# Fe–Gd system

> Fe–Gd system: 144 accepted literature values (invariant reaction 68, formation 32, phase transition 31, heat capacity / entropy / enthalpy 13) and 6 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

144 accepted literature values from 3 paper(s) (experimental 91, model 53); 6 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/FE-GD.json) · [CSV](https://data.orchid-project.org/systems/FE-GD.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#FE-GD) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#FE-GD/FeGd-00Zin.json) · [phases (11)](https://data.orchid-project.org/phases/pages/FE-GD.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/FE-GD.html) · [Markdown](https://data.orchid-project.org/systems/FE-GD.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 91 |
| model | 53 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 68 |
| phase transition | 31 |
| formation | 32 |
| heat capacity / entropy / enthalpy | 13 |

## 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 |
|---|---|---|---|
| FeGd-00Zin.tdb | M. Zinkevich, N. Mattern, H.J. Seifert, J. Phase Equilib., 21, 385-94(2000). [doi:10.1361/105497100770339923](https://doi.org/10.1361/105497100770339923) | `c29d3c3fbef2ea498c8f2bc5a446fecf1db4447031f412115fe98c20a6acba00` | [viewer](https://orchid-project.org/phase-diagrams/#FE-GD/FeGd-00Zin.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeGd-00Zin.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeGd-00Zin.json) |
| FeGd-02Zin-newGd.tdb | M. Zinkevich, N. Mattern, H.J. Seifert, E. Gmelin, Scand. J. Metall., 31, 34-51(2002). [doi:10.1034/j.1600-0692.2002.311310106.x](https://doi.org/10.1034/j.1600-0692.2002.311310106.x) | `f16780fed3b16558b12ee6c19617ba96201090f474c350de3b4cfd1702a25370` | [viewer](https://orchid-project.org/phase-diagrams/#FE-GD/FeGd-02Zin-newGd.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeGd-02Zin-newGd.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeGd-02Zin-newGd.json) |
| FeGd-02Zin.tdb | M. Zinkevich, N. Mattern, H.J. Seifert, E. Gmelin, Scand. J. Metall., 31, 34-51(2002). [doi:10.1034/j.1600-0692.2002.311310106.x](https://doi.org/10.1034/j.1600-0692.2002.311310106.x) | `ccf919e5867bc08854e2f8fb2aa49318846e006edf9230a325558f5bb21dd04b` | [viewer](https://orchid-project.org/phase-diagrams/#FE-GD/FeGd-02Zin.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeGd-02Zin.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeGd-02Zin.json) |
| FeGd-12Wan.tdb | W. Wang, C. Guo, C. Li, Z. Du, J. Rare Earths, 30, 1055-63(2012). [doi:10.1016/S1002-0721(12)60178-1](https://doi.org/10.1016/S1002-0721%2812%2960178-1) | `f83f09ebff484a468faeba12436a4e4a1b3fa0e84e71b0ae2851fb73d8262db9` | [viewer](https://orchid-project.org/phase-diagrams/#FE-GD/FeGd-12Wan.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeGd-12Wan.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeGd-12Wan.json) |
| FeGd-17Che.tdb | X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017). [doi:10.1016/j.calphad.2017.07.005](https://doi.org/10.1016/j.calphad.2017.07.005) | `6eae73757a5ee767c2857d2e8d25bb4ba443843a36b84f939d8ebbfb199bc2ad` | [viewer](https://orchid-project.org/phase-diagrams/#FE-GD/FeGd-17Che.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeGd-17Che.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeGd-17Che.json) |
| FeGd-95Liu.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) | `5d743908ff00aa1ff55cd38d2a312c79f61b6c98268648803a8c3d476453a747` | [viewer](https://orchid-project.org/phase-diagrams/#FE-GD/FeGd-95Liu.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeGd-95Liu.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeGd-95Liu.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| FeGd-00Zin.tdb | 1652.62 | FCC_A1 (x(Gd) 0.00593) + BCC_A2 (x(Gd) 0.00647) + LIQUID (x(Gd) 0.09306) |
| FeGd-00Zin.tdb | 1608.09 | FCC_A1 (x(Gd) 0.00716) + FE17GD2_HT (x(Gd) 0.10526) + LIQUID (x(Gd) 0.12396) |
| FeGd-00Zin.tdb | 1608.09 | FCC_A1 (x(Gd) 0.00716) + FE17GD2_HT (x(Gd) 0.10526) + LIQUID (x(Gd) 0.12395) |
| FeGd-00Zin.tdb | 1553.25 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.21482) |
| FeGd-00Zin.tdb | 1553.25 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.21521) |
| FeGd-00Zin.tdb | 1553.25 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.21434) |
| FeGd-00Zin.tdb | 1532.24 | LIQUID (x(Gd) 0.97057) + BCC_A2 (x(Gd) 0.99741) + HCP_A3 (x(Gd) 0.99794) |
| FeGd-00Zin.tdb | 1488.35 | FE17GD2_HT (x(Gd) 0.10526) + FE17GD2_LT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) |
| FeGd-00Zin.tdb | 1488.35 | FCC_A1 (x(Gd) 0.00596) + FE17GD2_LT (x(Gd) 0.10526) + FE17GD2_HT (x(Gd) 0.10526) |
| FeGd-00Zin.tdb | 1488.35 | FCC_A1 (x(Gd) 0.00595) + FE17GD2_HT (x(Gd) 0.10526) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-00Zin.tdb | 1431.51 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47435) |
| FeGd-00Zin.tdb | 1431.51 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47434) |
| FeGd-00Zin.tdb | 1431.51 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47463) |
| FeGd-00Zin.tdb | 1431.51 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47464) |
| FeGd-00Zin.tdb | 1356.64 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.55946) |
| FeGd-00Zin.tdb | 1356.64 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.55956) |
| FeGd-00Zin.tdb | 1204.93 | FCC_A1 (x(Gd) 0.00151) + BCC_A2 (x(Gd) 0.00314) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-00Zin.tdb | 1204.93 | FCC_A1 (x(Gd) 0.0015) + BCC_A2 (x(Gd) 0.00312) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-00Zin.tdb | 1104.16 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.71374) + HCP_A3 (x(Gd) 0.99622) |
