# Co–Nb system

> Co–Nb system: 124 accepted literature values (invariant reaction 113, phase transition 10, crystal structure 1) and 4 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

124 accepted literature values from 3 paper(s) (experimental 79, model 44, DFT 1); 4 calculated phase diagram(s). 17 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/CO-NB.json) · [CSV](https://data.orchid-project.org/systems/CO-NB.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CO-NB) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CO-NB/CoNb-15He.json) · [phases (11)](https://data.orchid-project.org/phases/pages/CO-NB.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CO-NB.html) · [Markdown](https://data.orchid-project.org/systems/CO-NB.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 79 |
| model | 44 |
| DFT | 1 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 113 |
| phase transition | 10 |
| crystal structure | 1 |

## 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 |
|---|---|---|---|
| CoNb-15He.tdb | C. He, F. Stein, M. Palm, J. Alloys Compd., 637, 361-75(2015). [doi:10.1016/j.jallcom.2015.02.182](https://doi.org/10.1016/j.jallcom.2015.02.182) | `870ac3d5afa50fc9b15aa65a93b24982f494e509b11c0b2af862d2e6750fa2ee` | [viewer](https://orchid-project.org/phase-diagrams/#CO-NB/CoNb-15He.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoNb-15He.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoNb-15He.json) |
| CoNb-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) | `9a76c67c6bba1992dfb73615a3daf596ca477bf15fa7620db3091a6f65501111` | [viewer](https://orchid-project.org/phase-diagrams/#CO-NB/CoNb-20Zho.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoNb-20Zho.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoNb-20Zho.json) |
| CoNb-22Wei.tdb | D. Wei, X. Bai, C. Guo, C. Li, Z. Du, J. Alloys Compd., 924, 166516(2022). [doi:10.1016/j.jallcom.2022.166516](https://doi.org/10.1016/j.jallcom.2022.166516) | `9d02f9031327c346667ee240eade26f369e95027f857b97859c78bf0399ac0a1` | [viewer](https://orchid-project.org/phase-diagrams/#CO-NB/CoNb-22Wei.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoNb-22Wei.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoNb-22Wei.json) |
| CoNb-98Har-LB.tdb | K.C. Hari Kumar, I. Ansara, P. Wollants, L. Delaye, J. Alloys Compd., 267, 105-12(1998). [doi:10.1016/S0925-8388(97)00465-9](https://doi.org/10.1016/S0925-8388%2897%2900465-9) | `0243c89a99fdd87054fa4ed923826097efec4ab0c3d84b9309feac564d93e41a` | [viewer](https://orchid-project.org/phase-diagrams/#CO-NB/CoNb-98Har-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoNb-98Har-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoNb-98Har-LB.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CoNb-15He.tdb | 1696.18 | C15_LAVES (x(Nb) 0.34716) + C14_LAVES (x(Nb) 0.35998) + LIQUID (x(Nb) 0.41093) |
| CoNb-15He.tdb | 1654.86 | C14_LAVES (x(Nb) 0.37223) + LIQUID (x(Nb) 0.44408) + MU_D85 (x(Nb) 0.4779) |
| CoNb-15He.tdb | 1644.52 | MU_D85 (x(Nb) 0.56446) + LIQUID (x(Nb) 0.59485) + BCC_A2 (x(Nb) 0.9429) |
| CoNb-15He.tdb | 1537.36 | LIQUID (x(Nb) 0.15385) + C36_LAVES (x(Nb) 0.24301) + C15_LAVES (x(Nb) 0.25147) |
| CoNb-15He.tdb | 1511.5 | C15_LAVES (x(Nb) 0.35362) + C14_LAVES (x(Nb) 0.36629) + MU_D85 (x(Nb) 0.47447) |
| CoNb-15He.tdb | 1510.27 | FCC_A1 (x(Nb) 0.05372) + LIQUID (x(Nb) 0.1432) + C36_LAVES (x(Nb) 0.23704) |
| CoNb-15He.tdb | 1358.5 | FCC_A1 (x(Nb) 0.03597) + CO7NB2 (x(Nb) 0.22222) + C36_LAVES (x(Nb) 0.24025) |
| CoNb-15He.tdb | 1358.5 | FCC_A1 (x(Nb) 0.03598) + CO7NB2 (x(Nb) 0.22222) + C36_LAVES (x(Nb) 0.24025) |
| CoNb-15He.tdb | 1302.19 | CO7NB2 (x(Nb) 0.22222) + C36_LAVES (x(Nb) 0.25583) + C15_LAVES (x(Nb) 0.2675) |
| CoNb-15He.tdb | 690.75 | HCP_A3 (x(Nb) 7.000e-5) + FCC_A1 (x(Nb) 5.300e-4) + CO7NB2 (x(Nb) 0.22222) |
| CoNb-15He.tdb | 690.75 | HCP_A3 (x(Nb) 7.000e-5) + FCC_A1 (x(Nb) 5.300e-4) + CO7NB2 (x(Nb) 0.22222) |
