# Co–Gd system

> Co–Gd system: 42 accepted literature values (invariant reaction 24, phase transition 17, heat capacity / entropy / enthalpy 1) and 2 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

42 accepted literature values from 1 paper(s) (experimental 31, model 11); 2 calculated phase diagram(s). 3 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-GD.json) · [CSV](https://data.orchid-project.org/systems/CO-GD.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#CO-GD) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#CO-GD/CoGd-10Wan.json) · [phases (13)](https://data.orchid-project.org/phases/pages/CO-GD.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/CO-GD.html) · [Markdown](https://data.orchid-project.org/systems/CO-GD.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 31 |
| model | 11 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 24 |
| phase transition | 17 |
| heat capacity / entropy / enthalpy | 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 |
|---|---|---|---|
| CoGd-10Wan.tdb | W. Wang, C. Guo, C. Li, Z. Du, Int. J. Mater. Res., 101, 1339-46(2010). [doi:10.3139/146.110415](https://doi.org/10.3139/146.110415) | `782b5c5fea66780b52d7ac2ca79279293ceabc7c8c31e02a58ee92f5770e8b4f` | [viewer](https://orchid-project.org/phase-diagrams/#CO-GD/CoGd-10Wan.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoGd-10Wan.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoGd-10Wan.json) |
| CoGd-95Liu-LB.tdb | Z.-K. Liu, W. Zhang, B. Sundman, J. Alloys Compd. 226, 33-45(1995). [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7) | `a56e13c2aace898a74eb36b931f7973dacdd49d8ee8aa256320010b5f71ba25e` | [viewer](https://orchid-project.org/phase-diagrams/#CO-GD/CoGd-95Liu-LB.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/CoGd-95Liu-LB.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/CoGd-95Liu-LB.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| CoGd-10Wan.tdb | 1638.28 | DELTA_PHASE (x(Gd) 0.10973) + LIQUID (x(Gd) 0.13388) + KAP_LIQ (x(Gd) 0.1339) |
| CoGd-10Wan.tdb | 1638.01 | FCC_A1 (x(Gd) 4.300e-4) + KAP_LIQ (x(Gd) 0.08302) + DELTA_PHASE (x(Gd) 0.10692) |
| CoGd-10Wan.tdb | 1623.33 | DELTA_PHASE (x(Gd) 0.11747) + DELTA_PHASE#2 (x(Gd) 0.13893) + LIQUID (x(Gd) 0.16262) |
| CoGd-10Wan.tdb | 1567.83 | DELTA_PHASE (x(Gd) 0.16276) + CO7GD2 (x(Gd) 0.22222) + LIQUID (x(Gd) 0.25032) |
| CoGd-10Wan.tdb | 1567.83 | DELTA_PHASE (x(Gd) 0.16278) + CO7GD2 (x(Gd) 0.22222) + LIQUID (x(Gd) 0.25052) |