| FeGd-00Zin.tdb | 1104.16 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.71365) + HCP_A3 (x(Gd) 0.99622) |
| FeGd-00Zin.tdb | 474.36 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) |
| FeGd-02Zin-newGd.tdb | 1651.54 | FCC_A1 (x(Gd) 0.00595) + BCC_A2 (x(Gd) 0.00654) + LIQUID (x(Gd) 0.09361) |
| FeGd-02Zin-newGd.tdb | 1607.5 | FCC_A1 (x(Gd) 0.00716) + FE17GD2_HT (x(Gd) 0.10526) + LIQUID (x(Gd) 0.12422) |
| FeGd-02Zin-newGd.tdb | 1607.5 | FCC_A1 (x(Gd) 0.00716) + FE17GD2_HT (x(Gd) 0.10526) + LIQUID (x(Gd) 0.12419) |
| FeGd-02Zin-newGd.tdb | 1551.48 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6 (x(Gd) 0.2069) + LIQUID (x(Gd) 0.21558) |
| FeGd-02Zin-newGd.tdb | 1551.48 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6 (x(Gd) 0.2069) + LIQUID (x(Gd) 0.21612) |
| FeGd-02Zin-newGd.tdb | 1551.48 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6 (x(Gd) 0.2069) + LIQUID (x(Gd) 0.21648) |
| FeGd-02Zin-newGd.tdb | 1503.3 | LIQUID (x(Gd) 0.95571) + BCC_A2 (x(Gd) 0.99636) + HCP_A3 (x(Gd) 0.99729) |
| FeGd-02Zin-newGd.tdb | 1488.24 | FE17GD2_HT (x(Gd) 0.10526) + FE17GD2_LT (x(Gd) 0.10526) + FE23GD6 (x(Gd) 0.2069) |
| FeGd-02Zin-newGd.tdb | 1488.24 | FCC_A1 (x(Gd) 0.00596) + FE17GD2_LT (x(Gd) 0.10526) + FE17GD2_HT (x(Gd) 0.10526) |
| FeGd-02Zin-newGd.tdb | 1488.24 | FCC_A1 (x(Gd) 0.00596) + FE17GD2_HT (x(Gd) 0.10526) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-02Zin-newGd.tdb | 1428.77 | FE23GD6 (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47426) |
| FeGd-02Zin-newGd.tdb | 1428.77 | FE23GD6 (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47414) |
| FeGd-02Zin-newGd.tdb | 1428.77 | FE23GD6 (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47454) |
| FeGd-02Zin-newGd.tdb | 1428.77 | FE23GD6 (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47455) |
| FeGd-02Zin-newGd.tdb | 1346.36 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.56431) |
| FeGd-02Zin-newGd.tdb | 1346.36 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.56406) |
| FeGd-02Zin-newGd.tdb | 1346.36 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.56438) |
| FeGd-02Zin-newGd.tdb | 1205.51 | FCC_A1 (x(Gd) 0.00151) + BCC_A2 (x(Gd) 0.00317) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-02Zin-newGd.tdb | 1205.5 | FCC_A1 (x(Gd) 0.00152) + BCC_A2 (x(Gd) 0.00318) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-02Zin-newGd.tdb | 1087.34 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.72565) + HCP_A3 (x(Gd) 0.99682) |
| FeGd-02Zin-newGd.tdb | 1087.34 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.72555) + HCP_A3 (x(Gd) 0.99682) |
| FeGd-02Zin.tdb | 1652.52 | FCC_A1 (x(Gd) 0.00595) + BCC_A2 (x(Gd) 0.0065) + LIQUID (x(Gd) 0.09297) |
| FeGd-02Zin.tdb | 1608.6 | FCC_A1 (x(Gd) 0.00717) + FE17GD2_HT (x(Gd) 0.10526) + LIQUID (x(Gd) 0.12347) |
| FeGd-02Zin.tdb | 1608.6 | FCC_A1 (x(Gd) 0.00717) + FE17GD2_HT (x(Gd) 0.10526) + LIQUID (x(Gd) 0.12344) |
| FeGd-02Zin.tdb | 1553 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.21474) |
| FeGd-02Zin.tdb | 1552.99 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.21541) |
| FeGd-02Zin.tdb | 1552.99 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.21577) |
| FeGd-02Zin.tdb | 1532.23 | LIQUID (x(Gd) 0.97057) + BCC_A2 (x(Gd) 0.99741) + HCP_A3 (x(Gd) 0.99794) |
| FeGd-02Zin.tdb | 1488.24 | FE17GD2_HT (x(Gd) 0.10526) + FE17GD2_LT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) |
| FeGd-02Zin.tdb | 1488.24 | FCC_A1 (x(Gd) 0.00596) + FE17GD2_LT (x(Gd) 0.10526) + FE17GD2_HT (x(Gd) 0.10526) |
| FeGd-02Zin.tdb | 1488.24 | FCC_A1 (x(Gd) 0.00596) + FE17GD2_HT (x(Gd) 0.10526) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-02Zin.tdb | 1433.33 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47093) |
| FeGd-02Zin.tdb | 1433.33 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47081) |
| FeGd-02Zin.tdb | 1433.33 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47132) |
| FeGd-02Zin.tdb | 1433.33 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47094) |
| FeGd-02Zin.tdb | 1350.98 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.56267) |
| FeGd-02Zin.tdb | 1350.98 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.56231) |
| FeGd-02Zin.tdb | 1350.98 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.56275) |
| FeGd-02Zin.tdb | 1205 | FCC_A1 (x(Gd) 0.00151) + BCC_A2 (x(Gd) 0.00314) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-02Zin.tdb | 1205 | FCC_A1 (x(Gd) 0.0015) + BCC_A2 (x(Gd) 0.00313) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-02Zin.tdb | 1104.33 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.72212) + HCP_A3 (x(Gd) 0.99648) |
| FeGd-02Zin.tdb | 1104.33 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.72203) + HCP_A3 (x(Gd) 0.99648) |
| FeGd-12Wan.tdb | 1653 | FCC_A1 (x(Gd) 0.0081) + BCC_A2 (x(Gd) 0.00836) + LIQUID (x(Gd) 0.0919) |
| FeGd-12Wan.tdb | 1603.93 | FCC_A1 (x(Gd) 0.00999) + FE17GD2 (x(Gd) 0.10526) + LIQUID (x(Gd) 0.12295) |
| FeGd-12Wan.tdb | 1603.93 | FCC_A1 (x(Gd) 0.00998) + FE17GD2 (x(Gd) 0.10526) + LIQUID (x(Gd) 0.12282) |
| FeGd-12Wan.tdb | 1556.03 | FE17GD2 (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.23748) |
| FeGd-12Wan.tdb | 1556.03 | FE17GD2 (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.23778) |
| FeGd-12Wan.tdb | 1556.03 | FE17GD2 (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.23721) |
| FeGd-12Wan.tdb | 1508 | LIQUID (x(Gd) 0.96313) + BCC_A2 (x(Gd) 0.99997) + HCP_A3 (x(Gd) 1) |
