# Er–Fe system

> Er–Fe system: 117 accepted literature values (invariant reaction 79, mixing / partial 18, phase transition 14, formation 6) and 4 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

117 accepted literature values from 4 paper(s) (experimental 39, model 77, unspecified 1); 4 calculated phase diagram(s). 8 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/ER-FE.json) · [CSV](https://data.orchid-project.org/systems/ER-FE.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#ER-FE) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#ER-FE/ErFe-10Zho.json) · [phases (8)](https://data.orchid-project.org/phases/pages/ER-FE.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/ER-FE.html) · [Markdown](https://data.orchid-project.org/systems/ER-FE.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 39 |
| model | 77 |
| unspecified | 1 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 79 |
| phase transition | 14 |
| formation | 6 |
| mixing / partial | 18 |

## 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 |
|---|---|---|---|
| ErFe-10Zho.tdb | G.J. Zhou, Z.W. Liu, D.C. Zeng, Z.P. Jin, Physica B, 405, 3590-93(2010). [doi:10.1016/j.physb.2010.05.046](https://doi.org/10.1016/j.physb.2010.05.046) | `1040d981d623df87d259303a659860caded5369ac3b846b25f0865fedbb0a14a` | [viewer](https://orchid-project.org/phase-diagrams/#ER-FE/ErFe-10Zho.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/ErFe-10Zho.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/ErFe-10Zho.json) |
| ErFe-11Wan.tdb | W. Wang, C. Guo, C. Li, Z. Du, Calphad, 35, 292-301(2011). [doi:10.1016/j.calphad.2011.04.001](https://doi.org/10.1016/j.calphad.2011.04.001) | `d3d26033abb0e6a68578eab4085937cbd7904c2d98acee85e6633bef09c27ffc` | [viewer](https://orchid-project.org/phase-diagrams/#ER-FE/ErFe-11Wan.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/ErFe-11Wan.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/ErFe-11Wan.json) |
| ErFe-12Wan.tdb | S.L. Wang, J.J. Han, C.P. Wang, S.Z. Kou, X.J. Liu, J. Alloys Compd., 513, 27-34(2012). [doi:10.1016/j.jallcom.2011.08.014](https://doi.org/10.1016/j.jallcom.2011.08.014) | `9284f49a27f3fe26cd4e9cbfb85e35a2c84d72032ddb6dc08d5a7fccf8cfa84d` | [viewer](https://orchid-project.org/phase-diagrams/#ER-FE/ErFe-12Wan.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/ErFe-12Wan.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/ErFe-12Wan.json) |
| ErFe-23Ye.tdb | H. Ye, M. Rong, Q. Chen, Q. Yao, J. Wang, G. Rao, H. Zhou, J. Mater. Inf., 3, 15(2023). | `d3f1e827a3153e9e4b23f5d6860e96cefd672743cc8668bb4c795e562eaab861` | [viewer](https://orchid-project.org/phase-diagrams/#ER-FE/ErFe-23Ye.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/ErFe-23Ye.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/ErFe-23Ye.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| ErFe-10Zho.tdb | 1665.85 | LIQUID (x(Fe) 0.91793) + BCC_A2 (x(Fe) 0.99994) + FCC_A1 (x(Fe) 1) |
| ErFe-10Zho.tdb | 1665.85 | LIQUID (x(Fe) 0.91797) + BCC_A2 (x(Fe) 0.99994) + FCC_A1 (x(Fe) 1) |
| ErFe-10Zho.tdb | 1614.23 | LIQUID (x(Fe) 0.88338) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 1) |
| ErFe-10Zho.tdb | 1614.23 | LIQUID (x(Fe) 0.8834) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 1) |
| ErFe-10Zho.tdb | 1614.22 | LIQUID (x(Fe) 0.88286) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 1) |
| ErFe-10Zho.tdb | 1614.22 | LIQUID (x(Fe) 0.88294) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 1) |
| ErFe-10Zho.tdb | 1610.63 | ERFE2_C15 (x(Fe) 0.66667) + ERFE3 (x(Fe) 0.75) + LIQUID (x(Fe) 0.75988) |
| ErFe-10Zho.tdb | 1610.63 | ERFE2_C15 (x(Fe) 0.66667) + ERFE3 (x(Fe) 0.75) + LIQUID (x(Fe) 0.76038) |
| ErFe-10Zho.tdb | 1610.63 | ERFE2_C15 (x(Fe) 0.66667) + ERFE3 (x(Fe) 0.75) + LIQUID (x(Fe) 0.75987) |
| ErFe-10Zho.tdb | 1610.63 | ERFE2_C15 (x(Fe) 0.66667) + ERFE3 (x(Fe) 0.75) + LIQUID (x(Fe) 0.75985) |
| ErFe-10Zho.tdb | 1601.41 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.80947) |
| ErFe-10Zho.tdb | 1601.41 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.80948) |
| ErFe-10Zho.tdb | 1601.41 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.80904) |
