# Co–Y system

> Co–Y system: 85 accepted literature values (invariant reaction 62, formation 12, phase transition 11) 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-Y.html · Markdown: https://data.orchid-project.org/systems/CO-Y.md

85 accepted literature values from 2 paper(s) (experimental 29, model 32, DFT 8, unspecified 16); 4 calculated phase diagram(s). 4 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-Y.json) · [CSV](https://data.orchid-project.org/systems/CO-Y.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CO-Y) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CO-Y/CoY-04Du-LB.json) · [phases (15)](https://data.orchid-project.org/phases/pages/CO-Y.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CO-Y.html) · [Markdown](https://data.orchid-project.org/systems/CO-Y.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 29 |
| model | 32 |
| DFT | 8 |
| unspecified | 16 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 62 |
| phase transition | 11 |
| formation | 12 |

## 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 |
|---|---|---|---|
| CoY-04Du-LB.tdb | Z. Du, D. Lu, J. Alloys Compd., 373, 171-78(2004). [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050) | `054ec0f14cb5cb4cdf0cc85ce2b059fb43310f4cfc24c16949b17455f1570246` | [viewer](https://orchid-project.org/phase-diagrams/#CO-Y/CoY-04Du-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoY-04Du-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoY-04Du-LB.json) |
| CoY-06Gol.tdb | W. Golumbfskie, Z.-K. Liu, J. Alloys Compd., 407, 193-200(2006). [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037) | `aac7ff05f1475e50844ebcb446d5055f1be34dc36ef817d26749319a7385ec6a` | [viewer](https://orchid-project.org/phase-diagrams/#CO-Y/CoY-06Gol.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoY-06Gol.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoY-06Gol.json) |
| CoY-21Wan.tdb | Y. Wang, M. Ostrowska, G. Cacciamani, Calphad, 72, 102214(2021). [doi:10.1016/j.calphad.2020.102214](https://doi.org/10.1016/j.calphad.2020.102214) | `2ca9bae471245666dd130a85897ffc37488439a0ec08a4104a7dc1006338e31d` | [viewer](https://orchid-project.org/phase-diagrams/#CO-Y/CoY-21Wan.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoY-21Wan.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoY-21Wan.json) |
| CoY-96Du.tdb | Z. Du, W. Zhang, L. Zhao, Rare Met., 15, 185-90(1996). | `fdf8036fa6e999e0b95b1fc99ff231f8b0213f69fdf30aeeeb4a38d2f92149b5` | [viewer](https://orchid-project.org/phase-diagrams/#CO-Y/CoY-96Du.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoY-96Du.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoY-96Du.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CoY-04Du-LB.tdb | 1751.24 | LIQUID (x(Y) 0.98138) + HCP_A3 (x(Y) 0.99983) + BCC_A2 (x(Y) 0.99985) |
| CoY-04Du-LB.tdb | 1751.24 | LIQUID (x(Y) 0.98138) + HCP_A3 (x(Y) 0.99983) + BCC_A2 (x(Y) 0.99985) |
| CoY-04Du-LB.tdb | 1613.31 | FCC_A1 (x(Y) 9.500e-4) + CO17Y2 (x(Y) 0.1101) + LIQUID (x(Y) 0.11352) |
| CoY-04Du-LB.tdb | 1613.3 | CO17Y2 (x(Y) 0.11032) + LIQUID (x(Y) 0.11376) + CO17Y2#2 (x(Y) 0.13737) |
| CoY-04Du-LB.tdb | 1593.02 | CO17Y2 (x(Y) 0.16361) + CO7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.23577) |
| CoY-04Du-LB.tdb | 1580.83 | CO7Y2 (x(Y) 0.22222) + CO3Y (x(Y) 0.25) + LIQUID (x(Y) 0.27497) |
| CoY-04Du-LB.tdb | 1580.83 | CO7Y2 (x(Y) 0.22222) + CO3Y (x(Y) 0.25) + LIQUID (x(Y) 0.2748) |
| CoY-04Du-LB.tdb | 1426.96 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.41417) |
| CoY-04Du-LB.tdb | 1426.96 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.41394) |
| CoY-04Du-LB.tdb | 1426.96 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.4142) |