| FeGd-12Wan.tdb | 1470.3 | FE23GD6_D8A (x(Gd) 0.2069) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.43305) |
| FeGd-12Wan.tdb | 1470.3 | FE23GD6_D8A (x(Gd) 0.2069) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.43406) |
| FeGd-12Wan.tdb | 1470.3 | FE23GD6_D8A (x(Gd) 0.2069) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.43407) |
| FeGd-12Wan.tdb | 1470.29 | FE23GD6_D8A (x(Gd) 0.2069) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.43368) |
| FeGd-12Wan.tdb | 1288.38 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) |
| FeGd-12Wan.tdb | 1201.16 | FCC_A1 (x(Gd) 3.000e-4) + BCC_A2 (x(Gd) 0.0016) + FE17GD2 (x(Gd) 0.10526) |
| FeGd-12Wan.tdb | 1201.16 | FCC_A1 (x(Gd) 3.000e-4) + BCC_A2 (x(Gd) 0.00159) + FE17GD2 (x(Gd) 0.10526) |
| FeGd-12Wan.tdb | 1117.06 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.7439) + HCP_A3 (x(Gd) 1) |
| FeGd-12Wan.tdb | 1117.06 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.74391) + HCP_A3 (x(Gd) 1) |
| FeGd-12Wan.tdb | 1117.06 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.74403) + HCP_A3 (x(Gd) 1) |
| FeGd-17Che.tdb | 1656.5 | FCC_A1 (x(Gd) 0.00914) + BCC_A2 (x(Gd) 0.00958) + LIQUID (x(Gd) 0.09723) |
| FeGd-17Che.tdb | 1603.92 | FCC_A1 (x(Gd) 0.01105) + FE17GD2_HT (x(Gd) 0.10526) + LIQUID (x(Gd) 0.13355) |
| FeGd-17Che.tdb | 1603.92 | FCC_A1 (x(Gd) 0.01105) + FE17GD2_HT (x(Gd) 0.10526) + LIQUID (x(Gd) 0.1335) |
| FeGd-17Che.tdb | 1556.2 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.24434) |
| FeGd-17Che.tdb | 1556.2 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.24436) |
| FeGd-17Che.tdb | 1556.2 | FE17GD2_HT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.24475) |
| FeGd-17Che.tdb | 1534.14 | LIQUID (x(Gd) 0.97452) + BCC_A2 (x(Gd) 0.99881) + HCP_A3 (x(Gd) 0.99898) |
| FeGd-17Che.tdb | 1482.48 | FE17GD2_HT (x(Gd) 0.10526) + FE17GD2_LT (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) |
| FeGd-17Che.tdb | 1482.48 | FCC_A1 (x(Gd) 0.00467) + FE17GD2_LT (x(Gd) 0.10526) + FE17GD2_HT (x(Gd) 0.10526) |
| FeGd-17Che.tdb | 1482.48 | FCC_A1 (x(Gd) 0.00466) + FE17GD2_HT (x(Gd) 0.10526) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-17Che.tdb | 1427.6 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.4721) |
| FeGd-17Che.tdb | 1427.6 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47203) |
| FeGd-17Che.tdb | 1427.6 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.47242) |
| FeGd-17Che.tdb | 1354.47 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.54581) |
| FeGd-17Che.tdb | 1354.47 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.54563) |
| FeGd-17Che.tdb | 1354.47 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.54587) |
| FeGd-17Che.tdb | 1184.15 | BCC_A2 (x(Gd) 2.600e-4) + FCC_A1 (x(Gd) 3.200e-4) + FE17GD2_LT (x(Gd) 0.10526) |
| FeGd-17Che.tdb | 1105.04 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.72023) + HCP_A3 (x(Gd) 0.99025) |
| FeGd-95Liu.tdb | 1653.99 | FCC_A1 (x(Gd) 0.00762) + BCC_A2 (x(Gd) 0.00814) + LIQUID (x(Gd) 0.08981) |
| FeGd-95Liu.tdb | 1603.94 | FCC_A1 (x(Gd) 0.00944) + FE17GD2 (x(Gd) 0.10526) + LIQUID (x(Gd) 0.12088) |
| FeGd-95Liu.tdb | 1603.94 | FCC_A1 (x(Gd) 0.00944) + FE17GD2 (x(Gd) 0.10526) + LIQUID (x(Gd) 0.12078) |
| FeGd-95Liu.tdb | 1551.63 | FE17GD2 (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.2418) |
| FeGd-95Liu.tdb | 1551.63 | FE17GD2 (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.24161) |
| FeGd-95Liu.tdb | 1551.63 | FE17GD2 (x(Gd) 0.10526) + FE23GD6_D8A (x(Gd) 0.2069) + LIQUID (x(Gd) 0.24188) |
| FeGd-95Liu.tdb | 1512.97 | LIQUID (x(Gd) 0.96058) + BCC_A2 (x(Gd) 0.99575) + HCP_A3 (x(Gd) 0.99999) |
| FeGd-95Liu.tdb | 1512.97 | LIQUID (x(Gd) 0.96056) + BCC_A2 (x(Gd) 0.99575) + HCP_A3 (x(Gd) 0.99999) |
| FeGd-95Liu.tdb | 1427.41 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.48125) |
| FeGd-95Liu.tdb | 1427.41 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.48083) |
| FeGd-95Liu.tdb | 1427.41 | FE23GD6_D8A (x(Gd) 0.2069) + FE3GD (x(Gd) 0.25) + LIQUID (x(Gd) 0.48136) |
| FeGd-95Liu.tdb | 1351.7 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.56599) |
| FeGd-95Liu.tdb | 1351.7 | FE3GD (x(Gd) 0.25) + FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.56626) |
| FeGd-95Liu.tdb | 1197.71 | FCC_A1 (x(Gd) 2.700e-4) + BCC_A2 (x(Gd) 0.00133) + FE17GD2 (x(Gd) 0.10526) |
| FeGd-95Liu.tdb | 1197.71 | FCC_A1 (x(Gd) 2.700e-4) + BCC_A2 (x(Gd) 0.00133) + FE17GD2 (x(Gd) 0.10526) |
| FeGd-95Liu.tdb | 1106.78 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.73529) + HCP_A3 (x(Gd) 1) |
| FeGd-95Liu.tdb | 1106.78 | FE2GD_C15 (x(Gd) 0.33333) + LIQUID (x(Gd) 0.73516) + HCP_A3 (x(Gd) 1) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/FE/FE-GD.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/FE/FE-GD.json) · [CALPHAD hull FeGd-00Zin](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-GD--FeGd-00Zin.json) · [CALPHAD hull FeGd-02Zin-newGd](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-GD--FeGd-02Zin-newGd.json) · [CALPHAD hull FeGd-02Zin](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-GD--FeGd-02Zin.json) · [CALPHAD hull FeGd-12Wan](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-GD--FeGd-12Wan.json) · [CALPHAD hull FeGd-95Liu](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-GD--FeGd-95Liu.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Fe–Gd system (68)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1661 | b.c.c. -> f.c.c. + liq. |  | experimental | [1] Liu 1995; _cites Copeland 1962_ | Table 3, p. 4, row 3; `ORC-OIWCPIV34F` |  |