| CoGd-10Wan.tdb | 1559.17 | CO7GD2 (x(Gd) 0.22222) + LIQUID (x(Gd) 0.27191) + KAP_LIQ (x(Gd) 0.27227) |
| CoGd-10Wan.tdb | 1550.01 | CO7GD2 (x(Gd) 0.22222) + CO3GD (x(Gd) 0.25) + KAP_LIQ (x(Gd) 0.28755) |
| CoGd-10Wan.tdb | 1550.01 | CO7GD2 (x(Gd) 0.22222) + CO3GD (x(Gd) 0.25) + KAP_LIQ (x(Gd) 0.28717) |
| CoGd-10Wan.tdb | 1508.27 | KAP_LIQ (x(Gd) 0.95958) + HCP_A3 (x(Gd) 0.99976) + BCC_A2 (x(Gd) 0.99978) |
| CoGd-10Wan.tdb | 1479.11 | CO3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.36672) + KAP_LIQ (x(Gd) 0.36725) |
| CoGd-10Wan.tdb | 1479.1 | CO3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.3665) + KAP_LIQ (x(Gd) 0.36703) |
| CoGd-10Wan.tdb | 1388.91 | CO3GD (x(Gd) 0.25) + CO2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.41979) |
| CoGd-10Wan.tdb | 1388.91 | CO3GD (x(Gd) 0.25) + CO2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.41987) |
| CoGd-10Wan.tdb | 1388.91 | CO3GD (x(Gd) 0.25) + CO2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.41962) |
| CoGd-10Wan.tdb | 1132.13 | DELTA_PHASE#2 (x(Gd) 0.106) + DELTA_PHASE (x(Gd) 0.1569) + CO7GD2 (x(Gd) 0.22222) |
| CoGd-10Wan.tdb | 1052.9 | KAP_LIQ (x(Gd) 0.74562) + COGD3_D011 (x(Gd) 0.75) + HCP_A3 (x(Gd) 0.99969) |
| CoGd-10Wan.tdb | 1051.69 | LIQUID (x(Gd) 0.73657) + KAP_LIQ (x(Gd) 0.73721) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-10Wan.tdb | 1051.69 | LIQUID (x(Gd) 0.73671) + KAP_LIQ (x(Gd) 0.73735) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-10Wan.tdb | 960.01 | CO2GD_C15 (x(Gd) 0.33333) + KAP_LIQ (x(Gd) 0.59643) + LIQUID (x(Gd) 0.59693) |
| CoGd-10Wan.tdb | 960.01 | CO2GD_C15 (x(Gd) 0.33333) + KAP_LIQ (x(Gd) 0.59615) + LIQUID (x(Gd) 0.59665) |
| CoGd-10Wan.tdb | 942.86 | CO2GD_C15 (x(Gd) 0.33333) + CO3GD4 (x(Gd) 0.57143) + KAP_LIQ (x(Gd) 0.60096) |
| CoGd-10Wan.tdb | 942.85 | CO2GD_C15 (x(Gd) 0.33333) + CO3GD4 (x(Gd) 0.57143) + KAP_LIQ (x(Gd) 0.60128) |
| CoGd-10Wan.tdb | 942.85 | CO2GD_C15 (x(Gd) 0.33333) + CO3GD4 (x(Gd) 0.57143) + KAP_LIQ (x(Gd) 0.60135) |
| CoGd-10Wan.tdb | 931.7 | KAP_LIQ (x(Gd) 0.63598) + LIQUID (x(Gd) 0.6364) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-10Wan.tdb | 931.69 | KAP_LIQ (x(Gd) 0.63567) + LIQUID (x(Gd) 0.63608) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-10Wan.tdb | 921.72 | CO3GD4 (x(Gd) 0.57143) + KAP_LIQ (x(Gd) 0.63125) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-10Wan.tdb | 921.72 | CO3GD4 (x(Gd) 0.57143) + KAP_LIQ (x(Gd) 0.63139) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-10Wan.tdb | 921.72 | CO3GD4 (x(Gd) 0.57143) + KAP_LIQ (x(Gd) 0.63118) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-10Wan.tdb | 921.72 | CO3GD4 (x(Gd) 0.57143) + KAP_LIQ (x(Gd) 0.63138) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-10Wan.tdb | 694.99 | FCC_A1 (x(Gd) 0) + HCP_A3 (x(Gd) 0) + DELTA_PHASE (x(Gd) 0.10526) |
