](https://orchid-project.org/phase-diagrams/#NB-NI/NbNi-05Mat.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NbNi-05Mat.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NbNi-05Mat.json) |
| NbNi-06Che-orig.tdb | H. Chen, Y. Du, Calphad, 30, 308-15(2006). [doi:10.1016/j.calphad.2006.02.005](https://doi.org/10.1016/j.calphad.2006.02.005) | `7543cfd042008b381893ed9e4d93145eb36a78c68e3c8d0db25ed4cfe8dd7e51` | [viewer](https://orchid-project.org/phase-diagrams/#NB-NI/NbNi-06Che-orig.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NbNi-06Che-orig.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NbNi-06Che-orig.json) |
| NbNi-06Che.tdb | H. Chen, Y. Du, Calphad, 30, 308-15(2006). [doi:10.1016/j.calphad.2006.02.005](https://doi.org/10.1016/j.calphad.2006.02.005) | `94258649a65e03a5d250abd41c27423733960c75685d97192409edf98371d157` | [viewer](https://orchid-project.org/phase-diagrams/#NB-NI/NbNi-06Che.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NbNi-06Che.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NbNi-06Che.json) |
| NbNi-20Zho.tdb | C. Zhou, C. Guo, J. Li, C. Li, Z. Du, Metall. Mater. Trans. A, 51A, 5892-5911(2020). [doi:10.1007/s11661-020-05963-2](https://doi.org/10.1007/s11661-020-05963-2) | `9d3a8db6e46d6d6b0973deb92845b13cce94527a04c890b3d81abaf74a4b2fda` | [viewer](https://orchid-project.org/phase-diagrams/#NB-NI/NbNi-20Zho.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NbNi-20Zho.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NbNi-20Zho.json) |
| NbNi-23Sun.tdb | H. Sun, S.-L. Shang, R. Gong, B.J. Bocklund, A.M. Beese, Z.-K. Liu, Calphad, 82, 102563(2023). [doi:10.1016/j.calphad.2023.102563](https://doi.org/10.1016/j.calphad.2023.102563) | `7d38d05f4260a8f6197b686d45b1779939f2f9d10c5c35ac6de18f2a5740cd6e` | [viewer](https://orchid-project.org/phase-diagrams/#NB-NI/NbNi-23Sun.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NbNi-23Sun.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NbNi-23Sun.json) |
| NbNi-96Bol-LB.tdb | A. Bolcavage, U.R. Kattner, J. Phase Equilib., 17, 92-100(1996). [doi:10.1007/BF02665782](https://doi.org/10.1007/BF02665782) | `e375de0639110fbd2b34fbf49c1fd2853bf5d14113358d7a03c7876bb4cb2add` | [viewer](https://orchid-project.org/phase-diagrams/#NB-NI/NbNi-96Bol-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/NbNi-96Bol-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/NbNi-96Bol-LB.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| NbNi-04Jou.tdb | 1564.48 | NBNI3_D0A (x(Ni) 0.76766) + LIQUID (x(Ni) 0.85146) + FCC_A1 (x(Ni) 0.88421) |
| NbNi-04Jou.tdb | 1562.83 | BCC_A2 (x(Ni) 0.0458) + MU_D85 (x(Ni) 0.40288) + LIQUID (x(Ni) 0.46887) |
| NbNi-04Jou.tdb | 1454.45 | MU_D85 (x(Ni) 0.52768) + LIQUID (x(Ni) 0.58848) + NBNI3_D0A (x(Ni) 0.74055) |
| NbNi-04Jou.tdb | 806.09 | NBNI3_D0A (x(Ni) 0.75599) + NBNI8 (x(Ni) 0.88889) + FCC_A1 (x(Ni) 0.93534) |
| NbNi-04Jou.tdb | 806.09 | NBNI3_D0A (x(Ni) 0.75599) + NBNI8 (x(Ni) 0.88889) + FCC_A1 (x(Ni) 0.93536) |
| NbNi-05Mat.tdb | 1555.01 | NBNI3_D0A (x(Ni) 0.77269) + LIQUID (x(Ni) 0.85186) + FCC_A1 (x(Ni) 0.87575) |
| NbNi-05Mat.tdb | 1548.15 | BCC_A2 (x(Ni) 0.0685) + MU_D85 (x(Ni) 0.43437) + LIQUID (x(Ni) 0.49817) |
| NbNi-05Mat.tdb | 1428.15 | MU_D85 (x(Ni) 0.48086) + LIQUID (x(Ni) 0.58274) + NBNI3_D0A (x(Ni) 0.71939) |
| NbNi-05Mat.tdb | 463.65 | BCC_A2 (x(Ni) 0.00295) + MU_D85 (x(Ni) 0.47433) + NBNI3_D0A (x(Ni) 0.74874) |
| NbNi-06Che-orig.tdb | 1564.13 | BCC_A2 (x(Ni) 0.04793) + MU_D85 (x(Ni) 0.41335) + LIQUID (x(Ni) 0.46621) |
| NbNi-06Che-orig.tdb | 1557.11 | NBNI3_D0A (x(Ni) 0.7605) + LIQUID (x(Ni) 0.85106) + FCC_A1 (x(Ni) 0.88166) |
| NbNi-06Che-orig.tdb | 1458.42 | MU_D85 (x(Ni) 0.48422) + LIQUID (x(Ni) 0.58079) + NBNI3_D0A (x(Ni) 0.73349) |
| NbNi-06Che-orig.tdb | 787.94 | NBNI3_D0A (x(Ni) 0.75789) + NBNI8 (x(Ni) 0.88889) + FCC_A1 (x(Ni) 0.94756) |
| NbNi-06Che-orig.tdb | 787.94 | NBNI3_D0A (x(Ni) 0.75789) + NBNI8 (x(Ni) 0.88889) + FCC_A1 (x(Ni) 0.94758) |
| NbNi-06Che.tdb | 1572.37 | BCC_A2 (x(Ni) 0.04749) + MU_D85 (x(Ni) 0.42197) + LIQUID (x(Ni) 0.46492) |
| NbNi-06Che.tdb | 1557.11 | NBNI3_D0A (x(Ni) 0.7605) + LIQUID (x(Ni) 0.85106) + FCC_A1 (x(Ni) 0.88166) |
| NbNi-06Che.tdb | 1459.5 | MU_D85 (x(Ni) 0.48205) + LIQUID (x(Ni) 0.58131) + NBNI3_D0A (x(Ni) 0.73365) |
| NbNi-06Che.tdb | 787.94 | NBNI3_D0A (x(Ni) 0.75789) + NBNI8 (x(Ni) 0.88889) + FCC_A1 (x(Ni) 0.94756) |
| NbNi-06Che.tdb | 787.94 | NBNI3_D0A (x(Ni) 0.75789) + NBNI8 (x(Ni) 0.88889) + FCC_A1 (x(Ni) 0.94758) |
