# Fe–Lu system

> Fe–Lu system: 95 accepted literature values (heat capacity / entropy / enthalpy 43, invariant reaction 40, phase transition 12) 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-LU.html · Markdown: https://data.orchid-project.org/systems/FE-LU.md

95 accepted literature values from 2 paper(s) (experimental 25, model 70); 2 calculated phase diagram(s). 6 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-LU.json) · [CSV](https://data.orchid-project.org/systems/FE-LU.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#FE-LU) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#FE-LU/FeLu-14Kar.json) · [phases (10)](https://data.orchid-project.org/phases/pages/FE-LU.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/FE-LU.html) · [Markdown](https://data.orchid-project.org/systems/FE-LU.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 25 |
| model | 70 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 40 |
| phase transition | 12 |
| heat capacity / entropy / enthalpy | 43 |

## 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 |
|---|---|---|---|
| FeLu-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) | `93d8c09f432863120b933668a6b88f5284b35af70e8011c87272167d12ccbeed` | [viewer](https://orchid-project.org/phase-diagrams/#FE-LU/FeLu-14Kar.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeLu-14Kar.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeLu-14Kar.json) |
| FeLu-23Ye.tdb | H. Ye, M. Rong, Q. Chen, Q. Yao, J. Wang, G. Rao, H. Zhou, J. Mater. Inf., 3, 15(2023). | `2a24b752097da0789fbbc316b37d4c5a218cf946b831720ff21cd1d6c325fec5` | [viewer](https://orchid-project.org/phase-diagrams/#FE-LU/FeLu-23Ye.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeLu-23Ye.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeLu-23Ye.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| FeLu-14Kar.tdb | 1667.47 | BCC_A2 (x(Lu) 0) + FCC_A1 (x(Lu) 0) + LIQUID (x(Lu) 0.0617) |
| FeLu-14Kar.tdb | 1667.47 | FCC_A1 (x(Lu) 0) + BCC_A2 (x(Lu) 0) + LIQUID (x(Lu) 0.06167) |
| FeLu-14Kar.tdb | 1593.22 | FCC_A1 (x(Lu) 0) + FE17LU2_HT (x(Lu) 0.08228) + LIQUID (x(Lu) 0.08976) |
| FeLu-14Kar.tdb | 1593.22 | FCC_A1 (x(Lu) 0) + FE17LU2_HT (x(Lu) 0.08224) + LIQUID (x(Lu) 0.08952) |
| FeLu-14Kar.tdb | 1581.75 | LIQUID (x(Lu) 0.23018) + FE3LU (x(Lu) 0.25) + FE2LU_C15 (x(Lu) 0.33333) |
| FeLu-14Kar.tdb | 1581.75 | LIQUID (x(Lu) 0.22998) + FE3LU (x(Lu) 0.25) + FE2LU_C15 (x(Lu) 0.33333) |
| FeLu-14Kar.tdb | 1581.75 | LIQUID (x(Lu) 0.23024) + FE3LU (x(Lu) 0.25) + FE2LU_C15 (x(Lu) 0.33333) |
| FeLu-14Kar.tdb | 1557.08 | LIQUID (x(Lu) 0.17849) + FE23LU6_D8A (x(Lu) 0.2069) + FE3LU (x(Lu) 0.25) |
| FeLu-14Kar.tdb | 1557.08 | LIQUID (x(Lu) 0.17848) + FE23LU6_D8A (x(Lu) 0.2069) + FE3LU (x(Lu) 0.25) |
| FeLu-14Kar.tdb | 1557.08 | LIQUID (x(Lu) 0.17892) + FE23LU6_D8A (x(Lu) 0.2069) + FE3LU (x(Lu) 0.25) |
