# Fe–Tm system

> Fe–Tm system: 92 accepted literature values (heat capacity / entropy / enthalpy 41, formation 26, invariant reaction 20, phase transition 5) and 2 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

92 accepted literature values from 1 paper(s) (experimental 18, model 73, DFT 1); 2 calculated phase diagram(s). 1 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-TM.json) · [CSV](https://data.orchid-project.org/systems/FE-TM.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#FE-TM) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#FE-TM/FeTm-14Kar.json) · [phases (8)](https://data.orchid-project.org/phases/pages/FE-TM.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/FE-TM.html) · [Markdown](https://data.orchid-project.org/systems/FE-TM.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 18 |
| model | 73 |
| DFT | 1 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 20 |
| phase transition | 5 |
| formation | 26 |
| heat capacity / entropy / enthalpy | 41 |

## 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 |
|---|---|---|---|
| FeTm-14Kar.tdb | S. Kardellas, C. Servant, N. Selhaoui, A. Iddaoudi, Calphad, 46, 42-54(2014). [doi:10.1016/j.calphad.2014.01.003](https://doi.org/10.1016/j.calphad.2014.01.003) | `33698064a8ea2f8ddedbae256484e30178374ec8f1f3afaed5bff2c81952699c` | [viewer](https://orchid-project.org/phase-diagrams/#FE-TM/FeTm-14Kar.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeTm-14Kar.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeTm-14Kar.json) |
| FeTm-19Xu.tdb | L. Xu, J. Wang, S. Li, X.L. Chen, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 66, 101646(2019). [doi:10.1016/j.calphad.2019.101646](https://doi.org/10.1016/j.calphad.2019.101646) | `2d52128c27ee96d205d87d0a56fb8911dd31bc63a8da294cc85d3051184bf0ec` | [viewer](https://orchid-project.org/phase-diagrams/#FE-TM/FeTm-19Xu.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeTm-19Xu.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeTm-19Xu.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| FeTm-14Kar.tdb | 1667.47 | BCC_A2 (x(Tm) 0) + FCC_A1 (x(Tm) 0) + LIQUID (x(Tm) 0.06755) |
| FeTm-14Kar.tdb | 1667.47 | FCC_A1 (x(Tm) 0) + BCC_A2 (x(Tm) 0) + LIQUID (x(Tm) 0.0675) |
| FeTm-14Kar.tdb | 1564.43 | FCC_A1 (x(Tm) 0) + FE17TM2 (x(Tm) 0.10526) + LIQUID (x(Tm) 0.11031) |
| FeTm-14Kar.tdb | 1564.42 | FCC_A1 (x(Tm) 0) + FE17TM2 (x(Tm) 0.10526) + LIQUID (x(Tm) 0.11068) |
| FeTm-14Kar.tdb | 1549.2 | LIQUID (x(Tm) 0.24338) + FE3TM (x(Tm) 0.25) + FE2TM_C15 (x(Tm) 0.33333) |
| FeTm-14Kar.tdb | 1549.2 | LIQUID (x(Tm) 0.24328) + FE3TM (x(Tm) 0.25) + FE2TM_C15 (x(Tm) 0.33333) |
| FeTm-14Kar.tdb | 1549.2 | LIQUID (x(Tm) 0.24345) + FE3TM (x(Tm) 0.25) + FE2TM_C15 (x(Tm) 0.33333) |
| FeTm-14Kar.tdb | 1536.62 | LIQUID (x(Tm) 0.19508) + FE23TM6_D8A (x(Tm) 0.2069) + FE3TM (x(Tm) 0.25) |
| FeTm-14Kar.tdb | 1536.62 | LIQUID (x(Tm) 0.19508) + FE23TM6_D8A (x(Tm) 0.2069) + FE3TM (x(Tm) 0.25) |
| FeTm-14Kar.tdb | 1536.62 | LIQUID (x(Tm) 0.19553) + FE23TM6_D8A (x(Tm) 0.2069) + FE3TM (x(Tm) 0.25) |
| FeTm-14Kar.tdb | 1536.62 | LIQUID (x(Tm) 0.19552) + FE23TM6_D8A (x(Tm) 0.2069) + FE3TM (x(Tm) 0.25) |