| NbNi-20Zho.tdb | 1591.29 | BCC_A2 (x(Ni) 0.05329) + MU_D85 (x(Ni) 0.4481) + LIQUID (x(Ni) 0.46108) |
| NbNi-20Zho.tdb | 1557.49 | NBNI3_D0A (x(Ni) 0.75702) + LIQUID (x(Ni) 0.8398) + FCC_A1 (x(Ni) 0.85795) |
| NbNi-20Zho.tdb | 1453.98 | MU_D85 (x(Ni) 0.51176) + LIQUID (x(Ni) 0.60276) + NBNI3_D0A (x(Ni) 0.72891) |
| NbNi-20Zho.tdb | 791.08 | NBNI3_D0A (x(Ni) 0.75541) + NBNI8 (x(Ni) 0.88889) + FCC_A1 (x(Ni) 0.93995) |
| NbNi-20Zho.tdb | 791.08 | NBNI3_D0A (x(Ni) 0.7554) + NBNI8 (x(Ni) 0.88889) + FCC_A1 (x(Ni) 0.93997) |
| NbNi-23Sun.tdb | 1561.39 | BCC_A2 (x(Ni) 0.04476) + MU_D85 (x(Ni) 0.41265) + LIQUID (x(Ni) 0.49151) |
| NbNi-23Sun.tdb | 1550.33 | NBNI3_D0A (x(Ni) 0.76232) + LIQUID (x(Ni) 0.83755) + FCC_A1 (x(Ni) 0.86301) |
| NbNi-23Sun.tdb | 1458.51 | MU_D85 (x(Ni) 0.51626) + LIQUID (x(Ni) 0.60078) + NBNI3_D0A (x(Ni) 0.72793) |
| NbNi-23Sun.tdb | 799.7 | NBNI3_D0A (x(Ni) 0.75915) + NBNI8 (x(Ni) 0.88889) + FCC_A1 (x(Ni) 0.91608) |
| NbNi-23Sun.tdb | 799.7 | NBNI3_D0A (x(Ni) 0.75915) + NBNI8 (x(Ni) 0.88889) + FCC_A1 (x(Ni) 0.91609) |
| NbNi-96Bol-LB.tdb | 1568 | BCC_A2 (x(Ni) 0.04223) + MU_D85 (x(Ni) 0.44691) + LIQUID (x(Ni) 0.49106) |
| NbNi-96Bol-LB.tdb | 1555.01 | NBNI3_D0A (x(Ni) 0.77269) + LIQUID (x(Ni) 0.85186) + FCC_A1 (x(Ni) 0.87575) |
| NbNi-96Bol-LB.tdb | 1448 | MU_D85 (x(Ni) 0.4943) + LIQUID (x(Ni) 0.59118) + NBNI3_D0A (x(Ni) 0.7251) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/NB/NB-NI.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/NB/NB-NI.json) · [CALPHAD hull NbNi-04Jou](https://data.orchid-project.org/hulls/calphad-sgte/NB/NB-NI--NbNi-04Jou.json) · [CALPHAD hull NbNi-05Mat](https://data.orchid-project.org/hulls/calphad-sgte/NB/NB-NI--NbNi-05Mat.json) · [CALPHAD hull NbNi-20Zho](https://data.orchid-project.org/hulls/calphad-sgte/NB/NB-NI--NbNi-20Zho.json) · [CALPHAD hull NbNi-96Bol-LB](https://data.orchid-project.org/hulls/calphad-sgte/NB/NB-NI--NbNi-96Bol-LB.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Nb–Ni system (76)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1677.15 | congruent melting: Liq. -> Ni3Nb | Liq.: Nb 0.25, Ni 0.75; Ni3Nb: Nb 0.25, Ni 0.75 | experimental | [1] Zhou 2020; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table VII, p. 14, row 9; `ORC-V7SXB36PJP` |  |
| 1676.15 | congruent melting: Liq. -> Ni3Nb | Liq.: Nb 0.25; Ni3Nb: Nb 0.25 | experimental | [1] Zhou 2020; _cites Pogodin 1941_ | Table VII, p. 14, row 7; `ORC-W5YLUOLCZE` |  |
| 1675.15 | congruent melting: Liq. -> Ni3Nb | Liq.: Nb 0.25; Ni3Nb: Nb 0.25 | model | [1] Zhou 2020 | Table VII, p. 14, row 6; `ORC-7T6YBVQHXO` |  |
| 1675.15 | congruent melting: Liq. -> Ni3Nb | Liq.: Nb 0.25; Ni3Nb: Nb 0.25 | experimental | [1] Zhou 2020; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table VII, p. 14, row 8; `ORC-IOFTZTEYEU` |  |
| 1675 | congruent melting: L \<-> Ni3Nb | L: Nb 0.249; Ni3Nb: Nb 0.249 | model | [2] Bolcavage 1996 | Table 3, p. 6, row 1; `ORC-2Q2OV6KFET` |  |
| 1675 | congruent melting: L \<-> Ni3Nb | L: Nb 0.25; Ni3Nb: Nb 0.25 | experimental | [2] Bolcavage 1996; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 3, p. 6, row 2; `ORC-JJE2YBGMPT` |  |
| 1672 | congruent melting: L \<-> Ni3Nb | L: Nb 0.252; Ni3Nb: Nb 0.252 | model | [2] Bolcavage 1996; _cites ref. 92Kej1_ | Table 3, p. 6, row 3; `ORC-M6CSVEMNY2` |  |
| 1580.15 | Liq. + bcc(Nb) -> NiNb | Liq.: Nb 0.537; bcc(Nb): Nb 0.946; NiNb: Nb 0.556 | model | [1] Zhou 2020 | Table VII, p. 14, row 14; `ORC-CMDOLNWMUX` |  |
| 1577.15 | peritectic: L + bcc -> µ |  | experimental | [3] Chen 2006; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table 4, p. 7, row 19; `ORC-RXZ7STK6AL` |  |
| 1577 | peritectic: Liquid + BCC ↔ μ-Nb7Ni6 | μ-Nb7Ni6: Ni 0.461538 | experimental | [4] Sun 2023; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table 7, p. 34, row 18; `ORC-AVRLYHFUO5` |  |
| 1575.15 | Liq. + bcc(Nb) -> NiNb | NiNb: Nb 0.5, Ni 0.5 | experimental | [1] Zhou 2020; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table VII, p. 14, row 16; `ORC-QGERH5SBD3` |  |
| 1568.15 | peritectic: L + bcc -> µ | L: Ni 0.5; bcc: Ni 0.46; µ: Ni 0.045 | experimental | [3] Chen 2006; _cites Ardell 1994_ | Table 4, p. 7, row 17; `ORC-EF3SC5T6AL` |  |
| 1568.15 | Liq. + bcc(Nb) -> NiNb | Liq.: Nb 0.5; bcc(Nb): Nb 0.955; NiNb: Nb 0.54 | experimental | [1] Zhou 2020; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table VII, p. 14, row 15; `ORC-Y6NTTAWOJN` |  |
| 1568 | peritectic: L \<-> μ + bcc(Nb) | L: Nb 0.509; μ: Nb 0.553; bcc(Nb): Nb 0.958 | model | [2] Bolcavage 1996 | Table 3, p. 6, row 10; `ORC-7Z6UYLATM4` |  |