| CoGd-95Liu-LB.tdb | 1642.32 | FCC_A1 (x(Gd) 1.000e-5) + LIQUID (x(Gd) 0.06669) + CO17GD2 (x(Gd) 0.10526) |
| CoGd-95Liu-LB.tdb | 1642.32 | FCC_A1 (x(Gd) 1.000e-5) + LIQUID (x(Gd) 0.06684) + CO17GD2 (x(Gd) 0.10526) |
| CoGd-95Liu-LB.tdb | 1642.32 | FCC_A1 (x(Gd) 1.000e-5) + LIQUID (x(Gd) 0.06668) + CO17GD2 (x(Gd) 0.10526) |
| CoGd-95Liu-LB.tdb | 1618.2 | CO17GD2 (x(Gd) 0.10526) + CO5GD_D2D (x(Gd) 0.16667) + LIQUID (x(Gd) 0.18036) |
| CoGd-95Liu-LB.tdb | 1618.2 | CO17GD2 (x(Gd) 0.10526) + CO5GD_D2D (x(Gd) 0.16667) + LIQUID (x(Gd) 0.18022) |
| CoGd-95Liu-LB.tdb | 1568.84 | CO5GD_D2D (x(Gd) 0.16667) + CO7GD2 (x(Gd) 0.22222) + LIQUID (x(Gd) 0.25872) |
| CoGd-95Liu-LB.tdb | 1568.83 | CO5GD_D2D (x(Gd) 0.16667) + CO7GD2 (x(Gd) 0.22222) + LIQUID (x(Gd) 0.25917) |
| CoGd-95Liu-LB.tdb | 1568.83 | CO5GD_D2D (x(Gd) 0.16667) + CO7GD2 (x(Gd) 0.22222) + LIQUID (x(Gd) 0.2593) |
| CoGd-95Liu-LB.tdb | 1548.04 | CO7GD2 (x(Gd) 0.22222) + CO3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.29725) |
| CoGd-95Liu-LB.tdb | 1548.04 | CO7GD2 (x(Gd) 0.22222) + CO3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.29705) |
| CoGd-95Liu-LB.tdb | 1548.04 | CO7GD2 (x(Gd) 0.22222) + CO3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.29745) |
| CoGd-95Liu-LB.tdb | 1548.04 | CO7GD2 (x(Gd) 0.22222) + CO3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.29745) |
| CoGd-95Liu-LB.tdb | 1508.16 | LIQUID (x(Gd) 0.96254) + HCP_A3 (x(Gd) 1) + BCC_A2 (x(Gd) 1) |
| CoGd-95Liu-LB.tdb | 1508.16 | LIQUID (x(Gd) 0.9625) + BCC_A2 (x(Gd) 1) + HCP_A3 (x(Gd) 1) |
| CoGd-95Liu-LB.tdb | 1508.16 | LIQUID (x(Gd) 0.96239) + BCC_A2 (x(Gd) 1) + HCP_A3 (x(Gd) 1) |
| CoGd-95Liu-LB.tdb | 1508.16 | LIQUID (x(Gd) 0.96257) + HCP_A3 (x(Gd) 1) + BCC_A2 (x(Gd) 1) |
| CoGd-95Liu-LB.tdb | 1382.83 | CO3GD (x(Gd) 0.25) + CO2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.4467) |
| CoGd-95Liu-LB.tdb | 1382.83 | CO3GD (x(Gd) 0.25) + CO2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.44667) |
| CoGd-95Liu-LB.tdb | 1382.83 | CO3GD (x(Gd) 0.25) + CO2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.44688) |
| CoGd-95Liu-LB.tdb | 1123.03 | CO17GD2 (x(Gd) 0.10526) + CO5GD_D2D (x(Gd) 0.16667) + CO7GD2 (x(Gd) 0.22222) |
| CoGd-95Liu-LB.tdb | 1030.14 | LIQUID (x(Gd) 0.73968) + COGD3_D011 (x(Gd) 0.75) + HCP_A3 (x(Gd) 1) |
