# Er–Ge system

> Er–Ge system: 142 accepted literature values (formation 98, invariant reaction 29, phase transition 15) and 1 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

142 accepted literature values from 1 paper(s) (experimental 50, model 92); 1 calculated phase diagram(s). 11 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-GE.json) · [CSV](https://data.orchid-project.org/systems/ER-GE.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#ER-GE) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#ER-GE/ErGe-17Ach.json) · [phases (16)](https://data.orchid-project.org/phases/pages/ER-GE.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/ER-GE.html) · [Markdown](https://data.orchid-project.org/systems/ER-GE.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 50 |
| model | 92 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 29 |
| phase transition | 15 |
| formation | 98 |

## 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 |
|---|---|---|---|
| ErGe-17Ach.tdb | K. Achgar, S. Kardellass, N. Selhaoui, L. Bouirden, J. Alloys Compd., 724, 1157-66(2017). [doi:10.1016/j.jallcom.2017.07.129](https://doi.org/10.1016/j.jallcom.2017.07.129) | `734d825c539b2116bc40e48db92f736d49fcf28423faf12a27652e29002bc34e` | [viewer](https://orchid-project.org/phase-diagrams/#ER-GE/ErGe-17Ach.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/ErGe-17Ach.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/ErGe-17Ach.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| ErGe-17Ach.tdb | 2153.2 | ER5GE3_D88 (x(Ge) 0.39504) + LIQUID (x(Ge) 0.44241) + ER5GE4 (x(Ge) 0.44444) |
| ErGe-17Ach.tdb | 2153.2 | ER5GE3_D88 (x(Ge) 0.39509) + LIQUID (x(Ge) 0.44251) + ER5GE4 (x(Ge) 0.44444) |
| ErGe-17Ach.tdb | 1978.86 | ER5GE4 (x(Ge) 0.44444) + ER11GE10 (x(Ge) 0.47619) + LIQUID (x(Ge) 0.53245) |
| ErGe-17Ach.tdb | 1978.86 | ER5GE4 (x(Ge) 0.44444) + ER11GE10 (x(Ge) 0.47619) + LIQUID (x(Ge) 0.53238) |
| ErGe-17Ach.tdb | 1739.39 | ER11GE10 (x(Ge) 0.47619) + ERGE_B33 (x(Ge) 0.5) + LIQUID (x(Ge) 0.59763) |
| ErGe-17Ach.tdb | 1739.39 | ER11GE10 (x(Ge) 0.47619) + ERGE_B33 (x(Ge) 0.5) + LIQUID (x(Ge) 0.59767) |
| ErGe-17Ach.tdb | 1739.39 | ER11GE10 (x(Ge) 0.47619) + ERGE_B33 (x(Ge) 0.5) + LIQUID (x(Ge) 0.59761) |
| ErGe-17Ach.tdb | 1676.46 | ERGE_B33 (x(Ge) 0.5) + ER2GE3_C32 (x(Ge) 0.6) + LIQUID (x(Ge) 0.61374) |
| ErGe-17Ach.tdb | 1676.46 | ERGE_B33 (x(Ge) 0.5) + ER2GE3_C32 (x(Ge) 0.6) + LIQUID (x(Ge) 0.61376) |
| ErGe-17Ach.tdb | 1676.46 | ERGE_B33 (x(Ge) 0.5) + ER2GE3_C32 (x(Ge) 0.6) + LIQUID (x(Ge) 0.61356) |
| ErGe-17Ach.tdb | 1595.38 | HCP_A3 (x(Ge) 0) + LIQUID (x(Ge) 0.154) + ER5GE3_D88 (x(Ge) 0.375) |
| ErGe-17Ach.tdb | 1595.38 | HCP_A3 (x(Ge) 0) + LIQUID (x(Ge) 0.15397) + ER5GE3_D88 (x(Ge) 0.375) |
| ErGe-17Ach.tdb | 1535.75 | ERGE_B33 (x(Ge) 0.5) + ER3GE4 (x(Ge) 0.57143) + ER2GE3_C32 (x(Ge) 0.6) |
| ErGe-17Ach.tdb | 1313.59 | ER2GE3_C32 (x(Ge) 0.6) + ERGE2_HT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.7588) |
| ErGe-17Ach.tdb | 1313.58 | ER2GE3_C32 (x(Ge) 0.6) + ERGE2_HT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.75892) |
| ErGe-17Ach.tdb | 1239 | ER3GE4 (x(Ge) 0.57143) + ER2GE3_LT (x(Ge) 0.6) + ER2GE3_C32 (x(Ge) 0.6) |