| ErFe-10Zho.tdb | 1601.41 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.8095) |
| ErFe-10Zho.tdb | 1601.41 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.80903) |
| ErFe-10Zho.tdb | 1599.07 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.82639) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-10Zho.tdb | 1599.07 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.82551) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-10Zho.tdb | 1599.07 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.82551) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-10Zho.tdb | 1599.06 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.82592) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-10Zho.tdb | 1184.82 | ER2FE17 (x(Fe) 0.89474) + BCC_A2 (x(Fe) 1) + FCC_A1 (x(Fe) 1) |
| ErFe-10Zho.tdb | 1184.44 | HCP_A3 (x(Fe) 1.000e-5) + LIQUID (x(Fe) 0.30801) + ERFE2_C15 (x(Fe) 0.66667) |
| ErFe-10Zho.tdb | 1184.44 | HCP_A3 (x(Fe) 1.000e-5) + LIQUID (x(Fe) 0.308) + ERFE2_C15 (x(Fe) 0.66667) |
| ErFe-11Wan.tdb | 1658 | LIQUID (x(Fe) 0.9179) + BCC_A2 (x(Fe) 0.99966) + FCC_A1 (x(Fe) 1) |
| ErFe-11Wan.tdb | 1658 | LIQUID (x(Fe) 0.91795) + BCC_A2 (x(Fe) 0.99966) + FCC_A1 (x(Fe) 1) |
| ErFe-11Wan.tdb | 1619.21 | ER2FE17 (x(Fe) 0.89474) + LIQUID (x(Fe) 0.89517) + FCC_A1 (x(Fe) 1) |
| ErFe-11Wan.tdb | 1619.2 | LIQUID (x(Fe) 0.8947) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 1) |
| ErFe-11Wan.tdb | 1619.2 | LIQUID (x(Fe) 0.89458) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 1) |
| ErFe-11Wan.tdb | 1611.01 | ERFE2_C15 (x(Fe) 0.66667) + ERFE3 (x(Fe) 0.75) + LIQUID (x(Fe) 0.76457) |
| ErFe-11Wan.tdb | 1611.01 | ERFE2_C15 (x(Fe) 0.66667) + ERFE3 (x(Fe) 0.75) + LIQUID (x(Fe) 0.76493) |
| ErFe-11Wan.tdb | 1611.01 | ERFE2_C15 (x(Fe) 0.66667) + ERFE3 (x(Fe) 0.75) + LIQUID (x(Fe) 0.76402) |
| ErFe-11Wan.tdb | 1600.37 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.81765) |
| ErFe-11Wan.tdb | 1600.24 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.81864) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-11Wan.tdb | 1188.27 | HCP_A3 (x(Fe) 0) + LIQUID (x(Fe) 0.28055) + ERFE2_C15 (x(Fe) 0.66667) |
| ErFe-11Wan.tdb | 1188.27 | HCP_A3 (x(Fe) 0) + LIQUID (x(Fe) 0.28054) + ERFE2_C15 (x(Fe) 0.66667) |
| ErFe-11Wan.tdb | 1184.84 | ER2FE17 (x(Fe) 0.89474) + BCC_A2 (x(Fe) 1) + FCC_A1 (x(Fe) 1) |
| ErFe-12Wan.tdb | 1658.14 | LIQUID (x(Fe) 0.91058) + BCC_A2 (x(Fe) 0.98333) + FCC_A1 (x(Fe) 0.98377) |
| ErFe-12Wan.tdb | 1625.28 | LIQUID (x(Fe) 0.89144) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 0.98085) |
| ErFe-12Wan.tdb | 1625.28 | LIQUID (x(Fe) 0.89148) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 0.98086) |
| ErFe-12Wan.tdb | 1616.08 | ERFE2_C15 (x(Fe) 0.66667) + ERFE3 (x(Fe) 0.75) + LIQUID (x(Fe) 0.75005) |
| ErFe-12Wan.tdb | 1616.08 | ERFE2_C15 (x(Fe) 0.66667) + LIQUID (x(Fe) 0.74942) + ERFE3 (x(Fe) 0.75) |
| ErFe-12Wan.tdb | 1616.08 | ERFE2_C15 (x(Fe) 0.66667) + LIQUID (x(Fe) 0.74938) + ERFE3 (x(Fe) 0.75) |
| ErFe-12Wan.tdb | 1616.07 | ERFE2_C15 (x(Fe) 0.66667) + LIQUID (x(Fe) 0.74977) + ERFE3 (x(Fe) 0.75) |
| ErFe-12Wan.tdb | 1603.53 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.80935) |
| ErFe-12Wan.tdb | 1603.53 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.80849) |
| ErFe-12Wan.tdb | 1603.53 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.80934) |
| ErFe-12Wan.tdb | 1603.53 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.80848) |
| ErFe-12Wan.tdb | 1603.52 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.80898) |
| ErFe-12Wan.tdb | 1600.86 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.82338) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-12Wan.tdb | 1600.86 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.82332) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-12Wan.tdb | 1600.86 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.82392) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-12Wan.tdb | 1600.86 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.82393) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-12Wan.tdb | 1189.08 | HCP_A3 (x(Fe) 0.00228) + LIQUID (x(Fe) 0.31228) + ERFE2_C15 (x(Fe) 0.66667) |