| CoY-04Du-LB.tdb | 1161.9 | LIQUID (x(Y) 0.73578) + COY3_D011 (x(Y) 0.75) + HCP_A3 (x(Y) 0.99864) |
| CoY-04Du-LB.tdb | 1161.9 | LIQUID (x(Y) 0.73574) + COY3_D011 (x(Y) 0.75) + HCP_A3 (x(Y) 0.99864) |
| CoY-04Du-LB.tdb | 1138.97 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.54316) |
| CoY-04Du-LB.tdb | 1138.97 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.54322) |
| CoY-04Du-LB.tdb | 1138.97 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.54305) |
| CoY-04Du-LB.tdb | 1092 | CO17Y2#2 (x(Y) 0.10584) + CO17Y2 (x(Y) 0.15784) + CO7Y2 (x(Y) 0.22222) |
| CoY-04Du-LB.tdb | 1070.97 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.57121) |
| CoY-04Du-LB.tdb | 1070.97 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.57129) |
| CoY-04Du-LB.tdb | 1070.97 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.57098) |
| CoY-04Du-LB.tdb | 1048 | CO3Y2 (x(Y) 0.4) + CO7Y6 (x(Y) 0.46154) + COY_B33 (x(Y) 0.5) |
| CoY-04Du-LB.tdb | 1012.6 | COY_B33 (x(Y) 0.5) + CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.61597) |
| CoY-04Du-LB.tdb | 1012.6 | COY_B33 (x(Y) 0.5) + CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.6159) |
| CoY-04Du-LB.tdb | 1012.6 | COY_B33 (x(Y) 0.5) + CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.6161) |
| CoY-04Du-LB.tdb | 1011.35 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62778) + COY3_D011 (x(Y) 0.75) |
| CoY-04Du-LB.tdb | 1011.35 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62773) + COY3_D011 (x(Y) 0.75) |
| CoY-04Du-LB.tdb | 1011.35 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62785) + COY3_D011 (x(Y) 0.75) |
| CoY-04Du-LB.tdb | 1011.35 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62785) + COY3_D011 (x(Y) 0.75) |
| CoY-04Du-LB.tdb | 1004.98 | COY_B33 (x(Y) 0.5) + CO3Y4 (x(Y) 0.57143) + CO5Y8 (x(Y) 0.61538) |
| CoY-04Du-LB.tdb | 694.99 | FCC_A1 (x(Y) 0) + HCP_A3 (x(Y) 0) + CO17Y2 (x(Y) 0.10526) |
| CoY-06Gol.tdb | 1752.54 | LIQUID (x(Y) 0.97881) + HCP_A3 (x(Y) 0.99756) + BCC_A2 (x(Y) 0.99783) |
| CoY-06Gol.tdb | 1618.41 | CO17Y2 (x(Y) 0.1102) + LIQUID (x(Y) 0.13647) + CO5Y_D2D (x(Y) 0.14956) |
| CoY-06Gol.tdb | 1615.02 | FCC_A1 (x(Y) 4.800e-4) + LIQUID (x(Y) 0.07029) + CO17Y2 (x(Y) 0.09622) |
| CoY-06Gol.tdb | 1587.48 | CO5Y_D2D (x(Y) 0.16853) + CO7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.22878) |
| CoY-06Gol.tdb | 1578.3 | CO7Y2 (x(Y) 0.22222) + CO3Y (x(Y) 0.25) + LIQUID (x(Y) 0.25949) |
| CoY-06Gol.tdb | 1578.29 | CO7Y2 (x(Y) 0.22222) + CO3Y (x(Y) 0.25) + LIQUID (x(Y) 0.25975) |
| CoY-06Gol.tdb | 1425.68 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.40551) |
| CoY-06Gol.tdb | 1425.68 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.40523) |
| CoY-06Gol.tdb | 1425.68 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.40552) |
| CoY-06Gol.tdb | 1160.32 | LIQUID (x(Y) 0.72569) + COY3_D011 (x(Y) 0.75) + HCP_A3 (x(Y) 0.99327) |
| CoY-06Gol.tdb | 1160.32 | LIQUID (x(Y) 0.72567) + COY3_D011 (x(Y) 0.75) + HCP_A3 (x(Y) 0.99327) |
| CoY-06Gol.tdb | 1138.05 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.55212) |
| CoY-06Gol.tdb | 1138.05 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.55219) |
| CoY-06Gol.tdb | 1138.05 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.55203) |
| CoY-06Gol.tdb | 1068.5 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.58253) |
| CoY-06Gol.tdb | 1068.5 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.5826) |
| CoY-06Gol.tdb | 1068.5 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.58228) |
| CoY-06Gol.tdb | 1048.03 | CO3Y2 (x(Y) 0.4) + CO7Y6 (x(Y) 0.46154) + COY_B33 (x(Y) 0.5) |