| FeLu-14Kar.tdb | 1547.16 | FE17LU2_HT (x(Lu) 0.09124) + LIQUID (x(Lu) 0.1591) + FE23LU6_D8A (x(Lu) 0.2069) |
| FeLu-14Kar.tdb | 1547.16 | FE17LU2_HT (x(Lu) 0.09121) + LIQUID (x(Lu) 0.15883) + FE23LU6_D8A (x(Lu) 0.2069) |
| FeLu-14Kar.tdb | 1237.63 | FE2LU_C15 (x(Lu) 0.33333) + LIQUID (x(Lu) 0.74114) + HCP_A3 (x(Lu) 0.99739) |
| FeLu-14Kar.tdb | 1237.63 | FE2LU_C15 (x(Lu) 0.33333) + LIQUID (x(Lu) 0.74125) + HCP_A3 (x(Lu) 0.99739) |
| FeLu-14Kar.tdb | 1192.32 | FE17LU2_HT (x(Lu) 0.10076) + FE17LU2_LT (x(Lu) 0.10077) + FE23LU6_D8A (x(Lu) 0.2069) |
| FeLu-14Kar.tdb | 1190.62 | FCC_A1 (x(Lu) 0) + FE17LU2_LT (x(Lu) 0.08984) + FE17LU2_HT (x(Lu) 0.08984) |
| FeLu-14Kar.tdb | 1190.62 | FCC_A1 (x(Lu) 0) + FE17LU2_HT (x(Lu) 0.08974) + FE17LU2_LT (x(Lu) 0.08975) |
| FeLu-14Kar.tdb | 1184.81 | BCC_A2 (x(Lu) 0) + FCC_A1 (x(Lu) 0) + FE17LU2_LT (x(Lu) 0.08995) |
| FeLu-14Kar.tdb | 1184.81 | FCC_A1 (x(Lu) 0) + BCC_A2 (x(Lu) 0) + FE17LU2_LT (x(Lu) 0.08995) |
| FeLu-14Kar.tdb | 470.87 | FE17LU2_LT (x(Lu) 0.10526) + FE23LU6_D8A (x(Lu) 0.2069) + FE3LU (x(Lu) 0.25) |
| FeLu-14Kar.tdb | 415.59 | FE17LU2_LT (x(Lu) 0.10526) + FE23LU6_D8A (x(Lu) 0.2069) + FE3LU (x(Lu) 0.25) |
| FeLu-14Kar.tdb | 360.42 | BCC_A2 (x(Lu) 0) + FE17LU2_LT (x(Lu) 0.10526) + FE23LU6_D8A (x(Lu) 0.2069) |
| FeLu-23Ye.tdb | 1667.47 | BCC_A2 (x(Lu) 0) + FCC_A1 (x(Lu) 0) + LIQUID (x(Lu) 0.07031) |
| FeLu-23Ye.tdb | 1667.47 | FCC_A1 (x(Lu) 0) + BCC_A2 (x(Lu) 0) + LIQUID (x(Lu) 0.07016) |
| FeLu-23Ye.tdb | 1590.27 | FCC_A1 (x(Lu) 0) + FE17LU2 (x(Lu) 0.10526) + LIQUID (x(Lu) 0.10546) |
| FeLu-23Ye.tdb | 1590.27 | FCC_A1 (x(Lu) 0) + LIQUID (x(Lu) 0.10506) + FE17LU2 (x(Lu) 0.10526) |
| FeLu-23Ye.tdb | 1590.27 | FCC_A1 (x(Lu) 0) + FE17LU2 (x(Lu) 0.10526) + LIQUID (x(Lu) 0.10535) |
| FeLu-23Ye.tdb | 1580.44 | LIQUID (x(Lu) 0.24206) + FE3LU (x(Lu) 0.25) + FE2LU_C15 (x(Lu) 0.33333) |
| FeLu-23Ye.tdb | 1580.43 | LIQUID (x(Lu) 0.2415) + FE3LU (x(Lu) 0.25) + FE2LU_C15 (x(Lu) 0.33333) |
| FeLu-23Ye.tdb | 1580.43 | LIQUID (x(Lu) 0.24143) + FE3LU (x(Lu) 0.25) + FE2LU_C15 (x(Lu) 0.33333) |
| FeLu-23Ye.tdb | 1560.91 | LIQUID (x(Lu) 0.18823) + FE23LU6_D8A (x(Lu) 0.2069) + FE3LU (x(Lu) 0.25) |
| FeLu-23Ye.tdb | 1560.91 | LIQUID (x(Lu) 0.18829) + FE23LU6_D8A (x(Lu) 0.2069) + FE3LU (x(Lu) 0.25) |
| FeLu-23Ye.tdb | 1559.94 | FE17LU2 (x(Lu) 0.10526) + LIQUID (x(Lu) 0.18382) + FE23LU6_D8A (x(Lu) 0.2069) |
| FeLu-23Ye.tdb | 1559.94 | FE17LU2 (x(Lu) 0.10526) + LIQUID (x(Lu) 0.18377) + FE23LU6_D8A (x(Lu) 0.2069) |
| FeLu-23Ye.tdb | 1240.24 | FE2LU_C15 (x(Lu) 0.33333) + LIQUID (x(Lu) 0.6416) + HCP_A3 (x(Lu) 0.99903) |
| FeLu-23Ye.tdb | 1240.24 | FE2LU_C15 (x(Lu) 0.33333) + LIQUID (x(Lu) 0.6417) + HCP_A3 (x(Lu) 0.99903) |
| FeLu-23Ye.tdb | 1184.81 | FCC_A1 (x(Lu) 0) + BCC_A2 (x(Lu) 0) + FE17LU2 (x(Lu) 0.10526) |

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