| FeTm-14Kar.tdb | 1532.92 | FE17TM2 (x(Tm) 0.10526) + LIQUID (x(Tm) 0.17757) + FE23TM6_D8A (x(Tm) 0.2069) |
| FeTm-14Kar.tdb | 1532.92 | FE17TM2 (x(Tm) 0.10526) + LIQUID (x(Tm) 0.17683) + FE23TM6_D8A (x(Tm) 0.2069) |
| FeTm-14Kar.tdb | 1532.91 | FE17TM2 (x(Tm) 0.10526) + LIQUID (x(Tm) 0.17725) + FE23TM6_D8A (x(Tm) 0.2069) |
| FeTm-14Kar.tdb | 1184.81 | BCC_A2 (x(Tm) 0) + FCC_A1 (x(Tm) 0) + FE17TM2 (x(Tm) 0.10526) |
| FeTm-14Kar.tdb | 1182.58 | FE2TM_C15 (x(Tm) 0.33333) + LIQUID (x(Tm) 0.7532) + HCP_A3 (x(Tm) 0.99552) |
| FeTm-14Kar.tdb | 1182.58 | FE2TM_C15 (x(Tm) 0.33333) + LIQUID (x(Tm) 0.75333) + HCP_A3 (x(Tm) 0.99552) |
| FeTm-14Kar.tdb | 485.61 | FE17TM2 (x(Tm) 0.10526) + FE23TM6_D8A (x(Tm) 0.2069) + FE3TM (x(Tm) 0.25) |
| FeTm-14Kar.tdb | 438.33 | FE17TM2 (x(Tm) 0.10526) + FE23TM6_D8A (x(Tm) 0.2069) + FE3TM (x(Tm) 0.25) |
| FeTm-14Kar.tdb | 317.66 | BCC_A2 (x(Tm) 0) + FE17TM2 (x(Tm) 0.10526) + FE23TM6_D8A (x(Tm) 0.2069) |
| FeTm-19Xu.tdb | 1667.47 | BCC_A2 (x(Tm) 0) + FCC_A1 (x(Tm) 0) + LIQUID (x(Tm) 0.08657) |
| FeTm-19Xu.tdb | 1667.47 | FCC_A1 (x(Tm) 0) + BCC_A2 (x(Tm) 0) + LIQUID (x(Tm) 0.08652) |
| FeTm-19Xu.tdb | 1573.32 | FCC_A1 (x(Tm) 0) + FE17TM2 (x(Tm) 0.10526) + LIQUID (x(Tm) 0.14373) |
| FeTm-19Xu.tdb | 1573.32 | FCC_A1 (x(Tm) 0) + FE17TM2 (x(Tm) 0.10526) + LIQUID (x(Tm) 0.14371) |
| FeTm-19Xu.tdb | 1552.41 | FE3TM (x(Tm) 0.25) + LIQUID (x(Tm) 0.25571) + FE2TM_C15 (x(Tm) 0.33333) |
| FeTm-19Xu.tdb | 1552.41 | FE3TM (x(Tm) 0.25) + LIQUID (x(Tm) 0.25526) + FE2TM_C15 (x(Tm) 0.33333) |
| FeTm-19Xu.tdb | 1552.41 | FE3TM (x(Tm) 0.25) + LIQUID (x(Tm) 0.25588) + FE2TM_C15 (x(Tm) 0.33333) |
| FeTm-19Xu.tdb | 1547.2 | FE23TM6_D8A (x(Tm) 0.2069) + LIQUID (x(Tm) 0.21082) + FE3TM (x(Tm) 0.25) |
| FeTm-19Xu.tdb | 1546.93 | FE17TM2 (x(Tm) 0.10526) + LIQUID (x(Tm) 0.19764) + FE23TM6_D8A (x(Tm) 0.2069) |
| FeTm-19Xu.tdb | 1209.47 | FE2TM_C15 (x(Tm) 0.33333) + LIQUID (x(Tm) 0.6655) + HCP_A3 (x(Tm) 0.99888) |
| FeTm-19Xu.tdb | 1209.47 | FE2TM_C15 (x(Tm) 0.33333) + LIQUID (x(Tm) 0.66558) + HCP_A3 (x(Tm) 0.99887) |
| FeTm-19Xu.tdb | 1184.81 | FCC_A1 (x(Tm) 0) + BCC_A2 (x(Tm) 0) + FE17TM2 (x(Tm) 0.10526) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/FE/FE-TM.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/FE/FE-TM.json) · [CALPHAD hull FeTm-14Kar](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-TM--FeTm-14Kar.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Fe–Tm system (20)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1667.15 | metatectic/catatectic: Liq + deltaFe \<-> gammaFe | deltaFe: Tm 0; gammaFe: Tm 0.067 | model | [1] Kardellass 2014 | Table 8, p. 10, row 7; `ORC-BQP5BHEQTK.3d9bd8` |  |
| 1667.15 | metatectic/catatectic: Liq + deltaFe \<-> gammaFe | Liq: Tm 0; deltaFe: Tm 0; gammaFe: Tm 0.067 | model | [1] Kardellass 2014 | Table 8, p. 10, row 6; `ORC-BQP5BHEQTK.406781` |  |
| 1667.15 | metatectic/catatectic: Liq + deltaFe \<-> gammaFe | Liq: Tm 0; deltaFe: Tm 0; gammaFe: Tm 0.094 | experimental | [1] Kardellass 2014; _cites Okamoto 1993_ | Table 8, p. 10, row 5; `ORC-PNUVPYDP45` |  |