| 1568 | peritectic: Liquid + BCC ↔ μ-Nb7Ni6 | Liquid: Ni 0.5; BCC: Ni 0.045; μ-Nb7Ni6: Ni 0.46 | experimental | [4] Sun 2023; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 7, p. 34, row 17; `ORC-AUPHKDPRSU` |  |
| 1568 | peritectic: Liq -> µ + bcc |  | experimental | [5] Joubert 2004; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 3, p. 5, row 10; `ORC-EN5OEQUBEP` |  |
| 1568 | peritectic: L \<-> μ + bcc(Nb) | L: Nb 0.5; μ: Nb 0.54; bcc(Nb): Nb 0.955 | experimental | [2] Bolcavage 1996; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 3, p. 6, row 11; `ORC-LOXTL3EENY` |  |
| 1564.15 | eutectic: L -> fcc + NbNi3 | NbNi3: Ni 0.75 | model | [3] Chen 2006; _cites Joubert 2004_ [doi](https://doi.org/10.1016/j.calphad.2004.09.004) | Table 4, p. 7, row 4; `ORC-TLM6LMZUOB` |  |
| 1564 | peritectic: L \<-> μ + bcc(Nb) | L: Nb 0.534; μ: Nb 0.545; bcc(Nb): Nb 0.956 | model | [2] Bolcavage 1996; _cites ref. 92Kej1_ | Table 3, p. 6, row 12; `ORC-5F3JAS5UVQ` |  |
| 1564 | eutectic: Liq -> fcc + NbNi3 | NbNi3: Ni 0.75 | model | [5] Joubert 2004 | Table 3, p. 5, row 5; `ORC-HLPVVTHKTY` |  |
| 1563.15 | peritectic: L + bcc -> µ | L: Ni 0.47; bcc: Ni 0.412; µ: Ni 0.047 | model | [3] Chen 2006 | Table 4, p. 7, row 21; `ORC-JRC2LQT24Z` |  |
| 1563.15 | peritectic: L + bcc -> µ |  | model | [3] Chen 2006; _cites Joubert 2004_ [doi](https://doi.org/10.1016/j.calphad.2004.09.004) | Table 4, p. 7, row 20; `ORC-JZPL7XLFJC` |  |
| 1563.15 | peritectic: L + bcc -> µ |  | experimental | [3] Chen 2006; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 4, p. 7, row 18; `ORC-NWWKAC3GKV` |  |
| 1563 | peritectic: Liquid + BCC ↔ μ-Nb7Ni6 | Liquid: Ni 0.47; BCC: Ni 0.047; μ-Nb7Ni6: Ni 0.412 | model | [4] Sun 2023; _cites Chen 2006_ [doi](https://doi.org/10.1016/j.calphad.2006.02.005) | Table 7, p. 34, row 16; `ORC-4RP74VSX7U` |  |
| 1563 | peritectic: Liq -> µ + bcc |  | model | [5] Joubert 2004 | Table 3, p. 5, row 9; `ORC-WZ5VFLYSOU` |  |
| 1561 | peritectic: Liquid + BCC ↔ μ-Nb7Ni6 | Liquid: Ni 0.492; BCC: Ni 0.041; μ-Nb7Ni6: Ni 0.413 | model | [4] Sun 2023 | Table 7, p. 34, row 15; `ORC-5HGA6M3TOP` |  |
| 1560 | eutectic: L \<-> fcc(Ni) + Ni3Nb | L: Nb 0.155; fcc(Ni): Nb 0.123; Ni3Nb: Nb 0.238 | model | [2] Bolcavage 1996; _cites ref. 92Kej1_ | Table 3, p. 6, row 6; `ORC-QYS4G5L4IE` |  |
| 1558.15 | eutectic: Liq. -> fcc(Ni) + Ni3Nb | Ni3Nb: Nb 0.25, Ni 0.75 | experimental | [1] Zhou 2020; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table VII, p. 14, row 5; `ORC-5ZE4GQYKTA` |  |
| 1558.15 | eutectic: L -> fcc + NbNi3 | NbNi3: Ni 0.75 | experimental | [3] Chen 2006; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 4, p. 7, row 2; `ORC-7FCW2C2PSM` |  |
| 1558.15 | eutectic: Liq. -> fcc(Ni) + Ni3Nb | Liq.: Nb 0.16; fcc(Ni): Nb 0.142; Ni3Nb: Nb 0.243 | model | [1] Zhou 2020 | Table VII, p. 14, row 1; `ORC-T5554VWNV6` |  |
| 1558.15 | eutectic: L -> fcc + NbNi3 | NbNi3: Ni 0.75 | experimental | [3] Chen 2006; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table 4, p. 7, row 3; `ORC-UIJBKAUNJN` |  |
| 1558 | eutectic: Liquid ↔ FCC + δ-NbNi3 | δ-NbNi3: Ni 0.75 | experimental | [4] Sun 2023; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table 7, p. 34, row 4; `ORC-TXLSZ6GN3L` |  |
| 1557.15 | eutectic: L -> fcc + NbNi3 | L: Ni 0.851; fcc: Ni 0.873; NbNi3: Ni 0.759 | model | [3] Chen 2006 | Table 4, p. 7, row 5; `ORC-UYYAFLUB7N` |  |
| 1557 | eutectic: Liquid ↔ FCC + δ-NbNi3 | Liquid: Ni 0.851; FCC: Ni 0.873; δ-NbNi3: Ni 0.759 | model | [4] Sun 2023; _cites Chen 2006_ [doi](https://doi.org/10.1016/j.calphad.2006.02.005) | Table 7, p. 34, row 2; `ORC-SQ437WS6FP` |  |
| 1555.15 | eutectic: Liq. -> fcc(Ni) + Ni3Nb | Liq.: Nb 0.16; fcc(Ni): Nb 0.127; Ni3Nb: Nb 0.226 | experimental | [1] Zhou 2020; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table VII, p. 14, row 4; `ORC-5YA3DKFXJU` |  |
| 1555.15 | eutectic: L -> fcc + NbNi3 | L: Ni 0.84; fcc: Ni 0.873; NbNi3: Ni 0.774 | experimental | [3] Chen 2006; _cites Ardell 1994_ | Table 4, p. 7, row 1; `ORC-SY5XZQWV4G` |  |
| 1555 | eutectic: L \<-> fcc(Ni) + Ni3Nb | L: Nb 0.16; fcc(Ni): Nb 0.127; Ni3Nb: Nb 0.226 | experimental | [2] Bolcavage 1996; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 3, p. 6, row 5; `ORC-2UOLPXJ4ND` |  |
| 1555 | eutectic: Liquid ↔ FCC + δ-NbNi3 | Liquid: Ni 0.84; FCC: Ni 0.873; δ-NbNi3: Ni 0.774 | experimental | [4] Sun 2023; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 7, p. 34, row 3; `ORC-JEZHJXTUKT` |  |