| ErFe-12Wan.tdb | 1189.08 | HCP_A3 (x(Fe) 0.00229) + LIQUID (x(Fe) 0.31225) + ERFE2_C15 (x(Fe) 0.66667) |
| ErFe-12Wan.tdb | 1182.93 | ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 0.99922) + BCC_A2 (x(Fe) 0.99939) |
| ErFe-12Wan.tdb | 1182.93 | ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 0.99923) + BCC_A2 (x(Fe) 0.9994) |
| ErFe-12Wan.tdb | 587.78 | ERFE2_C15 (x(Fe) 0.66667) + ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) |
| ErFe-12Wan.tdb | 462.23 | ER6FE23_D8A (x(Fe) 0.7931) + ER2FE17 (x(Fe) 0.89474) + BCC_A2 (x(Fe) 1) |
| ErFe-23Ye.tdb | 1661.49 | LIQUID (x(Fe) 0.91555) + BCC_A2 (x(Fe) 0.99979) + FCC_A1 (x(Fe) 1) |
| ErFe-23Ye.tdb | 1661.49 | LIQUID (x(Fe) 0.91566) + BCC_A2 (x(Fe) 0.99979) + FCC_A1 (x(Fe) 1) |
| ErFe-23Ye.tdb | 1625.17 | LIQUID (x(Fe) 0.89366) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 1) |
| ErFe-23Ye.tdb | 1625.17 | LIQUID (x(Fe) 0.8935) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 1) |
| ErFe-23Ye.tdb | 1625.17 | LIQUID (x(Fe) 0.89413) + ER2FE17 (x(Fe) 0.89474) + FCC_A1 (x(Fe) 1) |
| ErFe-23Ye.tdb | 1615.02 | ERFE2_C15 (x(Fe) 0.66667) + LIQUID (x(Fe) 0.74951) + ERFE3 (x(Fe) 0.75) |
| ErFe-23Ye.tdb | 1615.02 | ERFE2_C15 (x(Fe) 0.66667) + LIQUID (x(Fe) 0.74973) + ERFE3 (x(Fe) 0.75) |
| ErFe-23Ye.tdb | 1615.02 | ERFE2_C15 (x(Fe) 0.66667) + LIQUID (x(Fe) 0.74925) + ERFE3 (x(Fe) 0.75) |
| ErFe-23Ye.tdb | 1615.02 | ERFE2_C15 (x(Fe) 0.66667) + LIQUID (x(Fe) 0.74924) + ERFE3 (x(Fe) 0.75) |
| ErFe-23Ye.tdb | 1602.73 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.81133) |
| ErFe-23Ye.tdb | 1602.73 | ERFE3 (x(Fe) 0.75) + ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.81109) |
| ErFe-23Ye.tdb | 1601.82 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.81766) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-23Ye.tdb | 1601.82 | ER6FE23_D8A (x(Fe) 0.7931) + LIQUID (x(Fe) 0.81791) + ER2FE17 (x(Fe) 0.89474) |
| ErFe-23Ye.tdb | 1185.54 | HCP_A3 (x(Fe) 4.000e-5) + LIQUID (x(Fe) 0.33143) + ERFE2_C15 (x(Fe) 0.66667) |
| ErFe-23Ye.tdb | 1185.54 | HCP_A3 (x(Fe) 4.000e-5) + LIQUID (x(Fe) 0.33142) + ERFE2_C15 (x(Fe) 0.66667) |
| ErFe-23Ye.tdb | 1184.83 | ER2FE17 (x(Fe) 0.89474) + BCC_A2 (x(Fe) 1) + FCC_A1 (x(Fe) 1) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/ER/ER-FE.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/ER/ER-FE.json) · [CALPHAD hull ErFe-10Zho](https://data.orchid-project.org/hulls/calphad-sgte/ER/ER-FE--ErFe-10Zho.json) · [CALPHAD hull ErFe-11Wan](https://data.orchid-project.org/hulls/calphad-sgte/ER/ER-FE--ErFe-11Wan.json) · [CALPHAD hull ErFe-12Wan](https://data.orchid-project.org/hulls/calphad-sgte/ER/ER-FE--ErFe-12Wan.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Er–Fe system (79)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1667.5 | metatectic/catatectic: bcc(δ-Fe) -> fcc(γ-Fe) + L | L: Fe 0.919 | model | [1] Ye 2023; _cites ref. 110_ | Table 8, p. 14, row 2; `ORC-JWGDYCA63T` |  |
| 1661.5 | metatectic/catatectic: bcc(δ-Fe) -> fcc(γ-Fe) + L | L: Fe 0.916 | model | [1] Ye 2023 | Table 8, p. 14, row 5; `ORC-FJR6B5UWXZ` |  |
| 1658.15 | eutectoid: (δFe) ↔ (γFe) + L |  | experimental | [2] Wang 2012; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 2, p. 3, row 1; `ORC-JVS5J63Q3O` |  |
| 1658.15 | eutectoid: (δFe) ↔ (γFe) + L | (δFe): Er 0.0167; (γFe): Er 0.0163; L: Er 0.0895 | model | [2] Wang 2012 | Table 2, p. 3, row 2; `ORC-ZWKKLYDOFO` |  |
| 1658 | bcc -> liq. + fcc | bcc: Fe 0.989; L: Fe 0.9; fcc: Fe 0.995 | experimental | [3] Wang 2011; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 9, row 2; `ORC-A5QA2NXZAN` |  |
| 1658 | metatectic/catatectic: bcc(δ-Fe) -> fcc(γ-Fe) + L | L: Fe 0.911 | model | [1] Ye 2023; _cites ref. 112_ | Table 8, p. 14, row 4; `ORC-ITUFW42EGA` |  |
| 1658 | metatectic/catatectic: bcc(δ-Fe) -> fcc(γ-Fe) + L | L: Fe 0.918 | model | [1] Ye 2023; _cites ref. 111_ | Table 8, p. 14, row 3; `ORC-U3KZCMKQQ4` |  |
| 1658 | bcc -> liq. + fcc | bcc: Fe 0.9997; L: Fe 0.9179; fcc: Fe 1 | model | [3] Wang 2011 | Table 3, p. 9, row 1; `ORC-W2FBJJDBU3` |  |
| 1658 | metatectic/catatectic: bcc(δ-Fe) -> fcc(γ-Fe) + L | L: Fe 0.9 | experimental | [1] Ye 2023; _cites ref. 106_ | Table 8, p. 14, row 1; `ORC-YTNA7IHBB6` |  |