| CoNb-20Zho.tdb | 1696.9 | C15_LAVES (x(Nb) 0.34949) + C14_LAVES (x(Nb) 0.3583) + LIQUID (x(Nb) 0.40577) |
| CoNb-20Zho.tdb | 1657.18 | C14_LAVES (x(Nb) 0.37263) + LIQUID (x(Nb) 0.43209) + MU_D85 (x(Nb) 0.48241) |
| CoNb-20Zho.tdb | 1641.54 | MU_D85 (x(Nb) 0.55747) + LIQUID (x(Nb) 0.62663) + BCC_A2 (x(Nb) 0.94206) |
| CoNb-20Zho.tdb | 1537.05 | LIQUID (x(Nb) 0.16365) + C36_LAVES (x(Nb) 0.24637) + C15_LAVES (x(Nb) 0.25058) |
| CoNb-20Zho.tdb | 1525.4 | C15_LAVES (x(Nb) 0.35356) + C14_LAVES (x(Nb) 0.36398) + MU_D85 (x(Nb) 0.48216) |
| CoNb-20Zho.tdb | 1512.04 | FCC_A1 (x(Nb) 0.04913) + LIQUID (x(Nb) 0.15256) + C36_LAVES (x(Nb) 0.24055) |
| CoNb-20Zho.tdb | 1359.01 | FCC_A1 (x(Nb) 0.03455) + CO7NB2 (x(Nb) 0.22222) + C36_LAVES (x(Nb) 0.24423) |
| CoNb-20Zho.tdb | 1359.01 | FCC_A1 (x(Nb) 0.03455) + CO7NB2 (x(Nb) 0.22222) + C36_LAVES (x(Nb) 0.24423) |
| CoNb-20Zho.tdb | 1318.11 | CO7NB2 (x(Nb) 0.22222) + C36_LAVES (x(Nb) 0.25679) + C15_LAVES (x(Nb) 0.26522) |
| CoNb-20Zho.tdb | 688.19 | HCP_A3 (x(Nb) 0) + FCC_A1 (x(Nb) 7.300e-4) + CO7NB2 (x(Nb) 0.22222) |
| CoNb-20Zho.tdb | 688.19 | HCP_A3 (x(Nb) 0) + FCC_A1 (x(Nb) 7.300e-4) + CO7NB2 (x(Nb) 0.22222) |
| CoNb-20Zho.tdb | 688.19 | HCP_A3 (x(Nb) 0) + FCC_A1 (x(Nb) 7.300e-4) + CO7NB2 (x(Nb) 0.22222) |
| CoNb-22Wei.tdb | 1696.89 | C15_LAVES (x(Nb) 0.34778) + C14_LAVES (x(Nb) 0.35947) + LIQUID (x(Nb) 0.40582) |
| CoNb-22Wei.tdb | 1656.21 | C14_LAVES (x(Nb) 0.37375) + LIQUID (x(Nb) 0.43298) + MU_D85 (x(Nb) 0.48206) |
| CoNb-22Wei.tdb | 1637.65 | MU_D85 (x(Nb) 0.55931) + LIQUID (x(Nb) 0.62581) + BCC_A2 (x(Nb) 0.94182) |
| CoNb-22Wei.tdb | 1537.08 | LIQUID (x(Nb) 0.16327) + C36_LAVES (x(Nb) 0.24878) + C15_LAVES (x(Nb) 0.25231) |
| CoNb-22Wei.tdb | 1523.24 | C15_LAVES (x(Nb) 0.35094) + C14_LAVES (x(Nb) 0.36443) + MU_D85 (x(Nb) 0.48186) |
| CoNb-22Wei.tdb | 1511.99 | FCC_A1 (x(Nb) 0.04913) + LIQUID (x(Nb) 0.15258) + C36_LAVES (x(Nb) 0.2448) |
| CoNb-22Wei.tdb | 1359.48 | FCC_A1 (x(Nb) 0.03461) + CO7NB2 (x(Nb) 0.22222) + C36_LAVES (x(Nb) 0.24746) |
| CoNb-22Wei.tdb | 1359.48 | FCC_A1 (x(Nb) 0.03461) + CO7NB2 (x(Nb) 0.22222) + C36_LAVES (x(Nb) 0.24745) |
| CoNb-22Wei.tdb | 1314.07 | CO7NB2 (x(Nb) 0.22222) + C36_LAVES (x(Nb) 0.25743) + C15_LAVES (x(Nb) 0.26372) |
| CoNb-22Wei.tdb | 688.19 | HCP_A3 (x(Nb) 0) + FCC_A1 (x(Nb) 7.300e-4) + CO7NB2 (x(Nb) 0.22222) |
| CoNb-22Wei.tdb | 688.19 | HCP_A3 (x(Nb) 0) + FCC_A1 (x(Nb) 7.300e-4) + CO7NB2 (x(Nb) 0.22222) |
| CoNb-22Wei.tdb | 688.19 | HCP_A3 (x(Nb) 0) + FCC_A1 (x(Nb) 7.300e-4) + CO7NB2 (x(Nb) 0.22222) |
| CoNb-98Har-LB.tdb | 1700.54 | C15_LAVES (x(Nb) 0.33411) + CO16NB9_C14 (x(Nb) 0.36) + LIQUID (x(Nb) 0.42253) |
| CoNb-98Har-LB.tdb | 1700.54 | C15_LAVES (x(Nb) 0.33411) + CO16NB9_C14 (x(Nb) 0.36) + LIQUID (x(Nb) 0.4227) |
| CoNb-98Har-LB.tdb | 1676.02 | CO16NB9_C14 (x(Nb) 0.36) + LIQUID (x(Nb) 0.45004) + MU_D85 (x(Nb) 0.50287) |
| CoNb-98Har-LB.tdb | 1676.02 | CO16NB9_C14 (x(Nb) 0.36) + LIQUID (x(Nb) 0.45048) + MU_D85 (x(Nb) 0.50298) |
| CoNb-98Har-LB.tdb | 1636.67 | MU_D85 (x(Nb) 0.53252) + LIQUID (x(Nb) 0.63288) + BCC_A2 (x(Nb) 0.97019) |
| CoNb-98Har-LB.tdb | 1521.8 | LIQUID (x(Nb) 0.13815) + CO3NB_C36 (x(Nb) 0.25) + C15_LAVES (x(Nb) 0.27146) |
| CoNb-98Har-LB.tdb | 1503.83 | FCC_A1 (x(Nb) 0.05191) + LIQUID (x(Nb) 0.13012) + CO3NB_C36 (x(Nb) 0.25) |
| CoNb-98Har-LB.tdb | 1503.83 | FCC_A1 (x(Nb) 0.05191) + LIQUID (x(Nb) 0.13011) + CO3NB_C36 (x(Nb) 0.25) |
| CoNb-98Har-LB.tdb | 1485.18 | C15_LAVES (x(Nb) 0.33438) + CO16NB9_C14 (x(Nb) 0.36) + MU_D85 (x(Nb) 0.50373) |
| CoNb-98Har-LB.tdb | 1485.18 | C15_LAVES (x(Nb) 0.33438) + CO16NB9_C14 (x(Nb) 0.36) + MU_D85 (x(Nb) 0.50373) |
| CoNb-98Har-LB.tdb | 1313.09 | FCC_A1 (x(Nb) 0.02619) + CO7NB2 (x(Nb) 0.22222) + CO3NB_C36 (x(Nb) 0.25) |
| CoNb-98Har-LB.tdb | 1313.09 | FCC_A1 (x(Nb) 0.02621) + CO7NB2 (x(Nb) 0.22222) + CO3NB_C36 (x(Nb) 0.25) |
| CoNb-98Har-LB.tdb | 1313.09 | FCC_A1 (x(Nb) 0.02624) + CO7NB2 (x(Nb) 0.22222) + CO3NB_C36 (x(Nb) 0.25) |