| 1555 | eutectic: L \<-> fcc(Ni) + Ni3Nb | L: Nb 0.148; fcc(Ni): Nb 0.124; Ni3Nb: Nb 0.227 | model | [2] Bolcavage 1996 | Table 3, p. 6, row 4; `ORC-QB7RL3FJ7L` |  |
| 1555 | eutectic: Liq -> fcc + NbNi3 | NbNi3: Ni 0.75 | experimental | [5] Joubert 2004; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 3, p. 5, row 6; `ORC-YK5LYRA34G` |  |
| 1550 | eutectic: Liquid ↔ FCC + δ-NbNi3 | Liquid: Ni 0.838; FCC: Ni 0.863; δ-NbNi3: Ni 0.762 | model | [4] Sun 2023 | Table 7, p. 34, row 1; `ORC-APHKKE7VY2` |  |
| 1543.15 | eutectic: Liq. -> fcc(Ni) + Ni3Nb | Liq.: Nb 0.162; Ni3Nb: Nb 0.25, Ni 0.75 | experimental | [1] Zhou 2020; _cites Pogodin 1941_ | Table VII, p. 14, row 3; `ORC-6P5D5LRWU2` |  |
| 1538.15 | eutectic: Liq. -> fcc(Ni) + Ni3Nb | Ni3Nb: Nb 0.25, Ni 0.75 | experimental | [1] Zhou 2020; _cites Grube 1939_ | Table VII, p. 14, row 2; `ORC-QDOEPJX5QE` |  |
| 1459 | eutectic: Liquid ↔ δ-NbNi3 + μ-Nb7Ni6 | Liquid: Ni 0.601; δ-NbNi3: Ni 0.728; μ-Nb7Ni6: Ni 0.516 | model | [4] Sun 2023 | Table 7, p. 34, row 10; `ORC-Y5FIORLKYJ` |  |
| 1457.15 | eutectic: L -> NbNi3 + µ | L: Ni 0.585; NbNi3: Ni 0.735; µ: Ni 0.5 | model | [3] Chen 2006 | Table 4, p. 7, row 16; `ORC-K26XW6CZXR` |  |
| 1457 | eutectic: Liquid ↔ δ-NbNi3 + μ-Nb7Ni6 | Liquid: Ni 0.585; δ-NbNi3: Ni 0.735; μ-Nb7Ni6: Ni 0.5 | model | [4] Sun 2023; _cites Chen 2006_ [doi](https://doi.org/10.1016/j.calphad.2006.02.005) | Table 7, p. 34, row 11; `ORC-74HHO5HDPQ` |  |
| 1454.15 | eutectic: L -> NbNi3 + µ | NbNi3: Ni 0.75 | model | [3] Chen 2006; _cites Joubert 2004_ [doi](https://doi.org/10.1016/j.calphad.2004.09.004) | Table 4, p. 7, row 15; `ORC-5TPNLHXK5S` |  |
| 1454 | eutectic: Liq -> NbNi3 + µ | NbNi3: Ni 0.75 | model | [5] Joubert 2004 | Table 3, p. 5, row 7; `ORC-Y3U6A67U3N` |  |
| 1453.15 | eutectic: Liq. -> Ni3Nb + NiNb | Liq.: Nb 0.398; Ni3Nb: Nb 0.271; NiNb: Nb 0.487 | model | [1] Zhou 2020 | Table VII, p. 14, row 10; `ORC-4JCVH3VSGM` |  |
| 1453.15 | eutectic: L -> NbNi3 + µ | NbNi3: Ni 0.75 | experimental | [3] Chen 2006; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table 4, p. 7, row 14; `ORC-5NXHRVYNPA` |  |
| 1453.15 | eutectic: Liq. -> Ni3Nb + NiNb | Ni3Nb: Nb 0.25, Ni 0.75; NiNb: Nb 0.5, Ni 0.5 | experimental | [1] Zhou 2020; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table VII, p. 14, row 13; `ORC-6Y6F7DB7IG` |  |
| 1453 | eutectic: Liquid ↔ δ-NbNi3 + μ-Nb7Ni6 | δ-NbNi3: Ni 0.75; μ-Nb7Ni6: Ni 0.461538 | experimental | [4] Sun 2023; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table 7, p. 34, row 14; `ORC-JLHOS2A4AS` |  |
| 1451 | eutectic: L \<-> Ni3Nb + μ | L: Nb 0.405; Ni3Nb: Nb 0.279; μ: Nb 0.496 | model | [2] Bolcavage 1996; _cites ref. 92Kej1_ | Table 3, p. 6, row 9; `ORC-RB4VQUKS3I` |  |
| 1448.15 | eutectic: L -> NbNi3 + µ | NbNi3: Ni 0.75 | experimental | [3] Chen 2006; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 4, p. 7, row 12; `ORC-5DGXAMIRGT` |  |
| 1448.15 | eutectic: L -> NbNi3 + µ | L: Ni 0.595; NbNi3: Ni 0.725; µ: Ni 0.5 | experimental | [3] Chen 2006; _cites Ardell 1994_ | Table 4, p. 7, row 11; `ORC-GWIHKXT6UP` |  |
| 1448.15 | eutectic: Liq. -> Ni3Nb + NiNb | Liq.: Nb 0.405; Ni3Nb: Nb 0.275; NiNb: Nb 0.5 | experimental | [1] Zhou 2020; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table VII, p. 14, row 12; `ORC-OPUCNV6TG7` |  |
| 1448.15 | eutectic: L -> NbNi3 + µ | NbNi3: Ni 0.75 | experimental | [3] Chen 2006; _cites Pogodin 1941_ | Table 4, p. 7, row 13; `ORC-OZ4IGE6ICW` |  |
| 1448.15 | eutectic: Liq. -> Ni3Nb + NiNb | Liq.: Nb 0.402; Ni3Nb: Nb 0.25, Ni 0.75; NiNb: Nb 0.5, Ni 0.5 | experimental | [1] Zhou 2020; _cites Pogodin 1941_ | Table VII, p. 14, row 11; `ORC-PDLRZMLHV2` |  |
| 1448 | eutectic: Liq -> NbNi3 + µ | NbNi3: Ni 0.75 | experimental | [5] Joubert 2004; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 3, p. 5, row 8; `ORC-4TZDTWZOSW` |  |
| 1448 | eutectic: L \<-> Ni3Nb + μ | L: Nb 0.409; Ni3Nb: Nb 0.275; μ: Nb 0.506 | model | [2] Bolcavage 1996 | Table 3, p. 6, row 7; `ORC-7AEJ52TBJZ` |  |
| 1448 | eutectic: L \<-> Ni3Nb + μ | L: Nb 0.405; Ni3Nb: Nb 0.275; μ: Nb 0.5 | experimental | [2] Bolcavage 1996; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 3, p. 6, row 8; `ORC-DJHUCFA65Q` |  |
| 1448 | eutectic: Liquid ↔ δ-NbNi3 + μ-Nb7Ni6 | δ-NbNi3: Ni 0.75; μ-Nb7Ni6: Ni 0.461538 | experimental | [4] Sun 2023; _cites Pogodin 1941_ | Table 7, p. 34, row 13; `ORC-OXHYOUAFQ4` |  |