| 1636.15 | congruent melting: L ↔ Fe2Er | Fe2Er: Er 0.333 | model | [2] Wang 2012 | Table 2, p. 3, row 12; `ORC-SROF4MXVPO` |  |
| 1633.15 | congruent melting: L ↔ Fe2Er | Fe2Er: Er 0.333 | experimental | [2] Wang 2012; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 2, p. 3, row 11; `ORC-HSSSH7VMMP` |  |
| 1630 | peritectic: L + fcc(γ-Fe) -> Fe17Er2 | L: Fe 0.894 | model | [1] Ye 2023; _cites (cal_ | Table 8, p. 14, row 11; `ORC-TXOA3IMLJH` |  |
| 1628.15 | peritectic: L + (γFe) ↔ Fe17Er2 | Fe17Er2: Er 0.105 | experimental | [2] Wang 2012; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 2, p. 3, row 3; `ORC-S7ISMRLWDM` |  |
| 1628 | peritectic: L + fcc-Fe ↔ Fe17Er2 |  | experimental | [1] Ye 2023 | p. 5; `ORC-3AKIHW3VQB.4e96a5` | “Fe17Er2, Fe23Er6, and Fe3Er are produced by three peritectic transformations (L + fcc-Fe ↔ Fe17Er2 at 1628 K, L + Fe3Er ↔ Fe23Er6 at 1,603 K, and L + Fe2Er ↔ Fe3Er at 1,618 K), while Fe2Er melts congruently at 1,633 K.” |
| 1628 | peritectic: L + fcc(γ-Fe) -> Fe17Er2 | L: Fe 0.896 | experimental | [1] Ye 2023; _cites ref. 106_ | Table 8, p. 14, row 7; `ORC-IZXXZEG5CJ` |  |
| 1628 | peritectic: L+Fcc(Fe) -> Fe17Er2 | L: Fe 0.895; Fcc(Fe): Fe 1; Fe17Er2: Fe 0.894737 | experimental | [4] Zhou 2010; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 3, row 9; `ORC-RDBCHASHSV` |  |
| 1628 | liq. + fcc -> Er2Fe17 | L: Fe 0.88; fcc: Fe 1; Er2Fe17: Er 0.105263, Fe 0.894737 | experimental | [3] Wang 2011; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 9, row 4; `ORC-RKCS7LM4CQ` |  |
| 1626.15 | peritectic: L + (γFe) ↔ Fe17Er2 | L: Er 0.108; (γFe): Er 0.019; Fe17Er2: Er 0.105 | model | [2] Wang 2012 | Table 2, p. 3, row 4; `ORC-VAOZBSSFV6` |  |
| 1626 | peritectic: L + fcc(γ-Fe) -> Fe17Er2 | L: Fe 0.892 | model | [1] Ye 2023; _cites ref. 112_ | Table 8, p. 14, row 10; `ORC-KCPIETSVGB` |  |
| 1625.1 | peritectic: L + fcc(γ-Fe) -> Fe17Er2 | L: Fe 0.894 | model | [1] Ye 2023 | Table 8, p. 14, row 12; `ORC-GFIMYCPNEJ` |  |
| 1619 | peritectic: L + fcc(γ-Fe) -> Fe17Er2 | L: Fe 0.895 | model | [1] Ye 2023; _cites ref. 111_ | Table 8, p. 14, row 9; `ORC-IFO4XJ2LLD` |  |
| 1619 | liq. + fcc -> Er2Fe17 | L: Fe 0.8947; fcc: Fe 1; Er2Fe17: Er 0.105263, Fe 0.894737 | model | [3] Wang 2011 | Table 3, p. 9, row 3; `ORC-RMJWT5XUC5` |  |
| 1618.15 | peritectic: L + Fe2Er ↔ Fe3Er | Fe2Er: Er 0.333; Fe3Er: Er 0.25 | experimental | [2] Wang 2012; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 2, p. 3, row 9; `ORC-5QIUHKQX5A` |  |
| 1618 | peritectic: L + Fe2Er ↔ Fe3Er |  | experimental | [1] Ye 2023 | p. 5; `ORC-3AKIHW3VQB.5b088e` | “Fe17Er2, Fe23Er6, and Fe3Er are produced by three peritectic transformations (L + fcc-Fe ↔ Fe17Er2 at 1628 K, L + Fe3Er ↔ Fe23Er6 at 1,603 K, and L + Fe2Er ↔ Fe3Er at 1,618 K), while Fe2Er melts congruently at 1,633 K.” |
| 1618 | peritectic: L+Fe2Er -> Fe3ER | L: Fe 0.76; Fe2Er: Fe 0.666667; Fe3ER: Fe 0.75 | experimental | [4] Zhou 2010; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 3, row 5; `ORC-I325NXRMSY` |  |
| 1618 | peritectic: L + Fe2Er -> Fe3Er | L: Fe 0.752 | experimental | [1] Ye 2023; _cites ref. 106_ | Table 8, p. 14, row 25; `ORC-JEEQAKBNCE` |  |
| 1618 | liq. + ErFe2 -> ErFe3 | L: Fe 0.755; ErFe2: Er 0.333333, Fe 0.666667; ErFe3: Er 0.25, Fe 0.75 | experimental | [3] Wang 2011; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 9, row 6; `ORC-UA5M6DM7D3` |  |
| 1616 | peritectic: L+Fcc(Fe) -> Fe17Er2 | Fcc(Fe): Fe 1; Fe17Er2: Fe 0.894737 | unspecified | [4] Zhou 2010 | Table 3, p. 3, row 10; `ORC-H5LGHFKOCA` |  |
| 1616 | peritectic: L + fcc(γ-Fe) -> Fe17Er2 | L: Fe 0.895 | model | [1] Ye 2023; _cites ref. 110_ | Table 8, p. 14, row 8; `ORC-J7WRIH36WM` |  |
| 1615.85 | peritectic: L + Fe2Er ↔ Fe3Er | L: Er 0.25; Fe2Er: Er 0.333; Fe3Er: Er 0.25 | model | [2] Wang 2012 | Table 2, p. 3, row 10; `ORC-NP5YF4WKPU` |  |
| 1615.7 | peritectic: L + Fe2Er -> Fe3Er | L: Fe 0.75 | model | [1] Ye 2023; _cites ref. 112_ | Table 8, p. 14, row 28; `ORC-TRVV462Q7C` |  |
| 1615 | peritectic: L + Fe2Er -> Fe3Er | L: Fe 0.75 | model | [1] Ye 2023 | Table 8, p. 14, row 30; `ORC-X2OATXO3FA` |  |