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Fe–Lu system (40)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1667.5 | peritectic: L + bcc(δ-Fe) ↔ fcc(γ-Fe) | L: Lu 0.07 | model | [1] Ye 2023 | Table 9, p. 15, row 3; `ORC-S5O5PTXRQY` |  |
| 1667.15 | δFe + Liq -> γFe | δFe: Lu 0; Liq: Lu 0; γFe: Lu 0.087 | experimental | [2] Kardellass 2014; _cites Okamoto 1993_ | Table 6, p. 7, row 4; `ORC-NXA3VOKRX4` |  |
| 1667.15 | δFe + Liq -> γFe | δFe: Lu 0; Liq: Lu 0; γFe: Lu 0.061 | model | [2] Kardellass 2014 | Table 6, p. 7, row 5; `ORC-TKWAJMM5OP` |  |
| 1667 | peritectic: L + bcc(δ-Fe) ↔ fcc(γ-Fe) |  | experimental | [1] Ye 2023; _cites ref. 88_ | Table 9, p. 15, row 1; `ORC-6TZ35L6EKH` |  |
| 1667 | peritectic: L + bcc(δ-Fe) ↔ fcc(γ-Fe) |  | model | [1] Ye 2023; _cites ref. 90_ | Table 9, p. 15, row 2; `ORC-C57TUKYXMU` |  |
| 1602 | peritectic: L + fcc(γ-Fe) ↔ Fe17Lu2 | L: Lu 0.111 | model | [1] Ye 2023; _cites (cal_ | Table 9, p. 15, row 9; `ORC-NDUXAY5GTK` |  |
| 1593.15 | L + γFe -> Fe17Lu2_HT | L: Lu 0.13; γFe: Lu 0; Fe17Lu2_HT: Lu 0.105 | experimental | [2] Kardellass 2014; _cites Okamoto 1993_ | Table 6, p. 7, row 6; `ORC-5J4CM2IZYJ` |  |
| 1593.15 | L + γFe -> Fe17Lu2_HT | L: Lu 0.09; γFe: Lu 0; Fe17Lu2_HT: Lu 0.082 | model | [2] Kardellass 2014 | Table 6, p. 7, row 7; `ORC-ITRY2TECWP` |  |
| 1593 | peritectic: L + fcc(γ-Fe) ↔ Fe17Lu2 | L: Lu 0.09 | model | [1] Ye 2023; _cites ref. 90_ | Table 9, p. 15, row 8; `ORC-AOS2DEE7VH` |  |
| 1593 | peritectic |  | experimental | [1] Ye 2023; _cites ref. 88_ | p. 5; `ORC-FUXHEWSVFK.9c545f` | “There are three peritectic reactions (1,593 K, 1,563 K, and 1,583 K), which are corresponding to the formation of Fe17Lu2, Fe23Lu6, and Fe3Lu, respectively.” |
| 1593 | peritectic: L + fcc(γ-Fe) ↔ Fe17Lu2 | L: Lu 0.13 | experimental | [1] Ye 2023; _cites ref. 88_ | Table 9, p. 15, row 7; `ORC-HXJJZ4EI63` |  |
| 1590.1 | peritectic: L + fcc(γ-Fe) ↔ Fe17Lu2 | L: Lu 0.105 | model | [1] Ye 2023 | Table 9, p. 15, row 10; `ORC-RV7C23N5EG` |  |
| 1583.15 | L + Fe3Lu -> Fe2Lu | L: Lu 0.236; Fe3Lu: Lu 0.25; Fe2Lu: Lu 0.333 | experimental | [2] Kardellass 2014; _cites Okamoto 1993_ | Table 6, p. 7, row 15; `ORC-DDR6MXY3IG` |  |
| 1583 | peritectic: L + Fe2Lu ↔ Fe3Lu | L: Lu 0.225 | experimental | [1] Ye 2023; _cites ref. 88_ | Table 9, p. 15, row 19; `ORC-4EGCYV2SKP` |  |
| 1583 | peritectic |  | experimental | [1] Ye 2023; _cites ref. 88_ | p. 5; `ORC-FUXHEWSVFK.0da34d` | “There are three peritectic reactions (1,593 K, 1,563 K, and 1,583 K), which are corresponding to the formation of Fe17Lu2, Fe23Lu6, and Fe3Lu, respectively.” |
| 1581.15 | L + Fe3Lu -> Fe2Lu | L: Lu 0.229; Fe3Lu: Lu 0.25; Fe2Lu: Lu 0.333 | model | [2] Kardellass 2014 | Table 6, p. 7, row 16; `ORC-WAY252CVLM` |  |
| 1581 | peritectic: L + Fe2Lu ↔ Fe3Lu | L: Lu 0.229 | model | [1] Ye 2023; _cites ref. 90_ | Table 9, p. 15, row 20; `ORC-VSWD4HX5LL` |  |
| 1580.4 | peritectic: L + Fe2Lu ↔ Fe3Lu | L: Lu 0.241 | model | [1] Ye 2023 | Table 9, p. 15, row 22; `ORC-RPA2VOOYNW` |  |