| 1573.15 | peritectic: L + gammaFe \<-> Fe17Tm2 | L: Tm 0.125; gammaFe: Tm 0; Fe17Tm2: Tm 0.105 | experimental | [1] Kardellass 2014; _cites Okamoto 1993_ | Table 8, p. 10, row 8; `ORC-QXI5UHKJ7Z` |  |
| 1567.15 | peritectic: L + gammaFe \<-> Fe17Tm2 | L: Tm 0.11; gammaFe: Tm 0; Fe17Tm2: Tm 0.105 | model | [1] Kardellass 2014 | Table 8, p. 10, row 9; `ORC-Z3ISWT7IUJ` |  |
| 1565.15 | peritectic: L + gammaFe \<-> Fe17Tm2 | L: Tm 0.11; gammaFe: Tm 0; Fe17Tm2: Tm 0.105 | model | [1] Kardellass 2014 | Table 8, p. 10, row 10; `ORC-M276HP2VQI` |  |
| 1553.15 | peritectic: L + Fe2Tm \<-> Fe3Tm | L: Tm 0.2; Fe2Tm: Tm 0.333; Fe3Tm: Tm 0.25 | experimental | [1] Kardellass 2014; _cites Okamoto 1993_ | Table 8, p. 10, row 20; `ORC-GDJ2R6RJFK` |  |
| 1549.15 | peritectic: L + Fe2Tm \<-> Fe3Tm | L: Tm 0.243; Fe2Tm: Tm 0.333; Fe3Tm: Tm 0.25 | model | [1] Kardellass 2014 | Table 8, p. 10, row 22; `ORC-CE75GNYD3L.80272d` |  |
| 1549.15 | peritectic: L + Fe2Tm \<-> Fe3Tm | L: Tm 0.242; Fe2Tm: Tm 0.333; Fe3Tm: Tm 0.25 | model | [1] Kardellass 2014 | Table 8, p. 10, row 21; `ORC-CE75GNYD3L.fa49ef` |  |
| 1543.15 | peritectic: L + Fe3Tm \<-> Fe23Tm6 | L: Tm 0.187; Fe3Tm: Tm 0.25; Fe23Tm6: Tm 0.206 | experimental | [1] Kardellass 2014; _cites Okamoto 1993_ | Table 8, p. 10, row 17; `ORC-JJNSFXAIJM` |  |
| 1539.15 | peritectic: L + Fe3Tm \<-> Fe23Tm6 | L: Tm 0.199; Fe3Tm: Tm 0.25; Fe23Tm6: Tm 0.206 | model | [1] Kardellass 2014 | Table 8, p. 10, row 19; `ORC-2KUB2QTGVD` |  |
| 1537.15 | peritectic: L + Fe3Tm \<-> Fe23Tm6 | L: Tm 0.195; Fe3Tm: Tm 0.25; Fe23Tm6: Tm 0.206 | model | [1] Kardellass 2014 | Table 8, p. 10, row 18; `ORC-7UKOEN7WGK` |  |
| 1534.15 | eutectic: L \<-> Fe17Tm2 + Fe23Tm6 | L: Tm 0.176; Fe17Tm2: Tm 0.105; Fe23Tm6: Tm 0.206 | model | [1] Kardellass 2014 | Table 8, p. 10, row 16; `ORC-PPFON2ZOBM` |  |
| 1533.15 | eutectic: L \<-> Fe17Tm2 + Fe23Tm6 | L: Tm 0.176; Fe17Tm2: Tm 0.105; Fe23Tm6: Tm 0.206 | model | [1] Kardellass 2014 | Table 8, p. 10, row 15; `ORC-ODGN5UKBGF` |  |
| 1528.15 | eutectic: L \<-> Fe17Tm2 + Fe23Tm6 | L: Tm 0.16; Fe17Tm2: Tm 0.105; Fe23Tm6: Tm 0.206 | experimental | [1] Kardellass 2014; _cites Okamoto 1993_ | Table 8, p. 10, row 14; `ORC-JXGYT5YQ5N` |  |
| 1210.15 | eutectic: L \<-> Fe2Tm + (alphaTm) | L: Tm 0.73; Fe2Tm: Tm 0.333; (alphaTm): Tm 1 | experimental | [1] Kardellass 2014; _cites Okamoto 1993_ | Table 8, p. 10, row 28; `ORC-Q3WZOLBHYC` |  |
| 1182.15 | eutectic: L \<-> Fe2Tm + (alphaTm) | L: Tm 0.753; Fe2Tm: Tm 0.333; (alphaTm): Tm 1 | model | [1] Kardellass 2014 | Table 8, p. 10, row 29; `ORC-BUKVPU74Q2` |  |
| 1181.15 | eutectic: L \<-> Fe2Tm + (alphaTm) | L: Tm 0.753; Fe2Tm: Tm 0.333; (alphaTm): Tm 1 | model | [1] Kardellass 2014 | Table 8, p. 10, row 30; `ORC-DNDCVJSTQL` |  |
| 427.85 | other: Fe17Tm2(no stable) \<-> alphaFe + Fe23Tm6 | Fe17Tm2(no stable): Tm 0.105; alphaFe: Tm 0; Fe23Tm6: Tm 0.206 | model | [1] Kardellass 2014 | Table 8, p. 10, row 26; `ORC-4742FTMAFO` |  |
| 273.15 | other: Fe17Tm2(no stable) \<-> alphaFe + Fe23Tm6 | Fe17Tm2(no stable): Tm 0.105; alphaFe: Tm 0; Fe23Tm6: Tm 0.206897 | model | [1] Kardellass 2014 | Table 8, p. 10, row 27; `ORC-SFAS5QXREJ` |  |