| 1653 | metatectic/catatectic: δFe \<=> liquid + γFe | δFe: Gd 0.0064; liquid: Gd 0.093; γFe: Gd 0.0059 | model | [2] Zinkevich 2002 | Table 2, p. 3, row 4; `ORC-46UPYCHQHI` |  |
| 1653 | b.c.c. -> f.c.c. + liq. |  | experimental | [1] Liu 1995; _cites ref. 27_ | Table 3, p. 4, row 2; `ORC-5NKD7GOR2K` |  |
| 1653 | metatectic/catatectic: δFe \<=> liquid + γFe | liquid: Gd 0.09 | model | [2] Zinkevich 2002; _cites Liu 1995_ [doi](https://doi.org/10.1016/0925-8388%2895%2901578-7) | Table 2, p. 3, row 3; `ORC-AG3YS4UTGA` |  |
| 1653 | metatectic/catatectic: δFe \<=> liquid + γFe | δFe: Gd 0.008; liquid: Gd 0.15; γFe: Gd 0.006 | experimental | [2] Zinkevich 2002; _cites Savitskii 1969_ | Table 2, p. 3, row 2; `ORC-JGLVLDM2IS` |  |
| 1653 | b.c.c. -> f.c.c. + liq. | L: Gd 0.09 | model | [1] Liu 1995 | Table 3, p. 4, row 1; `ORC-UL3UDTNZVR` |  |
| 1653 | δFe \<-> Liquid + γFe | δFe: Gd 0.008; Liquid: Gd 0.15; γFe: Gd 0.006 | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 2; `ORC-ZV2TJ56EGT` |  |
| 1646 | δFe \<-> Liquid + γFe | δFe: Gd 0.016; Liquid: Gd 0.16; γFe: Gd 0.005 | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 1; `ORC-2GBRQNVATP` |  |
| 1646 | metatectic/catatectic: δFe \<=> liquid + γFe | δFe: Gd 0.016; liquid: Gd 0.16; γFe: Gd 0.005 | experimental | [2] Zinkevich 2002; _cites Savitskii 1961_ | Table 2, p. 3, row 1; `ORC-YJMZ33XVMQ` |  |
| 1608 | peritectic: liquid + γFe \<=> Fe17Gd2(H) | liquid: Gd 0.124; γFe: Gd 0.0072; Fe17Gd2(H): Gd 0.105263 | model | [2] Zinkevich 2002 | Table 2, p. 3, row 11; `ORC-BV2FE3GSHG` |  |
| 1608 | liq. + f.c.c. -> Fe17Gd2 | Fe17Gd2: Gd 0.105263 | experimental | [1] Liu 1995; _cites ref. 27_ | Table 3, p. 4, row 5; `ORC-G3XEPO6R65` |  |
| 1608 | peritectic: liquid + γFe \<=> Fe17Gd2(H) | liquid: Gd 0.19; γFe: Gd 0.009; Fe17Gd2(H): Gd 0.105263 | experimental | [2] Zinkevich 2002; _cites Savitskii 1961_ | Table 2, p. 3, row 8; `ORC-HJKFVEIDZJ` |  |
| 1608 | Liquid + γFe \<-> Fe17Gd2 | Liquid: Gd 0.17; γFe: Gd 0.006; Fe17Gd2: Gd 0.105 | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 5; `ORC-J4SRPLDLS5` |  |
| 1608 | peritectic: liquid + γFe \<=> Fe17Gd2(H) | liquid: Gd 0.17; γFe: Gd 0.006; Fe17Gd2(H): Gd 0.105263 | experimental | [2] Zinkevich 2002; _cites Savitskii 1969_ | Table 2, p. 3, row 9; `ORC-OAPBARZGIC` |  |
| 1608 | Liquid + γFe \<-> Fe17Gd2 | Liquid: Gd 0.19; γFe: Gd 0.009; Fe17Gd2: Gd 0.105 | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 4; `ORC-VZBFZFPXN7` |  |
| 1604 | liq. + f.c.c. -> Fe17Gd2 | L: Gd 0.119; Fe17Gd2: Gd 0.105263 | model | [1] Liu 1995 | Table 3, p. 4, row 4; `ORC-J6MP2YTXG4` |  |
| 1604 | peritectic: liquid + γFe \<=> Fe17Gd2(H) | liquid: Gd 0.119; Fe17Gd2(H): Gd 0.105263 | model | [2] Zinkevich 2002; _cites Liu 1995_ [doi](https://doi.org/10.1016/0925-8388%2895%2901578-7) | Table 2, p. 3, row 10; `ORC-TGNQMVMBGH` |  |
| 1593 | liq. + f.c.c. -> Fe17Gd2 | Fe17Gd2: Gd 0.105263 | experimental | [1] Liu 1995; _cites Copeland 1962_ | Table 3, p. 4, row 6; `ORC-ZCPUUBDH2P` |  |
| 1587 | liq. + f.c.c. -> Fe17Gd2 | Fe17Gd2: Gd 0.105263 | experimental | [1] Liu 1995; _cites Spedding 1961_ | Table 3, p. 4, row 7; `ORC-2FLNJRIT6Y` |  |
| 1556 | liq. + Fe17Gd2 -> Fe23Gd6 | L: Gd 0.234; Fe17Gd2: Gd 0.105263; Fe23Gd6: Gd 0.206897 | model | [1] Liu 1995 | Table 3, p. 4, row 8; `ORC-6C6VXAAX7W` |  |
| 1556 | peritectic: liquid + Fe17Gd2(H) \<=> Fe23Gd6 | liquid: Gd 0.234; Fe17Gd2(H): Gd 0.105263; Fe23Gd6: Gd 0.206897 | model | [2] Zinkevich 2002; _cites Liu 1995_ [doi](https://doi.org/10.1016/0925-8388%2895%2901578-7) | Table 2, p. 3, row 13; `ORC-Z62LGDPMM5` |  |
| 1553 | Liquid + Fe17Gd2 \<-> Fe23Gd6 | Liquid: Gd 0.27; Fe17Gd2: Gd 0.105; Fe23Gd6: Gd 0.207 | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 6; `ORC-ATP2EQVIKT` |  |
| 1553 | peritectic: liquid + Fe17Gd2(H) \<=> Fe23Gd6 | liquid: Gd 0.27; Fe17Gd2(H): Gd 0.105263; Fe23Gd6: Gd 0.206897 | experimental | [2] Zinkevich 2002; _cites Savitskii 1969_ | Table 2, p. 3, row 12; `ORC-OYHGWF55XA` |  |
| 1553 | liq. + Fe17Gd2 -> Fe23Gd6 | Fe17Gd2: Gd 0.105263; Fe23Gd6: Gd 0.206897 | experimental | [1] Liu 1995; _cites ref. 27_ | Table 3, p. 4, row 9; `ORC-WVA46OYFVS` |  |
| 1552 | peritectic: liquid + Fe17Gd2(H) \<=> Fe23Gd6 | liquid: Gd 0.216; Fe17Gd2(H): Gd 0.105263; Fe23Gd6: Gd 0.206897 | model | [2] Zinkevich 2002 | Table 2, p. 3, row 14; `ORC-PUERSQFVH5` |  |
| 1532 | metatectic/catatectic: βGd \<=> liquid + αGd | βGd: Gd 0.995; liquid: Gd 0.95; αGd: Gd 0.995 | experimental | [2] Zinkevich 2002; _cites Savitskii 1969_ | Table 2, p. 3, row 28; `ORC-4CH5CCYWDF` |  |
| 1532 | βGd \<-> Liquid + αGd | βGd: Gd 0.995; Liquid: Gd 0.95; αGd: Gd 0.995 | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 14; `ORC-IDBGAIABJV` |  |
| 1512 | b.c.c. -> h.c.p. + liq. | b.c.c.: Gd 0.9956; L: Gd 0.96 | model | [1] Liu 1995 | Table 3, p. 4, row 21; `ORC-2DX5UZW32C` |  |
| 1512 | metatectic/catatectic: βGd \<=> liquid + αGd | βGd: Gd 0.9956; liquid: Gd 0.96 | model | [2] Zinkevich 2002; _cites Liu 1995_ [doi](https://doi.org/10.1016/0925-8388%2895%2901578-7) | Table 2, p. 3, row 29; `ORC-OGR3XCO2B3` |  |
| 1505 | metatectic/catatectic: βGd \<=> liquid + αGd | βGd: Gd 0.9994; liquid: Gd 0.96; αGd: Gd 0.9999 | model | [2] Zinkevich 2002 | Table 2, p. 3, row 30; `ORC-CDGKISQFML` |  |
| 1446 | liq. + Fe23Gd6 -> Fe3Gd | Fe23Gd6: Gd 0.206897; Fe3Gd: Gd 0.25 | experimental | [1] Liu 1995; _cites Spedding 1961_ | Table 3, p. 4, row 13; `ORC-PZR5Q3IXGA` |  |
| 1433 | Liquid + Fe23Gd6 \<-> Fe3Gd | Liquid: Gd 0.47; Fe23Gd6: Gd 0.207; Fe3Gd: Gd 0.25 | experimental | [3] Zinkevich 2000; _cites Novy 1961_ | Table 1, p. 2, row 8; `ORC-4AKVTHMPU2` |  |