| CoY-06Gol.tdb | 1012.08 | COY_B33 (x(Y) 0.5) + CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62196) |
| CoY-06Gol.tdb | 1012.07 | COY_B33 (x(Y) 0.5) + CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.6218) |
| CoY-06Gol.tdb | 1012.07 | COY_B33 (x(Y) 0.5) + CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62171) |
| CoY-06Gol.tdb | 1011.66 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62526) + COY3_D011 (x(Y) 0.75) |
| CoY-06Gol.tdb | 1011.66 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62519) + COY3_D011 (x(Y) 0.75) |
| CoY-06Gol.tdb | 1011.66 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62534) + COY3_D011 (x(Y) 0.75) |
| CoY-06Gol.tdb | 1011.66 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62535) + COY3_D011 (x(Y) 0.75) |
| CoY-06Gol.tdb | 1004.62 | COY_B33 (x(Y) 0.5) + CO3Y4 (x(Y) 0.57143) + CO5Y8 (x(Y) 0.61538) |
| CoY-06Gol.tdb | 968.38 | CO17Y2 (x(Y) 0.1053) + CO5Y_D2D (x(Y) 0.17516) + CO7Y2 (x(Y) 0.22222) |
| CoY-06Gol.tdb | 694.99 | FCC_A1 (x(Y) 0) + HCP_A3 (x(Y) 0) + CO17Y2 (x(Y) 0.10526) |
| CoY-06Gol.tdb | 304.79 | CO7Y6 (x(Y) 0.46154) + COY_B33 (x(Y) 0.5) + CO3Y4 (x(Y) 0.57143) |
| CoY-21Wan.tdb | 1752.08 | LIQUID (x(Y) 0.97895) + HCP_A3 (x(Y) 0.99837) + BCC_A2 (x(Y) 0.99855) |
| CoY-21Wan.tdb | 1629.15 | FCC_A1 (x(Y) 4.200e-4) + LIQUID (x(Y) 0.0698) + CO17Y2 (x(Y) 0.09531) |
| CoY-21Wan.tdb | 1628.09 | CO17Y2 (x(Y) 0.10995) + LIQUID (x(Y) 0.1427) + CO5Y_D2D (x(Y) 0.14909) |
| CoY-21Wan.tdb | 1586.06 | CO5Y_D2D (x(Y) 0.16764) + CO7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.2368) |
| CoY-21Wan.tdb | 1577.12 | CO7Y2 (x(Y) 0.22222) + CO3Y (x(Y) 0.25) + LIQUID (x(Y) 0.26167) |
| CoY-21Wan.tdb | 1577.12 | CO7Y2 (x(Y) 0.22222) + CO3Y (x(Y) 0.25) + LIQUID (x(Y) 0.26148) |
| CoY-21Wan.tdb | 1423.52 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.40249) |
| CoY-21Wan.tdb | 1423.52 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.40229) |
| CoY-21Wan.tdb | 1423.52 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.40251) |
| CoY-21Wan.tdb | 1155.13 | LIQUID (x(Y) 0.72586) + COY3_D011 (x(Y) 0.75) + HCP_A3 (x(Y) 0.99511) |
| CoY-21Wan.tdb | 1134 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.54735) |
| CoY-21Wan.tdb | 1134 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.54741) |
| CoY-21Wan.tdb | 1134 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.54723) |
| CoY-21Wan.tdb | 1066.27 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.57905) |
| CoY-21Wan.tdb | 1066.27 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.57915) |
| CoY-21Wan.tdb | 1066.27 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.57903) |
| CoY-21Wan.tdb | 1048.23 | CO3Y2 (x(Y) 0.4) + CO7Y6 (x(Y) 0.46154) + COY_B33 (x(Y) 0.5) |
| CoY-21Wan.tdb | 1011.64 | COY_B33 (x(Y) 0.5) + CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62199) |
| CoY-21Wan.tdb | 1011.64 | COY_B33 (x(Y) 0.5) + CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.622) |
| CoY-21Wan.tdb | 1011.54 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62308) + COY3_D011 (x(Y) 0.75) |
| CoY-21Wan.tdb | 1011.54 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62306) + COY3_D011 (x(Y) 0.75) |
| CoY-21Wan.tdb | 999.88 | COY_B33 (x(Y) 0.5) + CO3Y4 (x(Y) 0.57143) + CO5Y8 (x(Y) 0.61538) |
| CoY-21Wan.tdb | 968.12 | CO17Y2 (x(Y) 0.10541) + CO5Y_D2D (x(Y) 0.1746) + CO7Y2 (x(Y) 0.22222) |
| CoY-21Wan.tdb | 694.99 | FCC_A1 (x(Y) 0) + HCP_A3 (x(Y) 0) + CO17Y2 (x(Y) 0.10526) |
| CoY-96Du.tdb | 1751.15 | LIQUID (x(Y) 0.98169) + HCP_A3 (x(Y) 1) + BCC_A2 (x(Y) 1) |
| CoY-96Du.tdb | 1751.15 | LIQUID (x(Y) 0.98165) + BCC_A2 (x(Y) 1) + HCP_A3 (x(Y) 1) |