## 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–Tm system (25)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Fe17Tm2 | [Fe17Tm2](https://data.orchid-project.org/compounds/Fe17Tm2.html) | -4.17 kJ/mol-atom ± 0.04 | 959 | experimental | -2.217 (mp-aaaabtim) | -2.548 (oqmd-89408) | [1] Kardellass 2014; _cites Gozzi 2007_ [doi](https://doi.org/10.1021/je7003353) | Table 3, p. 4, row 2; `ORC-TF32XM44CY.465c75` |  |
| Fe17Tm2 | [Fe17Tm2](https://data.orchid-project.org/compounds/Fe17Tm2.html) | -2.35 kJ/mol-atom | 298.15 | model | -2.217 (mp-aaaabtim) | -2.548 (oqmd-89408) | [1] Kardellass 2014; _cites Konar 2012_ | Table 3, p. 4, row 4; `ORC-V2RQFASPYZ.cdf845` |  |
| Fe17Tm2 | [Fe17Tm2](https://data.orchid-project.org/compounds/Fe17Tm2.html) | -2.22 kJ/mol-atom | 298.15 | model | -2.217 (mp-aaaabtim) | -2.548 (oqmd-89408) | [1] Kardellass 2014; _cites Kardellass 2013_ | Table 3, p. 4, row 1; `ORC-VYOR75JX5X.184713` |  |
| Fe17Tm2 | [Fe17Tm2](https://data.orchid-project.org/compounds/Fe17Tm2.html) | -2 kJ/mol-atom | 298.15 | model | -2.217 (mp-aaaabtim) | -2.548 (oqmd-89408) | [1] Kardellass 2014; _cites De 1988_ | Table 3, p. 4, row 3; `ORC-XUFQXPK4YJ.334d59` |  |
| Fe17Tm2 | [Fe17Tm2](https://data.orchid-project.org/compounds/Fe17Tm2.html) | -0.113 kJ/mol-atom | 298.15 | model | -2.217 (mp-aaaabtim) | -2.548 (oqmd-89408) | [1] Kardellass 2014 | Table 3, p. 4, row 6; `ORC-KVZPQN4KHH.a611a9` |  |
| Fe17Tm2 | [Fe17Tm2](https://data.orchid-project.org/compounds/Fe17Tm2.html) | 0.2 kJ/mol-atom | 298.15 | model | -2.217 (mp-aaaabtim) | -2.548 (oqmd-89408) | [1] Kardellass 2014 | Table 3, p. 4, row 5; `ORC-H4NKUXML7D.b09f14` |  |
| Fe23Tm6 | [Fe23Tm6](https://data.orchid-project.org/compounds/Fe23Tm6.html) | -6.38 kJ/mol-atom | 298.15 | model | -8.309 (mp-aaacpxgm) | -7.986 (oqmd-30263) | [1] Kardellass 2014; _cites Konar 2012_ | Table 3, p. 4, row 8; `ORC-JP5XRFTHM7.97fd78` |  |
| Fe23Tm6 | [Fe23Tm6](https://data.orchid-project.org/compounds/Fe23Tm6.html) | -4.33 kJ/mol-atom | 298.15 | model | -8.309 (mp-aaacpxgm) | -7.986 (oqmd-30263) | [1] Kardellass 2014; _cites Kardellass 2013_ | Table 3, p. 4, row 7; `ORC-PJB2QNLY32.d40d6e` |  |
| Fe23Tm6 | [Fe23Tm6](https://data.orchid-project.org/compounds/Fe23Tm6.html) | -2.85 kJ/mol-atom | 298.15 | model | -8.309 (mp-aaacpxgm) | -7.986 (oqmd-30263) | [1] Kardellass 2014 | Table 3, p. 4, row 9; `ORC-FJFK6YCWPH.271d7b` |  |
| Fe23Tm6 | [Fe23Tm6](https://data.orchid-project.org/compounds/Fe23Tm6.html) | -1.515 kJ/mol-atom | 298.15 | model | -8.309 (mp-aaacpxgm) | -7.986 (oqmd-30263) | [1] Kardellass 2014 | Table 3, p. 4, row 10; `ORC-PV2TBSQX43.822ba6` |  |
| Fe2Tm |  | -13.4 kJ/mol-atom | 298.15 | DFT |  |  | [1] Kardellass 2014; _cites Meschel 2013_ [doi](https://doi.org/10.1016/j.jallcom.2012.11.035) | Table 3, p. 4, row 19; `ORC-ZP36O53ECO.a79bab` |  |
| Fe2Tm | [Fe2Tm](https://data.orchid-project.org/compounds/Fe2Tm.html) | -11.53 kJ/mol-atom | 298.15 | model | -13.808 (mp-aaabgmyp) | -13.506 (oqmd-17236) | [1] Kardellass 2014; _cites Konar 2012_ | Table 3, p. 4, row 23; `ORC-7V2FGD2V5U.2b67d4` |  |