| CoGd-95Liu-LB.tdb | 1030.14 | LIQUID (x(Gd) 0.73968) + COGD3_D011 (x(Gd) 0.75) + HCP_A3 (x(Gd) 1) |
| CoGd-95Liu-LB.tdb | 1030.14 | LIQUID (x(Gd) 0.73962) + COGD3_D011 (x(Gd) 0.75) + HCP_A3 (x(Gd) 1) |
| CoGd-95Liu-LB.tdb | 1030.14 | LIQUID (x(Gd) 0.73995) + COGD3_D011 (x(Gd) 0.75) + HCP_A3 (x(Gd) 1) |
| CoGd-95Liu-LB.tdb | 918.98 | CO2GD_C15 (x(Gd) 0.33333) + CO3GD4 (x(Gd) 0.57143) + LIQUID (x(Gd) 0.60981) |
| CoGd-95Liu-LB.tdb | 918.98 | CO2GD_C15 (x(Gd) 0.33333) + CO3GD4 (x(Gd) 0.57143) + LIQUID (x(Gd) 0.60957) |
| CoGd-95Liu-LB.tdb | 918.98 | CO2GD_C15 (x(Gd) 0.33333) + CO3GD4 (x(Gd) 0.57143) + LIQUID (x(Gd) 0.60982) |
| CoGd-95Liu-LB.tdb | 889.76 | CO3GD4 (x(Gd) 0.57143) + LIQUID (x(Gd) 0.6342) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-95Liu-LB.tdb | 889.76 | CO3GD4 (x(Gd) 0.57143) + LIQUID (x(Gd) 0.63416) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-95Liu-LB.tdb | 889.76 | CO3GD4 (x(Gd) 0.57143) + LIQUID (x(Gd) 0.63432) + COGD3_D011 (x(Gd) 0.75) |
| CoGd-95Liu-LB.tdb | 694.99 | FCC_A1 (x(Gd) 0) + HCP_A3 (x(Gd) 0) + CO17GD2 (x(Gd) 0.10526) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/CO/CO-GD.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/CO/CO-GD.json) · [CALPHAD hull CoGd-95Liu-LB](https://data.orchid-project.org/hulls/calphad-sgte/CO/CO-GD--CoGd-95Liu-LB.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Co–Gd system (24)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1643 | eutectic: liq. -> Co17Gd2 + f.c.c. | L: Gd 0.067; Co17Gd2: Gd 0.105263 | model | [1] Liu 1995 | Table 1, p. 3, row 26; `ORC-M6CGWM3TSW` |  |
| 1638 | eutectic: liq. -> Co17Gd2 + f.c.c. | L: Gd 0.075; Co17Gd2: Gd 0.105263 | experimental | [1] Liu 1995; _cites Buschow 1969_ [doi](https://doi.org/10.1016/0022-5088%2869%2990140-4) | Table 1, p. 3, row 27; `ORC-H6FMHJENAK` |  |
| 1628 | liq. + Co17Gd2 -> Co5Gd | Co17Gd2: Gd 0.105263; Co5Gd: Gd 0.166667 | experimental | [1] Liu 1995; _cites Buschow 1969_ [doi](https://doi.org/10.1016/0022-5088%2869%2990140-4) | Table 1, p. 3, row 21; `ORC-3XAUH7REOG` |  |
| 1623 | liq. + Co17Gd2 -> Co5Gd | Co17Gd2: Gd 0.105263; Co5Gd: Gd 0.166667 | experimental | [1] Liu 1995; _cites Ge 1992_ | Table 1, p. 3, row 22; `ORC-OCSQCS53CB` |  |
| 1619 | liq. + Co17Gd2 -> Co5Gd | L: Gd 0.18; Co17Gd2: Gd 0.105263; Co5Gd: Gd 0.166667 | model | [1] Liu 1995 | Table 1, p. 3, row 20; `ORC-4FBFFWD2AG` |  |
| 1614 | eutectic: liq. -> Co17Gd2 + f.c.c. | L: Gd 0.075; Co17Gd2: Gd 0.105263 | experimental | [1] Liu 1995; _cites Ge 1992_ | Table 1, p. 3, row 28; `ORC-ZIGKX7QAH4` |  |