| 1433 | peritectic: liquid + Fe23Gd6 \<=> Fe3Gd | liquid: Gd 0.472; Fe23Gd6: Gd 0.206897; Fe3Gd: Gd 0.25 | model | [2] Zinkevich 2002 | Table 2, p. 3, row 18; `ORC-IPGP4AXE7J` |  |
| 1433 | liq. + Fe23Gd6 -> Fe3Gd | Fe23Gd6: Gd 0.206897; Fe3Gd: Gd 0.25 | experimental | [1] Liu 1995; _cites ref. 27_ | Table 3, p. 4, row 11; `ORC-MMGA2TAVT3` |  |
| 1433 | Liquid + Fe23Gd6 \<-> Fe3Gd | Liquid: Gd 0.41; Fe23Gd6: Gd 0.207; Fe3Gd: Gd 0.25 | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 7; `ORC-PPOXVS2WVU` |  |
| 1433 | peritectic: liquid + Fe23Gd6 \<=> Fe3Gd | liquid: Gd 0.47; Fe23Gd6: Gd 0.206897; Fe3Gd: Gd 0.25 | experimental | [2] Zinkevich 2002; _cites Novy 1961_ | Table 2, p. 3, row 16; `ORC-UHABHJQCJD` |  |
| 1433 | peritectic: liquid + Fe23Gd6 \<=> Fe3Gd | liquid: Gd 0.41; Fe23Gd6: Gd 0.206897; Fe3Gd: Gd 0.25 | experimental | [2] Zinkevich 2002; _cites Savitskii 1969_ | Table 2, p. 3, row 15; `ORC-XXIDQLZOEU` |  |
| 1429 | liq. + Fe23Gd6 -> Fe3Gd | L: Gd 0.477; Fe23Gd6: Gd 0.206897; Fe3Gd: Gd 0.25 | model | [1] Liu 1995 | Table 3, p. 4, row 10; `ORC-BWR3KBOFJ7` |  |
| 1429 | peritectic: liquid + Fe23Gd6 \<=> Fe3Gd | liquid: Gd 0.477; Fe23Gd6: Gd 0.206897; Fe3Gd: Gd 0.25 | model | [2] Zinkevich 2002; _cites Liu 1995_ [doi](https://doi.org/10.1016/0925-8388%2895%2901578-7) | Table 2, p. 3, row 17; `ORC-MXY57LQBVL` |  |
| 1423 | liq. + Fe23Gd6 -> Fe3Gd | Fe23Gd6: Gd 0.206897; Fe3Gd: Gd 0.25 | experimental | [1] Liu 1995; _cites Copeland 1962_ | Table 3, p. 4, row 12; `ORC-SOLNOOVAXU` |  |
| 1355 | liq. + Fe3Gd -> Fe2Gd | L: Gd 0.56; Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333333 | model | [1] Liu 1995 | Table 3, p. 4, row 14; `ORC-KLQ6A2FYBH` |  |
| 1355 | peritectic: liquid + Fe3Gd \<=> Fe2Gd | liquid: Gd 0.56; Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333333 | model | [2] Zinkevich 2002; _cites Liu 1995_ [doi](https://doi.org/10.1016/0925-8388%2895%2901578-7) | Table 2, p. 3, row 22; `ORC-N5IEXQZJ6D` |  |
| 1353 | peritectic: liquid + Fe3Gd \<=> Fe2Gd | liquid: Gd 0.564; Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333333 | model | [2] Zinkevich 2002 | Table 2, p. 3, row 23; `ORC-DOOJCKC72M` |  |
| 1353 | liq. + Fe3Gd -> Fe2Gd | Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333333 | experimental | [1] Liu 1995; _cites Copeland 1962_ | Table 3, p. 4, row 16; `ORC-FHVANPAEEE` |  |
| 1353 | peritectic: liquid + Fe3Gd \<=> Fe2Gd | liquid: Gd 0.56; Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333333 | experimental | [2] Zinkevich 2002; _cites Savitskii 1961_ | Table 2, p. 3, row 19; `ORC-GNBY3V4I22` |  |
| 1353 | liq. + Fe3Gd -> Fe2Gd | Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333333 | experimental | [1] Liu 1995; _cites ref. 27_ | Table 3, p. 4, row 15; `ORC-RF6WXNTRRI` |  |
| 1353 | Liquid + Fe3Gd \<-> Fe2Gd | Liquid: Gd 0.56; Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333 | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 9; `ORC-U2W7UVUO5T` |  |
| 1353 | peritectic: liquid + Fe3Gd \<=> Fe2Gd | liquid: Gd 0.58; Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333333 | experimental | [2] Zinkevich 2002; _cites Savitskii 1969_ | Table 2, p. 3, row 20; `ORC-UR3YYGCYS2` |  |
| 1353 | Liquid + Fe3Gd \<-> Fe2Gd | Liquid: Gd 0.58; Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333 | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 10; `ORC-XYOH37JWVE` |  |
| 1334 | liq. + Fe3Gd -> Fe2Gd | Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333333 | experimental | [1] Liu 1995; _cites Spedding 1961_ | Table 3, p. 4, row 17; `ORC-2DYA36L3WA` |  |
| 1323 | peritectic: liquid + Fe3Gd \<=> Fe2Gd | liquid: Gd 0.55; Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333333 | experimental | [2] Zinkevich 2002; _cites Novy 1961_ | Table 2, p. 3, row 21; `ORC-3HQDBHK7TR` |  |
| 1323 | Liquid + Fe3Gd \<-> Fe2Gd | Liquid: Gd 0.55; Fe3Gd: Gd 0.25; Fe2Gd: Gd 0.333 | experimental | [3] Zinkevich 2000; _cites Novy 1961_ | Table 1, p. 2, row 11; `ORC-KJNGML5FLQ` |  |
| 1205 | f.c.c. + Fe17Gd2 -> b.c.c. | Fe17Gd2: Gd 0.105263 | experimental | [1] Liu 1995; _cites ref. 27_ | Table 3, p. 4, row 23; `ORC-BAMC25RYI5` |  |
| 1205 | peritectoid: γFe + Fe17Gd2(R) \<=> αFe | γFe: Gd 0.005; Fe17Gd2(R): Gd 0.105263; αFe: Gd 0.007 | experimental | [2] Zinkevich 2002; _cites Savitskii 1961_ | Table 2, p. 3, row 5; `ORC-H4WQALVEWJ` |  |
| 1205 | peritectoid: γFe + Fe17Gd2(R) \<=> αFe | γFe: Gd 0.0015; Fe17Gd2(R): Gd 0.105263; αFe: Gd 0.0031 | model | [2] Zinkevich 2002 | Table 2, p. 3, row 7; `ORC-IIMXQCXB4A` |  |
| 1205 | γFe + Fe17Gd2 \<-> αFe | γFe: Gd 0.005; Fe17Gd2: Gd 0.105; αFe: Gd 0.007 | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 3; `ORC-KN44HMFDQV` |  |
| 1197 | peritectoid: γFe + Fe17Gd2(R) \<=> αFe | γFe: Gd 0.002; Fe17Gd2(R): Gd 0.105263; αFe: Gd 2.760e-4 | model | [2] Zinkevich 2002; _cites Liu 1995_ [doi](https://doi.org/10.1016/0925-8388%2895%2901578-7) | Table 2, p. 3, row 6; `ORC-MKHDDOEJQS` |  |
| 1197 | f.c.c. + Fe17Gd2 -> b.c.c. | f.c.c.: Gd 0.001283; Fe17Gd2: Gd 0.105263; b.c.c.: Gd 2.760e-4 | model | [1] Liu 1995 | Table 3, p. 4, row 22; `ORC-PXS6AYUHGL` |  |
| 1183 | f.c.c. + Fe17Gd2 -> b.c.c. | Fe17Gd2: Gd 0.105263 | experimental | [1] Liu 1995; _cites Copeland 1962_ | Table 3, p. 4, row 24; `ORC-3KCNYVYPYE` |  |
| 1133 | eutectic: liquid \<=> Fe2Gd + αGd | liquid: Gd 0.7; Fe2Gd: Gd 0.333333 | experimental | [2] Zinkevich 2002; _cites Novy 1961_ | Table 2, p. 3, row 25; `ORC-O36MJAGJPH` |  |