| 1448 | eutectic: Liquid ↔ δ-NbNi3 + μ-Nb7Ni6 | Liquid: Ni 0.595; δ-NbNi3: Ni 0.725; μ-Nb7Ni6: Ni 0.5 | experimental | [4] Sun 2023; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 7, p. 34, row 12; `ORC-TZ2NK2AG5X` |  |
| 810 | peritectoid: NbNi8 -> fcc + NbNi3 | NbNi8: Ni 0.888889; NbNi3: Ni 0.75 | model | [5] Joubert 2004 | Table 3, p. 5, row 3; `ORC-GNHCJUJ7MR` |  |
| 808.15 | fcc(Ni) + Ni3Nb -> Ni8Nb | Ni3Nb: Nb 0.25, Ni 0.75; Ni8Nb: Nb 0.111111, Ni 0.888889 | experimental | [1] Zhou 2020; _cites C 1971_ | Table VII, p. 14, row 18; `ORC-6XSLWX7LUB` |  |
| 808.15 | peritectoid: Fcc + NbNi3 -> NbNi8 | NbNi3: Ni 0.75; NbNi8: Ni 0.888889 | experimental | [3] Chen 2006; _cites Wekken 1971_ [doi](https://doi.org/10.1179/030634571790439487) | Table 4, p. 7, row 22; `ORC-WGQCPYT4L5` |  |
| 808 | peritectoid: NbNi8 -> fcc + NbNi3 | NbNi8: Ni 0.888889; NbNi3: Ni 0.75 | experimental | [5] Joubert 2004; _cites C 1971_ | Table 3, p. 5, row 4; `ORC-LPWA4XJUSH` |  |
| 808 | peritectic: FCC + δ-NbNi3 ↔ NbNi8 | δ-NbNi3: Ni 0.75; NbNi8: Ni 0.888889 | experimental | [4] Sun 2023; _cites C 1971_ | Table 7, p. 34, row 21; `ORC-TPSDOQZNVA` |  |
| 806.15 | peritectoid: Fcc + NbNi3 -> NbNi8 | NbNi3: Ni 0.75; NbNi8: Ni 0.888889 | model | [3] Chen 2006; _cites Joubert 2004_ [doi](https://doi.org/10.1016/j.calphad.2004.09.004) | Table 4, p. 7, row 24; `ORC-SDEG3BPTDQ` |  |
| 800 | peritectic: FCC + δ-NbNi3 ↔ NbNi8 | FCC: Ni 0.9161; δ-NbNi3: Ni 0.759; NbNi8: Ni 0.889 | model | [4] Sun 2023 | Table 7, p. 34, row 19; `ORC-DYQDWA23PX` |  |
| 788.15 | fcc(Ni) + Ni3Nb -> Ni8Nb | fcc(Ni): Nb 0.06; Ni3Nb: Nb 0.245; Ni8Nb: Nb 0.111 | model | [1] Zhou 2020 | Table VII, p. 14, row 17; `ORC-6CDNC5QQQO` |  |
| 788.15 | peritectoid: Fcc + NbNi3 -> NbNi8 | NbNi3: Ni 0.75; NbNi8: Ni 0.888889 | model | [3] Chen 2006 | Table 4, p. 7, row 25; `ORC-GCHYAK7CS3` |  |
| 788.15 | fcc(Ni) + Ni3Nb -> Ni8Nb | Ni3Nb: Nb 0.25, Ni 0.75; Ni8Nb: Nb 0.111111, Ni 0.888889 | experimental | [1] Zhou 2020; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table VII, p. 14, row 19; `ORC-GEEPIN2LGC` |  |
| 788.15 | peritectoid: Fcc + NbNi3 -> NbNi8 | NbNi3: Ni 0.75; NbNi8: Ni 0.888889 | experimental | [3] Chen 2006; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table 4, p. 7, row 23; `ORC-K75THPNOW7` |  |
| 788 | peritectic: FCC + δ-NbNi3 ↔ NbNi8 | δ-NbNi3: Ni 0.75; NbNi8: Ni 0.888889 | experimental | [4] Sun 2023; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table 7, p. 34, row 22; `ORC-6EVNHL4YVY` |  |
| 788 | peritectic: FCC + δ-NbNi3 ↔ NbNi8 | FCC: Ni 0.948; δ-NbNi3: Ni 0.758; NbNi8: Ni 0.889 | model | [4] Sun 2023; _cites Chen 2006_ [doi](https://doi.org/10.1016/j.calphad.2006.02.005) | Table 7, p. 34, row 20; `ORC-7V5IMWMZN6` |  |

## 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, Nb–Ni system (45)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| D0_22 |  | -62.279 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 18; `ORC-SY7Q6SEEPP.926343` |  |
| D0_22 |  | -62 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 18; `ORC-SY7Q6SEEPP.a8df24` |  |
| D0_22 |  | -55.726 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 18; `ORC-SY7Q6SEEPP.0e1748` |  |
| D0_22 |  | 5.84 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 21; `ORC-MGBULPOR2J.a2cbec` |  |
| D0_22 |  | 8.025 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 21; `ORC-MGBULPOR2J.a025c3` |  |
| D0_22 |  | 102 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 21; `ORC-MGBULPOR2J.0f2aef` |  |
| D0_a |  | -141.202 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 9; `ORC-GJ7D7EX7R4.ebfb18` |  |
| D0_a |  | -127.831 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 9; `ORC-GJ7D7EX7R4.c60d12` |  |
| D0_a |  | -121.261 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 9; `ORC-GJ7D7EX7R4.30d461` |  |
| D0_a |  | 5.627 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 12; `ORC-AG5VOVX6O7.9e3b9a` |  |
| D0_a |  | 7.811 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 12; `ORC-AG5VOVX6O7.48a279` |  |
| D0_a |  | 181.202 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 12; `ORC-AG5VOVX6O7.99b732` |  |
| D8_5 |  | -312.098 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 3; `ORC-PNE2DCCEBG.c1a28e` |  |
| D8_5 |  | -295.532 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 3; `ORC-PNE2DCCEBG.83938f` |  |
| D8_5 |  | -280.241 kJ/mol (basis unstated) | 0 | unspecified |  |  | [6] Mathon 2009 | Table 2, p. 10, row 3; `ORC-PNE2DCCEBG.18296f` |  |