| 1580 | peritectic: L + Fe2Lu ↔ Fe3Lu | L: Lu 0.333 | model | [1] Ye 2023; _cites (cal_ | Table 9, p. 15, row 21; `ORC-5EBSY4P7DT` |  |
| 1563.15 | L + Fe3Lu -> Fe23Lu6 | L: Lu 0.2; Fe3Lu: Lu 0.25; Fe23Lu6: Lu 0.206 | experimental | [2] Kardellass 2014; _cites Okamoto 1993_ | Table 6, p. 7, row 13; `ORC-52X2V3A5WE` |  |
| 1563 | peritectic |  | experimental | [1] Ye 2023; _cites ref. 88_ | p. 5; `ORC-FUXHEWSVFK.3ae50f` | “There are three peritectic reactions (1,593 K, 1,563 K, and 1,583 K), which are corresponding to the formation of Fe17Lu2, Fe23Lu6, and Fe3Lu, respectively.” |
| 1563 | peritectic: L + Fe3Lu ↔ Fe23Lu6 | L: Lu 0.196 | experimental | [1] Ye 2023; _cites ref. 88_ | Table 9, p. 15, row 15; `ORC-NTTN54KVN5` |  |
| 1560.9 | peritectic: L + Fe3Lu ↔ Fe23Lu6 | L: Lu 0.188 | model | [1] Ye 2023 | Table 9, p. 15, row 18; `ORC-ZG6GJDIHL2` |  |
| 1560.15 | L + Fe3Lu -> Fe23Lu6 | L: Lu 0.183; Fe3Lu: Lu 0.25; Fe23Lu6: Lu 0.206 | model | [2] Kardellass 2014 | Table 6, p. 7, row 14; `ORC-4G3X4OR7FY` |  |
| 1560 | peritectic: L + Fe3Lu ↔ Fe23Lu6 | L: Lu 0.183 | model | [1] Ye 2023; _cites ref. 90_ | Table 9, p. 15, row 16; `ORC-B3BRAF4TXE` |  |
| 1560 | peritectic: L + Fe3Lu ↔ Fe23Lu6 | L: Lu 0.202 | model | [1] Ye 2023; _cites (cal_ | Table 9, p. 15, row 17; `ORC-JL3NSSRYNQ` |  |
| 1559.9 | eutectic: L ↔ Fe17Lu2 + Fe23Lu6 | L: Lu 0.184 | model | [1] Ye 2023 | Table 9, p. 15, row 14; `ORC-7C7F3XFJXE` |  |
| 1549.15 | eutectic: L -> Fe17Lu2_HT + Fe23Lu6 | L: Lu 0.158; Fe17Lu2_HT: Lu 0.105; Fe23Lu6: Lu 0.206 | model | [2] Kardellass 2014 | Table 6, p. 7, row 12; `ORC-CWMEX6VPY2` |  |
| 1549 | eutectic: L ↔ Fe17Lu2 + Fe23Lu6 | L: Lu 0.158 | model | [1] Ye 2023; _cites ref. 90_ | Table 9, p. 15, row 12; `ORC-V64FEFKEZE` |  |
| 1548 | eutectic: L ↔ Fe17Lu2 + Fe23Lu6 | L: Lu 0.18 | experimental | [1] Ye 2023; _cites ref. 88_ | Table 9, p. 15, row 11; `ORC-RYXTRYGWXT` |  |
| 1546 | eutectic: L ↔ Fe17Lu2 + Fe23Lu6 | L: Lu 0.172 | model | [1] Ye 2023; _cites (cal_ | Table 9, p. 15, row 13; `ORC-D3A7YRW5Z6` |  |
| 1249 | eutectic: L ↔ Fe2Lu + hcp-Lu | L: Lu 0.67 | model | [1] Ye 2023; _cites (cal_ | Table 9, p. 15, row 29; `ORC-RDAO5BDLLO` |  |
| 1243.15 | eutectic: L -> Fe2Lu + (Lu) | L: Lu 0.75; Fe2Lu: Lu 0.333; (Lu): Lu 1 | experimental | [2] Kardellass 2014; _cites Okamoto 1993_ | Table 6, p. 7, row 19; `ORC-H7OUOPBE7B` |  |
| 1243 | eutectic: L ↔ Fe2Lu + hcp-Lu | L: Lu 0.75 | experimental | [1] Ye 2023; _cites ref. 88_ | Table 9, p. 15, row 27; `ORC-TJEZVMG765` |  |
| 1240.3 | eutectic: L ↔ Fe2Lu + hcp-Lu | L: Lu 0.642 | model | [1] Ye 2023 | Table 9, p. 15, row 30; `ORC-INQMGTMNIG` |  |
| 1237.15 | eutectic: L -> Fe2Lu + (Lu) | L: Lu 0.741; Fe2Lu: Lu 0.333; (Lu): Lu 1 | model | [2] Kardellass 2014 | Table 6, p. 7, row 20; `ORC-6FFBECRJ4Y` |  |
| 1237 | eutectic: L ↔ Fe2Lu + hcp-Lu | L: Lu 0.741 | model | [1] Ye 2023; _cites ref. 90_ | Table 9, p. 15, row 28; `ORC-KYEKR6SE6N` |  |
