# Co–V system

> Co–V system: 113 accepted literature values (formation 75, invariant reaction 30, phase equilibrium 6, mixing / partial 2) and 6 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

113 accepted literature values from 4 paper(s) (experimental 61, model 21, DFT 25, unspecified 6); 6 calculated phase diagram(s). 16 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-V.json) · [CSV](https://data.orchid-project.org/systems/CO-V.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CO-V) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CO-V/CoV-03Bra-LB.json) · [phases (11)](https://data.orchid-project.org/phases/pages/CO-V.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CO-V.html) · [Markdown](https://data.orchid-project.org/systems/CO-V.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 61 |
| model | 21 |
| DFT | 25 |
| unspecified | 6 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 30 |
| phase equilibrium | 6 |
| formation | 75 |
| mixing / partial | 2 |

## 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 |
|---|---|---|---|
| CoV-03Bra-LB.tdb | J. Bratberg, B. Sundman, J. Phase Equilib., 24, 495-503(2003). [doi:10.1361/105497103772084534](https://doi.org/10.1361/105497103772084534) | `9989e5b98aef44c67ea22b635cd1c710a06d815cb89127f570e3f6154dac5eb7` | [viewer](https://orchid-project.org/phase-diagrams/#CO-V/CoV-03Bra-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoV-03Bra-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoV-03Bra-LB.json) |
| CoV-04Hua.tdb | S. Huang, L. Li, O. Van der Biest, J. Vleugels, J. Alloys Compd., 385, 114-18(2004). [doi:10.1016/j.jallcom.2004.04.131](https://doi.org/10.1016/j.jallcom.2004.04.131) | `dd5238a73f44104a905cad4b8cfcd80f3bc7c6c4425c88218d6ee0d57f5076a2` | [viewer](https://orchid-project.org/phase-diagrams/#CO-V/CoV-04Hua.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoV-04Hua.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoV-04Hua.json) |
| CoV-15Wan.tdb | C. Wang, C. Zhao, Y. Lu, T. Li, D. Peng, J. Shi, X. Liu, Mater. Chem. Phys., 162, 555-60(2015). [doi:10.1016/j.matchemphys.2015.06.028](https://doi.org/10.1016/j.matchemphys.2015.06.028) | `806d7a1de1b823d0674861c13ba0934f60c89b00e1bc7703800d0e90fbd696ee` | [viewer](https://orchid-project.org/phase-diagrams/#CO-V/CoV-15Wan.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoV-15Wan.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoV-15Wan.json) |
| CoV-20Wan-mod.tdb | P. Wang, T. Hammerschmidt, U.R. Kattner, G.B. Olson, Calphad, 68, 101729(2020). [doi:10.1016/j.calphad.2019.101729](https://doi.org/10.1016/j.calphad.2019.101729) | `80e65f032fcdd04ed7434bcfcfc3484a72315feb640322dca3f7750febbb8618` | [viewer](https://orchid-project.org/phase-diagrams/#CO-V/CoV-20Wan-mod.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoV-20Wan-mod.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoV-20Wan-mod.json) |