| Nb7Ni6 | [Nb7Ni6](https://data.orchid-project.org/compounds/Nb7Ni6.html) | -23 kJ/mol-atom | 298.15 | experimental | -19.894 (mp-aaackvmr) | -19.955 (oqmd-30782) | [7] Santhy 2015; _cites Hultgren 1973_ | Table 6, p. 4, row 3; `ORC-GUSR4DRJTM.dce290` |  |
| Nb7Ni6 | [Nb7Ni6](https://data.orchid-project.org/compounds/Nb7Ni6.html) | -23 kJ/mol-atom ± 3 | 600.15 | experimental | -19.894 (mp-aaackvmr) | -19.955 (oqmd-30782) | [7] Santhy 2015; _cites Kubaschewski 2015_ | Table 6, p. 4, row 2; `ORC-V6DVVRGG5E.11e0a4` |  |
| Nb7Ni6 |  | -22.5 kJ/mol-atom | 0 | DFT |  |  | [7] Santhy 2015 | Table 6, p. 4, row 5; `ORC-LFR5XFEABG.91d157` |  |
| Nb7Ni6 | [Nb7Ni6](https://data.orchid-project.org/compounds/Nb7Ni6.html) | -22.47 kJ/mol-atom ± 2.2 | 298.15 | experimental | -19.894 (mp-aaackvmr) | -19.955 (oqmd-30782) | [7] Santhy 2015; _cites Argent 1959_ | Table 6, p. 4, row 1; `ORC-KNMXYXBOEW.6c652d` |  |
| Nb7Ni6 | [Nb7Ni6](https://data.orchid-project.org/compounds/Nb7Ni6.html) | -20.76 kJ/mol-atom | 298.15 | model | -19.894 (mp-aaackvmr) | -19.955 (oqmd-30782) | [7] Santhy 2015; _cites Niessen 1988_ [doi](https://doi.org/10.1016/0921-4526%2888%2990002-6) | Table 6, p. 4, row 4; `ORC-KD3FJ3WKW4.84d5f6` |  |
| NbNi3 |  | -33.41 kJ/mol-atom |  | DFT |  |  | [7] Santhy 2015; _cites Ravindran 1996_ [doi](https://doi.org/10.1103/physrevb.53.1129) | Table 6, p. 4, row 10; `ORC-CROOJNHYVK.52c640` |  |
| NbNi3 |  | -33.409 kJ/mol (basis unstated) | 298.15 | DFT |  |  | [5] Joubert 2004; _cites Ravindran 1996_ [doi](https://doi.org/10.1103/physrevb.53.1129) | Table 4, p. 5, row 5; `ORC-PHZMG7MKWH` |  |
| NbNi3 | [NbNi3](https://data.orchid-project.org/compounds/NbNi3.html) | -32 kJ/mol-atom | 298.15 | model | -28.233 (mp-aaaaacdv) | -28.755 (oqmd-30781) | [7] Santhy 2015; _cites Niessen 1988_ [doi](https://doi.org/10.1016/0921-4526%2888%2990002-6) | Table 6, p. 4, row 9; `ORC-24DNL2BNUS.80c931` |  |
| NbNi3 | [NbNi3](https://data.orchid-project.org/compounds/NbNi3.html) | -32 kJ/mol-atom ± 2 | 600.15 | experimental | -28.233 (mp-aaaaacdv) | -28.755 (oqmd-30781) | [7] Santhy 2015; _cites Kubaschewski 2015_ | Table 6, p. 4, row 7; `ORC-VJ2BC6W776.4be015` |  |
| NbNi3 | [NbNi3](https://data.orchid-project.org/compounds/NbNi3.html) | -32 kJ/mol-atom | 298.15 | experimental | -28.233 (mp-aaaaacdv) | -28.755 (oqmd-30781) | [7] Santhy 2015; _cites Hultgren 1973_ | Table 6, p. 4, row 8; `ORC-ZI3WR77ALH.34226d` |  |
| NbNi3 |  | -31.714 kJ/mol (basis unstated) ± 2.552 | 298.15 | experimental |  |  | [5] Joubert 2004; _cites Argent 1959_ | Table 4, p. 5, row 4; `ORC-7VHDIGEALK.c13b02` |  |
| NbNi3 | [NbNi3](https://data.orchid-project.org/compounds/NbNi3.html) | -31.71 kJ/mol-atom ± 2.5 | 298.15 | experimental | -28.233 (mp-aaaaacdv) | -28.755 (oqmd-30781) | [7] Santhy 2015; _cites Argent 1959_ | Table 6, p. 4, row 6; `ORC-33IFFGWUUH.08e033` |  |
| NbNi3 |  | -31.2 kJ/mol-atom | 0 | DFT |  |  | [7] Santhy 2015 | Table 6, p. 4, row 11; `ORC-UWMR7VIUSG.009e3a` |  |
| NbNi3 |  | -30.645 kJ/mol (basis unstated) | 298.15 | model |  |  | [5] Joubert 2004 | Table 4, p. 5, row 3; `ORC-JHUFEIXRVQ` |  |
| NbNi8 |  | -14.49 kJ/mol (basis unstated) | 298.15 | model |  |  | [5] Joubert 2004; _cites F 1988_ | Table 4, p. 5, row 2; `ORC-C5JB7OIUD2` |  |
| NbNi8 |  | -14.488 kJ/mol (basis unstated) | 298.15 | model |  |  | [5] Joubert 2004 | Table 4, p. 5, row 1; `ORC-XP5DVI4YZF` |  |
| Ni3Nb | [NbNi3](https://data.orchid-project.org/compounds/NbNi3.html) | -33.925 kJ/mol-atom | 298.15 | model | -28.233 (mp-aaaaacdv) | -28.755 (oqmd-30781) | [2] Bolcavage 1996 | Table 4, p. 8, row 1; `ORC-L6HBAFL7TT` |  |
| Ni3Nb | [NbNi3](https://data.orchid-project.org/compounds/NbNi3.html) | -31.715 kJ/mol-atom ± 2.218 | 298.15 | experimental | -28.233 (mp-aaaaacdv) | -28.755 (oqmd-30781) | [2] Bolcavage 1996; _cites Argent 1959_ | Table 4, p. 8, row 2; `ORC-H6CHGHX5XI` |  |
| δ-NbNi3 | [NbNi3](https://data.orchid-project.org/compounds/NbNi3.html) | -31.71 kJ/mol-atom | 298.15 | experimental | -28.233 (mp-aaaaacdv) | -28.755 (oqmd-30781) | [4] Sun 2023; _cites Argent 1959_ | Table 6, p. 33, row 2; `ORC-MP75CMWX4X.7e46f8` |  |
| δ-NbNi3 |  | -28.51 kJ/mol-atom | 298.15 | DFT |  |  | [4] Sun 2023 | Table 6, p. 33, row 1; `ORC-IOGJOZ7AOF.caffcc` |  |
| δ-NbNi3 |  | -28.38 kJ/mol-atom | 0 | DFT |  |  | [4] Sun 2023 | Table 6, p. 33, row 1; `ORC-IOGJOZ7AOF.bba44e` |  |
| μ |  | -22.468 kJ/mol (basis unstated) ± 2.218 | 298.15 | experimental |  |  | [5] Joubert 2004; _cites Argent 1959_ | Table 4, p. 5, row 7; `ORC-ANQNYSIMPU.f40d80` |  |