| Fe2Tm | [Fe2Tm](https://data.orchid-project.org/compounds/Fe2Tm.html) | -6.7 kJ/mol-atom | 298.15 | model | -13.808 (mp-aaabgmyp) | -13.506 (oqmd-17236) | [1] Kardellass 2014; _cites Dariel 1974_ [doi](https://doi.org/10.1016/0022-5088%2874%2990175-1) | Table 3, p. 4, row 18; `ORC-NN5ZZH6VCS.8920a3` |  |
| Fe2Tm | [Fe2Tm](https://data.orchid-project.org/compounds/Fe2Tm.html) | -6.5 kJ/mol-atom | 298.15 | model | -13.808 (mp-aaabgmyp) | -13.506 (oqmd-17236) | [1] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 3, p. 4, row 17; `ORC-5Q6F5EA3XX.75ddb1` |  |
| Fe2Tm | [Fe2Tm](https://data.orchid-project.org/compounds/Fe2Tm.html) | -6.19 kJ/mol-atom | 298.15 | model | -13.808 (mp-aaabgmyp) | -13.506 (oqmd-17236) | [1] Kardellass 2014; _cites Kardellass 2013_ | Table 3, p. 4, row 16; `ORC-D7MS5DAV4X.687fb2` |  |
| Fe2Tm | [Fe2Tm](https://data.orchid-project.org/compounds/Fe2Tm.html) | -5.98 kJ/mol-atom | 300 | experimental | -13.808 (mp-aaabgmyp) | -13.506 (oqmd-17236) | [1] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 3, p. 4, row 22; `ORC-NUHO6HHWO3.48b29d` |  |
| Fe2Tm | [Fe2Tm](https://data.orchid-project.org/compounds/Fe2Tm.html) | -5.7 kJ/mol-atom | 290 | experimental | -13.808 (mp-aaabgmyp) | -13.506 (oqmd-17236) | [1] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 3, p. 4, row 21; `ORC-3DFCHE5IR2.552874` |  |
| Fe2Tm | [Fe2Tm](https://data.orchid-project.org/compounds/Fe2Tm.html) | -5.042 kJ/mol-atom | 298.15 | model | -13.808 (mp-aaabgmyp) | -13.506 (oqmd-17236) | [1] Kardellass 2014 | Table 3, p. 4, row 24; `ORC-R3WXFRC5LR.8068cd` |  |
| Fe2Tm | [Fe2Tm](https://data.orchid-project.org/compounds/Fe2Tm.html) | -2.46 kJ/mol-atom | 298.15 | model | -13.808 (mp-aaabgmyp) | -13.506 (oqmd-17236) | [1] Kardellass 2014 | Table 3, p. 4, row 25; `ORC-WPCS2KBO5J.ff88ae` |  |
| Fe2Tm | [Fe2Tm](https://data.orchid-project.org/compounds/Fe2Tm.html) | -2.2 kJ/mol-atom ± 2.8 | 298.15 | experimental | -13.808 (mp-aaabgmyp) | -13.506 (oqmd-17236) | [1] Kardellass 2014; _cites Meschel 2013_ [doi](https://doi.org/10.1016/j.jallcom.2012.11.035) | Table 3, p. 4, row 20; `ORC-F35LRX32BU` |  |
| Fe3Tm | [Fe3Tm](https://data.orchid-project.org/compounds/Fe3Tm.html) | -8.41 kJ/mol-atom | 298.15 | model | -11.021 (mp-aaacktrr) | -11.055 (oqmd-30262) | [1] Kardellass 2014; _cites Konar 2012_ | Table 3, p. 4, row 13; `ORC-ADCPLVYY3L.77bea2` |  |
| Fe3Tm | [Fe3Tm](https://data.orchid-project.org/compounds/Fe3Tm.html) | -5.1 kJ/mol-atom | 298.15 | model | -11.021 (mp-aaacktrr) | -11.055 (oqmd-30262) | [1] Kardellass 2014; _cites Kardellass 2013_ | Table 3, p. 4, row 11; `ORC-JXPWITTG5L.5d1d80` |  |
| Fe3Tm | [Fe3Tm](https://data.orchid-project.org/compounds/Fe3Tm.html) | -5 kJ/mol-atom | 298.15 | model | -11.021 (mp-aaacktrr) | -11.055 (oqmd-30262) | [1] Kardellass 2014; _cites De 1988_ | Table 3, p. 4, row 12; `ORC-UH7SCJEUB5.3c6ccc` |  |
| Fe3Tm | [Fe3Tm](https://data.orchid-project.org/compounds/Fe3Tm.html) | -3.366 kJ/mol-atom | 298.15 | model | -11.021 (mp-aaacktrr) | -11.055 (oqmd-30262) | [1] Kardellass 2014 | Table 3, p. 4, row 14; `ORC-IAH3PPW35K.e1d15a` |  |
| Fe3Tm | [Fe3Tm](https://data.orchid-project.org/compounds/Fe3Tm.html) | -2.148 kJ/mol-atom | 298.15 | model | -11.021 (mp-aaacktrr) | -11.055 (oqmd-30262) | [1] Kardellass 2014 | Table 3, p. 4, row 15; `ORC-RTODDWTW2Z.80388c` |  |