| CoNb-98Har-LB.tdb | 1277.93 | CO7NB2 (x(Nb) 0.22222) + CO3NB_C36 (x(Nb) 0.25) + C15_LAVES (x(Nb) 0.28652) |
| CoNb-98Har-LB.tdb | 1277.93 | CO7NB2 (x(Nb) 0.22222) + CO3NB_C36 (x(Nb) 0.25) + C15_LAVES (x(Nb) 0.28657) |
| CoNb-98Har-LB.tdb | 694.19 | HCP_A3 (x(Nb) 0) + FCC_A1 (x(Nb) 9.000e-5) + CO7NB2 (x(Nb) 0.22222) |
| CoNb-98Har-LB.tdb | 694.19 | HCP_A3 (x(Nb) 0) + FCC_A1 (x(Nb) 9.000e-5) + CO7NB2 (x(Nb) 0.22222) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CO/CO-NB.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CO/CO-NB.json) · [CALPHAD hull CoNb-15He](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-NB--CoNb-15He.json) · [CALPHAD hull CoNb-20Zho](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-NB--CoNb-20Zho.json) · [CALPHAD hull CoNb-98Har-LB](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-NB--CoNb-98Har-LB.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Co–Nb system (113)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1813.15 | congruent melting: L = C15 |  | experimental | [1] He 2015; _cites Shurin 1964_ | Table 3, p. 6, row 5; `ORC-U5KYOQU6BE` |  |
| 1793.15 | congruent melting: Liq. -> λ2 | Liq.: Nb 0.333; λ2: Nb 0.333 | experimental | [2] Zhou 2020; _cites SK 1970_ | Table VI, p. 13, row 11; `ORC-36VGHIYOJ4` |  |
| 1793.15 | congruent melting: L = C15 | L: Nb 0.333; C15: Nb 0.333 | experimental | [1] He 2015; _cites Bataleva 1970_ | Table 3, p. 6, row 4; `ORC-F6LKGT4TNI` |  |
| 1757.15 | congruent melting: Liq. -> λ2 | Liq.: Nb 0.328; λ2: Nb 0.328 | model | [2] Zhou 2020 | Table VI, p. 13, row 9; `ORC-HGV5AMREJG` |  |
| 1757.15 | congruent melting: Liq. -> λ2 |  | experimental | [2] Zhou 2020; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table VI, p. 13, row 12; `ORC-LCX6HRXPTA` |  |
| 1757.15 | congruent melting: L = C15 | L: Nb 0.333; C15: Nb 0.333 | experimental | [1] He 2015; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table 3, p. 6, row 2; `ORC-SP6HBCT4ZE` |  |
| 1754.15 | congruent melting: L = C15 | L: Nb 0.32; C15: Nb 0.32 | model | [1] He 2015 | Table 3, p. 6, row 1; `ORC-X7U7EGRT5F` |  |
| 1753.15 | congruent melting: Liq. -> λ2 | Liq.: Nb 0.32; λ2: Nb 0.32 | experimental | [2] Zhou 2020; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table VI, p. 13, row 10; `ORC-6PG3WUWNOV` |  |
| 1753.15 | congruent melting: L = C15 | L: Nb 0.32; C15: Nb 0.32 | experimental | [1] He 2015; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 3, p. 6, row 3; `ORC-OQTEGMLQH7` |  |
| 1748.15 | congruent melting: L = Co7Nb6(μ) | L: Nb 0.52; Co7Nb6(μ): Nb 0.52 | experimental | [1] He 2015; _cites Shurin 1964_ | Table 3, p. 6, row 15; `ORC-42MJ2AVZ6T` |  |
| 1748.15 | congruent melting: L = C15 | L: Nb 0.328; C15: Nb 0.328 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 6; `ORC-RJTHR3QTNV` |  |
| 1713.15 | peritectic: Liq + C15 = C14 |  | experimental | [1] He 2015; _cites Shurin 1964_ | Table 3, p. 6, row 10; `ORC-N2N2UZDQJV` |  |
| 1713 | peritectic: λ + liq -> Co16Nb9 | Co16Nb9: Nb 0.36 | experimental | [3] Kumar 1998; _cites Shurin 1964_ | Table 4, p. 7, row 21; `ORC-3LJXJHBZJQ` |  |
| 1703.15 | congruent melting: Liq. -> CoNb | Liq.: Nb 0.517; CoNb: Nb 0.517 | model | [2] Zhou 2020 | Table VI, p. 13, row 20; `ORC-2O5AN4C7II` |  |
| 1703.15 | congruent melting: Liq. -> CoNb | Liq.: Nb 0.51; CoNb: Nb 0.51 | experimental | [2] Zhou 2020; _cites SK 1970_ | Table VI, p. 13, row 22; `ORC-RET4CI5V5Y` |  |
| 1703.15 | congruent melting: L = Co7Nb6(μ) | L: Nb 0.51; Co7Nb6(μ): Nb 0.51 | experimental | [1] He 2015; _cites Bataleva 1970_ | Table 3, p. 6, row 14; `ORC-X22M5DLGCW` |  |
| 1701.15 | peritectic: Liq + C15 = C14 | Liq: Nb 0.423; C15: Nb 0.334; C14: Nb 0.36 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 11; `ORC-JVT6RRNUCS` |  |
| 1701 | peritectic: λ + liq -> Co16Nb9 | λ: Nb 0.334; L: Nb 0.423; Co16Nb9: Nb 0.36 | model | [3] Kumar 1998 | Table 4, p. 7, row 19; `ORC-YRUTD6RS2X` |  |