| 1573 | liq. + Co5Gd -> Co7Gd2 | Co5Gd: Gd 0.166667; Co7Gd2: Gd 0.222222 | experimental | [1] Liu 1995; _cites Buschow 1969_ [doi](https://doi.org/10.1016/0022-5088%2869%2990140-4) | Table 1, p. 3, row 18; `ORC-JJLHTBXWSE` |  |
| 1570 | liq. + Co5Gd -> Co7Gd2 | L: Gd 0.259; Co5Gd: Gd 0.166667; Co7Gd2: Gd 0.222222 | model | [1] Liu 1995 | Table 1, p. 3, row 17; `ORC-G6HTQQNUSY` |  |
| 1568 | liq. + Co5Gd -> Co7Gd2 | Co5Gd: Gd 0.166667; Co7Gd2: Gd 0.222222 | experimental | [1] Liu 1995; _cites Ge 1992_ | Table 1, p. 3, row 19; `ORC-56Z2KRIYB4` |  |
| 1550 | liq. + Co7Gd2 -> Co3Gd | Co7Gd2: Gd 0.222222; Co3Gd: Gd 0.25 | experimental | [1] Liu 1995; _cites Ge 1992_ | Table 1, p. 3, row 16; `ORC-TUVIBEGQ22` |  |
| 1549 | liq. + Co7Gd2 -> Co3Gd | L: Gd 0.297; Co7Gd2: Gd 0.222222; Co3Gd: Gd 0.25 | model | [1] Liu 1995 | Table 1, p. 3, row 14; `ORC-GGDQIB4UCS` |  |
| 1548 | liq. + Co7Gd2 -> Co3Gd | Co7Gd2: Gd 0.222222; Co3Gd: Gd 0.25 | experimental | [1] Liu 1995; _cites Buschow 1969_ [doi](https://doi.org/10.1016/0022-5088%2869%2990140-4) | Table 1, p. 3, row 15; `ORC-GJ5YVPYQD6` |  |
| 1389 | liq. + Co3Gd -> Co2Gd | Co3Gd: Gd 0.25; Co2Gd: Gd 0.333333 | experimental | [1] Liu 1995; _cites Ge 1992_ | Table 1, p. 3, row 13; `ORC-6V77TU2BLO` |  |
| 1388 | liq. + Co3Gd -> Co2Gd | L: Gd 0.445; Co3Gd: Gd 0.25; Co2Gd: Gd 0.333333 | model | [1] Liu 1995 | Table 1, p. 3, row 11; `ORC-3GSVGO4SWA` |  |
| 1388 | liq. + Co3Gd -> Co2Gd | Co3Gd: Gd 0.25; Co2Gd: Gd 0.333333 | experimental | [1] Liu 1995; _cites Buschow 1969_ [doi](https://doi.org/10.1016/0022-5088%2869%2990140-4) | Table 1, p. 3, row 12; `ORC-OVXWNSRHD5` |  |
| 1123 | Co5Gd -> Co17Gd2 + Co7Gd2 | Co5Gd: Gd 0.166667; Co17Gd2: Gd 0.105263; Co7Gd2: Gd 0.222222 | experimental | [1] Liu 1995; _cites Ge 1992_ | Table 1, p. 3, row 30; `ORC-D5J6RH4JZ3` |  |
| 1053 | liq. + h.c.p. -> CoGd3 | CoGd3: Gd 0.75 | experimental | [1] Liu 1995; _cites Buschow 1969_ [doi](https://doi.org/10.1016/0022-5088%2869%2990140-4) | Table 1, p. 3, row 3; `ORC-4YTQMD5NHW` |  |
| 1053 | liq. + h.c.p. -> CoGd3 | L: Gd 0.739; CoGd3: Gd 0.75 | model | [1] Liu 1995 | Table 1, p. 3, row 2; `ORC-5TWMSJ5DLA` |  |
| 1053 | liq. + h.c.p. -> CoGd3 | CoGd3: Gd 0.75 | experimental | [1] Liu 1995; _cites Ge 1992_ | Table 1, p. 3, row 4; `ORC-HWVRJ2LLDG` |  |
| 943 | liq. + Co2Gd -> Co3Gd4 | Co2Gd: Gd 0.333333; Co3Gd4: Gd 0.571429 | experimental | [1] Liu 1995; _cites Ge 1992_ | Table 1, p. 3, row 10; `ORC-S5EQLCO5VY` |  |