| 1612 | peritectic: L + Fe2Er -> Fe3Er | L: Fe 0.721 | model | [1] Ye 2023; _cites (cal_ | Table 8, p. 14, row 29; `ORC-ZQLRDX2L3B` |  |
| 1611 | peritectic: L+Fe2Er -> Fe3ER | Fe2Er: Fe 0.666667; Fe3ER: Fe 0.75 | model | [4] Zhou 2010 | Table 3, p. 3, row 6; `ORC-5HYFGCZUPK` |  |
| 1611 | peritectic: L + Fe2Er -> Fe3Er | L: Fe 0.765 | model | [1] Ye 2023; _cites ref. 111_ | Table 8, p. 14, row 27; `ORC-MEJ6TUT2CQ` |  |
| 1611 | peritectic: L + Fe2Er -> Fe3Er | L: Fe 0.76 | model | [1] Ye 2023; _cites ref. 110_ | Table 8, p. 14, row 26; `ORC-QATNAH2YUR` |  |
| 1611 | liq. + ErFe2 -> ErFe3 | L: Fe 0.7647; ErFe2: Er 0.333333, Fe 0.666667; ErFe3: Er 0.25, Fe 0.75 | model | [3] Wang 2011 | Table 3, p. 9, row 5; `ORC-TKJKF4QQT7` |  |
| 1603.15 | peritectic: L + Fe3Er ↔ Fe23Er6 | Fe3Er: Er 0.25; Fe23Er6: Er 0.207 | experimental | [2] Wang 2012; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 2, p. 3, row 7; `ORC-B5QHBDB5ZN` |  |
| 1603 | peritectic: L + Fe3Er ↔ Fe23Er6 |  | experimental | [1] Ye 2023 | p. 5; `ORC-3AKIHW3VQB.594859` | “Fe17Er2, Fe23Er6, and Fe3Er are produced by three peritectic transformations (L + fcc-Fe ↔ Fe17Er2 at 1628 K, L + Fe3Er ↔ Fe23Er6 at 1,603 K, and L + Fe2Er ↔ Fe3Er at 1,618 K), while Fe2Er melts congruently at 1,633 K.” |
| 1603 | peritectic: L+ Fe3Er -> Fe23Er6 | L: Fe 0.803 | experimental | [1] Ye 2023; _cites ref. 106_ | Table 8, p. 14, row 19; `ORC-KNEV76PBVS` |  |
| 1603 | peritectic: L+Fe3Er -> Fe23Er6 | L: Fe 0.809; Fe3Er: Fe 0.75; Fe23Er6: Fe 0.793103 | experimental | [4] Zhou 2010; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 3, row 7; `ORC-OPPR7LCHIQ` |  |
| 1603 | liq. + ErFe3 -> Er6Fe23 | L: Fe 0.8; ErFe3: Er 0.25, Fe 0.75; Er6Fe23: Er 0.206897, Fe 0.793103 | experimental | [3] Wang 2011; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 9, row 8; `ORC-SGUZYCD4FN` |  |
| 1602.85 | peritectic: L + Fe3Er ↔ Fe23Er6 | L: Er 0.19; Fe3Er: Er 0.25; Fe23Er6: Er 0.207 | model | [2] Wang 2012 | Table 2, p. 3, row 8; `ORC-VMM7T4VGIT` |  |
| 1602.7 | peritectic: L+ Fe3Er -> Fe23Er6 | L: Fe 0.811 | model | [1] Ye 2023 | Table 8, p. 14, row 24; `ORC-MJBHSFOYMT` |  |
| 1602.7 | peritectic: L+ Fe3Er -> Fe23Er6 | L: Fe 0.81 | model | [1] Ye 2023; _cites ref. 112_ | Table 8, p. 14, row 22; `ORC-PXQNCYTB6T` |  |
| 1601.8 | eutectic: L -> Fe17Er2 + Fe23Er6 | L: Fe 0.818 | model | [1] Ye 2023 | Table 8, p. 14, row 18; `ORC-PXXEJTWS7X` |  |
| 1601 | peritectic: L+ Fe3Er -> Fe23Er6 | L: Fe 0.809 | model | [1] Ye 2023; _cites ref. 110_ | Table 8, p. 14, row 20; `ORC-5HKDBFXBER` |  |
| 1601 | peritectic: L+Fe3Er -> Fe23Er6 | Fe3Er: Fe 0.75; Fe23Er6: Fe 0.793103 | model | [4] Zhou 2010 | Table 3, p. 3, row 8; `ORC-AX2I63YEUE` |  |
| 1600.65 | eutectic: L ↔ Fe17Er2 + Fe23Er6 | L: Er 0.178; Fe17Er2: Er 0.105; Fe23Er6: Er 0.207 | model | [2] Wang 2012 | Table 2, p. 3, row 6; `ORC-W7VMT6D44K` |  |
| 1600.5 | eutectic: L -> Fe17Er2 + Fe23Er6 | L: Fe 0.822 | model | [1] Ye 2023; _cites ref. 112_ | Table 8, p. 14, row 16; `ORC-RDJKHS33WG` |  |
| 1600 | liq. + ErFe3 -> Er6Fe23 | L: Fe 0.8177; ErFe3: Er 0.25, Fe 0.75; Er6Fe23: Er 0.206897, Fe 0.793103 | model | [3] Wang 2011 | Table 3, p. 9, row 7; `ORC-4YRNY4IO3L` |  |
| 1600 | eutectic: L -> Fe17Er2 + Fe23Er6 | L: Fe 0.819 | model | [1] Ye 2023; _cites ref. 111_ | Table 8, p. 14, row 15; `ORC-DBVSUK3W4M.4453b4` |  |
| 1600 | peritectic: L+ Fe3Er -> Fe23Er6 | L: Fe 0.818 | model | [1] Ye 2023; _cites ref. 111_ | Table 8, p. 14, row 21; `ORC-DBVSUK3W4M.5a75fb` |  |
| 1600 | eutectic: liq. -> Er6Fe23 + Er2Fe17 | L: Fe 0.8186; Er6Fe23: Er 0.206897, Fe 0.793103; Er2Fe17: Er 0.105263, Fe 0.894737 | model | [3] Wang 2011 | Table 3, p. 9, row 9; `ORC-DL3M3LA3VU` |  |
| 1599 | eutectic: L -> Fe17Er2 + Fe23Er6 | L: Fe 0.826 | model | [1] Ye 2023; _cites ref. 110_ | Table 8, p. 14, row 14; `ORC-VBXA2OI6CB` |  |
| 1599 | eutectic: L -> Fe23Er6+Fe17Er2 | L: Fe 0.826; Fe23Er6: Fe 0.793103; Fe17Er2: Fe 0.894737 | model | [4] Zhou 2010 | Table 3, p. 3, row 4; `ORC-Z6FGXXZH6F` |  |
| 1595 | peritectic: L+ Fe3Er -> Fe23Er6 | L: Fe 0.798 | model | [1] Ye 2023; _cites (cal_ | Table 8, p. 14, row 23; `ORC-LIJ2FO65XN` |  |
| 1588.15 | eutectic: L ↔ Fe17Er2 + Fe23Er6 | L: Er 0.165; Fe17Er2: Er 0.105; Fe23Er6: Er 0.207 | experimental | [2] Wang 2012; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 2, p. 3, row 5; `ORC-EXMQRZWZCO` |  |