| 1697.15 | peritectic: Liq + C15 = C14 | Liq: Nb 0.42; C15: Nb 0.345; C14: Nb 0.365 | experimental | [1] He 2015; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table 3, p. 6, row 8; `ORC-B7O7USEIIL` |  |
| 1697.15 | Liq. + λ2 -> λ1 | Liq.: Nb 0.406; λ2: Nb 0.35; λ1: Nb 0.358 | model | [2] Zhou 2020 | Table VI, p. 13, row 13; `ORC-CY2D6NQVRE` |  |
| 1697.15 | congruent melting: L = Co7Nb6(μ) | L: Nb 0.518; Co7Nb6(μ): Nb 0.518 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 16; `ORC-DMSEZOD3P3` |  |
| 1697.15 | Liq. + λ2 -> λ1 | Liq.: Nb 0.42; λ2: Nb 0.345; λ1: Nb 0.365 | experimental | [2] Zhou 2020; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table VI, p. 13, row 15; `ORC-Z7C4FO2HWS` |  |
| 1696.15 | peritectic: Liq + C15 = C14 | Liq: Nb 0.41; C15: Nb 0.347; C14: Nb 0.36 | model | [1] He 2015 | Table 3, p. 6, row 7; `ORC-CKRTW45QIV` |  |
| 1693.15 | Liq. + λ2 -> λ1 | Liq.: Nb 0.47 | experimental | [2] Zhou 2020; _cites SK 1970_ | Table VI, p. 13, row 14; `ORC-UQOSGGMASD` |  |
| 1693.15 | peritectic: Liq + C15 = C14 | Liq: Nb 0.47 | experimental | [1] He 2015; _cites Bataleva 1970_ | Table 3, p. 6, row 9; `ORC-UVGGXSD6D2` |  |
| 1693 | peritectic: λ + liq -> Co16Nb9 | L: Nb 0.47; Co16Nb9: Nb 0.36 | experimental | [3] Kumar 1998; _cites Bataleva 1970_ | Table 4, p. 7, row 20; `ORC-TIRXKNJ57L` |  |
| 1676.15 | eutectic: L = Co7Nb6(μ) + C14 | L: Nb 0.451; Co7Nb6(μ): Nb 0.503; C14: Nb 0.36 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 22; `ORC-KYTQ2TWIZH` |  |
| 1676 | eutectic: liq -> μ + Co16Nb9 | L: Nb 0.451; μ: Nb 0.503; Co16Nb9: Nb 0.36 | model | [3] Kumar 1998 | Table 4, p. 7, row 22; `ORC-YMPIBEEM7A` |  |
| 1675.15 | congruent melting: Liq. -> CoNb | Liq.: Nb 0.515; CoNb: Nb 0.515 | experimental | [2] Zhou 2020; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table VI, p. 13, row 21; `ORC-CY5BQ523TB` |  |
| 1675.15 | congruent melting: L = Co7Nb6(μ) | L: Nb 0.515; Co7Nb6(μ): Nb 0.515 | experimental | [1] He 2015; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 3, p. 6, row 13; `ORC-XDIYOIZCHV` |  |
| 1672.15 | congruent melting: L = Co7Nb6(μ) | L: Nb 0.503; Co7Nb6(μ): Nb 0.503 | model | [1] He 2015 | Table 3, p. 6, row 12; `ORC-7G6P2EQFWP` |  |
| 1656.15 | eutectic: Liq. -> λ1 + CoNb | Liq.: Nb 0.433; λ1: Nb 0.373; CoNb: Nb 0.482 | model | [2] Zhou 2020 | Table VI, p. 13, row 16; `ORC-4GOVJJMQUV` |  |
| 1655.15 | eutectic: L = Co7Nb6(μ) + C14 | L: Nb 0.444; Co7Nb6(μ): Nb 0.478; C14: Nb 0.372 | model | [1] He 2015 | Table 3, p. 6, row 17; `ORC-VJLUYIHXHU` |  |
| 1653.15 | eutectic: L = (Nb) + Co7Nb6(μ) | Co7Nb6(μ): Co 0.538462, Nb 0.461538 | experimental | [1] He 2015; _cites Shurin 1964_ | Table 3, p. 6, row 27; `ORC-WHPZMW2PT6` |  |
| 1653.15 | eutectic: L = Co7Nb6(μ) + C14 | Co7Nb6(μ): Co 0.538462, Nb 0.461538 | experimental | [1] He 2015; _cites Shurin 1964_ | Table 3, p. 6, row 21; `ORC-YHETZDCHUV` |  |
| 1653 | eutectic: liq -> μ + Co16Nb9 | Co16Nb9: Nb 0.36 | experimental | [3] Kumar 1998; _cites Shurin 1964_ | Table 4, p. 7, row 24; `ORC-C43E2WIVTE` |  |
| 1653 | eutectic: liq -> μ + bcc | bcc: Nb 0.984 | experimental | [3] Kumar 1998; _cites Shurin 1964_ | Table 4, p. 7, row 28; `ORC-P7AAZ2JBDG` |  |
| 1652.15 | eutectic: Liq. -> λ1 + CoNb | λ1: Nb 0.37; CoNb: Nb 0.47 | experimental | [2] Zhou 2020; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table VI, p. 13, row 19; `ORC-J333YEAMHJ` |  |
| 1652.15 | eutectic: L = Co7Nb6(μ) + C14 | L: Nb 0.45; Co7Nb6(μ): Nb 0.47; C14: Nb 0.37 | experimental | [1] He 2015; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table 3, p. 6, row 18; `ORC-N6JOM3XD7L` |  |
| 1651.15 | eutectic: L = Co7Nb6(μ) + C14 | Co7Nb6(μ): Co 0.538462, Nb 0.461538 | experimental | [1] He 2015; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 3, p. 6, row 19; `ORC-EAZLKMILGZ` |  |
| 1651.15 | eutectic: Liq. -> λ1 + CoNb | Liq.: Nb 0.43; CoNb: Nb 0.505 | experimental | [2] Zhou 2020; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table VI, p. 13, row 17; `ORC-SRMFH3U7IP` |  |