| CoY-96Du.tdb | 1751.15 | LIQUID (x(Y) 0.98168) + HCP_A3 (x(Y) 1) + BCC_A2 (x(Y) 1) |
| CoY-96Du.tdb | 1751.15 | LIQUID (x(Y) 0.98166) + BCC_A2 (x(Y) 1) + HCP_A3 (x(Y) 1) |
| CoY-96Du.tdb | 1614.28 | FCC_A1 (x(Y) 0) + LIQUID (x(Y) 0.07442) + CO17Y2 (x(Y) 0.10526) |
| CoY-96Du.tdb | 1614.28 | FCC_A1 (x(Y) 0) + LIQUID (x(Y) 0.07448) + CO17Y2 (x(Y) 0.10526) |
| CoY-96Du.tdb | 1614.28 | FCC_A1 (x(Y) 0) + LIQUID (x(Y) 0.07444) + CO17Y2 (x(Y) 0.10526) |
| CoY-96Du.tdb | 1614.28 | FCC_A1 (x(Y) 0) + LIQUID (x(Y) 0.07435) + CO17Y2 (x(Y) 0.10526) |
| CoY-96Du.tdb | 1612.99 | CO17Y2 (x(Y) 0.10526) + LIQUID (x(Y) 0.14151) + CO5Y_D2D (x(Y) 0.16667) |
| CoY-96Du.tdb | 1612.99 | CO17Y2 (x(Y) 0.10526) + LIQUID (x(Y) 0.14123) + CO5Y_D2D (x(Y) 0.16667) |
| CoY-96Du.tdb | 1593.04 | CO5Y_D2D (x(Y) 0.16667) + CO7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.22986) |
| CoY-96Du.tdb | 1593.03 | CO5Y_D2D (x(Y) 0.16667) + CO7Y2 (x(Y) 0.22222) + LIQUID (x(Y) 0.23022) |
| CoY-96Du.tdb | 1579.2 | CO7Y2 (x(Y) 0.22222) + CO3Y (x(Y) 0.25) + LIQUID (x(Y) 0.26939) |
| CoY-96Du.tdb | 1579.19 | CO7Y2 (x(Y) 0.22222) + CO3Y (x(Y) 0.25) + LIQUID (x(Y) 0.26902) |
| CoY-96Du.tdb | 1579.19 | CO7Y2 (x(Y) 0.22222) + CO3Y (x(Y) 0.25) + LIQUID (x(Y) 0.26879) |
| CoY-96Du.tdb | 1426.47 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.40699) |
| CoY-96Du.tdb | 1426.47 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.4069) |
| CoY-96Du.tdb | 1426.47 | CO3Y (x(Y) 0.25) + CO2Y_C15 (x(Y) 0.33333) + LIQUID (x(Y) 0.407) |
| CoY-96Du.tdb | 1168.59 | LIQUID (x(Y) 0.73013) + COY3_D011 (x(Y) 0.75) + HCP_A3 (x(Y) 1) |
| CoY-96Du.tdb | 1168.59 | LIQUID (x(Y) 0.73032) + COY3_D011 (x(Y) 0.75) + HCP_A3 (x(Y) 1) |
| CoY-96Du.tdb | 1168.58 | LIQUID (x(Y) 0.73022) + COY3_D011 (x(Y) 0.75) + HCP_A3 (x(Y) 1) |
| CoY-96Du.tdb | 1168.58 | LIQUID (x(Y) 0.73019) + COY3_D011 (x(Y) 0.75) + HCP_A3 (x(Y) 1) |
| CoY-96Du.tdb | 1143.83 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.55617) |
| CoY-96Du.tdb | 1143.83 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.5562) |
| CoY-96Du.tdb | 1143.83 | CO2Y_C15 (x(Y) 0.33333) + CO3Y2 (x(Y) 0.4) + LIQUID (x(Y) 0.55604) |
| CoY-96Du.tdb | 1096.4 | CO17Y2 (x(Y) 0.10526) + CO5Y_D2D (x(Y) 0.16667) + CO7Y2 (x(Y) 0.22222) |
| CoY-96Du.tdb | 1077.67 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.58385) |
| CoY-96Du.tdb | 1077.67 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.58396) |
| CoY-96Du.tdb | 1077.67 | CO3Y2 (x(Y) 0.4) + COY_B33 (x(Y) 0.5) + LIQUID (x(Y) 0.58359) |
| CoY-96Du.tdb | 1049.19 | CO3Y2 (x(Y) 0.4) + CO7Y6 (x(Y) 0.46154) + COY_B33 (x(Y) 0.5) |
| CoY-96Du.tdb | 1022.39 | COY_B33 (x(Y) 0.5) + CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.61962) |
| CoY-96Du.tdb | 1022.39 | COY_B33 (x(Y) 0.5) + CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.61954) |
| CoY-96Du.tdb | 1022.02 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62325) + COY3_D011 (x(Y) 0.75) |
| CoY-96Du.tdb | 1022.02 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62323) + COY3_D011 (x(Y) 0.75) |
| CoY-96Du.tdb | 1022.02 | CO5Y8 (x(Y) 0.61538) + LIQUID (x(Y) 0.62332) + COY3_D011 (x(Y) 0.75) |
| CoY-96Du.tdb | 1007.11 | COY_B33 (x(Y) 0.5) + CO3Y4 (x(Y) 0.57143) + CO5Y8 (x(Y) 0.61538) |
| CoY-96Du.tdb | 694.99 | HCP_A3 (x(Y) 0) + FCC_A1 (x(Y) 0) + CO17Y2 (x(Y) 0.10526) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CO/CO-Y.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CO/CO-Y.json) · [CALPHAD hull CoY-04Du-LB](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-Y--CoY-04Du-LB.json) · [CALPHAD hull CoY-06Gol](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-Y--CoY-06Gol.json) · [CALPHAD hull CoY-96Du](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-Y--CoY-96Du.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Co–Y system (62)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1795 | congruent melting: L -> β-Y | β-Y: Y 1 | experimental | [1] Golumbfskie 2006; _cites Gschneidner 1986_ [doi](https://doi.org/10.1016/s0168-1273%2886%2908004-2) | Table 2, p. 2, row 36; `ORC-I32H7PWU6F` |  |