| 1588 | eutectic: L -> Fe23Er6+Fe17Er2 | L: Fe 0.835; Fe23Er6: Fe 0.793103; Fe17Er2: Fe 0.894737 | experimental | [4] Zhou 2010; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 3, row 3; `ORC-3OE53IXMIX` |  |
| 1588 | eutectic: L ↔ Fe17Er2 + Fe23Er6 |  | experimental | [1] Ye 2023; _cites ref. 106_ | p. 5; `ORC-CZY7CUAHTJ.ef240e` | “The experimental results\[106-108\] show two eutectic transformations (L ↔ Fe17Er2 + Fe23Er6 at 1,588 K and L ↔ Fe2Er + hcp-Er at 1,188 K).” |
| 1588 | eutectic: liq. -> Er6Fe23 + Er2Fe17 | L: Fe 0.835; Er6Fe23: Er 0.206897, Fe 0.793103; Er2Fe17: Er 0.105263, Fe 0.894737 | experimental | [3] Wang 2011; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 9, row 10; `ORC-O67V6KYERC` |  |
| 1588 | eutectic: L -> Fe17Er2 + Fe23Er6 | L: Fe 0.835 | experimental | [1] Ye 2023; _cites ref. 106_ | Table 8, p. 14, row 13; `ORC-W4CXK3L3WM` |  |
| 1581 | eutectic: L -> Fe17Er2 + Fe23Er6 | L: Fe 0.829 | model | [1] Ye 2023; _cites (cal_ | Table 8, p. 14, row 17; `ORC-RDG3CDH7ND` |  |
| 1189 | eutectic: L -> Fe2Er + hcp-Er | L: Fe 0.316 | model | [1] Ye 2023; _cites (cal_ | Table 8, p. 14, row 41; `ORC-JLSXL7C2M5` |  |
| 1189 | eutectic: liq. -> hcp + ErFe2 | L: Fe 0.2806; hcp: Fe 1.000e-4; ErFe2: Er 0.333333, Fe 0.666667 | model | [3] Wang 2011 | Table 3, p. 9, row 11; `ORC-WNRJH5V32E` |  |
| 1189 | eutectic: L -> Fe2Er + hcp-Er | L: Fe 0.281 | model | [1] Ye 2023; _cites ref. 111_ | Table 8, p. 14, row 39; `ORC-YODYZXM5JV` |  |
| 1188.15 | eutectic: L ↔ Fe2Er + (Er) | L: Er 0.7; Fe2Er: Er 0.333; (Er): Er 1 | experimental | [2] Wang 2012; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 2, p. 3, row 13; `ORC-ID2TCNMF56` |  |
| 1188.05 | eutectic: L ↔ Fe2Er + (Er) | L: Er 0.687; Fe2Er: Er 0.333; (Er): Er 1 | model | [2] Wang 2012 | Table 2, p. 3, row 14; `ORC-WFYJP4JZKP` |  |
| 1188 | eutectic: liq. -> hcp + ErFe2 | L: Fe 0.3; ErFe2: Er 0.333333, Fe 0.666667 | experimental | [3] Wang 2011; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 9, row 12; `ORC-6LJDL43TUX` |  |
| 1188 | eutectic: L ↔ Fe2Er + hcp-Er |  | experimental | [1] Ye 2023; _cites ref. 106_ | p. 5; `ORC-CZY7CUAHTJ.6bf0c0` | “The experimental results\[106-108\] show two eutectic transformations (L ↔ Fe17Er2 + Fe23Er6 at 1,588 K and L ↔ Fe2Er + hcp-Er at 1,188 K).” |
| 1188 | eutectic: L -> hcp (Er)+Fe2Er | L: Fe 0.3; Fe2Er: Fe 0.666667 | experimental | [4] Zhou 2010; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 3, row 1; `ORC-LRXRZPZ7TZ` |  |
| 1188 | eutectic: L -> Fe2Er + hcp-Er | L: Fe 0.3 | experimental | [1] Ye 2023; _cites ref. 106_ | Table 8, p. 14, row 37; `ORC-SETDAD4IEO` |  |
| 1187.9 | eutectic: L -> Fe2Er + hcp-Er | L: Fe 0.313 | model | [1] Ye 2023; _cites ref. 112_ | Table 8, p. 14, row 40; `ORC-WGZSTG5HDO` |  |
| 1186 | Er2Fe17 + fcc -> bcc | Er2Fe17: Er 0.105263, Fe 0.894737; fcc: Fe 1; bcc: Fe 1 | model | [3] Wang 2011 | Table 3, p. 9, row 13; `ORC-T62GEDOE7Q` |  |
| 1185.6 | eutectic: L -> Fe2Er + hcp-Er | L: Fe 0.331 | model | [1] Ye 2023 | Table 8, p. 14, row 42; `ORC-Q3VSP2HJL2` |  |
| 1185 | eutectic: L -> Fe2Er + hcp-Er | L: Fe 0.308 | model | [1] Ye 2023; _cites ref. 110_ | Table 8, p. 14, row 38; `ORC-5REY7N4SGL` |  |
| 1185 | eutectic: L -> hcp (Er)+Fe2Er | L: Fe 0.308; Fe2Er: Fe 0.666667 | model | [4] Zhou 2010 | Table 3, p. 3, row 2; `ORC-BS4FSDHWBL` |  |
| 1185 | Er2Fe17 + fcc -> bcc | Er2Fe17: Er 0.105263, Fe 0.894737; fcc: Fe 1; bcc: Fe 1 | experimental | [3] Wang 2011; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 9, row 14; `ORC-UJYEW6642J` |  |
| 1184.8 | peritectoid: Fe17Er2 + fcc(γ-Fe) -> bcc(α-Fe) |  | model | [1] Ye 2023 | Table 8, p. 14, row 6; `ORC-F54TI7STWQ` |  |

## 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, Er–Fe system (6)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Fe17Er2 | [Er2Fe17](https://data.orchid-project.org/compounds/Er2Fe17.html) | -9.85 kJ/mol-atom | 298.15 | model | -1.801 (mp-aaaaacoi) | -2.176 (oqmd-91107) | [4] Zhou 2010 | Table 4, p. 3, row 1; `ORC-QNMNNIFCBL` |  |
| Fe23Er6 | [Er6Fe23](https://data.orchid-project.org/compounds/Er6Fe23.html) | -11.1 kJ/mol-atom | 298.15 | model | -6.997 (mp-aaaaadfe) | -6.957 (oqmd-29960) | [4] Zhou 2010 | Table 4, p. 3, row 2; `ORC-W6REV2RMC4` |  |