| 1647.15 | eutectic: Liq. -> CoNb + bcc(Nb) | Liq.: Nb 0.61; CoNb: Nb 0.527; bcc(Nb): Nb 0.969 | experimental | [2] Zhou 2020; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table VI, p. 13, row 24; `ORC-KXVQSUNO6C` |  |
| 1647.15 | eutectic: L = (Nb) + Co7Nb6(μ) | L: Nb 0.61; (Nb): Nb 0.969; Co7Nb6(μ): Nb 0.527 | experimental | [1] He 2015; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 3, p. 6, row 25; `ORC-YQRMHG4FD6` |  |
| 1647 | eutectic: liq -> μ + bcc | L: Nb 0.61; μ: Nb 0.527; bcc: Nb 0.969 | experimental | [3] Kumar 1998; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 4, p. 7, row 26; `ORC-C33Z6FB4VH` |  |
| 1644.15 | eutectic: L = (Nb) + Co7Nb6(μ) | L: Nb 0.595; (Nb): Nb 0.943; Co7Nb6(μ): Nb 0.564 | model | [1] He 2015 | Table 3, p. 6, row 23; `ORC-EC6E4KDSRI` |  |
| 1643.15 | eutectic: L = (Nb) + Co7Nb6(μ) | L: Nb 0.65; Co7Nb6(μ): Co 0.538462, Nb 0.461538 | experimental | [1] He 2015; _cites Bataleva 1970_ | Table 3, p. 6, row 26; `ORC-DG2JHQELKG` |  |
| 1643.15 | eutectic: Liq. -> λ1 + CoNb | Liq.: Nb 0.47; CoNb: Co 0.5, Nb 0.5 | experimental | [2] Zhou 2020; _cites SK 1970_ | Table VI, p. 13, row 18; `ORC-GC2POAIX3D` |  |
| 1643.15 | eutectic: Liq. -> CoNb + bcc(Nb) | Liq.: Nb 0.65; CoNb: Co 0.5, Nb 0.5 | experimental | [2] Zhou 2020; _cites SK 1970_ | Table VI, p. 13, row 25; `ORC-JQFCKDQNYR` |  |
| 1643.15 | eutectic: L = Co7Nb6(μ) + C14 | L: Nb 0.47; Co7Nb6(μ): Co 0.538462, Nb 0.461538 | experimental | [1] He 2015; _cites Bataleva 1970_ | Table 3, p. 6, row 20; `ORC-OAMAEMMWJ4` |  |
| 1643 | eutectic: liq -> μ + bcc | L: Nb 0.65 | experimental | [3] Kumar 1998; _cites Bataleva 1970_ | Table 4, p. 7, row 27; `ORC-3BRLQZN5WM` |  |
| 1643 | eutectic: liq -> μ + Co16Nb9 | L: Nb 0.47; Co16Nb9: Nb 0.36 | experimental | [3] Kumar 1998; _cites Bataleva 1970_ | Table 4, p. 7, row 23; `ORC-Q57EBU5U72` |  |
| 1638.15 | eutectic: Liq. -> CoNb + bcc(Nb) | Liq.: Nb 0.626; CoNb: Nb 0.559; bcc(Nb): Nb 0.942 | model | [2] Zhou 2020 | Table VI, p. 13, row 23; `ORC-OWXMXFV4ET` |  |
| 1637.15 | eutectic: L = (Nb) + Co7Nb6(μ) | L: Nb 0.633; (Nb): Nb 0.97; Co7Nb6(μ): Nb 0.533 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 28; `ORC-J7PRSMCVVQ` |  |
| 1637 | eutectic: liq -> μ + bcc | L: Nb 0.633; μ: Nb 0.533; bcc: Nb 0.97 | model | [3] Kumar 1998 | Table 4, p. 7, row 25; `ORC-DFATCXUJLP` |  |
| 1596.15 | peritectic: (αCo)+C36 = Co7Nb2 | Co7Nb2: Co 0.777778, Nb 0.222222 | experimental | [1] He 2015; _cites Bataleva 1970_ | Table 3, p. 6, row 46; `ORC-PABTLFMAKH` |  |
| 1537.15 | peritectic: L + C15 = C36 | L: Nb 0.145; C15: Nb 0.26; C36: Nb 0.25 | experimental | [1] He 2015; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table 3, p. 6, row 30; `ORC-DGX2GZSGK3` |  |
| 1537.15 | peritectic: L + C15 = C36 | L: Nb 0.154; C15: Nb 0.251; C36: Nb 0.243 | model | [1] He 2015 | Table 3, p. 6, row 29; `ORC-EYAKI442EX` |  |
| 1537.15 | Liq. + λ2 -> λ3 | Liq.: Nb 0.164; λ2: Nb 0.251; λ3: Nb 0.246 | model | [2] Zhou 2020 | Table VI, p. 13, row 5; `ORC-TZWMZ3XTD4` |  |
| 1537.15 | Liq. + λ2 -> λ3 | Liq.: Nb 0.145; λ2: Nb 0.26; λ3: Nb 0.25 | experimental | [2] Zhou 2020; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table VI, p. 13, row 8; `ORC-ZNI5M6W7VY` |  |
| 1523.15 | λ1 -> λ2 + CoNb | λ1: Nb 0.355; λ2: Nb 0.365; CoNb: Nb 0.465 | experimental | [2] Zhou 2020; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table VI, p. 13, row 35; `ORC-G45UDBHRI5` |  |
| 1523.15 | eutectoid: C14 = C15 + Co7Nb6(μ) | C14: Nb 0.365; C15: Nb 0.355; Co7Nb6(μ): Nb 0.465 | experimental | [1] He 2015; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table 3, p. 6, row 35; `ORC-QQN3E4FJU7` |  |
| 1523.15 | λ1 -> λ2 + CoNb | λ1: Nb 0.354; λ2: Nb 0.364; CoNb: Nb 0.482 | model | [2] Zhou 2020 | Table VI, p. 13, row 33; `ORC-S5UTANQBOB` |  |
| 1522.15 | peritectic: L + C15 = C36 | L: Nb 0.138; C15: Nb 0.271; C36: Nb 0.25 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 33; `ORC-CD22B6F3WC` |  |