| 943 | liq. + Co2Gd -> Co3Gd4 | L: Gd 0.609; Co2Gd: Gd 0.333333; Co3Gd4: Gd 0.571429 | model | [1] Liu 1995 | Table 1, p. 3, row 8; `ORC-S65VT663FF` |  |
| 938 | liq. + Co2Gd -> Co3Gd4 | L: Gd 0.635; Co2Gd: Gd 0.333333; Co3Gd4: Gd 0.571429 | experimental | [1] Liu 1995; _cites Buschow 1969_ [doi](https://doi.org/10.1016/0022-5088%2869%2990140-4) | Table 1, p. 3, row 7; `ORC-EHRGOABIWA` |  |
| 918 | eutectic: liq. -> Co3Gd4 + CoGd3 | L: Gd 0.632; Co3Gd4: Gd 0.571429; CoGd3: Gd 0.75 | model | [1] Liu 1995 | Table 1, p. 3, row 5; `ORC-PFRDE2GHJJ` |  |
| 918 | eutectic: liq. -> Co3Gd4 + CoGd3 | L: Gd 0.642; Co3Gd4: Gd 0.571429; CoGd3: Gd 0.75 | experimental | [1] Liu 1995; _cites Ge 1992_ | Table 1, p. 3, row 6; `ORC-QIBAU46SGQ` |  |

## Other properties

### Phase transition (17)

Table: Phase transition, Co–Gd system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 130 K | 130 | magnetic: Burzo \[20\] CoGd3; _alloy: Gd 0.75_ | experimental | [1] Liu 1995; _cites Burzo 1972_ [doi](https://doi.org/10.1103/physrevb.6.2882) | Table 2, p. 4, row 1; `ORC-BTK62TEA6Z` |  |
| Phase transition | 233 K | 233 | magnetic: Burzo \[20\] Co3Gd4; _alloy: Gd 0.571429_ | experimental | [1] Liu 1995; _cites Burzo 1972_ [doi](https://doi.org/10.1103/physrevb.6.2882) | Table 2, p. 4, row 2; `ORC-OGEWYSGSZQ` |  |
| Phase transition | 395 K | 395 | magnetic: Burzo \[20\] Co2Gd; _alloy: Gd 0.333333_ | experimental | [1] Liu 1995; _cites Burzo 1972_ [doi](https://doi.org/10.1103/physrevb.6.2882) | Table 2, p. 4, row 3; `ORC-TQFN6UCMRI` |  |
| Phase transition | 404 K | 404 | magnetic: Lemaire \[21,22\] Co2Gd; _alloy: Gd 0.333333_ | experimental | [1] Liu 1995; _cites Lemalre 1966_ | Table 2, p. 4, row 8; `ORC-JVRAJS5KSR` |  |
| Phase transition | 611 K | 611 | magnetic: Burzo \[20\] Co3Gd; _alloy: Gd 0.25_ | experimental | [1] Liu 1995; _cites Burzo 1972_ [doi](https://doi.org/10.1103/physrevb.6.2882) | Table 2, p. 4, row 4; `ORC-IKKTLCNZ33` |  |
| Phase transition | 612 K | 612 | magnetic: Lemaire \[21,22\] Co3Gd; _alloy: Gd 0.25_ | experimental | [1] Liu 1995; _cites Lemalre 1966_ | Table 2, p. 4, row 9; `ORC-NJKRJEMKM6` |  |
| Phase transition | 695 K | 695 | f.c.c. -> h.c.p. | model | [1] Liu 1995 | Table 1, p. 3, row 31; `ORC-3DBHGFV7GL` |  |
| Phase transition | 767 K | 767 | magnetic: Burzo \[20\] Co7Gd2; _alloy: Gd 0.222222_ | experimental | [1] Liu 1995; _cites Burzo 1972_ [doi](https://doi.org/10.1103/physrevb.6.2882) | Table 2, p. 4, row 5; `ORC-M7KIJXLEVY` |  |