| CoV-20Wan.tdb | P. Wang, T. Hammerschmidt, U.R. Kattner, G.B. Olson, Calphad, 68, 101729(2020). [doi:10.1016/j.calphad.2019.101729](https://doi.org/10.1016/j.calphad.2019.101729) | `37a72b9c68686fd928fae8526afec3c7ad341e36a208ffa0e06e483dc7f79b9b` | [viewer](https://orchid-project.org/phase-diagrams/#CO-V/CoV-20Wan.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoV-20Wan.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoV-20Wan.json) |
| CoV-24Sun.tdb | J. Sun, C. Guo, C. Li, Z. Du, Calphad, 87, 102762(2024). [doi:10.1016/j.calphad.2024.102762](https://doi.org/10.1016/j.calphad.2024.102762) | `df9c23b303bbb880966762040efe0a7c05a448dcaab801df747a2da5fa13dbea` | [viewer](https://orchid-project.org/phase-diagrams/#CO-V/CoV-24Sun.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoV-24Sun.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoV-24Sun.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CoV-03Bra-LB.tdb | 1688.62 | LIQUID (x(V) 0.66584) + SIGMA_D8B (x(V) 0.68086) + BCC_A2 (x(V) 0.80958) |
| CoV-03Bra-LB.tdb | 1532.67 | FCC_4SL (x(V) 0.32891) + LIQUID (x(V) 0.40972) + SIGMA_D8B (x(V) 0.48343) |
| CoV-03Bra-LB.tdb | 1532.67 | FCC_A1 (x(V) 0.32891) + LIQUID (x(V) 0.40972) + SIGMA_D8B (x(V) 0.48343) |
| CoV-03Bra-LB.tdb | 1299.94 | HCP_4SL (x(V) 0.26268) + FCC_4SL (x(V) 0.31939) + SIGMA_D8B (x(V) 0.46128) |
| CoV-03Bra-LB.tdb | 1299.94 | HCP_4SL (x(V) 0.26268) + FCC_A1 (x(V) 0.31939) + SIGMA_D8B (x(V) 0.46128) |
| CoV-03Bra-LB.tdb | 1299.94 | HCP_4SL (x(V) 0.26268) + FCC_4SL (x(V) 0.31939) + SIGMA_D8B (x(V) 0.46128) |
| CoV-03Bra-LB.tdb | 1299.94 | HCP_4SL (x(V) 0.26268) + FCC_4SL (x(V) 0.31939) + SIGMA_D8B (x(V) 0.46128) |
| CoV-03Bra-LB.tdb | 1299.94 | HCP_4SL (x(V) 0.26268) + FCC_A1 (x(V) 0.31939) + SIGMA_D8B (x(V) 0.46128) |
| CoV-03Bra-LB.tdb | 1297.17 | SIGMA_D8B (x(V) 0.69016) + COV3_A15 (x(V) 0.75) + BCC_A2 (x(V) 0.87593) |
| CoV-03Bra-LB.tdb | 1297.17 | SIGMA_D8B (x(V) 0.69016) + COV3_A15 (x(V) 0.75) + BCC_A2 (x(V) 0.87595) |
| CoV-03Bra-LB.tdb | 988.78 | FCC_4SL (x(V) 0.04657) + FCC_4SL#2 (x(V) 0.08977) + HCP_4SL (x(V) 0.18227) |
| CoV-03Bra-LB.tdb | 988.78 | FCC_A1 (x(V) 0.04657) + FCC_4SL (x(V) 0.08977) + HCP_4SL (x(V) 0.18227) |
| CoV-03Bra-LB.tdb | 704.6 | FCC_4SL (x(V) 0.01611) + HCP_A3 (x(V) 0.01701) + HCP_4SL (x(V) 0.2343) |
| CoV-03Bra-LB.tdb | 704.6 | FCC_A1 (x(V) 0.01611) + HCP_A3 (x(V) 0.01701) + HCP_4SL (x(V) 0.2343) |
| CoV-03Bra-LB.tdb | 704.6 | FCC_A1 (x(V) 0.01611) + HCP_4SL (x(V) 0.01701) + HCP_4SL#2 (x(V) 0.2343) |
| CoV-03Bra-LB.tdb | 694.99 | FCC_A1 (x(V) 0) + HCP_4SL (x(V) 0) + HCP_A3 (x(V) 0) |
| CoV-03Bra-LB.tdb | 516.52 | HCP_4SL (x(V) 0.2511) + SIGMA_D8B (x(V) 0.62668) + COV3_A15 (x(V) 0.75) |
| CoV-03Bra-LB.tdb | 516.52 | HCP_4SL (x(V) 0.2511) + SIGMA_D8B (x(V) 0.6267) + COV3_A15 (x(V) 0.75) |
| CoV-03Bra-LB.tdb | 516.52 | HCP_4SL (x(V) 0.2511) + SIGMA_D8B (x(V) 0.62668) + COV3_A15 (x(V) 0.75) |
| CoV-03Bra-LB.tdb | 516.52 | HCP_4SL (x(V) 0.2511) + SIGMA_D8B (x(V) 0.6267) + COV3_A15 (x(V) 0.75) |
| CoV-03Bra-LB.tdb | 516.52 | HCP_4SL (x(V) 0.2511) + SIGMA_D8B (x(V) 0.6267) + COV3_A15 (x(V) 0.75) |
| CoV-04Hua.tdb | 1691.05 | LIQUID (x(V) 0.64787) + SIGMA_OLD (x(V) 0.66981) + BCC_A2 (x(V) 0.77905) |
| CoV-04Hua.tdb | 1519.08 | FCC_A1 (x(V) 0.33772) + LIQUID (x(V) 0.41197) + SIGMA_OLD (x(V) 0.47303) |