| 1185 | peritectoid: Fe17Lu2 + fcc(γ-Fe) ↔ bcc(α-Fe) |  | model | [1] Ye 2023; _cites ref. 90_ | Table 9, p. 15, row 5; `ORC-6EMK4475OT` |  |
| 1185 | peritectoid: Fe17Lu2 + fcc(γ-Fe) ↔ bcc(α-Fe) |  | experimental | [1] Ye 2023; _cites ref. 88_ | Table 9, p. 15, row 4; `ORC-CQC5TLMEVA` |  |
| 1184.8 | peritectoid: Fe17Lu2 + fcc(γ-Fe) ↔ bcc(α-Fe) |  | model | [1] Ye 2023 | Table 9, p. 15, row 6; `ORC-LD65QQIOFK` |  |

## Other properties

### Phase transition (12)

Table: Phase transition, Fe–Lu system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1188.15 K | 1188.15 | αFe17Lu2_HT -> Fe17Lu2_LT; _αFe17Lu2_HT: Lu 0.105; Fe17Lu2_LT: Lu 0.105_ | experimental | [2] Kardellass 2014; _cites Kolesnichenko 1972_ | Table 6, p. 7, row 26; `ORC-3KV5VYF2LF` |  |
| Phase transition | 1188.15 K | 1188.15 | αFe17Lu2_HT -> Fe17Lu2_LT; _αFe17Lu2_HT: Lu 0.105; Fe17Lu2_LT: Lu 0.105_ | model | [2] Kardellass 2014 | Table 6, p. 7, row 27; `ORC-IXYYTVUEPG` |  |
| Phase transition | 1618 K | 1618 | congruent melting: L ↔ Fe2Lu; _L: Lu 0.333_ | experimental | [1] Ye 2023; _cites ref. 88_ | Table 9, p. 15, row 23; `ORC-BOEUPCJKUW` |  |
| Phase transition | 1618 K | 1618 | congruent melting: L ↔ Fe2Lu; _L: Lu 0.333_ | model | [1] Ye 2023; _cites ref. 90_ | Table 9, p. 15, row 24; `ORC-ILG3FF5V4E` |  |
| Phase transition | 1618 K | 1618 | congruent transformation | experimental | [1] Ye 2023 | p. 5; `ORC-ZUZW5WIL4B` | “The congruent reaction at 1,618 K is corresponding to the formation of Fe2Lu.” |
| Phase transition | 1618.15 K | 1618.15 | L -> Fe2Lu; _L: Lu 0.333; Fe2Lu: Lu 0.333_ | experimental | [2] Kardellass 2014; _cites Okamoto 1993_ | Table 6, p. 7, row 17; `ORC-6QX4IUQXAM` |  |
| Phase transition | 1618.15 K | 1618.15 | L -> Fe2Lu; _L: Lu 0.333; Fe2Lu: Lu 0.333_ | model | [2] Kardellass 2014 | Table 6, p. 7, row 18; `ORC-7TJY6QBJD7` |  |
| Phase transition | 1619.6 K | 1619.6 | congruent melting: L ↔ Fe2Lu; _L: Lu 0.333_ | model | [1] Ye 2023 | Table 9, p. 15, row 26; `ORC-KKRMWIG3PS` |  |
| Phase transition | 1620 K | 1620 | congruent melting: L ↔ Fe2Lu; _L: Lu 0.333_ | model | [1] Ye 2023; _cites (cal_ | Table 9, p. 15, row 25; `ORC-FSJHYFP4HH` |  |
| Phase transition | 1809.15 K | 1809.15 | δFe -> Liq; _δFe: Lu 0_ | experimental | [2] Kardellass 2014; _cites Kubaschewski 1982_ | Table 6, p. 7, row 2; `ORC-FQFUIKIFFT` |  |
| Phase transition | 1811.15 K | 1811.15 | δFe -> Liq; _δFe: Lu 0_ | model | [2] Kardellass 2014 | Table 6, p. 7, row 3; `ORC-FVW6SG352I` |  |
| Phase transition | 1811.15 K | 1811.15 | δFe -> Liq; _δFe: Lu 0; Liq: Lu 0_ | experimental | [2] Kardellass 2014; _cites Okamoto 1993_ | Table 6, p. 7, row 1; `ORC-KVESXYCHII` |  |

### Heat capacity / entropy / enthalpy (43)

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