| 1795 | congruent melting: L -> β-Y | β-Y: Y 1 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 35; `ORC-MUAJBZ3DJR` |  |
| 1768 | congruent melting: L -> α-Co | α-Co: Y 0 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 3; `ORC-7QYLVYNY6R` |  |
| 1768 | congruent melting: L -> α-Co | α-Co: Y 0 | experimental | [1] Golumbfskie 2006; _cites Okamoto 1992_ [doi](https://doi.org/10.1007/bf02667566) | Table 2, p. 2, row 4; `ORC-DLKARD623G` |  |
| 1751 | Liq. + bcc(Y) -> hcp(Y) | L: Y 0.9814; bcc(Y): Y 0.9999; hcp(Y): Y 0.9998 | model | [2] Du 2004 | Table 4, p. 7, row 31; `ORC-RMNGHTW3ND` |  |
| 1751 | Liq. + bcc(Y) -> hcp(Y) | L: Y 0.98; bcc(Y): Y 1; hcp(Y): Y 1 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 32; `ORC-UYWCXMOXFC` |  |
| 1630 | congruent melting: L -> β-Co17Y2 | L: Y 0.11; β-Co17Y2: Y 0.11 | experimental | [1] Golumbfskie 2006; _cites Wu 1991_ | Table 2, p. 2, row 8; `ORC-QABC35TYVI` |  |
| 1625 | congruent melting: L -> β-Co17Y2 | L: Y 0.106; β-Co17Y2: Y 0.106 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 7; `ORC-6V6M2BZJ3P` |  |
| 1620 | congruent melting: L -> Co5Y | L: Y 0.153; Co5Y: Y 0.153 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 11; `ORC-VUD56WG274` |  |
| 1618 | eutectic: L -> β-Co17Y2 + Co5Y | L: Y 0.1359; β-Co17Y2: Y 0.1102; Co5Y: Y 0.1494 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 9; `ORC-KO5LHXAI4Y` |  |
| 1618 | congruent melting: L -> Co5Y | L: Y 0.156; Co5Y: Y 0.156 | experimental | [1] Golumbfskie 2006; _cites Khan 1974_ | Table 2, p. 2, row 12; `ORC-KTLGBNC665` |  |
| 1615 | eutectic: L -> (α-Co) + β-Co17Y2 | L: Y 0.0702; (α-Co): Y 0; β-Co17Y2: Y 0.0961 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 5; `ORC-OPXV5MSDMM` |  |
| 1613 | Liq.+ fcc (Co) -> Co17Y2^a | L: Y 0.07; fcc(Co): Y 0; Co17Y2: Y 0.1 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 2; `ORC-D32TSKKCQ3` |  |
| 1613 | eutectic: Liq. -> Co17Y2 + Co5Y | L: Y 0.1138; Co17Y2: Y 0.1103; Co5Y: Y 0.1374 | model | [2] Du 2004 | Table 4, p. 7, row 5; `ORC-JUJP6XBNR4.9da013` |  |
| 1613 | Liq.+ fcc (Co) -> Co17Y2^a | L: Y 0.1135; fcc(Co): Y 0.001; Co17Y2: Y 0.1058 | model | [2] Du 2004 | Table 4, p. 7, row 1; `ORC-JUJP6XBNR4.ae5c2a` |  |
| 1613 | eutectic: L -> (α-Co) + β-Co17Y2 | L: Y 0.07; (α-Co): Y 0.005; β-Co17Y2: Y 0.1 | experimental | [1] Golumbfskie 2006; _cites Pelleg 1965_ [doi](https://doi.org/10.1016/0022-5088%2865%2990021-4) | Table 2, p. 2, row 6; `ORC-UAMRLAFLL7` |  |
| 1607 | eutectic: Liq. -> Co17Y2 + Co5Y | L: Y 0.116; Co17Y2: Y 0.11; Co5Y: Y 0.14 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 6; `ORC-3FOYODQ7BA` |  |
| 1607 | eutectic: L -> β-Co17Y2 + Co5Y | L: Y 0.1157; β-Co17Y2: Y 0.11; Co5Y: Y 0.14 | experimental | [1] Golumbfskie 2006; _cites Khan 1974_ | Table 2, p. 2, row 10; `ORC-4CHBWNSPP3` |  |
| 1593 | L + Co5Y -> Co7Y2 | L: Y 0.29; Co5Y: Y 0.175; Co7Y2: Y 0.222 | experimental | [1] Golumbfskie 2006; _cites Wu 1991_ | Table 2, p. 2, row 14; `ORC-5Z2SAPWTM4` |  |
| 1593 | Liq. + Co5Y -> Co7Y2 | L: Y 0.28; Co5Y: Y 0.17; Co7Y2: Y 0.222222 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 12; `ORC-DP5YCUKHQT` |  |
| 1593 | Liq. + Co5Y -> Co7Y2 | L: Y 0.2358; Co5Y: Y 0.1636; Co7Y2: Y 0.222222 | model | [2] Du 2004 | Table 4, p. 7, row 11; `ORC-WW6WSCPJRI` |  |