| CoV-04Hua.tdb | 1299.01 | SIGMA_OLD (x(V) 0.68738) + COV3_A15 (x(V) 0.75) + BCC_A2 (x(V) 0.83136) |
| CoV-04Hua.tdb | 1299.01 | SIGMA_OLD (x(V) 0.68738) + COV3_A15 (x(V) 0.75) + BCC_A2 (x(V) 0.83138) |
| CoV-04Hua.tdb | 1276.35 | CO3V (x(V) 0.25) + FCC_A1 (x(V) 0.31745) + SIGMA_OLD (x(V) 0.41425) |
| CoV-04Hua.tdb | 1276.35 | CO3V (x(V) 0.25) + FCC_A1 (x(V) 0.31744) + SIGMA_OLD (x(V) 0.41422) |
| CoV-15Wan.tdb | 1694.72 | LIQUID (x(V) 0.65323) + SIGMA_OLD (x(V) 0.66446) + BCC_A2 (x(V) 0.77991) |
| CoV-15Wan.tdb | 1520.99 | FCC_A1 (x(V) 0.33201) + LIQUID (x(V) 0.41648) + SIGMA_OLD (x(V) 0.47857) |
| CoV-15Wan.tdb | 1299.33 | CO3V (x(V) 0.30516) + FCC_A1 (x(V) 0.33325) + SIGMA_OLD (x(V) 0.45544) |
| CoV-15Wan.tdb | 1298.01 | SIGMA_OLD (x(V) 0.68899) + COV3_A15 (x(V) 0.75) + BCC_A2 (x(V) 0.90405) |
| CoV-15Wan.tdb | 1298.01 | SIGMA_OLD (x(V) 0.689) + COV3_A15 (x(V) 0.75) + BCC_A2 (x(V) 0.90411) |
| CoV-15Wan.tdb | 991.55 | FCC_A1#2 (x(V) 0.0534) + FCC_A1 (x(V) 0.11109) + CO3V (x(V) 0.20841) |
| CoV-15Wan.tdb | 684.51 | HCP_A3 (x(V) 0.02246) + FCC_A1 (x(V) 0.02686) + CO3V (x(V) 0.20409) |
| CoV-20Wan-mod.tdb | 1696.17 | LIQUID (x(V) 0.6599) + SIGMA_D8B (x(V) 0.6685) + BCC_A2 (x(V) 0.78211) |
| CoV-20Wan-mod.tdb | 1517.88 | FCC_4SL (x(V) 0.36305) + LIQUID (x(V) 0.43092) + SIGMA_D8B (x(V) 0.47359) |
| CoV-20Wan-mod.tdb | 1517.88 | FCC_A1 (x(V) 0.36305) + LIQUID (x(V) 0.43092) + SIGMA_D8B (x(V) 0.47359) |
| CoV-20Wan-mod.tdb | 1307.7 | SIGMA_D8B (x(V) 0.67242) + COV3_A15 (x(V) 0.75454) + BCC_A2 (x(V) 0.89667) |
| CoV-20Wan-mod.tdb | 1282.35 | CO3V (x(V) 0.30968) + FCC_A1 (x(V) 0.33543) + SIGMA_D8B (x(V) 0.41698) |
| CoV-20Wan-mod.tdb | 1282.35 | CO3V (x(V) 0.30968) + FCC_4SL (x(V) 0.33543) + SIGMA_D8B (x(V) 0.41698) |
| CoV-20Wan-mod.tdb | 1004.82 | FCC_4SL (x(V) 0.04786) + FCC_A1 (x(V) 0.09948) + CO3V (x(V) 0.25014) |
| CoV-20Wan-mod.tdb | 1004.82 | FCC_4SL#2 (x(V) 0.04786) + FCC_4SL (x(V) 0.09948) + CO3V (x(V) 0.25014) |
| CoV-20Wan-mod.tdb | 666.36 | HCP_A3 (x(V) 0.00125) + FCC_4SL (x(V) 0.00451) + CO3V (x(V) 0.25) |
| CoV-20Wan-mod.tdb | 666.36 | HCP_A3 (x(V) 0.00125) + FCC_4SL (x(V) 0.00449) + CO3V (x(V) 0.25) |
| CoV-20Wan.tdb | 1695.53 | LIQUID (x(V) 0.65955) + SIGMA_D8B (x(V) 0.66896) + BCC_A2 (x(V) 0.78154) |
| CoV-20Wan.tdb | 1517.78 | FCC_4SL (x(V) 0.36312) + LIQUID (x(V) 0.431) + SIGMA_D8B (x(V) 0.46073) |
| CoV-20Wan.tdb | 1296.74 | SIGMA_D8B (x(V) 0.6727) + COV3_A15 (x(V) 0.75) + BCC_A2 (x(V) 0.89925) |
| CoV-20Wan.tdb | 1296.74 | SIGMA_D8B (x(V) 0.6727) + COV3_A15 (x(V) 0.75) + BCC_A2 (x(V) 0.89929) |
| CoV-20Wan.tdb | 1281.56 | CO3V (x(V) 0.31348) + FCC_4SL (x(V) 0.33897) + SIGMA_D8B (x(V) 0.42335) |
| CoV-20Wan.tdb | 1004.83 | FCC_4SL#2 (x(V) 0.04786) + FCC_4SL (x(V) 0.09948) + CO3V (x(V) 0.25014) |
| CoV-20Wan.tdb | 666.36 | HCP_A3 (x(V) 0.00125) + FCC_4SL (x(V) 0.00451) + CO3V (x(V) 0.25) |
| CoV-20Wan.tdb | 666.36 | HCP_A3 (x(V) 0.00125) + FCC_4SL (x(V) 0.00449) + CO3V (x(V) 0.25) |
| CoV-24Sun.tdb | 1687.76 | LIQUID (x(V) 0.63712) + SIGMA_D8B (x(V) 0.66745) + BCC_A2 (x(V) 0.76515) |
| CoV-24Sun.tdb | 1518.97 | FCC_A1 (x(V) 0.32795) + LIQUID (x(V) 0.40677) + SIGMA_D8B (x(V) 0.47035) |