## Other properties

### Phase transition (5)

Table: Phase transition, Fe–Tm system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1573.15 K | 1573.15 | congruent melting: L \<-> Fe2Tm; _L: Tm 0.333; Fe2Tm: Tm 0.333_ | experimental | [1] Kardellass 2014; _cites Okamoto 1993_ | Table 8, p. 10, row 23; `ORC-K7VPHZWOX5` |  |
| Phase transition | 1575.15 K | 1575.15 | congruent melting: L \<-> Fe2Tm; _L: Tm 0.333; Fe2Tm: Tm 0.333_ | model | [1] Kardellass 2014 | Table 8, p. 10, row 25; `ORC-3EW4P6DHVJ` |  |
| Phase transition | 1576.15 K | 1576.15 | congruent melting: L \<-> Fe2Tm; _L: Tm 0.333; Fe2Tm: Tm 0.333_ | model | [1] Kardellass 2014 | Table 8, p. 10, row 24; `ORC-Q4USDRH2IS` |  |
| Phase transition | 1811.15 K | 1811.15 | congruent melting: Liq \<-> deltaFe; _Liq: Tm 0; deltaFe: Tm 0_ | model | [1] Kardellass 2014 | Table 8, p. 10, row 2; `ORC-TRJO5OJPU6` |  |
| Phase transition | 1812.15 K | 1812.15 | congruent melting: Liq \<-> deltaFe; _Liq: Tm 0; deltaFe: Tm 0_ | experimental | [1] Kardellass 2014; _cites Okamoto 1993_ | Table 8, p. 10, row 1; `ORC-5J4PSDX6Q6` |  |

### Formation (1)

Table: Formation, Fe–Tm system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy of formation; _printed: ΔfST_ | 1.37 unknown ± 0.01 | 959 | Fe17Tm2; _alloy: Tm 0.105263_ | experimental | [1] Kardellass 2014; _cites Gozzi 2007_ [doi](https://doi.org/10.1021/je7003353) | Table 3, p. 4, row 2; `ORC-TF32XM44CY.98d07a` |  |