| 1588 | L + Co5Y -> Co7Y2 | L: Y 0.2287; Co5Y: Co 0.833333, Y 0.166667; Co7Y2: Co 0.777778, Y 0.222222 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 13; `ORC-N47E77EKIB` |  |
| 1581 | L + Co7Y2 -> Co3Y | L: Y 0.315; Co7Y2: Y 0.222; Co3Y: Y 0.25 | experimental | [1] Golumbfskie 2006; _cites Wu 1991_ | Table 2, p. 2, row 16; `ORC-FDT4TZ6SR3` |  |
| 1581 | Liq. + Co7Y2 -> Co3Y | L: Y 0.3; Co7Y2: Y 0.222222; Co3Y: Y 0.25 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 14; `ORC-TJUKJCE2CX` |  |
| 1581 | Liq. + Co7Y2 -> Co3Y | L: Y 0.275; Co7Y2: Y 0.222222; Co3Y: Y 0.25 | model | [2] Du 2004 | Table 4, p. 7, row 13; `ORC-ZDVVTGON7A` |  |
| 1578 | L + Co7Y2 -> Co3Y | L: Y 0.2598; Co7Y2: Co 0.777778, Y 0.222222; Co3Y: Co 0.75, Y 0.25 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 15; `ORC-EDB5GOMJX7` |  |
| 1427 | L + Co3Y -> Co2Y | L: Y 0.432; Co3Y: Y 0.25; Co2Y: Y 0.333 | experimental | [1] Golumbfskie 2006; _cites Wu 1991_ | Table 2, p. 2, row 18; `ORC-7MCTSGCTUL` |  |
| 1427 | Liq. + Co3Y -> Co2Y | L: Y 0.43; Co3Y: Y 0.25; Co2Y: Y 0.333333 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 16; `ORC-EOXY3SF6KR` |  |
| 1427 | Liq. + Co3Y -> Co2Y | L: Y 0.4142; Co3Y: Y 0.25; Co2Y: Y 0.333333 | model | [2] Du 2004 | Table 4, p. 7, row 15; `ORC-I6KZXGJKXU` |  |
| 1426 | L + Co3Y -> Co2Y | L: Y 0.4055; Co3Y: Co 0.75, Y 0.25; Co2Y: Co 0.666667, Y 0.333333 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 17; `ORC-4CMEDZSFL3` |  |
| 1162 | Liq. + hcp(Y) -> CoY3 | L: Y 0.71; hcp(Y): Y 1; CoY3: Y 0.75 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 30; `ORC-ATYWVXUDBX` |  |
| 1162 | L+(α-Y) -> CoY3 | L: Y 0.714; (α-Y): Y 1; CoY3: Y 0.75 | experimental | [1] Golumbfskie 2006; _cites Wu 1991_ | Table 2, p. 2, row 32; `ORC-JDAPZX6N3Y` |  |
| 1162 | Liq. + hcp(Y) -> CoY3 | L: Y 0.7358; hcp(Y): Y 0.9986; CoY3: Y 0.75 | model | [2] Du 2004 | Table 4, p. 7, row 29; `ORC-MY2OQJZHID` |  |
| 1160 | L+(α-Y) -> CoY3 | L: Y 0.726; CoY3: Co 0.25, Y 0.75 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 31; `ORC-HDAJLYMPGI` |  |
| 1139 | Liq. + Co2Y -> Co3Y2 | L: Y 0.55; Co2Y: Y 0.333333; Co3Y2: Y 0.4 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 18; `ORC-7AK4NYMHT4` |  |
| 1139 | Liq. + Co2Y -> Co3Y2 | L: Y 0.5432; Co2Y: Y 0.333333; Co3Y2: Y 0.4 | model | [2] Du 2004 | Table 4, p. 7, row 17; `ORC-7QQKLDHQE2` |  |
| 1139 | L + Co2Y -> Co3Y2 | L: Y 0.555; Co2Y: Y 0.333; Co3Y2: Y 0.4 | experimental | [1] Golumbfskie 2006; _cites Wu 1991_ | Table 2, p. 2, row 20; `ORC-UENGBSIBPA` |  |
| 1138 | L + Co2Y -> Co3Y2 | L: Y 0.5521; Co2Y: Co 0.666667, Y 0.333333; Co3Y2: Co 0.6, Y 0.4 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 19; `ORC-VTX2QBBSYC` |  |
| 1092 | Co5Y -> Co17Y2 + Co7Y2 | Co5Y: Y 0.1578; Co17Y2: Y 0.1058; Co7Y2: Y 0.222222 | model | [2] Du 2004 | Table 4, p. 7, row 9; `ORC-B6GXBFCHBC` |  |
| 1092 | Co5Y -> Co17Y2 + Co7Y2 | Co5Y: Y 0.167; Co17Y2: Y 0.105; Co7Y2: Y 0.222222 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 10; `ORC-G5ZBOZGPU2` |  |
| 1071 | L + Co3Y2 -> CoY | L: Y 0.588; Co3Y2: Y 0.4; CoY: Y 0.5 | experimental | [1] Golumbfskie 2006; _cites Wu 1991_ | Table 2, p. 2, row 24; `ORC-QEZX4HA3L4` |  |
| 1071 | Liq. + Co3Y2 -> CoY | L: Y 0.59; Co3Y2: Y 0.4; CoY: Y 0.5 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 20; `ORC-RL7IZPHJFY` |  |
| 1071 | Liq. + Co3Y2 -> CoY | L: Y 0.5712; Co3Y2: Y 0.4; CoY: Y 0.5 | model | [2] Du 2004 | Table 4, p. 7, row 19; `ORC-SWGWMIMXXZ` |  |
| 1069 | L + Co3Y2 -> CoY | L: Y 0.5825; Co3Y2: Co 0.6, Y 0.4; CoY: Co 0.5, Y 0.5 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 23; `ORC-QQ4QXCH6IV` |  |