| 1133 | Liquid \<-> Fe2Gd + αGd | Liquid: Gd 0.7; Fe2Gd: Gd 0.333; αGd: Gd 1 | experimental | [3] Zinkevich 2000; _cites Novy 1961_ | Table 1, p. 2, row 13; `ORC-VPHYHCSCIU` |  |
| 1118 | eutectic: liq. -> Fe2Gd + h.c.p. | Fe2Gd: Gd 0.333333 | experimental | [1] Liu 1995; _cites Copeland 1962_ | Table 3, p. 4, row 20; `ORC-3QGRPWDIJP` |  |
| 1105 | eutectic: liquid \<=> Fe2Gd + αGd | liquid: Gd 0.736; Fe2Gd: Gd 0.333333 | model | [2] Zinkevich 2002; _cites Liu 1995_ [doi](https://doi.org/10.1016/0925-8388%2895%2901578-7) | Table 2, p. 3, row 26; `ORC-7FRZO6DNUS` |  |
| 1105 | eutectic: liq. -> Fe2Gd + h.c.p. | L: Gd 0.736; Fe2Gd: Gd 0.333333 | model | [1] Liu 1995 | Table 3, p. 4, row 18; `ORC-K5A4XJSJP4` |  |
| 1103 | eutectic: liq. -> Fe2Gd + h.c.p. | Fe2Gd: Gd 0.333333 | experimental | [1] Liu 1995; _cites ref. 27_ | Table 3, p. 4, row 19; `ORC-3EDFCRWVDP` |  |
| 1103 | Liquid \<-> Fe2Gd + αGd | Liquid: Gd 0.72; Fe2Gd: Gd 0.333; αGd: Gd 0.999 | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 12; `ORC-EGMZAMBAJR` |  |
| 1103 | eutectic: liquid \<=> Fe2Gd + αGd | liquid: Gd 0.726; Fe2Gd: Gd 0.333333; αGd: Gd 1 | model | [2] Zinkevich 2002 | Table 2, p. 3, row 27; `ORC-SG6KBKU62G` |  |
| 1103 | eutectic: liquid \<=> Fe2Gd + αGd | liquid: Gd 0.72; Fe2Gd: Gd 0.333333; αGd: Gd 0.999 | experimental | [2] Zinkevich 2002; _cites Savitskii 1961_ | Table 2, p. 3, row 24; `ORC-SGSQ35HACA` |  |

## 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, Fe–Gd system (32)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Fe17Gd2 | [Fe17Gd2](https://data.orchid-project.org/compounds/Fe17Gd2.html) | -2.3 kJ/mol-atom ± 1.6 | 298.15 | experimental | -0.552 (mp-aaacqckz) | -0.034 (oqmd-89232) | [3] Zinkevich 2000; _cites Colinet 1987_ [doi](https://doi.org/10.1007/bf02646931) | Table 2, p. 3, row 4; `ORC-L4LH5UJX5O` |  |
| Fe17Gd2(R) |  | -4.34 per mol-atom | 298.15 | model |  |  | [2] Zinkevich 2002 | Table 12, p. 13, row 3; `ORC-ST7FDFMX44.193b7b` |  |
| Fe17Gd2(R) | [Fe17Gd2](https://data.orchid-project.org/compounds/Fe17Gd2.html) | -4.34 kJ/mol-atom | 298.15 | model | -0.552 (mp-aaacqckz) | -0.034 (oqmd-89232) | [2] Zinkevich 2002 | Table 12, p. 13, row 3; `ORC-ST7FDFMX44.9b8b16` |  |
| Fe17Gd2(R) |  | -3.65 per mol-atom | 298.15 | model |  |  | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 2; `ORC-BWDWD4QDIT.1e01c7` |  |
| Fe17Gd2(R) | [Fe17Gd2](https://data.orchid-project.org/compounds/Fe17Gd2.html) | -3.65 kJ/mol-atom | 298.15 | model | -0.552 (mp-aaacqckz) | -0.034 (oqmd-89232) | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 2; `ORC-BWDWD4QDIT.89c066` |  |
| Fe17Gd2(R) |  | -2.3 per mol-atom ± 1.6 | 298.15 | experimental |  |  | [2] Zinkevich 2002; _cites Colinet 1987_ | Table 12, p. 13, row 1; `ORC-GULMEPWYY2.12959b` |  |
| Fe17Gd2(R) | [Fe17Gd2](https://data.orchid-project.org/compounds/Fe17Gd2.html) | -2.3 kJ/mol-atom ± 1.6 | 298.15 | experimental | -0.552 (mp-aaacqckz) | -0.034 (oqmd-89232) | [2] Zinkevich 2002; _cites Colinet 1987_ | Table 12, p. 13, row 1; `ORC-GULMEPWYY2.b2cb0e` |  |
| Fe23Gd6 |  | -6.44 per mol-atom | 298.15 | model |  |  | [2] Zinkevich 2002 | Table 12, p. 13, row 5; `ORC-GFLCDMFT2S.afccbd` |  |
| Fe23Gd6 | [Fe23Gd6](https://data.orchid-project.org/compounds/Fe23Gd6.html) | -6.44 kJ/mol-atom | 298.15 | model | 119.903 (mp-aaacpzco) | -1.306 (oqmd-30181) | [2] Zinkevich 2002 | Table 12, p. 13, row 5; `ORC-GFLCDMFT2S.df124f` |  |
| Fe23Gd6 |  | -4.74 per mol-atom | 298.15 | model |  |  | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 4; `ORC-QHUFQDX7VW.43496f` |  |
| Fe23Gd6 | [Fe23Gd6](https://data.orchid-project.org/compounds/Fe23Gd6.html) | -4.74 kJ/mol-atom | 298.15 | model | 119.903 (mp-aaacpzco) | -1.306 (oqmd-30181) | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 4; `ORC-QHUFQDX7VW.d21cdf` |  |
| Fe2Gd | [Fe2Gd](https://data.orchid-project.org/compounds/Fe2Gd.html) | -11.6 kJ/mol-atom ± 2 | 298.15 | experimental | 1.566 (mp-aaaabdsr) | -3.181 (oqmd-18836) | [2] Zinkevich 2002; _cites Colinet 1987_ | Table 12, p. 13, row 9; `ORC-FGKIBVFKMX.551bc0` |  |
| Fe2Gd |  | -11.6 per mol-atom ± 2 | 298.15 | experimental |  |  | [2] Zinkevich 2002; _cites Colinet 1987_ | Table 12, p. 13, row 9; `ORC-FGKIBVFKMX.ce0b6f` |  |
| Fe2Gd | [Fe2Gd](https://data.orchid-project.org/compounds/Fe2Gd.html) | -11.6 kJ/mol-atom ± 2 | 298.15 | experimental | 1.566 (mp-aaaabdsr) | -3.181 (oqmd-18836) | [3] Zinkevich 2000; _cites Colinet 1987_ [doi](https://doi.org/10.1007/bf02646931) | Table 2, p. 3, row 2; `ORC-XVCLD777MT` |  |
| Fe2Gd | [Fe2Gd](https://data.orchid-project.org/compounds/Fe2Gd.html) | -6.81 kJ/mol-atom | 1078 | model | 1.566 (mp-aaaabdsr) | -3.181 (oqmd-18836) | [2] Zinkevich 2002 | Table 12, p. 13, row 14; `ORC-HXPBIXMIXD.3ba26f` |  |
| Fe2Gd |  | -6.81 per mol-atom | 1078 | model |  |  | [2] Zinkevich 2002 | Table 12, p. 13, row 14; `ORC-HXPBIXMIXD.8deb2a` |  |
| Fe2Gd |  | -5.94 per mol-atom | 298.15 | model |  |  | [2] Zinkevich 2002 | Table 12, p. 13, row 11; `ORC-GXB5PU32U5.707e28` |  |
| Fe2Gd | [Fe2Gd](https://data.orchid-project.org/compounds/Fe2Gd.html) | -5.94 kJ/mol-atom | 298.15 | model | 1.566 (mp-aaaabdsr) | -3.181 (oqmd-18836) | [2] Zinkevich 2002 | Table 12, p. 13, row 11; `ORC-GXB5PU32U5.b8ac0f` |  |
| Fe2Gd | [Fe2Gd](https://data.orchid-project.org/compounds/Fe2Gd.html) | -4.59 kJ/mol-atom | 298.15 | model | 1.566 (mp-aaaabdsr) | -3.181 (oqmd-18836) | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 10; `ORC-DWSOOBGST7.2379bf` |  |
| Fe2Gd |  | -4.59 per mol-atom | 298.15 | model |  |  | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 10; `ORC-DWSOOBGST7.2e5ba1` |  |