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy; _printed: ΔfS_ | 34.56 J/mol-atom/K | 290 | Fe2Lu; _alloy: Lu 0.333333_ | experimental | [2] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 2, p. 3, row 23; `ORC-PIU2NHVH32.892683` |  |
| Entropy; _printed: ΔfS_ | 35.42 J/mol-atom/K | 298.15 | Fe17Lu2_HT; _alloy: Lu 0.105263_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 1; `ORC-GBFNFA47X7.410157` |  |
| Entropy; _printed: ΔfS_ | 34.05 J/mol-atom/K | 298.15 | Fe17Lu2_LT; _alloy: Lu 0.105263_ | model | [2] Kardellass 2014; _cites Konar 2012_ | Table 2, p. 3, row 5; `ORC-4APB7GXYAX` |  |
| Entropy; _printed: ΔfS (experimental, ▼)_ | 34.1 J/mol-atom/K | 298.15 | Fe17Lu2_LT; _alloy: Lu 0.105263_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 6; `ORC-HFOONYJIGP` |  |
| Entropy; _printed: ΔfS_ | 35.37 J/mol-atom/K | 298.15 | Fe17Lu2_LT; _alloy: Fe 0.894737, Lu 0.105263_ | model | [2] Kardellass 2014; _cites Kardellass 2013_ | Table 2, p. 3, row 8; `ORC-SSP46CIQBW.ced270` |  |
| Entropy; _printed: ΔfS_ | 34.48 J/mol-atom/K | 298.15 | Fe17Lu2_LT; _alloy: Lu 0.105263_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 7; `ORC-ZOETWXEEKG.099e02` |  |
| Entropy; _printed: ΔfS_ | 38.37 J/mol-atom/K | 298.15 | Fe23Lu6; _alloy: Fe 0.793103, Lu 0.206897_ | model | [2] Kardellass 2014; _cites De 1988_ | Table 2, p. 3, row 12; `ORC-54KDB6NZV3.597fce` |  |
| Entropy; _printed: ΔfS_ | 35.64 J/mol-atom/K | 298.15 | Fe23Lu6; _alloy: Lu 0.206897_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 10; `ORC-FPALSGOEWX` |  |
| Entropy; _printed: ΔfS_ | 32 J/mol-atom/K | 298.15 | Fe23Lu6; _alloy: Lu 0.206897_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 11; `ORC-X4Y3HUAILV.25e06e` |  |
| Entropy; _printed: ΔfS_ | 41.42 J/mol-atom/K | 298.15 | Fe2Lu; _alloy: Lu 0.333333_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 29; `ORC-3NQELUVIJF` |  |
| Entropy; _printed: ΔfS_ | 36 J/mol-atom/K | 298.15 | Fe2Lu; _alloy: Lu 0.333333_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 26; `ORC-BSC7WEY2LT` |  |
| Entropy; _printed: ΔfS_ | 36.25 J/mol-atom/K | 298.15 | Fe2Lu; _alloy: Lu 0.333333_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 28; `ORC-VE2CAFPYOA` |  |
| Entropy; _printed: ΔfS (experimental, ▼)_ | 35.8 J/mol-atom/K | 298.15 | Fe2Lu; _alloy: Lu 0.333333_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 27; `ORC-WOMYAWLDVW` |  |
| Entropy; _printed: ΔfS_ | 39.49 J/mol-atom/K | 298.15 | Fe3Lu; _alloy: Fe 0.75, Lu 0.25_ | model | [2] Kardellass 2014; _cites De 1988_ | Table 2, p. 3, row 17; `ORC-CT4RZK4MZO.e5f433` |  |
| Entropy; _printed: ΔfS_ | 37.02 J/mol-atom/K | 298.15 | Fe3Lu; _alloy: Lu 0.25_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 15; `ORC-QCKOEV6L3R` |  |
| Entropy; _printed: ΔfS_ | 33.1 J/mol-atom/K | 298.15 | Fe3Lu; _alloy: Lu 0.25_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 16; `ORC-Z3HXBTGR6M.0ac721` |  |