| CoV-24Sun.tdb | 1301.77 | CO3V (x(V) 0.30116) + FCC_A1 (x(V) 0.32455) + SIGMA_D8B (x(V) 0.45404) |
| CoV-24Sun.tdb | 1300.34 | SIGMA_D8B (x(V) 0.71839) + COV3_A15 (x(V) 0.75) + BCC_A2 (x(V) 0.92874) |
| CoV-24Sun.tdb | 1300.34 | SIGMA_D8B (x(V) 0.7184) + COV3_A15 (x(V) 0.75) + BCC_A2 (x(V) 0.92879) |
| CoV-24Sun.tdb | 992.74 | FCC_A1#2 (x(V) 0.05355) + FCC_A1 (x(V) 0.11039) + CO3V (x(V) 0.2099) |
| CoV-24Sun.tdb | 683.42 | HCP_A3 (x(V) 0.02203) + FCC_A1 (x(V) 0.02637) + CO3V (x(V) 0.20788) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CO/CO-V.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CO/CO-V.json) · [CALPHAD hull CoV-03Bra-LB](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-V--CoV-03Bra-LB.json) · [CALPHAD hull CoV-04Hua](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-V--CoV-04Hua.json) · [CALPHAD hull CoV-15Wan](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-V--CoV-15Wan.json) · [CALPHAD hull CoV-20Wan-mod](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-V--CoV-20Wan-mod.json) · [CALPHAD hull CoV-20Wan](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-V--CoV-20Wan.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Co–V system (30)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 2183.15 | congruent melting: L -> (V) | (V): V 1 | experimental | [1] Bratberg 2003; _cites Smith 1993_ | Table 1, p. 4, row 12; `ORC-KEMP2LSGDR` |  |
| 1768.15 | congruent melting: L -> (αpCo) | (αpCo): V 0 | experimental | [1] Bratberg 2003; _cites Hume-Rothery 1961_ | Table 1, p. 4, row 3; `ORC-4ZIH23RC6F` |  |
| 1695.15 | peritectic: L + (V) ↔ σ | L: V 0.653; (V): V 0.78; σ: V 0.664 | model | [2] Wang 2015 | Table 4, p. 4, row 12; `ORC-3NWH6OZITL` |  |
| 1695.15 | Liquid + bcc -> sigma | L: V 0.66; bcc: V 0.78; sigma: V 0.67 | experimental | [3] Huang 2004; _cites Greenfield 1954_ | Table 2, p. 4, row 6; `ORC-5H5HSZJJQP` |  |
| 1695.15 | peritectic: L + (V) -> σ | L: V 0.66; (V): V 0.78; σ: V 0.67 | experimental | [1] Bratberg 2003; _cites Koster 1955_ | Table 1, p. 4, row 10; `ORC-UWKOGK2QCD` |  |
| 1695.15 | peritectic: L + (V) ↔ σ | L: V 0.66; (V): V 0.78; σ: V 0.67 | unspecified | [2] Wang 2015; _cites Ko_ | Table 4, p. 4, row 11; `ORC-VZT73Y63WQ` |  |
| 1691.15 | Liquid + bcc -> sigma | L: V 0.648; bcc: V 0.779; sigma: V 0.6698 | model | [3] Huang 2004 | Table 2, p. 4, row 5; `ORC-5TR6CHWXJG` |  |
| 1521.15 | eutectoid: L -> (αpCo) + σ | L: V 0.415; (αpCo): V 0.35; σ: V 0.45 | experimental | [1] Bratberg 2003; _cites Koster 1955_ | Table 1, p. 4, row 9; `ORC-6QAHNJB56J` |  |
| 1521.15 | eutectic: Liquid -> fcc + sigma | L: V 0.415; fcc: V 0.35; sigma: V 0.45 | experimental | [3] Huang 2004; _cites Koster 1955_ [doi](https://doi.org/10.1515/ijmr-1955-460307) | Table 2, p. 4, row 2; `ORC-G3IQ32MNHB` |  |
| 1521.15 | eutectoid: L ↔ (αpCo) + σ | L: V 0.332; (αpCo): V 0.416; σ: V 0.478 | model | [2] Wang 2015 | Table 4, p. 4, row 10; `ORC-H2HI34M3QI` |  |
| 1521.15 | eutectoid: L ↔ (αpCo) + σ | L: V 0.35; (αpCo): V 0.415; σ: V 0.45 | unspecified | [2] Wang 2015; _cites Ko_ | Table 4, p. 4, row 9; `ORC-ZG7N6VAQPY` |  |