| μ |  | -20.761 kJ/mol (basis unstated) | 298.15 | model |  |  | [5] Joubert 2004 | Table 4, p. 5, row 6; `ORC-LN3GRFSO4P` |  |
| μ-Nb7Ni6 + µ-Nb7Ni6 | [Nb7Ni6](https://data.orchid-project.org/compounds/Nb7Ni6.html) | -22.45 kJ/mol-atom | 298.15 | experimental | -19.894 (mp-aaackvmr) | -19.955 (oqmd-30782) | [4] Sun 2023; _cites Argent 1959_ | Table 6, p. 33, row 5; `ORC-J7U4WVA25P.53a2b3` |  |
| μ-Nb7Ni6 + µ-Nb7Ni6 |  | -20.63 kJ/mol-atom | 0 | DFT |  |  | [4] Sun 2023 | Table 6, p. 33, row 3; `ORC-KDDHYBPV3V.1f1c2c` |  |
| μ-Nb7Ni6 + µ-Nb7Ni6 |  | -20.5 kJ/mol-atom | 0 | DFT |  |  | [4] Sun 2023 | Table 6, p. 33, row 4; `ORC-UZM6JPBUE2.c22fe6` |  |
| μ-Nb7Ni6 + µ-Nb7Ni6 |  | -20.43 kJ/mol-atom | 298.15 | DFT |  |  | [4] Sun 2023 | Table 6, p. 33, row 4; `ORC-UZM6JPBUE2.b2325a` |  |
| μ-Nb7Ni6 + µ-Nb7Ni6 |  | -20.38 kJ/mol-atom | 298.15 | DFT |  |  | [4] Sun 2023 | Table 6, p. 33, row 3; `ORC-KDDHYBPV3V.9e54ef` |  |
| μNi7Nb6 | [Nb6Ni7](https://data.orchid-project.org/compounds/Nb6Ni7.html) | -22.468 kJ/mol-atom ± 2.552 | 298.15 | experimental | -20.338 (mp-aaackwrs) | -20.518 (oqmd-1791808) | [2] Bolcavage 1996; _cites Argent 1959_ | Table 4, p. 8, row 4; `ORC-U452T4WI3O` |  |
| μNi7Nb6 | [Nb6Ni7](https://data.orchid-project.org/compounds/Nb6Ni7.html) | -21.596 kJ/mol-atom | 298.15 | model | -20.338 (mp-aaackwrs) | -20.518 (oqmd-1791808) | [2] Bolcavage 1996 | Table 4, p. 8, row 3; `ORC-2CIIM2LOVO` |  |

## Other properties

### Phase transition (12)

Table: Phase transition, Nb–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1671 K | 1671 | congruent melting: Liq -> NbNi3; _L: Ni 0.75; NbNi3: Ni 0.75_ | model | [5] Joubert 2004 | Table 3, p. 5, row 1; `ORC-LT2JBLTB2P` |  |
| Phase transition | 1671.15 K | 1671.15 | congruent melting: L -> NbNi3; _L: Ni 0.75; NbNi3: Ni 0.75_ | model | [3] Chen 2006; _cites Joubert 2004_ [doi](https://doi.org/10.1016/j.calphad.2004.09.004) | Table 4, p. 7, row 9; `ORC-M5IWA6U4WH` |  |
| Phase transition | 1672 K | 1672 | congruent melting: Liquid ↔ δ-NbNi3; _Liquid: Ni 0.75; δ-NbNi3: Ni 0.75_ | model | [4] Sun 2023; _cites Chen 2006_ [doi](https://doi.org/10.1016/j.calphad.2006.02.005) | Table 7, p. 34, row 6; `ORC-RMXE5IDFRT` |  |
| Phase transition | 1672.15 K | 1672.15 | congruent melting: L -> NbNi3; _L: Ni 0.75; NbNi3: Ni 0.75_ | model | [3] Chen 2006 | Table 4, p. 7, row 10; `ORC-UYERU6HQKX` |  |
| Phase transition | 1675 K | 1675 | congruent melting: Liq -> NbNi3; _L: Ni 0.75; NbNi3: Ni 0.75_ | experimental | [5] Joubert 2004; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 3, p. 5, row 2; `ORC-WQAIPS3TNQ` |  |
| Phase transition | 1675 K | 1675 | congruent melting: Liquid ↔ δ-NbNi3; _Liquid: Ni 0.75; δ-NbNi3: Ni 0.75_ | model | [4] Sun 2023 | Table 7, p. 34, row 5; `ORC-3VJ6PUDLXY` |  |
| Phase transition | 1675 K | 1675 | congruent melting: Liquid ↔ δ-NbNi3; _Liquid: Ni 0.75; δ-NbNi3: Ni 0.75_ | experimental | [4] Sun 2023; _cites Duerden 1966_ [doi](https://doi.org/10.1016/0022-5088%2866%2990083-x) | Table 7, p. 34, row 7; `ORC-XEGEKFKNCD` |  |
| Phase transition | 1675.15 K | 1675.15 | congruent melting: L -> NbNi3; _L: Ni 0.75; NbNi3: Ni 0.75_ | experimental | [3] Chen 2006; _cites Ardell 1994_ | Table 4, p. 7, row 6; `ORC-DRCXZBA4GD` |  |
| Phase transition | 1676 K | 1676 | congruent melting: Liquid ↔ δ-NbNi3; _Liquid: Ni 0.75; δ-NbNi3: Ni 0.75_ | experimental | [4] Sun 2023; _cites Pogodin 1941_ | Table 7, p. 34, row 8; `ORC-LT653MCK27` |  |
| Phase transition | 1676.15 K | 1676.15 | congruent melting: L -> NbNi3; _L: Ni 0.75; NbNi3: Ni 0.75_ | experimental | [3] Chen 2006; _cites Pogodin 1941_ | Table 4, p. 7, row 7; `ORC-XA63AKUUI4` |  |
| Phase transition | 1677 K | 1677 | congruent melting: Liquid ↔ δ-NbNi3; _Liquid: Ni 0.75; δ-NbNi3: Ni 0.75_ | experimental | [4] Sun 2023; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table 7, p. 34, row 9; `ORC-VWGEKXTLZM` |  |
| Phase transition | 1677.15 K | 1677.15 | congruent melting: L -> NbNi3; _L: Ni 0.75; NbNi3: Ni 0.75_ | experimental | [3] Chen 2006; _cites Chen 2005_ [doi](https://doi.org/10.1007/s10853-005-4553-4) | Table 4, p. 7, row 8; `ORC-PSOLU3HRSJ` |  |

### Phase equilibrium (5)

Table: Phase equilibrium, Nb–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase composition |  | 1273 | µ-Nb7Ni6 + µ-Nb7Ni6 site 6c1 + µ-Nb7Ni6 site 6c2 + µ-Nb7Ni6 site 6c3 + µ-Nb7Ni6 site 18h + µ-Nb7Ni6 site 3a; _µ-Nb7Ni6 site 6c1: Nb 0.538462, Ni 0.461538; µ-Nb7Ni6 site 6c2: Nb 1, Ni 0; µ-Nb7Ni6 site 6c3: Nb 1, Ni 0; µ-Nb7Ni6 site 18h: Nb 0.16, Ni 0.84; µ-Nb7Ni6 site 3a: Nb 0.81, Ni 0.19_ | model | [4] Sun 2023 | Table 8, p. 35, row 5; `ORC-74F2TKIZ7O` |  |