| 1522 | peritectic: liq + λ -> Co3Nb | L: Nb 0.138; λ: Nb 0.271; Co3Nb: Nb 0.25 | model | [3] Kumar 1998 | Table 4, p. 7, row 16; `ORC-GVP7PXCVH7` |  |
| 1520.15 | peritectic: L + C15 = C36 | L: Nb 0.145; C15: Nb 0.273 | experimental | [1] He 2015; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 3, p. 6, row 31; `ORC-3T3CRZ57YC` |  |
| 1520.15 | Liq. + λ2 -> λ3 | Liq.: Nb 0.145; λ2: Nb 0.273 | experimental | [2] Zhou 2020; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table VI, p. 13, row 6; `ORC-5BNDBHUH3L` |  |
| 1520 | peritectic: liq + λ -> Co3Nb | L: Nb 0.145; λ: Nb 0.273; Co3Nb: Nb 0.25 | experimental | [3] Kumar 1998; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 4, p. 7, row 18; `ORC-4NEI2S4GMG` |  |
| 1513.15 | peritectic: L + C15 = C36 | L: Nb 0.165 | experimental | [1] He 2015; _cites Bataleva 1970_ | Table 3, p. 6, row 32; `ORC-LG4BHIEYQI` |  |
| 1513.15 | Liq. + λ2 -> λ3 | Liq.: Nb 0.165 | experimental | [2] Zhou 2020; _cites SK 1970_ | Table VI, p. 13, row 7; `ORC-RZV7BMIXHL` |  |
| 1513 | peritectic: liq + λ -> Co3Nb | L: Nb 0.165; Co3Nb: Nb 0.25 | experimental | [3] Kumar 1998; _cites Bataleva 1970_ | Table 4, p. 7, row 17; `ORC-DYEKMJHZ32` |  |
| 1512.15 | eutectic: liq. -> fcc(Co) + λ3 | liq.: Nb 0.153; fcc(Co): Nb 0.049; λ3: Nb 0.241 | model | [2] Zhou 2020 | Table VI, p. 13, row 1; `ORC-MNCGLMPU33` |  |
| 1512.15 | eutectic: liq. -> fcc(Co) + λ3 | liq.: Nb 0.139; fcc(Co): Nb 0.055; λ3: Nb 0.245 | experimental | [2] Zhou 2020; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table VI, p. 13, row 4; `ORC-NA5VR7UPFM` |  |
| 1512.15 | eutectic: L = (αCo) + C36 | L: Nb 0.14; (αCo): Nb 0.055; C36: Nb 0.245 | experimental | [1] He 2015; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table 3, p. 6, row 40; `ORC-XS4FWTV2ZB` |  |
| 1511.15 | eutectoid: C14 = C15 + Co7Nb6(μ) | C14: Nb 0.366; C15: Nb 0.354; Co7Nb6(μ): Nb 0.474 | model | [1] He 2015 | Table 3, p. 6, row 34; `ORC-4AWWCN5M3V` |  |
| 1510.15 | eutectic: liq. -> fcc(Co) + λ3 | liq.: Nb 0.139; fcc(Co): Nb 0.055 | experimental | [2] Zhou 2020; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table VI, p. 13, row 2; `ORC-3WHA6RLILG` |  |
| 1510.15 | eutectic: L = (αCo) + C36 | L: Nb 0.143; (αCo): Nb 0.054; C36: Nb 0.237 | model | [1] He 2015 | Table 3, p. 6, row 39; `ORC-LPD756XL4X` |  |
| 1510.15 | eutectic: L = (αCo) + C36 | L: Nb 0.139; (αCo): Nb 0.055 | experimental | [1] He 2015; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 3, p. 6, row 41; `ORC-WJ6XPJBVBV` |  |
| 1510 | eutectic: liq -> fcc + Co3Nb | L: Nb 0.139; fcc: Nb 0.055; Co3Nb: Nb 0.25 | experimental | [3] Kumar 1998; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 4, p. 7, row 13; `ORC-J6ZSDJBJAX` |  |
| 1508 | eutectic: liq -> fcc + Co3Nb | L: Nb 0.145; Co3Nb: Nb 0.25 | experimental | [3] Kumar 1998; _cites Hansen 1958_ [doi](https://doi.org/10.1149/1.2428700) | Table 4, p. 7, row 15; `ORC-2USOTU6VKA` |  |
| 1504.15 | eutectic: L = (αCo) + C36 | L: Nb 0.13; (αCo): Nb 0.051; C36: Nb 0.25 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 43; `ORC-NYWNLHS3UJ` |  |
| 1504 | eutectic: liq -> fcc + Co3Nb | L: Nb 0.13; fcc: Nb 0.051; Co3Nb: Nb 0.25 | model | [3] Kumar 1998 | Table 4, p. 7, row 11; `ORC-4OZZLY7OH6` |  |
| 1498.15 | eutectoid: C14 = C15 + Co7Nb6(μ) | Co7Nb6(μ): Co 0.538462, Nb 0.461538 | experimental | [1] He 2015; _cites Shurin 1964_ | Table 3, p. 6, row 37; `ORC-LLWGXTCQGD` |  |
| 1498 | eutectoid: Co16Nb9 -> λ + μ | Co16Nb9: Nb 0.36 | experimental | [3] Kumar 1998; _cites Shurin 1964_ | Table 4, p. 7, row 35; `ORC-BWZIKKIA3X` |  |
| 1485.15 | eutectoid: C14 = C15 + Co7Nb6(μ) | Co7Nb6(μ): Co 0.538462, Nb 0.461538 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 38; `ORC-SAGNQLFOLL` |  |
| 1485 | eutectoid: Co16Nb9 -> λ + μ | Co16Nb9: Nb 0.36; λ: Nb 0.334; μ: Nb 0.504 | model | [3] Kumar 1998 | Table 4, p. 7, row 33; `ORC-TJSEAFJLFI` |  |