| Fe2Gd | [Fe2Gd](https://data.orchid-project.org/compounds/Fe2Gd.html) | -4.38 kJ/mol-atom | 1078 | model | 1.566 (mp-aaaabdsr) | -3.181 (oqmd-18836) | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 13; `ORC-HN34UL6CGG.36704a` |  |
| Fe2Gd |  | -4.38 per mol-atom | 1078 | model |  |  | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 13; `ORC-HN34UL6CGG.cc7c65` |  |
| Fe2Gd | [Fe2Gd](https://data.orchid-project.org/compounds/Fe2Gd.html) | -3.5 kJ/mol-atom ± 1.5 | 1078 | experimental | 1.566 (mp-aaaabdsr) | -3.181 (oqmd-18836) | [2] Zinkevich 2002; _cites Deodhar 1975_ | Table 12, p. 13, row 12; `ORC-HMWXYNWIGB.6907f1` |  |
| Fe2Gd |  | -3.5 per mol-atom ± 1.5 | 1078 | experimental |  |  | [2] Zinkevich 2002; _cites Deodhar 1975_ | Table 12, p. 13, row 12; `ORC-HMWXYNWIGB.dda405` |  |
| Fe2Gd | [Fe2Gd](https://data.orchid-project.org/compounds/Fe2Gd.html) | -3.5 kJ/mol-atom ± 1.5 | 1078 | experimental | 1.566 (mp-aaaabdsr) | -3.181 (oqmd-18836) | [3] Zinkevich 2000; _cites Deodhar 1975_ | Table 2, p. 3, row 1; `ORC-RPGFJXHR3N` |  |
| Fe3Gd | [Fe3Gd](https://data.orchid-project.org/compounds/Fe3Gd.html) | -9.3 kJ/mol-atom ± 1.9 | 298.15 | experimental |  | -3.613 (oqmd-30182) | [3] Zinkevich 2000; _cites Colinet 1987_ [doi](https://doi.org/10.1007/bf02646931) | Table 2, p. 3, row 3; `ORC-C4OO3X3NOB` |  |
| Fe3Gd |  | -9.3 per mol-atom ± 1.9 | 298.15 | experimental |  |  | [2] Zinkevich 2002; _cites Colinet 1987_ | Table 12, p. 13, row 6; `ORC-WP5O6SRVVR.306964` |  |
| Fe3Gd | [Fe3Gd](https://data.orchid-project.org/compounds/Fe3Gd.html) | -9.3 kJ/mol-atom ± 1.9 | 298.15 | experimental |  | -3.613 (oqmd-30182) | [2] Zinkevich 2002; _cites Colinet 1987_ | Table 12, p. 13, row 6; `ORC-WP5O6SRVVR.5cb599` |  |
| Fe3Gd |  | -7.78 per mol-atom | 298.15 | model |  |  | [2] Zinkevich 2002 | Table 12, p. 13, row 8; `ORC-U66H6KLTTF.51c215` |  |
| Fe3Gd | [Fe3Gd](https://data.orchid-project.org/compounds/Fe3Gd.html) | -7.78 kJ/mol-atom | 298.15 | model |  | -3.613 (oqmd-30182) | [2] Zinkevich 2002 | Table 12, p. 13, row 8; `ORC-U66H6KLTTF.65806e` |  |
| Fe3Gd | [Fe3Gd](https://data.orchid-project.org/compounds/Fe3Gd.html) | -4.93 kJ/mol-atom | 298.15 | model |  | -3.613 (oqmd-30182) | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 7; `ORC-JJOX6EABNX.62c265` |  |
| Fe3Gd |  | -4.93 per mol-atom | 298.15 | model |  |  | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 7; `ORC-JJOX6EABNX.663286` |  |

## Other properties

### Phase transition (31)

Table: Phase transition, Fe–Gd system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 468 K | 468 | magnetic: Fe23Gd6; _alloy: Gd 0.206897_ | experimental | [1] Liu 1995 | Table 4, p. 4, row 3; `ORC-M35ZCD25ZZ` |  |
| Phase transition | 472 K | 472 | magnetic: Fe17Gd2; _alloy: Gd 0.105263_ | experimental | [1] Liu 1995 | Table 4, p. 4, row 4; `ORC-UL5H7FCJUC` |  |
| Phase transition | 728 K | 728 | magnetic: Fe3Gd; _alloy: Gd 0.25_ | experimental | [1] Liu 1995 | Table 4, p. 4, row 2; `ORC-NZI43526TQ` |  |
| Phase transition | 782 K | 782 | magnetic: Fe2Gd; _alloy: Gd 0.333333_ | experimental | [1] Liu 1995 | Table 4, p. 4, row 1; `ORC-DIKBV63VWJ` |  |
| Phase transition | 973 K | 973 | αFe + Fe17Gd2; _αFe: Gd 0; Fe17Gd2: Gd 0.105_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 38; `ORC-KTX7EO5GGY` |  |
| Phase transition | 973 K | 973 | αGd + Fe2Gd; _αGd: Gd 0.994; Fe2Gd: Gd 0.333_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 39; `ORC-I6LVDZ2PYW` |  |
| Phase transition | 1164 K | 1164 | Liquid + αGd; _Liquid: Gd 0.75; αGd: Gd 1_ | experimental | [3] Zinkevich 2000; _cites Novy 1961_ | Table 1, p. 2, row 36; `ORC-ZUHSQ2MZVO` |  |
| Phase transition | 1187 K | 1187 | Liquid + Fe2Gd; _Liquid: Gd 0.64; Fe2Gd: Gd 0.333_ | experimental | [3] Zinkevich 2000; _cites Novy 1961_ | Table 1, p. 2, row 35; `ORC-VBL2OFJRHF` |  |
| Phase transition | 1187 K | 1187 | γFe + αFe; _γFe: Gd 0.001; αFe: Gd 0.002_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 27; `ORC-BRSKAC6L7O` |  |
| Phase transition | 1193 K | 1193 | γFe + αFe; _γFe: Gd 0.002; αFe: Gd 0.003_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 28; `ORC-P6HSLXKJHA` |  |
| Phase transition | 1332 K | 1332 | Liquid + Fe3Gd; _Liquid: Gd 0.55; Fe3Gd: Gd 0.25_ | experimental | [3] Zinkevich 2000; _cites Novy 1961_ | Table 1, p. 2, row 33; `ORC-XZWDZTZ762` |  |
| Phase transition | 1348 K | 1348 | Liquid + Fe2Gd; _Liquid: Gd 0.579; Fe2Gd: Gd 0.333_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 34; `ORC-DZHSRADB3X` |  |
| Phase transition | 1424 K | 1424 | Liquid + Fe17Gd2; _Liquid: Gd 0.453; Fe17Gd2: Gd 0.105_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 31; `ORC-B4L27SFZOC` |  |
| Phase transition | 1464 K | 1464 | Liquid + Fe17Gd2; _Liquid: Gd 0.403; Fe17Gd2: Gd 0.105_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 30; `ORC-5P5X6N7QR6` |  |
| Phase transition | 1482 K | 1482 | Liquid + αGd; _Liquid: Gd 0.93; αGd: Gd 1_ | experimental | [3] Zinkevich 2000; _cites Novy 1961_ | Table 1, p. 2, row 37; `ORC-EX7VEN4JXM` |  |
| Phase transition | 1488 K | 1488 | Fe17Gd2 (r) + Fe17Gd2 (h); _Fe17Gd2 (r): Gd 0.105; Fe17Gd2 (h): Gd 0.105_ | experimental | [3] Zinkevich 2000; _cites Atiq 1990_ [doi](https://doi.org/10.1179/mst.1990.6.8.778) | Table 1, p. 2, row 32; `ORC-BGHHP2LFQJ` |  |
| Phase transition | 1488 K | 1488 | polymorphic: Fe17Gd2(H) \<=> Fe17Gd2(R); _Fe17Gd2(H): Gd 0.105263; Fe17Gd2(R): Gd 0.105263_ | experimental | [2] Zinkevich 2002; _cites Atiq 1990_ | Table 2, p. 3, row 31; `ORC-LXCM3WZNOM` |  |