| Fe2Er | [ErFe2](https://data.orchid-project.org/compounds/ErFe2.html) | -12.5 kJ/mol-atom | 298.15 | model | -11.663 (mp-aaaaaasg) | -11.54 (oqmd-20826) | [4] Zhou 2010 | Table 4, p. 3, row 6; `ORC-COGLJF23S6` |  |
| Fe2Er | [ErFe2](https://data.orchid-project.org/compounds/ErFe2.html) | -12.5 kJ/mol-atom | 298.15 | experimental | -11.663 (mp-aaaaaasg) | -11.54 (oqmd-20826) | [4] Zhou 2010; _cites Norgren 1998_ [doi](https://doi.org/10.1007/s11661-998-0351-3) | Table 4, p. 3, row 5; `ORC-H5OLRJ7EH6` |  |
| Fe3Er | [ErFe3](https://data.orchid-project.org/compounds/ErFe3.html) | -11.6 kJ/mol-atom | 298.15 | model | -9.581 (mp-aaabgkwt) | -9.688 (oqmd-29959) | [4] Zhou 2010 | Table 4, p. 3, row 4; `ORC-COS2QTPNWM` |  |
| Fe3Er | [ErFe3](https://data.orchid-project.org/compounds/ErFe3.html) | -7.9 kJ/mol-atom | 298.15 | experimental | -9.581 (mp-aaabgkwt) | -9.688 (oqmd-29959) | [4] Zhou 2010; _cites Norgren 1998_ [doi](https://doi.org/10.1007/s11661-998-0351-3) | Table 4, p. 3, row 3; `ORC-PHIWWIFZIB` |  |

## Other properties

### Phase transition (14)

Table: Phase transition, Er–Fe system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1603 K | 1603 | Fe23Er6 | experimental | [4] Zhou 2010 | p. 1; `ORC-6JPK5MFD2A.e3b30b` | “Among them, Fe3Er, Fe23Er6, and Fe17Er2 decompose at 1618, 1603, and 1628 K, respectively.” |
| Phase transition | 1618 K | 1618 | Fe3Er | experimental | [4] Zhou 2010 | p. 1; `ORC-6JPK5MFD2A.b43008` | “Among them, Fe3Er, Fe23Er6, and Fe17Er2 decompose at 1618, 1603, and 1628 K, respectively.” |
| Phase transition | 1628 K | 1628 | Fe17Er2 | experimental | [4] Zhou 2010 | p. 1; `ORC-6JPK5MFD2A.e1dd53` | “Among them, Fe3Er, Fe23Er6, and Fe17Er2 decompose at 1618, 1603, and 1628 K, respectively.” |
| Phase transition | 1632 K | 1632 | congruent melting: L -> Fe2Er; _L: Fe 0.667_ | model | [1] Ye 2023; _cites ref. 110_ | Table 8, p. 14, row 32; `ORC-3VDKNYKO7J` |  |
| Phase transition | 1632 K | 1632 | congruent melting: L -> Fe2Er; _L: Fe 0.666667; Fe2Er: Fe 0.666667_ | model | [4] Zhou 2010 | Table 3, p. 3, row 12; `ORC-PES6LEFY6L` |  |
| Phase transition | 1632 K | 1632 | congruent transformation | model | [4] Zhou 2010 | p. 3; `ORC-DJ6BGLUMMH` | “As shown in this table, the calculated congruent-melting point of the Fe2Er phases is 1632 K, which fit well with the work of Buschow and Van der Goot \[11\].” |
| Phase transition | 1633 K | 1633 | congruent melting: L -> Fe2Er; _L: Fe 0.667_ | experimental | [1] Ye 2023; _cites ref. 106_ | Table 8, p. 14, row 31; `ORC-GMBKFQUEQT` |  |
| Phase transition | 1633 K | 1633 | congruent melting: L -> Fe2Er; _L: Fe 0.667_ | model | [1] Ye 2023; _cites ref. 111_ | Table 8, p. 14, row 33; `ORC-I6LZVFNJHF` |  |
| Phase transition | 1633 K | 1633 | congruent melting: L -> Fe2Er; _L: Fe 0.667_ | model | [1] Ye 2023; _cites (cal_ | Table 8, p. 14, row 35; `ORC-MGYGBEYNE6` |  |
| Phase transition | 1633 K | 1633 | congruent melting: L -> Fe2Er; _L: Fe 0.666667; Fe2Er: Fe 0.666667_ | experimental | [4] Zhou 2010; _cites Buschow 1969_ [doi](https://doi.org/10.1002/pssb.19690350154) | Table 3, p. 3, row 11; `ORC-OGOB27OS6O` |  |
| Phase transition | 1633 K | 1633 | congruent transformation | experimental | [1] Ye 2023 | p. 5; `ORC-3AKIHW3VQB.dee46b` | “Fe17Er2, Fe23Er6, and Fe3Er are produced by three peritectic transformations (L + fcc-Fe ↔ Fe17Er2 at 1628 K, L + Fe3Er ↔ Fe23Er6 at 1,603 K, and L + Fe2Er ↔ Fe3Er at 1,618 K), while Fe2Er melts congruently at 1,633 K.” |
| Phase transition | 1633 K | 1633 | congruent transformation | experimental | [4] Zhou 2010 | p. 1; `ORC-NPHFEYFST7` | “Fe2Er melt congruently decompose at 1633 K.” |
| Phase transition | 1636 K | 1636 | congruent melting: L -> Fe2Er; _L: Fe 0.667_ | model | [1] Ye 2023; _cites ref. 112_ | Table 8, p. 14, row 34; `ORC-FKLBAICQCM` |  |
| Phase transition | 1640.4 K | 1640.4 | congruent melting: L -> Fe2Er; _L: Fe 0.667_ | model | [1] Ye 2023 | Table 8, p. 14, row 36; `ORC-NCU357KLMJ` |  |