| ErGe-17Ach.tdb | 1239 | ER2GE3_C32 (x(Ge) 0.6) + ER2GE3_LT (x(Ge) 0.6) + ERGE2_HT (x(Ge) 0.66667) |
| ErGe-17Ach.tdb | 1234.45 | ER2GE3_LT (x(Ge) 0.6) + ERGE2_HT (x(Ge) 0.66667) + ERGE2_MT (x(Ge) 0.66667) |
| ErGe-17Ach.tdb | 1234.45 | ERGE2_MT (x(Ge) 0.66667) + ERGE2_HT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.79517) |
| ErGe-17Ach.tdb | 1234.45 | ERGE2_HT (x(Ge) 0.66667) + ERGE2_MT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.79526) |
| ErGe-17Ach.tdb | 1179.78 | ER2GE3_LT (x(Ge) 0.6) + ERGE2_LT (x(Ge) 0.66667) + ERGE2_MT (x(Ge) 0.66667) |
| ErGe-17Ach.tdb | 1179.78 | ERGE2_LT (x(Ge) 0.66667) + ERGE2_MT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.81864) |
| ErGe-17Ach.tdb | 1179.78 | ERGE2_MT (x(Ge) 0.66667) + ERGE2_LT (x(Ge) 0.66667) + LIQUID (x(Ge) 0.81877) |
| ErGe-17Ach.tdb | 1153.27 | ERGE2_LT (x(Ge) 0.66667) + ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83025) |
| ErGe-17Ach.tdb | 1153.27 | ERGE2_LT (x(Ge) 0.66667) + ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83023) |
| ErGe-17Ach.tdb | 1153.27 | ERGE2_LT (x(Ge) 0.66667) + ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83038) |
| ErGe-17Ach.tdb | 1139.25 | ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83986) + DIAMOND_A4 (x(Ge) 1) |
| ErGe-17Ach.tdb | 1139.25 | ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83993) + DIAMOND_A4 (x(Ge) 1) |
| ErGe-17Ach.tdb | 1139.25 | ER2GE5 (x(Ge) 0.71429) + LIQUID (x(Ge) 0.83995) + DIAMOND_A4 (x(Ge) 1) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/ER/ER-GE.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/ER/ER-GE.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Er–Ge system (29)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 2151.15 | peritectic: Er5Ge3 -> L + Er5Ge4 | Er5Ge3: Ge 0.375; L: Ge 0.432; Er5Ge4: Ge 0.444444 | model | [1] Achgar 2017 | Table 2, p. 5, row 11; `ORC-FFHF74OYEX` |  |
| 2148.15 | peritectic: Er5Ge3 -> L + Er5Ge4 | Er5Ge3: Ge 0.375; L: Ge 0.443; Er5Ge4: Ge 0.444444 | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 10; `ORC-W7MW5KQZZS` |  |
| 2147.15 | peritectic: Er5Ge3 -> L + Er5Ge4 | Er5Ge3: Ge 0.375; L: Ge 0.437; Er5Ge4: Ge 0.444444 | model | [1] Achgar 2017 | Table 2, p. 5, row 12; `ORC-OASNVR2AU2` |  |
| 1993.15 | peritectic: Er5Ge4 -> L + Er11Ge10 | Er5Ge4: Ge 0.444444; L: Ge 0.479; Er11Ge10: Ge 0.47619 | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 13; `ORC-2CTSNC4ZBM` |  |
| 1992.15 | peritectic: Er5Ge4 -> L + Er11Ge10 | Er5Ge4: Ge 0.444444; L: Ge 0.527; Er11Ge10: Ge 0.47619 | model | [1] Achgar 2017 | Table 2, p. 5, row 15; `ORC-UPTT5UMUMJ` |  |
| 1991.15 | peritectic: Er5Ge4 -> L + Er11Ge10 | Er5Ge4: Ge 0.444444; L: Ge 0.529; Er11Ge10: Ge 0.47619 | model | [1] Achgar 2017 | Table 2, p. 5, row 14; `ORC-442HUOQIOU` |  |
| 1724.15 | peritectic: Er11Ge10 -> L + Er Ge | Er11Ge10: Ge 0.47619; L: Ge 0.568; Er Ge: Ge 0.5 | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 16; `ORC-X45FPHSIRN` |  |
| 1722.15 | peritectic: Er11Ge10 -> L + Er Ge | Er11Ge10: Ge 0.47619; L: Ge 0.602; Er Ge: Ge 0.5 | model | [1] Achgar 2017 | Table 2, p. 5, row 17; `ORC-FIY6QJMW22` |  |