| Entropy; _printed: ΔfS_ | 35.48 J/mol-atom/K | 300 | Fe2Lu; _alloy: Lu 0.333333_ | experimental | [2] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 2, p. 3, row 24; `ORC-6RGAKANZZY.e2bf9c` |  |
| Entropy; _printed: ΔfS_ | 35.3 J/mol-atom/K | 300 | Fe2Lu; _alloy: Lu 0.333333_ | model | [2] Kardellass 2014; _cites Gozzi 2007_ [doi](https://doi.org/10.1021/je7003353) | Table 2, p. 3, row 19; `ORC-Y5FUECSBPA` |  |
| Heat capacity; _printed: Cp_ | 26.94 J/mol-atom/K | 290 | Fe2Lu; _alloy: Lu 0.333333_ | experimental | [2] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 2, p. 3, row 23; `ORC-PIU2NHVH32.18f6d2` |  |
| Heat capacity; _printed: Cp_ | 24.67 J/mol-atom/K | 298.15 | Fe17Lu2_HT; _alloy: Lu 0.105263_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 1; `ORC-GBFNFA47X7.bfb394` |  |
| Heat capacity; _printed: Cp_ | 26.67 J/mol-atom/K | 298.15 | Fe17Lu2_LT; _alloy: Fe 0.894737, Lu 0.105263_ | model | [2] Kardellass 2014; _cites Kardellass 2013_ | Table 2, p. 3, row 8; `ORC-SSP46CIQBW.afdad3` |  |
| Heat capacity; _printed: Cp_ | 29.56 J/mol-atom/K | 298.15 | Fe17Lu2_LT; _alloy: Lu 0.105263_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 7; `ORC-ZOETWXEEKG.bc6dff` |  |
| Heat capacity; _printed: Cp_ | 24.91 J/mol-atom/K | 298.15 | Fe23Lu6; _alloy: Fe 0.793103, Lu 0.206897_ | model | [2] Kardellass 2014; _cites De 1988_ | Table 2, p. 3, row 12; `ORC-54KDB6NZV3.4d06f9` |  |
| Heat capacity; _printed: Cp_ | 28.8 J/mol-atom/K | 298.15 | Fe23Lu6; _alloy: Lu 0.206897_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 11; `ORC-X4Y3HUAILV.ef1664` |  |
| Heat capacity; _printed: Cp_ | 25.01 J/mol-atom/K | 298.15 | Fe3Lu; _alloy: Fe 0.75, Lu 0.25_ | model | [2] Kardellass 2014; _cites De 1988_ | Table 2, p. 3, row 17; `ORC-CT4RZK4MZO.707377` |  |
| Heat capacity; _printed: Cp_ | 27.77 J/mol-atom/K | 298.15 | Fe3Lu; _alloy: Lu 0.25_ | model | [2] Kardellass 2014 | Table 2, p. 3, row 16; `ORC-Z3HXBTGR6M.458f1a` |  |
| Heat capacity; _printed: Cp_ | 27.77 J/mol-atom/K | 300 | Fe2Lu; _alloy: Lu 0.333333_ | experimental | [2] Kardellass 2014; _cites Germano 1981_ [doi](https://doi.org/10.1103/physrevb.24.3912) | Table 2, p. 3, row 24; `ORC-6RGAKANZZY.b63bed` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 4.34 J/mol-atom/K | 298.15 | Fe17Lu2_LT; _alloy: Lu 0.105263_ | model | [2] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 4; `ORC-BYJ7OMFRPQ.d5353a` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 4.88 J/mol-atom/K | 298.15 | Fe17Lu2_LT; _alloy: Lu 0.105263_ | model | [2] Kardellass 2014 | Table 9, p. 11, row 3; `ORC-BZ7ODOHROB.b8d27f` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 3.89 J/mol-atom/K | 298.15 | Fe23Lu6; _alloy: Lu 0.206897_ | model | [2] Kardellass 2014 | Table 9, p. 11, row 5; `ORC-7EXTDYNWMH.b361db` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 3.88 J/mol-atom/K | 298.15 | Fe23Lu6; _alloy: Lu 0.206897_ | model | [2] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 6; `ORC-VQALAQNX6Y.06da2e` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 1.49 J/mol-atom/K | 298.15 | Fe2Lu; _alloy: Lu 0.333333_ | model | [2] Kardellass 2014 | Table 9, p. 11, row 9; `ORC-5JUPTV6675.acb41d` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 1.488 J/mol-atom/K | 298.15 | Fe2Lu; _alloy: Lu 0.333333_ | model | [2] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 10; `ORC-LCM52ZQ3Q4.525b71` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 2.77 J/mol-atom/K | 298.15 | Fe3Lu; _alloy: Lu 0.25_ | model | [2] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 8; `ORC-V4EQBGVLFB.fd40b9` |  |
| cpm contribution; _printed: 0C298.15 p mag_ | 2.76 J/mol-atom/K | 298.15 | Fe3Lu; _alloy: Lu 0.25_ | model | [2] Kardellass 2014 | Table 9, p. 11, row 7; `ORC-YILKSYL53A.0b2e52` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -0.868 J/mol-atom/K | 298.15 | Fe17Lu2_LT; _alloy: Lu 0.105263_ | model | [2] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 4; `ORC-BYJ7OMFRPQ.45331e` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -0.89 J/mol-atom/K | 298.15 | Fe17Lu2_LT; _alloy: Lu 0.105263_ | model | [2] Kardellass 2014 | Table 9, p. 11, row 3; `ORC-BZ7ODOHROB.521d74` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -6.37 J/mol-atom/K | 298.15 | Fe23Lu6; _alloy: Lu 0.206897_ | model | [2] Kardellass 2014 | Table 9, p. 11, row 5; `ORC-7EXTDYNWMH.faf8e4` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -6.37 J/mol-atom/K | 298.15 | Fe23Lu6; _alloy: Lu 0.206897_ | model | [2] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 6; `ORC-VQALAQNX6Y.634502` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -5.17 J/mol-atom/K | 298.15 | Fe2Lu; _alloy: Lu 0.333333_ | model | [2] Kardellass 2014 | Table 9, p. 11, row 9; `ORC-5JUPTV6675.a36fca` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -5.15 J/mol-atom/K | 298.15 | Fe2Lu; _alloy: Lu 0.333333_ | model | [2] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 10; `ORC-LCM52ZQ3Q4.784b14` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -6.34 J/mol-atom/K | 298.15 | Fe3Lu; _alloy: Lu 0.25_ | model | [2] Kardellass 2014; _cites Dinsdale 1991_ [doi](https://doi.org/10.1016/0364-5916%2891%2990030-n) | Table 9, p. 11, row 8; `ORC-V4EQBGVLFB.f0fe01` |  |
| sm magnetic; _printed: 0S298.15 mag_ | -6.4 J/mol-atom/K | 298.15 | Fe3Lu; _alloy: Lu 0.25_ | model | [2] Kardellass 2014 | Table 9, p. 11, row 7; `ORC-YILKSYL53A.1267f8` |  |

## Sources

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

1. Hongjian Ye, Maohua Rong, Qing Chen, Qingrong Yao, Jiang Wang, Guanghui Rao et al., Assessment of phase equilibria and thermodynamic properties in the Fe-RE (RE = rare earth metals) binary systems, J Mater Inf 3 (2023). [doi:10.20517/jmi.2023.08](https://doi.org/10.20517/jmi.2023.08)
2. 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/).