| Phase composition |  | 1273 | µ-Nb7Ni6 + µ-Nb7Ni6 site 6c1 + µ-Nb7Ni6 site 6c2 + µ-Nb7Ni6 site 6c3 + µ-Nb7Ni6 site 18h + µ-Nb7Ni6 site 3a; _µ-Nb7Ni6 site 6c1: Nb 0.67, Ni 0.33; µ-Nb7Ni6 site 6c2: Nb 0.85, Ni 0.15; µ-Nb7Ni6 site 6c3: Nb 0.95, Ni 0.05; µ-Nb7Ni6 site 18h: Nb 0.13, Ni 0.87; µ-Nb7Ni6 site 3a: Nb 0.74, Ni 0.26_ | model | [4] Sun 2023 | Table 8, p. 35, row 1; `ORC-BETZVFAVXN` |  |
| Phase composition |  | 1273 | µ-Nb7Ni6 + µ-Nb7Ni6 site 6c1 + µ-Nb7Ni6 site 6c2 + µ-Nb7Ni6 site 6c3 + µ-Nb7Ni6 site 18h + µ-Nb7Ni6 site 3a; _µ-Nb7Ni6 site 6c1: Nb 0.78, Ni 0.22; µ-Nb7Ni6 site 6c2: Nb 0.94, Ni 0.06; µ-Nb7Ni6 site 6c3: Nb 1, Ni 0; µ-Nb7Ni6 site 18h: Nb 0.1, Ni 0.9; µ-Nb7Ni6 site 3a: Nb 0.84, Ni 0.16_ | model | [4] Sun 2023 | Table 8, p. 35, row 3; `ORC-HFKM5XGDCG` |  |
| Phase composition |  | 1273 | µ-Nb7Ni6 + µ-Nb7Ni6 site 6c1 + µ-Nb7Ni6 site 6c2 + µ-Nb7Ni6 site 6c3 + µ-Nb7Ni6 site 18h + µ-Nb7Ni6 site 3a; _µ-Nb7Ni6 site 6c1: Nb 0.89, Ni 0.11; µ-Nb7Ni6 site 6c2: Nb 1, Ni 0; µ-Nb7Ni6 site 6c3: Nb 0.89, Ni 0.11; µ-Nb7Ni6 site 18h: Nb 0.07, Ni 0.93; µ-Nb7Ni6 site 3a: Nb 0.77, Ni 0.23_ | model | [4] Sun 2023 | Table 8, p. 35, row 2; `ORC-M424XOOJW6` |  |
| Phase composition |  | 1273 | µ-Nb7Ni6 + µ-Nb7Ni6 site 6c1 + µ-Nb7Ni6 site 6c2 + µ-Nb7Ni6 site 6c3 + µ-Nb7Ni6 site 18h + µ-Nb7Ni6 site 3a; _µ-Nb7Ni6 site 6c1: Nb 0.85, Ni 0.15; µ-Nb7Ni6 site 6c2: Nb 0.99, Ni 0.01; µ-Nb7Ni6 site 6c3: Nb 1, Ni 0; µ-Nb7Ni6 site 18h: Nb 0.12, Ni 0.88; µ-Nb7Ni6 site 3a: Nb 0.81, Ni 0.19_ | model | [4] Sun 2023 | Table 8, p. 35, row 4; `ORC-RPHJUZVTCP` |  |

### Crystal structure (7)

Table: Crystal structure, Nb–Ni system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Molar volume; _printed: V0_ | 13.91 Å3/atom | 0 | (Co,Ni)Nb; _alloy: Nb 0.461538, Ni 0.538462_ | DFT | [1] Zhou 2020 | Table V, p. 12, row 17; `ORC-24E4DH4W56` |  |
| Molar volume; _printed: V0_ | 13.6 Å3/atom | 0 | (Co,Ni)Nb; _alloy: Nb 0.384615, Ni 0.615385_ | DFT | [1] Zhou 2020 | Table V, p. 12, row 16; `ORC-3EMJ6CDNOS` |  |
| Molar volume; _printed: V0_ | 14.51 Å3/atom | 0 | (Co,Ni)Nb; _alloy: Nb 0.538462, Ni 0.461538_ | DFT | [1] Zhou 2020 | Table V, p. 12, row 18; `ORC-4WYXHUXBKE` |  |
| Molar volume; _printed: V0_ | 12.92 Å3/atom | 0 | (Co,Ni)Nb; _alloy: Nb 0.307692, Ni 0.692308_ | DFT | [1] Zhou 2020 | Table V, p. 12, row 15; `ORC-7ONHFWL6ZB` |  |
| Molar volume; _printed: V0_ | 12.39 Å3/atom | 0 | Ni3Nb; _alloy: Nb 0.25, Ni 0.75_ | DFT | [1] Zhou 2020 | Table V, p. 12, row 10; `ORC-OUQ3UE6244` |  |
| Molar volume; _printed: V0_ | 12.4 Å3/atom | 0 | Ni3Nb; _alloy: Nb 0.25, Ni 0.75_ | DFT | [1] Zhou 2020 | Table V, p. 12, row 9; `ORC-ZNQ5UXUN3L` |  |
| Molar volume; _printed: V0_ | 11.53 Å3/atom | 0 | Ni8Nb; _alloy: Nb 0.111111, Ni 0.888889_ | DFT | [1] Zhou 2020 | Table V, p. 12, row 8; `ORC-XD7WZF2NYH` |  |

## Sources

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

1. Chenyang Zhou, Cuiping Guo, Jingbo Li, Changrong Li, Zhenmin Du, Key Experiments and Thermodynamic Description of the Co-Nb-Ni System, Metall Mater Trans A 51, 5892-5911 (2020). [doi:10.1007/s11661-020-05963-2](https://doi.org/10.1007/s11661-020-05963-2)
2. A. Bolcavage, U. R. Kattner, A reassessment of the calculated Ni-Nb phase diagram, JPE 17, 92-100 (1996). [doi:10.1007/bf02665782](https://doi.org/10.1007/bf02665782)
3. Hailin Chen, Yong Du, Refinement of the thermodynamic modeling of the Nb–Ni system, Calphad 30, 308-315 (2006). [doi:10.1016/j.calphad.2006.02.005](https://doi.org/10.1016/j.calphad.2006.02.005)
4. Hui Sun, Shun-Li Shang, Rushi Gong, Brandon J. Bocklund, Allison M. Beese, Zi-Kui Liu, Thermodynamic modeling of the Nb-Ni system with uncertainty quantification using PyCalphad and ESPEI, Calphad 82, 102563 (2023). [doi:10.1016/j.calphad.2023.102563](https://doi.org/10.1016/j.calphad.2023.102563)
5. J.-M. Joubert, B. Sundman, N. Dupin, Assessment of the niobium–nickel system, Calphad 28, 299-306 (2004). [doi:10.1016/j.calphad.2004.09.004](https://doi.org/10.1016/j.calphad.2004.09.004)
6. 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)
7. K. Santhy, K.C. Hari Kumar, Thermodynamic reassessment of Nb-Ni-Ti system with order–disorder model, Journal of Alloys and Compounds 619, 733-747 (2015). [doi:10.1016/j.jallcom.2014.08.200](https://doi.org/10.1016/j.jallcom.2014.08.200)

## 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/).