| 1717.15 | peritectic: Er11Ge10 -> L + Er Ge | Er11Ge10: Ge 0.47619; L: Ge 0.602; Er Ge: Ge 0.5 | model | [1] Achgar 2017 | Table 2, p. 5, row 18; `ORC-4KC24F54EV` |  |
| 1678.15 | peritectic: ErGe -> L + HT_Er2Ge3 | ErGe: Ge 0.5; L: Ge 0.633; HT_Er2Ge3: Ge 0.6 | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 31; `ORC-E53EH7EWCE` |  |
| 1677.15 | peritectic: ErGe -> L + HT_Er2Ge3 | ErGe: Ge 0.5; L: Ge 0.612; HT_Er2Ge3: Ge 0.6 | model | [1] Achgar 2017 | Table 2, p. 5, row 33; `ORC-V5D4775M3H` |  |
| 1676.15 | peritectic: ErGe -> L + HT_Er2Ge3 | ErGe: Ge 0.5; L: Ge 0.613; HT_Er2Ge3: Ge 0.6 | model | [1] Achgar 2017 | Table 2, p. 5, row 32; `ORC-LOQUFLLWJE` |  |
| 1640.15 | peritectoid: Er3Ge4 -> Er Ge2 + HT_Er2Ge3 | Er3Ge4: Ge 0.571; Er Ge2: Ge 0.666667; HT_Er2Ge3: Ge 0.6 | model | [1] Achgar 2017 | Table 2, p. 5, row 21; `ORC-MGTJBEKNLJ` |  |
| 1640.15 | peritectoid: Er3Ge4 -> Er Ge2 + HT_Er2Ge3 | Er3Ge4: Ge 0.571; Er Ge2: Ge 0.666667; HT_Er2Ge3: Ge 0.6 | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 19; `ORC-O2TFZVXUY4` |  |
| 1639.15 | peritectoid: Er3Ge4 -> Er Ge2 + HT_Er2Ge3 | Er3Ge4: Ge 0.571; Er Ge2: Ge 0.666667; HT_Er2Ge3: Ge 0.6 | model | [1] Achgar 2017 | Table 2, p. 5, row 20; `ORC-ZX4YHZ6OPU` |  |
| 1599.15 | eutectic: L -> Er + Er5Ge3 | L: Ge 0.152; Er5Ge3: Ge 0.375 | model | [1] Achgar 2017 | Table 2, p. 5, row 6; `ORC-AR3KBVRY7M` |  |
| 1595.15 | eutectic |  | experimental | [1] Achgar 2017; _cites Tsuchiya 2006_ [doi](https://doi.org/10.1143/jjap.45.2925) | p. 2; `ORC-LPH6I7FVSN` | “The addition of germanium to erbium results in eutectic reaction among liquid, Er (hcp_A3) and Er5Ge3 at 1322 C about 12 at.% Ge in Ge rich part.” |
| 1595.15 | eutectic: L -> Er + Er5Ge3 | L: Ge 0.12; Er5Ge3: Ge 0.375 | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 4; `ORC-MZWUFUOECL` |  |
| 1595.15 | eutectic: L -> Er + Er5Ge3 | L: Ge 0.15; Er5Ge3: Ge 0.375 | model | [1] Achgar 2017 | Table 2, p. 5, row 5; `ORC-OJVVUXAYL5` |  |
| 1319.15 | peritectic: HT_Er2Ge3 -> L + HT_ErGe2 | HT_Er2Ge3: Ge 0.6; L: Ge 0.757; HT_ErGe2: Ge 0.666667 | model | [1] Achgar 2017 | Table 2, p. 5, row 35; `ORC-MFABRCYL2P` |  |
| 1315.15 | peritectic: HT_Er2Ge3 -> L + HT_ErGe2 | HT_Er2Ge3: Ge 0.6; L: Ge 0.757; HT_ErGe2: Ge 0.666667 | model | [1] Achgar 2017 | Table 2, p. 5, row 36; `ORC-T7HOP242MC` |  |
| 1310.15 | peritectic: HT_Er2Ge3 -> L + HT_ErGe2 | HT_Er2Ge3: Ge 0.6; L: Ge 0.768; HT_ErGe2: Ge 0.666667 | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 34; `ORC-P66Y2HII7X` |  |
| 1164.15 | peritectic: LT_ErGe2 -> L + Er2Ge5 | LT_ErGe2: Ge 0.666667; L: Ge 0.826; Er2Ge5: Ge 0.714286 | model | [1] Achgar 2017 | Table 2, p. 5, row 38; `ORC-3UBMNBPV5L` |  |
| 1164.15 | peritectic: LT_ErGe2 -> L + Er2Ge5 | LT_ErGe2: Ge 0.666667; L: Ge 0.824; Er2Ge5: Ge 0.714286 | model | [1] Achgar 2017 | Table 2, p. 5, row 39; `ORC-ZGA7N2UBRZ` |  |
| 1163.15 | peritectic: LT_ErGe2 -> L + Er2Ge5 | LT_ErGe2: Ge 0.666667; L: Ge 0.833; Er2Ge5: Ge 0.714286 | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 37; `ORC-OUPOVMIIQC` |  |
| 1150.15 | eutectic: L -> Er2Ge5 + Ge | L: Ge 0.85; Er2Ge5: Ge 0.714286; Ge: Ge 1 | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 40; `ORC-AKNVMKWN3M` |  |