| 1483.15 | eutectic: liq. -> fcc(Co) + λ3 | liq.: Nb 0.15 | experimental | [2] Zhou 2020; _cites SK 1970_ | Table VI, p. 13, row 3; `ORC-EKU6ZVNSFZ` |  |
| 1483.15 | eutectic: L = (αCo) + C36 | L: Nb 0.15 | experimental | [1] He 2015; _cites Bataleva 1970_ | Table 3, p. 6, row 42; `ORC-P2Y3BCE2EQ` |  |
| 1483 | eutectic: liq -> fcc + Co3Nb | L: Nb 0.15; Co3Nb: Nb 0.25 | experimental | [3] Kumar 1998; _cites Bataleva 1970_ | Table 4, p. 7, row 12; `ORC-AQV7YJZGXW` |  |
| 1483 | eutectic: liq -> fcc + Co3Nb | Co3Nb: Nb 0.25 | experimental | [3] Kumar 1998; _cites Shurin 1964_ | Table 4, p. 7, row 14; `ORC-IL63YR6FMY` |  |
| 1473.15 | λ1 -> λ2 + CoNb | CoNb: Co 0.5, Nb 0.5 | experimental | [2] Zhou 2020; _cites SK 1970_ | Table VI, p. 13, row 34; `ORC-QQG6RCC7JO` |  |
| 1473.15 | eutectoid: C14 = C15 + Co7Nb6(μ) | Co7Nb6(μ): Co 0.538462, Nb 0.461538 | experimental | [1] He 2015; _cites Bataleva 1970_ | Table 3, p. 6, row 36; `ORC-QRF3LW3UZ3` |  |
| 1473 | eutectoid: Co16Nb9 -> λ + μ | Co16Nb9: Nb 0.36 | experimental | [3] Kumar 1998; _cites Bataleva 1970_ | Table 4, p. 7, row 34; `ORC-4QOCK7FZD2` |  |
| 1359.15 | peritectic: (αCo)+C36 = Co7Nb2 | (αCo): Nb 0.037; C36: Nb 0.245; Co7Nb2: Nb 0.222 | experimental | [1] He 2015; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table 3, p. 6, row 45; `ORC-CPQLWTKPKL` |  |
| 1359.15 | fcc(Co) + λ3 -> Co7Nb2 | fcc(Co): Nb 0.037; λ3: Nb 0.245; Co7Nb2: Nb 0.222 | experimental | [2] Zhou 2020; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table VI, p. 13, row 29; `ORC-HQL6RMAGIJ` |  |
| 1359.15 | fcc(Co) + λ3 -> Co7Nb2 | fcc(Co): Nb 0.035; λ3: Nb 0.244; Co7Nb2: Nb 0.222 | model | [2] Zhou 2020 | Table VI, p. 13, row 27; `ORC-QAHVKYNB5J` |  |
| 1358.15 | peritectic: (αCo)+C36 = Co7Nb2 | (αCo): Nb 0.036; C36: Nb 0.24; Co7Nb2: Nb 0.222 | model | [1] He 2015 | Table 3, p. 6, row 44; `ORC-M6NJ3KFPGH` |  |
| 1323.15 | fcc(Co) + λ3 -> Co7Nb2 | Co7Nb2: Co 0.777778, Nb 0.222222 | experimental | [2] Zhou 2020; _cites SK 1970_ | Table VI, p. 13, row 28; `ORC-3ZYBZM6KQZ` |  |
| 1323 | peritectoid: fcc + Co3Nb -> Co7Nb2 | Co3Nb: Nb 0.25; Co7Nb2: Nb 0.222222 | experimental | [3] Kumar 1998; _cites Bataleva 1970_ | Table 4, p. 7, row 30; `ORC-3BAJL6RSBZ` |  |
| 1318.15 | λ3 -> Co7Nb2 + λ2 | λ3: Nb 0.257; Co7Nb2: Nb 0.222; λ2: Nb 0.265 | model | [2] Zhou 2020 | Table VI, p. 13, row 30; `ORC-V42VWSGYUC` |  |
| 1313.15 | λ3 -> Co7Nb2 + λ2 | λ3: Nb 0.25; Co7Nb2: Nb 0.222; λ2: Nb 0.26 | experimental | [2] Zhou 2020; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table VI, p. 13, row 32; `ORC-FC7UJ3WUC3` |  |
| 1313.15 | eutectoid: C36 = Co7Nb2 + C15 | C36: Nb 0.25; Co7Nb2: Nb 0.222; C15: Nb 0.26 | experimental | [1] He 2015; _cites Stein 2008_ [doi](https://doi.org/10.1016/j.intermet.2008.02.017) | Table 3, p. 6, row 49; `ORC-UTP4K67BQP` |  |
| 1313.15 | peritectic: (αCo)+C36 = Co7Nb2 | (αCo): Nb 0.026; C36: Nb 0.25; Co7Nb2: Nb 0.22 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 47; `ORC-XCA3Y7ADOS` |  |
| 1313 | peritectoid: fcc + Co3Nb -> Co7Nb2 | fcc: Nb 0.026; Co3Nb: Nb 0.25; Co7Nb2: Nb 0.222 | model | [3] Kumar 1998 | Table 4, p. 7, row 29; `ORC-BJTKMZUSRD` |  |
| 1302.15 | eutectoid: C36 = Co7Nb2 + C15 | C36: Nb 0.256; Co7Nb2: Nb 0.222; C15: Nb 0.268 | model | [1] He 2015 | Table 3, p. 6, row 48; `ORC-35QALQSMO4` |  |
| 1278.15 | eutectoid: C36 = Co7Nb2 + C15 | C36: Nb 0.25; Co7Nb2: Nb 0.222; C15: Nb 0.287 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 51; `ORC-BCYRZBWHQX` |  |
| 1278 | eutectoid: Co3Nb -> Co7Nb2 + λ | Co3Nb: Nb 0.25; Co7Nb2: Nb 0.222; λ: Nb 0.287 | model | [3] Kumar 1998 | Table 4, p. 7, row 31; `ORC-7OJFCPVGP7` |  |
| 1273.15 | eutectoid: C36 = Co7Nb2 + C15 | Co7Nb2: Co 0.777778, Nb 0.222222 | experimental | [1] He 2015; _cites Bataleva 1970_ | Table 3, p. 6, row 50; `ORC-6UUXQKJGXQ` |  |
| 1273.15 | λ3 -> Co7Nb2 + λ2 | Co7Nb2: Co 0.777778, Nb 0.222222 | experimental | [2] Zhou 2020; _cites SK 1970_ | Table VI, p. 13, row 31; `ORC-S3JLVMTI3N` |  |