### Heat capacity / entropy / enthalpy (41)

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

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: ΔfS_ | 41.776 J/mol-atom/K | 290 | Fe2Tm; _alloy: Tm 0.333333_ | experimental | [1] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 3, p. 4, row 21; `ORC-3DFCHE5IR2.0d65b1` |  |
| Entropy; _printed: ΔfS_ | 37.44 J/mol-atom/K | 298.15 | Fe17Tm2; _alloy: Tm 0.105263_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 5; `ORC-H4NKUXML7D.963479` |  |
| Entropy; _printed: ΔfS_ | 37.87 J/mol-atom/K | 298.15 | Fe17Tm2; _alloy: Tm 0.105263_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 6; `ORC-KVZPQN4KHH.8a056a` |  |
| Entropy; _printed: ΔfS_ | 38.1 J/mol-atom/K | 298.15 | Fe17Tm2; _alloy: Tm 0.105263_ | model | [1] Kardellass 2014; _cites Konar 2012_ | Table 3, p. 4, row 4; `ORC-V2RQFASPYZ.e723e3` |  |
| Entropy; _printed: ΔfS_ | 39.69 J/mol-atom/K | 298.15 | Fe23Tm6; _alloy: Tm 0.206897_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 9; `ORC-FJFK6YCWPH.9a2e46` |  |
| Entropy; _printed: ΔfS_ | 42.34 J/mol-atom/K | 298.15 | Fe23Tm6; _alloy: Tm 0.206897_ | model | [1] Kardellass 2014; _cites Konar 2012_ | Table 3, p. 4, row 8; `ORC-JP5XRFTHM7.16774f` |  |
| Entropy; _printed: ΔfS_ | 42.92 J/mol-atom/K | 298.15 | Fe23Tm6; _alloy: Tm 0.206897_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 10; `ORC-PV2TBSQX43.565cc0` |  |
| Entropy; _printed: ΔfS_ | 42.67 J/mol-atom/K | 298.15 | Fe2Tm; _alloy: Tm 0.333333_ | model | [1] Kardellass 2014; _cites Konar 2012_ | Table 3, p. 4, row 23; `ORC-7V2FGD2V5U.6e8efa` |  |
| Entropy; _printed: ΔfS (▼ experimental data)_ | 42.52 J/mol-atom/K | 298.15 | Fe2Tm; _alloy: Tm 0.333333_ | experimental | [1] Kardellass 2014 | Table 3, p. 4, row 26; `ORC-QI2OQCE5ZB` |  |
| Entropy; _printed: ΔfS_ | 44.61 J/mol-atom/K | 298.15 | Fe2Tm; _alloy: Tm 0.333333_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 24; `ORC-R3WXFRC5LR.ed093c` |  |
| Entropy; _printed: ΔfS_ | 49.37 J/mol-atom/K | 298.15 | Fe2Tm; _alloy: Tm 0.333333_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 25; `ORC-WPCS2KBO5J.d7ea67` |  |
| Entropy; _printed: ΔfS_ | 42.75 J/mol-atom/K | 298.15 | Fe3Tm; _alloy: Tm 0.25_ | model | [1] Kardellass 2014; _cites Konar 2012_ | Table 3, p. 4, row 13; `ORC-ADCPLVYY3L.137aea` |  |
| Entropy; _printed: ΔfS_ | 42.57 J/mol-atom/K | 298.15 | Fe3Tm; _alloy: Tm 0.25_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 14; `ORC-IAH3PPW35K.bd3d91` |  |
| Entropy; _printed: ΔfS_ | 45.03 J/mol-atom/K | 298.15 | Fe3Tm; _alloy: Tm 0.25_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 15; `ORC-RTODDWTW2Z.60c4e6` |  |
| Entropy; _printed: ΔfS_ | 42.72 J/mol-atom/K | 300 | Fe2Tm; _alloy: Tm 0.333333_ | experimental | [1] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 3, p. 4, row 22; `ORC-NUHO6HHWO3.8dcb77` |  |
| Heat capacity; _printed: Cp_ | 27.77 J/mol-atom/K | 290 | Fe2Tm; _alloy: Tm 0.333333_ | experimental | [1] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 3, p. 4, row 21; `ORC-3DFCHE5IR2.11713e` |  |
| Heat capacity; _printed: Cp_ | 29.36 J/mol-atom/K | 298.15 | Fe17Tm2; _alloy: Tm 0.105263_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 5; `ORC-H4NKUXML7D.669e30` |  |
| Heat capacity; _printed: Cp_ | 24.7 J/mol-atom/K | 298.15 | Fe17Tm2; _alloy: Tm 0.105263_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 6; `ORC-KVZPQN4KHH.60972e` |  |
| Heat capacity; _printed: Cp_ | 27.08 J/mol-atom/K | 298.15 | Fe23Tm6; _alloy: Tm 0.206897_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 9; `ORC-FJFK6YCWPH.78a7cc` |  |
| Heat capacity; _printed: Cp_ | 24.96 J/mol-atom/K | 298.15 | Fe23Tm6; _alloy: Tm 0.206897_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 10; `ORC-PV2TBSQX43.0e1a95` |  |
| Heat capacity; _printed: Cp_ | 26.64 J/mol-atom/K | 298.15 | Fe2Tm; _alloy: Tm 0.333333_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 24; `ORC-R3WXFRC5LR.bd106c` |  |
| Heat capacity; _printed: Cp_ | 25.29 J/mol-atom/K | 298.15 | Fe2Tm; _alloy: Tm 0.333333_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 25; `ORC-WPCS2KBO5J.88df97` |  |