| Phase transition | 1488 K | 1488 | polymorphic: Fe17Gd2(H) \<=> Fe17Gd2(R); _Fe17Gd2(H): Gd 0.105263; Fe17Gd2(R): Gd 0.105263_ | model | [2] Zinkevich 2002 | Table 2, p. 3, row 32; `ORC-WFU6RNZAXX` |  |
| Phase transition | 1494 K | 1494 | Liquid + Fe17Gd2; _Liquid: Gd 0.343; Fe17Gd2: Gd 0.105_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 29; `ORC-SE4O7TOOHO` |  |
| Phase transition | 1663 K | 1663 | δFe + γFe; _δFe: Gd 0.018; γFe: Gd 0.007_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 26; `ORC-VWRNSFRLTW` |  |
| Phase transition | 1681 K | 1681 | Liquid + δFe; _Liquid: Gd 0.135; δFe: Gd 0.013_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 19; `ORC-3PUAZ36K3Q` |  |
| Phase transition | 1681 K | 1681 | δFe + γFe; _δFe: Gd 0.016; γFe: Gd 0.003_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 25; `ORC-6HFB3APYWU` |  |
| Phase transition | 1701 K | 1701 | Liquid + δFe; _Liquid: Gd 0.127; δFe: Gd 0.016_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 24; `ORC-ANNFTCHZ2G` |  |
| Phase transition | 1732 K | 1732 | Liquid + δFe; _Liquid: Gd 0.089; δFe: Gd 0.005_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 18; `ORC-WXJCLISLSC` |  |
| Phase transition | 1744 K | 1744 | Liquid + δFe; _Liquid: Gd 0.085; δFe: Gd 0.011_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 23; `ORC-7DXVSQR5E6` |  |
| Phase transition | 1747 K | 1747 | Liquid + δFe; _Liquid: Gd 0.042; δFe: Gd 0.011_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 22; `ORC-5ZRSZQNKZA` |  |
| Phase transition | 1770 K | 1770 | Liquid + δFe; _Liquid: Gd 0.024; δFe: Gd 0.008_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 21; `ORC-RESLJJRS5R` |  |
| Phase transition | 1777 K | 1777 | Liquid + δFe; _Liquid: Gd 0.042; δFe: Gd 0.003_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 17; `ORC-NL7ZCJCFTU` |  |
| Phase transition | 1780 K | 1780 | Liquid + δFe; _Liquid: Gd 0.008; δFe: Gd 0.001_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1970_ | Table 1, p. 2, row 20; `ORC-V5NWOUTUU7` |  |
| Phase transition | 1792 K | 1792 | Liquid + δFe; _Liquid: Gd 0.007; δFe: Gd 0.007_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 15; `ORC-F2H43KRARB` |  |
| Phase transition | 1797 K | 1797 | Liquid + δFe; _Liquid: Gd 0.022; δFe: Gd 0.001_ | experimental | [3] Zinkevich 2000; _cites Savitskii 1961_ | Table 1, p. 2, row 16; `ORC-JMM246AMRG` |  |

### Heat capacity / entropy / enthalpy (13)

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

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: °ST_ | 38.6 per mol-atom ± 0.5 | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | experimental | [2] Zinkevich 2002; _cites Germano 1981_ | Table 12, p. 13, row 15; `ORC-3CGZJZTPCB.80b343` |  |
| Entropy; _printed: °ST_ | 38.6 J/mol-atom/K ± 0.5 | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | experimental | [2] Zinkevich 2002; _cites Germano 1981_ | Table 12, p. 13, row 15; `ORC-3CGZJZTPCB.875a26` |  |
| Entropy; _printed: S°_ | 38.63 J/mol-atom/K ± 0.5 | 298.15 | Fe2Gd; _alloy: Fe 0.667, Gd 0.333_ | experimental | [3] Zinkevich 2000; _cites Germano 1981_ [doi](https://doi.org/10.1016/0022-4596%2881%2990500-4) | Table 2, p. 3, row 6; `ORC-7XTBZMJVLP` |  |
| Entropy; _printed: °ST_ | 38.58 per mol-atom | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | model | [2] Zinkevich 2002 | Table 12, p. 13, row 17; `ORC-OGXJFQYTNN.0dd00b` |  |
| Entropy; _printed: °ST_ | 38.58 J/mol-atom/K | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | model | [2] Zinkevich 2002 | Table 12, p. 13, row 17; `ORC-OGXJFQYTNN.b80c81` |  |
| Entropy; _printed: °ST_ | 38.62 J/mol-atom/K | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | model | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 16; `ORC-YQBNZ6JUFR.e9af3a` |  |
| Entropy; _printed: °ST_ | 38.62 per mol-atom | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | model | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 16; `ORC-YQBNZ6JUFR.fe43f0` |  |
| Heat capacity; _printed: CP_ | 29.18 J/mol-atom/K | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | model | [2] Zinkevich 2002 | Table 12, p. 13, row 20; `ORC-BPMLEIWQZ5.621102` |  |
| Heat capacity; _printed: CP_ | 29.18 per mol-atom | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | model | [2] Zinkevich 2002 | Table 12, p. 13, row 20; `ORC-BPMLEIWQZ5.d8269d` |  |
| Heat capacity; _printed: CP_ | 27.8 per mol-atom | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | model | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 19; `ORC-NTQCLN4CPW.5e6805` |  |
| Heat capacity; _printed: CP_ | 27.8 J/mol-atom/K | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | model | [2] Zinkevich 2002; _cites Zinkevich 2000_ | Table 12, p. 13, row 19; `ORC-NTQCLN4CPW.b9ffa9` |  |
| Heat capacity; _printed: CP_ | 29.2 J/mol-atom/K ± 0.5 | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | experimental | [2] Zinkevich 2002; _cites Germano 1981_ | Table 12, p. 13, row 18; `ORC-XV3BI7QYUX.1323e3` |  |
| Heat capacity; _printed: CP_ | 29.2 per mol-atom ± 0.5 | 298.15 | Fe2Gd; _alloy: Gd 0.333333_ | experimental | [2] Zinkevich 2002; _cites Germano 1981_ | Table 12, p. 13, row 18; `ORC-XV3BI7QYUX.3c44ad` |  |

## 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)
2. Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002). [doi:10.1034/j.1600-0692.2002.311310106.x](https://doi.org/10.1034/j.1600-0692.2002.311310106.x)
3. M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000). [doi:10.1361/105497100770339923](https://doi.org/10.1361/105497100770339923)

## 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/).