| 1048 | Co3Y2 + CoY -> Co7Y6 | Co3Y2: Y 0.4; CoY: Y 0.5; Co7Y6: Y 0.461538 | model | [2] Du 2004 | Table 4, p. 7, row 21; `ORC-BZ74NNU44F` |  |
| 1048 | Co3Y2 + CoY -> Co7Y6 | Co3Y2: Y 0.4; CoY: Y 0.5; Co7Y6: Y 0.454 | experimental | [1] Golumbfskie 2006; _cites Wu 1991_ | Table 2, p. 2, row 22; `ORC-HDQTCRWMRC` |  |
| 1048 | Co3Y2 + CoY -> Co7Y6 | Co3Y2: Y 0.4; CoY: Y 0.5; Co7Y6: Y 0.461538 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 22; `ORC-HMKHUIBFZH` |  |
| 1048 | Co3Y2 + CoY -> Co7Y6 | Co3Y2: Y 0.5; CoY: Y 0.5; Co7Y6: Co 0.538462, Y 0.461538 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 21; `ORC-SREJT6PQIL` |  |
| 1013 | Liq. + CoY -> Co5Y8 | L: Y 0.63; CoY: Y 0.5; Co5Y8: Y 0.615385 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 24; `ORC-HVEK5ZA2WN` |  |
| 1013 | Liq. + CoY -> Co5Y8 | L: Y 0.616; CoY: Y 0.5; Co5Y8: Y 0.615385 | model | [2] Du 2004 | Table 4, p. 7, row 23; `ORC-IG6UB4IZYV` |  |
| 1013 | L + CoY -> Co5Y8 | L: Y 0.633; CoY: Y 0.5; Co5Y8: Y 0.615 | experimental | [1] Golumbfskie 2006; _cites Grover 1982_ [doi](https://doi.org/10.1016/0022-5088%2882%2990186-2) | Table 2, p. 2, row 28; `ORC-XXFHGD3ZB3` |  |
| 1012 | L + CoY -> Co5Y8 | L: Y 0.6218; CoY: Co 0.5, Y 0.5; Co5Y8: Co 0.384615, Y 0.615385 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 27; `ORC-24DMG5VR25` |  |
| 1012 | eutectic: L -> CoY3 + Co5Y8 | L: Y 0.6253; CoY3: Co 0.25, Y 0.75; Co5Y8: Co 0.384615, Y 0.615385 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 29; `ORC-HPQLIK6HGJ` |  |
| 1011 | eutectic: L -> CoY3 + Co5Y8 | L: Y 0.63; CoY3: Y 0.75; Co5Y8: Y 0.615 | experimental | [1] Golumbfskie 2006; _cites Wu 1991_ | Table 2, p. 2, row 30; `ORC-H2WZFHKWEZ` |  |
| 1011 | eutectic: Liq. -> Co5Y8 + CoY3 | L: Y 0.63; Co5Y8: Y 0.615385; CoY3: Y 0.75 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 28; `ORC-NDLYE2RER3` |  |
| 1011 | eutectic: Liq. -> Co5Y8 + CoY3 | L: Y 0.6278; Co5Y8: Y 0.615385; CoY3: Y 0.75 | model | [2] Du 2004 | Table 4, p. 7, row 27; `ORC-UQWWHOHNXW` |  |
| 1005 | Co5Y8 + CoY -> Co3Y4 | Co5Y8: Y 0.615385; CoY: Y 0.5; Co3Y4: Y 0.571429 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 26; `ORC-3NADFUQGXC` |  |
| 1005 | YCo + Co5Y8 -> Co3Y4 | YCo: Y 0.5; Co5Y8: Y 0.615; Co3Y4: Y 0.571 | experimental | [1] Golumbfskie 2006; _cites Wu 1991_ | Table 2, p. 2, row 26; `ORC-5RZR5NUGQR` |  |
| 1005 | YCo + Co5Y8 -> Co3Y4 | YCo: Y 0.615; Co5Y8: Y 0.615; Co3Y4: Co 0.428571, Y 0.571429 | model | [1] Golumbfskie 2006 | Table 2, p. 2, row 25; `ORC-EUD5JTHGO6` |  |
| 1005 | Co5Y8 + CoY -> Co3Y4 | Co5Y8: Y 0.615385; CoY: Y 0.5; Co3Y4: Y 0.571429 | model | [2] Du 2004 | Table 4, p. 7, row 25; `ORC-ZM2OZIN57W` |  |
| 695 | fcc(Co) -> Co17Y2+hcp(Co) | fcc(Co): Y 0; Co17Y2: Y 0.105; hcp(Co): Y 0 | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 4; `ORC-4ASD2DMAID` |  |
| 695 | fcc(Co) -> Co17Y2+hcp(Co) | fcc(Co): Y 0; Co17Y2: Y 0.1053; hcp(Co): Y 0 | model | [2] Du 2004 | Table 4, p. 7, row 3; `ORC-TKZ2NQJYDH` |  |

## 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–Y system (12)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| (Co2)(Co)4(Co) |  | 12.94 kJ/mol-atom | 0 | DFT |  |  | [1] Golumbfskie 2006 | Table 4, p. 3, row 7; `ORC-BWI2GTLMPV` |  |
| (Co2)(Co)4(Va) |  | 25.81 kJ/mol-atom | 0 | DFT |  |  | [1] Golumbfskie 2006 | Table 4, p. 3, row 6; `ORC-4WGAXOZP4I` |  |
| (Y)(Co)4(Va) |  | 16.31 kJ/mol-atom | 0 | DFT |  |  | [1] Golumbfskie 2006 | Table 4, p. 3, row 5; `ORC-ATSABSXOJH` |  |
| Co17Y2 |  | -10.35 kJ/mol-atom | 0 | DFT |  |  | [1] Golumbfskie 2006 | Table 4, p. 3, row 1; `ORC-XZYHBRXU6W` |  |