| 1519.15 | eutectic: Liquid -> fcc + sigma | L: V 0.412; fcc: V 0.337; sigma: V 0.473 | model | [3] Huang 2004 | Table 2, p. 4, row 1; `ORC-ZRST2CTMIK` |  |
| 1396.15 | magnetic: (αfCo) -> (αpCo) | (αpCo): V 0 | experimental | [1] Bratberg 2003; _cites Fernandez 2003_ | Table 1, p. 4, row 2; `ORC-LWNJQUK6UF` |  |
| 1343.15 | other: Co3V ↔ (αpCo) | Co3V: V 0.285; (αpCo): V 0.285 | model | [2] Wang 2015 | Table 4, p. 4, row 6; `ORC-UFTAPEGOWJ` |  |
| 1343.15 | other: Co3V ↔ (αpCo) | Co3V: V 0.25; (αpCo): V 0.25 | unspecified | [2] Wang 2015; _cites Ko_ | Table 4, p. 4, row 5; `ORC-UKL3JHGZEF` |  |
| 1343.15 | other: Co3V (fcc) -> (αpCo) | Co3V (fcc): Co 0.75, V 0.25; (αpCo): V 0.25 | experimental | [1] Bratberg 2003; _cites Koster 1955_ | Table 1, p. 4, row 7; `ORC-Z3Y3EAZKYS` |  |
| 1318.15 | polymorphic: Co3V (hex) -> (Co3V(fcc) | Co3V (hex): Co 0.75, V 0.25 | experimental | [1] Bratberg 2003; _cites Smith 1993_ | Table 1, p. 4, row 6; `ORC-NJ5OIBM7EB` |  |
| 1299.15 | eutectoid: (αpCo) ↔ Co3V + σ | (αpCo): V 0.32; Co3V: V 0.34; σ: V 0.45 | unspecified | [2] Wang 2015; _cites Ko_ | Table 4, p. 4, row 7; `ORC-4IBFGCOEYH` |  |
| 1299.15 | eutectoid: (αpCo) -> Co3V + σ | (αpCo): V 0.34; Co3V: V 0.32; σ: V 0.45 | experimental | [1] Bratberg 2003; _cites Koster 1955_ | Table 1, p. 4, row 8; `ORC-7Y3PTN6D6K` |  |
| 1299.15 | Sigma + bcc -> CoM3 | Sigma: V 0.6874; bcc: V 0.8314; CoM3: V 0.75 | model | [3] Huang 2004 | Table 2, p. 4, row 7; `ORC-AEGF5T5POI` |  |
| 1299.15 | eutectoid: (αpCo) ↔ Co3V + σ | (αpCo): V 0.305; Co3V: V 0.333; σ: V 0.455 | model | [2] Wang 2015 | Table 4, p. 4, row 8; `ORC-GKYGXNS6XY` |  |
| 1299.15 | fcc -> Co3M + sigma | fcc: V 0.34; Co3M: V 0.25; sigma: V 0.45 | experimental | [3] Huang 2004; _cites Koster 1955_ [doi](https://doi.org/10.1515/ijmr-1955-460307) | Table 2, p. 4, row 4; `ORC-SGWIIAA6TM` |  |
| 1298.15 | Sigma + bcc -> CoM3 | Sigma: V 0.69; bcc: V 0.8; CoM3: V 0.75 | experimental | [3] Huang 2004; _cites Greenfield 1954_ | Table 2, p. 4, row 8; `ORC-GG6P4AWT2T` |  |
| 1298.15 | peritectoid: σ + (V) ↔ CoV3 | σ: V 0.71; (V): V 0.84; CoV3: V 0.75 | experimental | [2] Wang 2015; _cites Zegler 1963_ | Table 4, p. 4, row 13; `ORC-GH7T53CJCN` |  |
| 1298.15 | peritectoid: σ + (V) -> CoV3 | σ: V 0.71; (V): V 0.84; CoV3: V 0.75 | experimental | [1] Bratberg 2003; _cites Zegler 1963_ | Table 1, p. 4, row 11; `ORC-NEAI6Y4NF5` |  |
| 1298.15 | peritectoid: σ + (V) ↔ CoV3 | σ: V 0.689; (V): V 0.904; CoV3: V 0.75 | model | [2] Wang 2015 | Table 4, p. 4, row 14; `ORC-U6RBHYKI3X` |  |
| 1276.15 | fcc -> Co3M + sigma | fcc: V 0.3174; Co3M: V 0.25; sigma: V 0.4143 | model | [3] Huang 2004 | Table 2, p. 4, row 3; `ORC-UDMHNVQNLY` |  |
| 991.15 | eutectoid: (αpCo) ↔ (αfCo) + Co3V | (αpCo): V 0.053; (αfCo): V 0.111; Co3V: V 0.208 | model | [2] Wang 2015 | Table 4, p. 4, row 4; `ORC-77V6CGUJZN` |  |
| 695.15 | polymorphic: (εCo) -> (αfCo) | (αfCo): V 0 | experimental | [1] Bratberg 2003; _cites Nishizawa 1983_ | Table 1, p. 4, row 1; `ORC-7WJR2L4JOG` |  |
| 671.15 | eutectoid: (αfCo) ↔ (εCo) + Co3V | (αfCo): V 0.022; (εCo): V 0.027; Co3V: V 0.204 | model | [2] Wang 2015 | Table 4, p. 4, row 2; `ORC-4S7FQSPGYN` |  |