| Heat capacity; _printed: Cp_ | 26.09 J/mol-atom/K | 298.15 | Fe3Tm; _alloy: Tm 0.25_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 14; `ORC-IAH3PPW35K.01ae08` |  |
| Heat capacity; _printed: Cp_ | 25.07 J/mol-atom/K | 298.15 | Fe3Tm; _alloy: Tm 0.25_ | model | [1] Kardellass 2014 | Table 3, p. 4, row 15; `ORC-RTODDWTW2Z.531fa1` |  |
| Heat capacity; _printed: Cp_ | 28.07 J/mol-atom/K | 300 | Fe2Tm; _alloy: Tm 0.333333_ | experimental | [1] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 3, p. 4, row 22; `ORC-NUHO6HHWO3.b76be8` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 4.88 J/mol-atom/K | 298.15 | Fe17Tm2; _alloy: Tm 0.105263_ | model | [1] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 12; `ORC-D45F3HMZDK.edcd13` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 4.66 J/mol-atom/K | 298.15 | Fe17Tm2; _alloy: Tm 0.105263_ | model | [1] Kardellass 2014 | Table 9, p. 11, row 11; `ORC-YZ6SXWRMVS.47cf3d` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 2.12 J/mol-atom/K | 298.15 | Fe23Tm6; _alloy: Tm 0.206897_ | model | [1] Kardellass 2014 | Table 9, p. 11, row 13; `ORC-5LVOXXRZEE.ba16da` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 2.07 J/mol-atom/K | 298.15 | Fe23Tm6; _alloy: Tm 0.206897_ | model | [1] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 14; `ORC-IPOZDFKGUU.b3d4dd` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 1.36 J/mol-atom/K | 298.15 | Fe2Tm; _alloy: Tm 0.333333_ | model | [1] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 18; `ORC-HXYWUWZTXW.630f53` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 1.35 J/mol-atom/K | 298.15 | Fe2Tm; _alloy: Tm 0.333333_ | model | [1] Kardellass 2014 | Table 9, p. 11, row 17; `ORC-XWHBMO527K.e07c3e` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 0.97 J/mol-atom/K | 298.15 | Fe3Tm; _alloy: Tm 0.25_ | model | [1] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 16; `ORC-CWGB64NWWM.142750` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 1.02 J/mol-atom/K | 298.15 | Fe3Tm; _alloy: Tm 0.25_ | model | [1] Kardellass 2014 | Table 9, p. 11, row 15; `ORC-UEKBFOMXT5.d10ad5` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -0.89 J/mol-atom/K | 298.15 | Fe17Tm2; _alloy: Tm 0.105263_ | model | [1] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 12; `ORC-D45F3HMZDK.b01e39` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -0.43 J/mol-atom/K | 298.15 | Fe17Tm2; _alloy: Tm 0.105263_ | model | [1] Kardellass 2014 | Table 9, p. 11, row 11; `ORC-YZ6SXWRMVS.a7936e` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -3.23 J/mol-atom/K | 298.15 | Fe23Tm6; _alloy: Tm 0.206897_ | model | [1] Kardellass 2014 | Table 9, p. 11, row 13; `ORC-5LVOXXRZEE.d1c92c` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -3.31 J/mol-atom/K | 298.15 | Fe23Tm6; _alloy: Tm 0.206897_ | model | [1] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 14; `ORC-IPOZDFKGUU.7fa045` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -4.74 J/mol-atom/K | 298.15 | Fe2Tm; _alloy: Tm 0.333333_ | model | [1] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 18; `ORC-HXYWUWZTXW.1a4fe1` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -4.75 J/mol-atom/K | 298.15 | Fe2Tm; _alloy: Tm 0.333333_ | model | [1] Kardellass 2014 | Table 9, p. 11, row 17; `ORC-XWHBMO527K.986a0a` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -2.46 J/mol-atom/K | 298.15 | Fe3Tm; _alloy: Tm 0.25_ | model | [1] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 16; `ORC-CWGB64NWWM.34cbda` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -2.46 J/mol-atom/K | 298.15 | Fe3Tm; _alloy: Tm 0.25_ | model | [1] Kardellass 2014 | Table 9, p. 11, row 15; `ORC-UEKBFOMXT5.6b49a2` |  |

## Sources

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

1. S. Kardellass, C. Servant, N. Selhaoui, A. Iddaoudi, Thermodynamic evaluations of the iron–lutetium and iron–thulium systems, Calphad 46, 42-54 (2014). [doi:10.1016/j.calphad.2014.01.003](https://doi.org/10.1016/j.calphad.2014.01.003)

## 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/).