| Phase transition | 775 K | 775 | magnetic: Lemaire \[21,22\] Co7Gd2; _alloy: Gd 0.222222_ | experimental | [1] Liu 1995; _cites Lemalre 1966_ | Table 2, p. 4, row 10; `ORC-DZ5BD56UB7` |  |
| Phase transition | 1008 K | 1008 | magnetic: Lemaire \[21,22\] Co5Gd; _alloy: Gd 0.166667_ | experimental | [1] Liu 1995; _cites Lemalre 1966_ | Table 2, p. 4, row 11; `ORC-LZINVLTO3R` |  |
| Phase transition | 1020 K | 1020 | magnetic: Burzo \[20\] Co5Gd; _alloy: Gd 0.166667_ | experimental | [1] Liu 1995; _cites Burzo 1972_ [doi](https://doi.org/10.1103/physrevb.6.2882) | Table 2, p. 4, row 6; `ORC-Q33X5KP3OE` |  |
| Phase transition | 1209 K | 1209 | magnetic: Lemaire \[21,22\] Co17Gd2; _alloy: Gd 0.105263_ | experimental | [1] Liu 1995; _cites Lemalre 1966_ | Table 2, p. 4, row 12; `ORC-W5G5J4IT37` |  |
| Phase transition | 1222 K | 1222 | magnetic: Burzo \[20\] Co17Gd2; _alloy: Gd 0.105263_ | experimental | [1] Liu 1995; _cites Burzo 1972_ [doi](https://doi.org/10.1103/physrevb.6.2882) | Table 2, p. 4, row 7; `ORC-ULGS3KC7Q5` |  |
| Phase transition | 1262 K | 1262 | b.c.c. -> h.c.p.; _b.c.c.: Gd 0.975; h.c.p.: Gd 0.975_ | model | [1] Liu 1995 | Table 1, p. 3, row 1; `ORC-5ADV2UYSFS` |  |
| Phase transition | 1643 K | 1643 | liq. -> Co17Gd2; _L: Gd 0.105263; Co17Gd2: Gd 0.105263_ | experimental | [1] Liu 1995; _cites Ge 1992_ | Table 1, p. 3, row 25; `ORC-RUDEUEXENM` |  |
| Phase transition | 1658 K | 1658 | liq. -> Co17Gd2; _L: Gd 0.105263; Co17Gd2: Gd 0.105263_ | experimental | [1] Liu 1995; _cites Buschow 1969_ [doi](https://doi.org/10.1016/0022-5088%2869%2990140-4) | Table 1, p. 3, row 24; `ORC-CJ2BD4QEWS` |  |
| Phase transition | 1658 K | 1658 | liq. -> Co17Gd2; _L: Gd 0.105; Co17Gd2: Gd 0.105263_ | model | [1] Liu 1995 | Table 1, p. 3, row 23; `ORC-VZQX6HOSVT` |  |

### Heat capacity / entropy / enthalpy (1)

Table: Heat capacity / entropy / enthalpy, Co–Gd system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Heat capacity; _printed: heat capacity_ | 41 J K - ~ per mole of atoms | 975 |  | experimental | [1] Liu 1995; _cites Baricco 1987_ [doi](https://doi.org/10.1016/0036-9748%2887%2990335-8) | p. 8; `ORC-KH76QFXOHD` | “In the Co-Gd system, the T In(T) term is introduced to fit the heat capacity of the liquid measured by Baricco et al. \[ 19\], which is about 41 J K - ~ per mole of atoms at about 975 K.” |

## Sources

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

1. Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995). [doi:10.1016/0925-8388(95)01578-7](https://doi.org/10.1016/0925-8388%2895%2901578-7)

## 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/).