## 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, Co–V system (55)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Co3V |  | -16.3103 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 8; `ORC-DD374OL74D` |  |
| Co3V |  | -7.2976 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 11; `ORC-QAIII4KUMU` |  |
| Co3V |  | -7.1374 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 7; `ORC-PHRU4NQ5CT` |  |
| Co3V |  | -7.0055 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 10; `ORC-BO42QNAHFH` |  |
| Co3V |  | -1.3604 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 4; `ORC-BNGDYTKBIZ` |  |
| Co3V |  | -6.000e-4 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 3; `ORC-DDIXQSLYF6` |  |
| Co3V |  | 1.1026 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 1; `ORC-NUGYEFNDZM` |  |
| Co3V |  | 1.7914 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 6; `ORC-YZJXUT3IKL` |  |
| Co3V |  | 4.4217 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 12; `ORC-UL2KXUEW66` |  |
| Co3V |  | 4.5149 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 5; `ORC-7C2YMW7A77` |  |
| Co3V |  | 7.0017 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 9; `ORC-VLFCSVZM2Q` |  |
| Co3V |  | 8.4967 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 16; `ORC-6ZZU27SDIK` |  |
| Co3V |  | 9.8872 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 14; `ORC-JHN7POPRKN` |  |
| Co3V |  | 13.9387 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 13; `ORC-2OVRJO3IAD` |  |
| Co3V |  | 17.3899 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 15; `ORC-SZ65PHMG2Q` |  |
| Co3V |  | 23.2844 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 2; `ORC-6SODOQ4MGY` |  |
| CoV3 |  | -18.9595 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 19; `ORC-4T2NOFYF4Y` |  |
| CoV3 |  | -2.6519 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 18; `ORC-YO25DK7EV4` |  |
| CoV3 |  | 4.642 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 20; `ORC-3SRRMHKM5B` |  |
| CoV3 |  | 9.1849 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 17; `ORC-RACHXT46RW` |  |
| bcc |  | -2.845 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 3, p. 6, row 17; `ORC-FXFJKQHZZV` |  |
| bcc |  | -2.845 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 9; `ORC-XBRUG5EF45.350c25` |  |
| bcc |  | -1.637 kJ/mol-atom | 1473 | model |  |  | [1] Bratberg 2003 | Table 3, p. 6, row 18; `ORC-XG3GNB6RMF` |  |
| bcc |  | -1.445 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 3, p. 6, row 19; `ORC-OGVDEIKLWQ` |  |
| bcc |  | -1.445 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 10; `ORC-WKCNEY3JHT.91fa9d` |  |
| bcc |  | -0.876 kJ/mol-atom | 1473 | model |  |  | [1] Bratberg 2003 | Table 3, p. 6, row 20; `ORC-D6KOZC2MOT` |  |
| fcc |  | -9.75 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 3, p. 6, row 7; `ORC-A6Y367GBWE` |  |
| fcc |  | -9.75 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 4; `ORC-QNFDDQCFRA.35ccb5` |  |
| fcc |  | -9.04 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 3; `ORC-2SMDMCLMSH.5e8ac3` |  |
| fcc |  | -9.04 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 3, p. 6, row 5; `ORC-D7JF4G5AGH` |  |
| fcc |  | -8.861 kJ/mol-atom | 1473 | model |  |  | [1] Bratberg 2003 | Table 3, p. 6, row 8; `ORC-CYRMJB74CX` |  |
| fcc |  | -8.651 kJ/mol-atom | 1473 | model |  |  | [1] Bratberg 2003 | Table 3, p. 6, row 6; `ORC-GPKNUOX7S7` |  |
| fcc |  | -7.071 kJ/mol-atom | 1473 | model |  |  | [1] Bratberg 2003 | Table 3, p. 6, row 4; `ORC-MW3ZQJ6O7E` |  |
| fcc |  | -7.03 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 3, p. 6, row 3; `ORC-GNXKZJUIBK` |  |
| fcc |  | -7.03 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 2; `ORC-P5LQZ6SY3W.8f351d` |  |
| fcc |  | -4.1 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 1; `ORC-AU2XOWJ2LW.742aa0` |  |
| fcc |  | -4.1 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 3, p. 6, row 1; `ORC-WEIKVNCEON` |  |
| fcc |  | -3.821 kJ/mol-atom | 1473 | model |  |  | [1] Bratberg 2003 | Table 3, p. 6, row 2; `ORC-F6INHVTDKW` |  |
| σ |  | -11.225 kJ/mol-atom ± 0.85 | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 3, p. 6, row 11; `ORC-UJJXYBJ42H` |  |
| σ |  | -11.225 kJ/mol-atom ± 0.85 | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 6; `ORC-WF7GSIO23T.12951a` |  |
| σ |  | -11.005 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 3, p. 6, row 13; `ORC-5KBWMK5IJJ` |  |
| σ |  | -11.005 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 7; `ORC-IXDSYJ3JRZ.03b816` |  |
| σ |  | -10.88 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 3, p. 6, row 9; `ORC-FNHDX46H7J` |  |
| σ |  | -10.88 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 5; `ORC-Q6OEQ6HS6K.c27469` |  |
| σ |  | -10.87 kJ/mol-atom | 1473 | model |  |  | [1] Bratberg 2003 | Table 3, p. 6, row 12; `ORC-XLPKYJHMOI` |  |
| σ |  | -10.818 kJ/mol-atom | 1473 | model |  |  | [1] Bratberg 2003 | Table 3, p. 6, row 14; `ORC-HFSELBLM2Z` |  |
| σ |  | -10.805 kJ/mol-atom | 1473 | model |  |  | [1] Bratberg 2003 | Table 3, p. 6, row 10; `ORC-VQORDATBBU` |  |
| σ |  | -10.365 kJ/mol-atom | 1473 | model |  |  | [1] Bratberg 2003 | Table 3, p. 6, row 16; `ORC-C4MP5WGRG6` |  |
| σ |  | -10 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 8; `ORC-IUKOSILTDB.8d5254` |  |
| σ |  | -10 kJ/mol-atom | 1473 | experimental |  |  | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 3, p. 6, row 15; `ORC-TRZLG3DQPK` |  |
| σ |  | -1.9192 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 24; `ORC-3KFV6SG6OR` |  |
| σ |  | -0.2289 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 25; `ORC-BV3DGGBE7C` |  |
| σ |  | 0.7562 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 22; `ORC-C7T5SRREBV` |  |
| σ |  | 1.5473 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 23; `ORC-ZDHDJPBNKW` |  |
| σ |  | 5.6217 kJ/mol-atom | 0 | DFT |  |  | [4] Wang 2020 | Table 2, p. 20, row 21; `ORC-ABFFEBVUDH` |  |