| Co17Y2 | [Co17Y2](https://data.orchid-project.org/compounds/Co17Y2.html) | -7.6 kJ/mol-atom ± 0.8 | 298.15 | experimental | -9.092 (mp-aaackyhw) | -10.589 (oqmd-29527) | [1] Golumbfskie 2006; _cites Subramanian 1985_ [doi](https://doi.org/10.1007/bf02670324) | Table 4, p. 3, row 14; `ORC-2BBVVIXWTO` |  |
| Co2Y | [Co2Y](https://data.orchid-project.org/compounds/Co2Y.html) | -22.76 kJ/mol-atom ± 1.33 | 298.15 | experimental | -17.069 (mp-aaaaabxu) | -18.206 (oqmd-19394) | [1] Golumbfskie 2006; _cites Subramanian 1985_ [doi](https://doi.org/10.1007/bf02670324) | Table 4, p. 3, row 17; `ORC-S46LFTJSEB` |  |
| Co2Y |  | -19.29 kJ/mol-atom | 0 | DFT |  |  | [1] Golumbfskie 2006 | Table 4, p. 3, row 16; `ORC-NQCKQH4Z2H` |  |
| CoY |  | -23.14 kJ/mol-atom | 0 | DFT |  |  | [1] Golumbfskie 2006 | Table 4, p. 3, row 10; `ORC-MS7XFUO2GK` |  |
| CoY3 |  | -16.96 kJ/mol-atom | 0 | DFT |  |  | [1] Golumbfskie 2006 | Table 4, p. 3, row 12; `ORC-QQWL4KHWNN` |  |
| CoY3 | [CoY3](https://data.orchid-project.org/compounds/CoY3.html) | -15.8 kJ/mol-atom ± 4.98 | 298.15 | experimental | -13.914 (mp-aaackxna) | -14.674 (oqmd-664091) | [1] Golumbfskie 2006; _cites Subramanian 1985_ [doi](https://doi.org/10.1007/bf02670324) | Table 4, p. 3, row 18; `ORC-346I5F5EQH` |  |
| Y(Co)4(Co) |  | -12.2 kJ/mol-atom ± 0.87 | 298.15 | experimental |  |  | [1] Golumbfskie 2006; _cites Subramanian 1985_ [doi](https://doi.org/10.1007/bf02670324) | Table 4, p. 3, row 15; `ORC-WCOLL7LC4B` |  |
| Y(Co)4(Co) |  | -9.42 kJ/mol-atom | 0 | DFT |  |  | [1] Golumbfskie 2006 | Table 4, p. 3, row 3; `ORC-PDU2ZO4NPM` |  |

## Other properties

### Phase transition (11)

Table: Phase transition, Co–Y system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 2 K | 2 | magnetic: CoY₃ | experimental | [2] Du 2004 | Table 2, p. 4, row 7; `ORC-2AV3RLD3DL` |  |
| Phase transition | 13 K | 13 | magnetic: Co₃Y₄ | experimental | [2] Du 2004 | Table 2, p. 4, row 6; `ORC-T7WYEI3BAG` |  |
| Phase transition | 296 K | 296 | magnetic: Co₂Y | experimental | [2] Du 2004 | Table 2, p. 4, row 5; `ORC-WTWVWIY4OL` |  |
| Phase transition | 305 K | 305 | magnetic: Co₃Y | experimental | [2] Du 2004 | Table 2, p. 4, row 4; `ORC-OXRERKKFVC` |  |
| Phase transition | 639 K | 639 | magnetic: Co₇Y₂ | experimental | [2] Du 2004 | Table 2, p. 4, row 3; `ORC-YKHIS7KO2H` |  |
| Phase transition | 977 K | 977 | magnetic: Co₅Y | experimental | [1] Golumbfskie 2006 | Table 5, p. 3, row 4; `ORC-E6OC2OMJ5Q` |  |
| Phase transition | 977 K | 977 | magnetic: Co₅Y | experimental | [2] Du 2004 | Table 2, p. 4, row 2; `ORC-NQ6KQL7NNM` |  |
| Phase transition | 1167 K | 1167 | magnetic: Co₁₇Y₂ | experimental | [2] Du 2004 | Table 2, p. 4, row 1; `ORC-BK5BVJR2DH` |  |
| Phase transition | 1167 K | 1167 | magnetic: Co₁₇Y₂ | experimental | [1] Golumbfskie 2006 | Table 5, p. 3, row 2; `ORC-RYRKWPO76V` |  |
| Phase transition | 1618 K | 1618 | Liq. -> Co5Y; _L: Y 0.16; Co5Y: Y 0.166667_ | unspecified | [2] Du 2004; _cites Conclusions_ | Table 4, p. 7, row 8; `ORC-I3WVVPYDWS` |  |
| Phase transition | 1618 K | 1618 | Liq. -> Co5Y; _L: Y 0.1547; Co5Y: Y 0.166667_ | model | [2] Du 2004 | Table 4, p. 7, row 7; `ORC-LMHII43CUN` |  |

## Sources

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

1. William Golumbfskie, Zi-Kui Liu, CALPHAD/first-principles re-modeling of the Co–Y binary system, Journal of Alloys and Compounds 407, 193-200 (2006). [doi:10.1016/j.jallcom.2005.06.037](https://doi.org/10.1016/j.jallcom.2005.06.037)
2. Zhenmin Du, Dongxian Lü, Thermodynamic modelling of the Co–Y system, Journal of Alloys and Compounds 373, 171-178 (2004). [doi:10.1016/j.jallcom.2003.10.050](https://doi.org/10.1016/j.jallcom.2003.10.050)

## 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/).