| 1273 | eutectoid: Co3Nb -> Co7Nb2 + λ | Co3Nb: Nb 0.25; Co7Nb2: Nb 0.222222 | experimental | [3] Kumar 1998; _cites Bataleva 1970_ | Table 4, p. 7, row 32; `ORC-3FKSQIX7HZ` |  |
| 694.18 | eutectoid: fcc -> hcp + Co7Nb2 | fcc: Nb 8.580e-5; hcp: Nb 6.080e-7; Co7Nb2: Nb 0.222 | model | [3] Kumar 1998 | Table 4, p. 7, row 36; `ORC-WRQEDBQR5I` |  |
| 694.15 | eutectoid: (αCo) = (εCo) + Co7Nb2 | (αCo): Nb 8.600e-5; (εCo): Nb 1.000e-6; Co7Nb2: Nb 0.222 | model | [1] He 2015; _cites Kumar 1998_ [doi](https://doi.org/10.1016/s0925-8388%2897%2900465-9) | Table 3, p. 6, row 53; `ORC-75ALKV6UGZ` |  |
| 691.15 | eutectoid: (αCo) = (εCo) + Co7Nb2 | (αCo): Nb 5.000e-4; (εCo): Nb 7.000e-5; Co7Nb2: Nb 0.222 | model | [1] He 2015 | Table 3, p. 6, row 52; `ORC-2GKRLKLLEC` |  |
| 688.15 | fcc(Co) -> hcp(Co) + Co7Nb2 | fcc(Co): Nb 0.001; Co7Nb2: Nb 0.222 | model | [2] Zhou 2020 | Table VI, p. 13, row 36; `ORC-XKR3K3QC6D` |  |

## Other properties

### Phase transition (10)

Table: Phase transition, Co–Nb system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1675 K | 1675 | congruent melting: liq -> μ; _L: Nb 0.515; μ: Nb 0.515_ | experimental | [3] Kumar 1998; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 4, p. 7, row 3; `ORC-PRBVI346FZ` |  |
| Phase transition | 1697 K | 1697 | congruent melting: liq -> μ; _L: Nb 0.518; μ: Nb 0.518_ | model | [3] Kumar 1998 | Table 4, p. 7, row 1; `ORC-OXU5XAORUF` |  |
| Phase transition | 1703 K | 1703 | congruent melting: liq -> μ; _L: Nb 0.51; μ: Nb 0.51_ | experimental | [3] Kumar 1998; _cites Bataleva 1970_ | Table 4, p. 7, row 2; `ORC-ZPSMOXFPYL` |  |
| Phase transition | 1748 K | 1748 | congruent melting: liq -> λ; _L: Nb 0.328; λ: Nb 0.328_ | model | [3] Kumar 1998 | Table 4, p. 7, row 5; `ORC-24ZLS36WCL` |  |
| Phase transition | 1748 K | 1748 | congruent melting: liq -> μ; _L: Nb 0.52; μ: Nb 0.52_ | experimental | [3] Kumar 1998; _cites Shurin 1964_ | Table 4, p. 7, row 4; `ORC-O7FMTNJP4M` |  |
| Phase transition | 1753 K | 1753 | congruent melting: liq -> λ; _L: Nb 0.32; λ: Nb 0.32_ | experimental | [3] Kumar 1998; _cites Pargeter 1967_ [doi](https://doi.org/10.1016/0022-5088%2867%2990004-5) | Table 4, p. 7, row 7; `ORC-5LSMOWIXDO` |  |
| Phase transition | 1793 K | 1793 | congruent melting: liq -> λ; _L: Nb 0.34; λ: Nb 0.34_ | experimental | [3] Kumar 1998; _cites Bataleva 1970_ | Table 4, p. 7, row 6; `ORC-JCBPN2HCIQ` |  |
| Phase transition | 1813 K | 1813 | congruent melting: liq -> λ | experimental | [3] Kumar 1998; _cites Shurin 1964_ | Table 4, p. 7, row 8; `ORC-SQN5FIZYZE` |  |
| Phase transition | 1823 K | 1823 | congruent melting: liq -> λ; _L: Nb 0.286; λ: Nb 0.286_ | experimental | [3] Kumar 1998; _cites Koster 1938_ [doi](https://doi.org/10.1515/ijmr-1938-300917) | Table 4, p. 7, row 10; `ORC-PWCO64D6IA` |  |
| Phase transition | 1843 K | 1843 | congruent melting: liq -> λ; _L: Nb 0.333; λ: Nb 0.333_ | experimental | [3] Kumar 1998; _cites Elliot 1954_ | Table 4, p. 7, row 9; `ORC-I3TJEDENVR` |  |

### Crystal structure (1)

Table: Crystal structure, Co–Nb system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Molar volume; _printed: V0_ | 12.13 Å3/atom | 0 | Co7Nb2; _alloy: Nb 0.222222_ | DFT | [2] Zhou 2020 | Table V, p. 12, row 4; `ORC-SG3WXTIXKC` |  |

## Sources

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

1. Cuiyun He, Frank Stein, Martin Palm, Thermodynamic description of the systems Co–Nb, Al–Nb and Co–Al–Nb, Journal of Alloys and Compounds 637, 361-375 (2015). [doi:10.1016/j.jallcom.2015.02.182](https://doi.org/10.1016/j.jallcom.2015.02.182)
2. 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)
3. K.C.Hari Kumar, I. Ansara, P. Wollants, L. Delaey, Thermodynamic optimisation of the Co–Nb system, Journal of Alloys and Compounds 267, 105-112 (1998). [doi:10.1016/s0925-8388(97)00465-9](https://doi.org/10.1016/s0925-8388%2897%2900465-9)

## 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/).