## Other properties

### Phase equilibrium (6)

Table: Phase equilibrium, Co–V system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase composition |  | 973.15 | (αfCo) + Co3V; _(αfCo): Co 0.9439, V 0.0561; Co3V: Co 0.781, V 0.219_ | experimental | [2] Wang 2015 | Table 2, p. 3, row 6; `ORC-TGG5O3C7EC` |  |
| Phase composition |  | 1073.15 | (αfCo) + (αpCo); _(αfCo): Co 0.951, V 0.049; (αpCo): Co 0.9, V 0.1_ | experimental | [2] Wang 2015 | Table 2, p. 3, row 1; `ORC-RDRAHQSV2M` |  |
| Phase composition |  | 1073.15 | (αpCo) + Co3V; _(αpCo): Co 0.848, V 0.152; Co3V: Co 0.792, V 0.208_ | experimental | [2] Wang 2015 | Table 2, p. 3, row 2; `ORC-O4A3U4MUL6` |  |
| Phase composition |  | 1073.15 | Co3V + σ; _Co3V: Co 0.683, V 0.317; σ: Co 0.545, V 0.455_ | experimental | [2] Wang 2015 | Table 2, p. 3, row 3; `ORC-JTK6PI7X6O` |  |
| Phase composition |  | 1073.15 | CoV3 + (Cr, V); _CoV3: Co 0.244, V 0.756; (Cr, V): Co 0.037, V 0.963_ | experimental | [2] Wang 2015 | Table 2, p. 3, row 5; `ORC-3ITNFVBY5K` |  |
| Phase composition |  | 1073.15 | σ + CoV3; _σ: Co 0.302, V 0.698; CoV3: Co 0.244, V 0.756_ | experimental | [2] Wang 2015 | Table 2, p. 3, row 4; `ORC-A2BKWSJI6H` |  |