### Mixing / partial (18)

Table: Mixing / partial, Er–Fe system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Enthalpy of mixing; _printed: ΔmixH_ | -6.43448 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.007_ | model | [4] Zhou 2010 | Table 5, p. 4, row 14; `ORC-2LFIJUI3RQ` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -2.86302 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.002_ | model | [4] Zhou 2010 | Table 5, p. 4, row 3; `ORC-4JLJXEF4E7` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -1.47969 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.001_ | model | [4] Zhou 2010 | Table 5, p. 4, row 1; `ORC-ADBOPGFSC6` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -8.14493 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.006_ | model | [4] Zhou 2010 | Table 5, p. 4, row 12; `ORC-CD4SG6RMBA` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -6.08152 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.005_ | model | [4] Zhou 2010 | Table 5, p. 4, row 9; `ORC-CKJ4ZXQOMQ` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -4.66667 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.001_ | model | [4] Zhou 2010 | Table 5, p. 4, row 2; `ORC-G5VBTIBU5X` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -2.05797 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.009_ | model | [4] Zhou 2010 | Table 5, p. 4, row 18; `ORC-I4CBT2DEUR` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -2.1508 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.009_ | model | [4] Zhou 2010 | Table 5, p. 4, row 17; `ORC-IGKKTLLXH2` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -4.4058 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.008_ | model | [4] Zhou 2010 | Table 5, p. 4, row 16; `ORC-ISG255IQIJ` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -7.3913 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.002_ | model | [4] Zhou 2010 | Table 5, p. 4, row 4; `ORC-JC2OEM4UH7` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -6.14653 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.006_ | model | [4] Zhou 2010 | Table 5, p. 4, row 11; `ORC-OA42MC4NBW` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -5.29093 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.004_ | model | [4] Zhou 2010 | Table 5, p. 4, row 7; `ORC-PCKEKHUA5U` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -9.15421 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.003_ | model | [4] Zhou 2010 | Table 5, p. 4, row 6; `ORC-QOGUR4EZ2A` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -5.48 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.007_ | model | [4] Zhou 2010 | Table 5, p. 4, row 13; `ORC-SEKBE6UGGV` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -9.30435 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.005_ | model | [4] Zhou 2010 | Table 5, p. 4, row 10; `ORC-V4M4VMCIXE` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -4.1664 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.003_ | model | [4] Zhou 2010 | Table 5, p. 4, row 5; `ORC-XSW6T4XHQZ` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -4.06706 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.008_ | model | [4] Zhou 2010 | Table 5, p. 4, row 15; `ORC-YUQIPNSQWU` |  |
| Enthalpy of mixing; _printed: ΔmixH_ | -9.62319 kJ/mol-atom | 1573 | liquid; _alloy: Fe 0.004_ | model | [4] Zhou 2010 | Table 5, p. 4, row 8; `ORC-YVTGWNYORK` |  |

## 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.L. Wang, J.J. Han, C.P. Wang, S.Z. Kou, X.J. Liu, Thermodynamic assessment and the composition prediction of amorphous alloy in the Fe–B–Er alloy system, Journal of Alloys and Compounds 513, 27-34 (2012). [doi:10.1016/j.jallcom.2011.08.014](https://doi.org/10.1016/j.jallcom.2011.08.014)
3. Wei Wang, Cuiping Guo, Changrong Li, Zhenmin Du, Thermodynamic description of the Er–Fe–Sb system, Calphad 35, 292-301 (2011). [doi:10.1016/j.calphad.2011.04.001](https://doi.org/10.1016/j.calphad.2011.04.001)
4. G.J. Zhou, Z.W. Liu, D.C. Zeng, Z.P. Jin, Thermodynamic assessment of the Fe–Er system, Physica B: Condensed Matter 405, 3590-3593 (2010). [doi:10.1016/j.physb.2010.05.046](https://doi.org/10.1016/j.physb.2010.05.046)

## 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/).