### Formation (20)

Table: Formation, Co–V system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy of formation; _printed: Entropy of Formation_ | 1.07 unknown | 1473 | bcc; _alloy: Co 0.05, V 0.95_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 10; `ORC-WKCNEY3JHT.2d1820` |  |
| Entropy of formation; _printed: Entropy of Formation_ | 1.57 unknown | 1473 | bcc; _alloy: Co 0.1, V 0.9_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 9; `ORC-XBRUG5EF45.8500e3` |  |
| Entropy of formation; _printed: Entropy of Formation_ | 1.81 unknown | 1473 | fcc; _alloy: Co 0.7, V 0.3_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 3; `ORC-2SMDMCLMSH.fecd8c` |  |
| Entropy of formation; _printed: Entropy of Formation_ | 1.07 unknown | 1473 | fcc; _alloy: Co 0.9, V 0.1_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 1; `ORC-AU2XOWJ2LW.ce6c2d` |  |
| Entropy of formation; _printed: Entropy of Formation_ | 1.52 unknown | 1473 | fcc; _alloy: Co 0.8, V 0.2_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 2; `ORC-P5LQZ6SY3W.c0b09f` |  |
| Entropy of formation; _printed: Entropy of Formation_ | 1.91 unknown | 1473 | fcc; _alloy: Co 0.65, V 0.35_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 4; `ORC-QNFDDQCFRA.60b1a0` |  |
| Entropy of formation; _printed: Entropy of Formation_ | 1.87 unknown | 1473 | σ; _alloy: Co 0.35, V 0.65_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 8; `ORC-IUKOSILTDB.f6648c` |  |
| Entropy of formation; _printed: Entropy of Formation_ | 1.79 unknown | 1473 | σ; _alloy: Co 0.4, V 0.6_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 7; `ORC-IXDSYJ3JRZ.b526c3` |  |
| Entropy of formation; _printed: Entropy of Formation_ | 1.96 unknown | 1473 | σ; _alloy: Co 0.55, V 0.45_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 5; `ORC-Q6OEQ6HS6K.4afe83` |  |
| Entropy of formation; _printed: Entropy of Formation_ | 1.91 unknown ± 2 | 1473 | σ; _alloy: Co 0.5, V 0.5_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 6; `ORC-WF7GSIO23T.14933f` |  |
| Gibbs energy of formation; _printed: Gibbs Energy of Formation_ | -3.021 kJ/mol-atom | 1473 | bcc; _alloy: Co 0.05, V 0.95_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 10; `ORC-WKCNEY3JHT.07ab4a` |  |
| Gibbs energy of formation; _printed: Gibbs Energy of Formation_ | -5.158 kJ/mol-atom | 1473 | bcc; _alloy: Co 0.1, V 0.9_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 9; `ORC-XBRUG5EF45.7f311c` |  |
| Gibbs energy of formation; _printed: Gibbs Energy of Formation_ | -11.706 kJ/mol-atom | 1473 | fcc; _alloy: Co 0.7, V 0.3_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 3; `ORC-2SMDMCLMSH.94311c` |  |
| Gibbs energy of formation; _printed: Gibbs Energy of Formation_ | -5.676 kJ/mol-atom | 1473 | fcc; _alloy: Co 0.9, V 0.1_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 1; `ORC-AU2XOWJ2LW.38d3f4` |  |
| Gibbs energy of formation; _printed: Gibbs Energy of Formation_ | -9.279 kJ/mol-atom | 1473 | fcc; _alloy: Co 0.8, V 0.2_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 2; `ORC-P5LQZ6SY3W.c8b3d3` |  |
| Gibbs energy of formation; _printed: Gibbs Energy of Formation_ | -12.563 kJ/mol-atom | 1473 | fcc; _alloy: Co 0.65, V 0.35_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 4; `ORC-QNFDDQCFRA.f8e04d` |  |
| Gibbs energy of formation; _printed: Gibbs Energy of Formation_ | -12.755 kJ/mol-atom | 1473 | σ; _alloy: Co 0.35, V 0.65_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 8; `ORC-IUKOSILTDB.c0244e` |  |
| Gibbs energy of formation; _printed: Gibbs Energy of Formation_ | -13.642 kJ/mol-atom | 1473 | σ; _alloy: Co 0.4, V 0.6_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 7; `ORC-IXDSYJ3JRZ.e5cd7c` |  |
| Gibbs energy of formation; _printed: Gibbs Energy of Formation_ | -13.767 kJ/mol-atom | 1473 | σ; _alloy: Co 0.55, V 0.45_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 5; `ORC-Q6OEQ6HS6K.76b610` |  |
| Gibbs energy of formation; _printed: Gibbs Energy of Formation_ | -14.068 kJ/mol-atom ± 3.8 | 1473 | σ; _alloy: Co 0.5, V 0.5_ | experimental | [1] Bratberg 2003; _cites Spencer 1976_ [doi](https://doi.org/10.1016/0021-9614%2876%2990028-8) | Table 2, p. 6, row 6; `ORC-WF7GSIO23T.fba13b` |  |

### Mixing / partial (2)

Table: Mixing / partial, Co–V system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Gibbs energy of mixing; _printed: ΔGmag_ | 0 kJ/mol (basis unstated) | 298.15 | σ; _alloy: Co 0.866, V 0.134_ | unspecified | [4] Wang 2020 | Table 4, p. 24, row 1; `ORC-5GKWY3GVHU` |  |
| Gibbs energy of mixing; _printed: ΔGmag_ | -3.849 kJ/mol (basis unstated) | 298.15 | σ; _alloy: Co 0.866, V 0.134_ | unspecified | [4] Wang 2020 | Table 4, p. 24, row 2; `ORC-TQ3GZVFBER` |  |

## Sources

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

1. Johan Bratberg, Bo Sundman, A thermodynamic assessment of the Co-V system, JPE 24, 495-503 (2003). [doi:10.1361/105497103772084534](https://doi.org/10.1361/105497103772084534)
2. Cuiping Wang, Cancan Zhao, Yong Lu, Tian Li, Dongliang Peng, Ji Shi et al., Experimental observation of magnetically induced phase separation and thermodynamic assessment in the Co–V binary system, Materials Chemistry and Physics 162, 555-560 (2015). [doi:10.1016/j.matchemphys.2015.06.028](https://doi.org/10.1016/j.matchemphys.2015.06.028)
3. Shuigen Huang, Lin Li, Omer Van der Biest, Jef Vleugels, Thermodynamic assessment of the Co–V and Co–V–C system, Journal of Alloys and Compounds 385, 114-118 (2004). [doi:10.1016/j.jallcom.2004.04.131](https://doi.org/10.1016/j.jallcom.2004.04.131)
4. Peisheng Wang, Thomas Hammerschmidt, Ursula R. Kattner, Gregory B. Olson, Structural stability of Co–V intermetallic phases and thermodynamic description of the Co–V system, Calphad 68, 101729 (2020). [doi:10.1016/j.calphad.2019.101729](https://doi.org/10.1016/j.calphad.2019.101729)

## 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/).