| 1150.15 | eutectic |  | experimental | [1] Achgar 2017 | p. 2; `ORC-YMKCQB2CMA` | “The addition of erbium to germanium results in a eutectic reaction among liquid, Er2Ge5 and Ge (diamond_A4) at 877 C and about 85 at. % Ge.” |
| 1142.15 | eutectic: L -> Er2Ge5 + Ge | L: Ge 0.841; Er2Ge5: Ge 0.714286; Ge: Ge 1 | model | [1] Achgar 2017 | Table 2, p. 5, row 41; `ORC-OQI5DH4LYY` |  |
| 1142.15 | eutectic: L -> Er2Ge5 + Ge | L: Ge 0.84; Er2Ge5: Ge 0.714286; Ge: Ge 1 | model | [1] Achgar 2017 | Table 2, p. 5, row 42; `ORC-Y5QLFJI2O6` |  |

## 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–Ge system (35)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Er11Ge10 | [Er11Ge10](https://data.orchid-project.org/compounds/Er11Ge10.html) | -94.3 kJ/mol-atom ± 2 | 950 | experimental | -81.13 (mp-aaacqmlg) | -80.917 (oqmd-665638) | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 10; `ORC-3Z7R6C4RJD.cdd980` |  |
| Er11Ge10 | [Er11Ge10](https://data.orchid-project.org/compounds/Er11Ge10.html) | -93.5 kJ/mol-atom | 950 | model | -81.13 (mp-aaacqmlg) | -80.917 (oqmd-665638) | [1] Achgar 2017 | Table 5, p. 7, row 12; `ORC-DMK2A4HOCV.e6f4e0` |  |
| Er11Ge10 | [Er11Ge10](https://data.orchid-project.org/compounds/Er11Ge10.html) | -93.37 kJ/mol-atom | 950 | model | -81.13 (mp-aaacqmlg) | -80.917 (oqmd-665638) | [1] Achgar 2017 | Table 5, p. 7, row 11; `ORC-PVPPX62X4W.8d1255` |  |
| Er2Ge5 | [Er2Ge5](https://data.orchid-project.org/compounds/Er2Ge5.html) | -65.51 kJ/mol-atom | 950 | model | -49.089 (mp-aaaabsbh) | -49.307 (oqmd-15631) | [1] Achgar 2017 | Table 5, p. 7, row 36; `ORC-I5EQ4TGMRH.6f2ba9` |  |
| Er2Ge5 | [Er2Ge5](https://data.orchid-project.org/compounds/Er2Ge5.html) | -65.4 kJ/mol-atom | 950 | model | -49.089 (mp-aaaabsbh) | -49.307 (oqmd-15631) | [1] Achgar 2017 | Table 5, p. 7, row 35; `ORC-5R7H6TC6SX.089502` |  |
| Er2Ge5 | [Er2Ge5](https://data.orchid-project.org/compounds/Er2Ge5.html) | -59.6 kJ/mol-atom ± 0.9 | 950 | experimental | -49.089 (mp-aaaabsbh) | -49.307 (oqmd-15631) | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 34; `ORC-O4EBHRWJPH.a77244` |  |
| Er3Ge4 | [Er3Ge4](https://data.orchid-project.org/compounds/Er3Ge4.html) | -88.28 kJ/mol-atom | 950 | model | -74.125 (mp-aaaaacnv) | -74.277 (oqmd-14536) | [1] Achgar 2017 | Table 5, p. 7, row 18; `ORC-LEEKSM6VFT.3bbdb0` |  |
| Er3Ge4 | [Er3Ge4](https://data.orchid-project.org/compounds/Er3Ge4.html) | -88.09 kJ/mol-atom | 950 | model | -74.125 (mp-aaaaacnv) | -74.277 (oqmd-14536) | [1] Achgar 2017 | Table 5, p. 7, row 17; `ORC-TSASEHRNZ3.808a48` |  |
| Er3Ge4 | [Er3Ge4](https://data.orchid-project.org/compounds/Er3Ge4.html) | -85.9 kJ/mol-atom ± 1.4 | 950 | experimental | -74.125 (mp-aaaaacnv) | -74.277 (oqmd-14536) | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 16; `ORC-CAIUJ7QU3I.fb6c37` |  |
| Er5Ge3 | [Er5Ge3](https://data.orchid-project.org/compounds/Er5Ge3.html) | -95.6 kJ/mol-atom ± 2 | 298.15 | experimental | -77.425 (mp-aaaaarny) | -77.604 (oqmd-18316) | [1] Achgar 2017; _cites Meschel 1997_ [doi](https://doi.org/10.1051/jcp/1997940928) | Table 5, p. 7, row 2; `ORC-74LJYQRGXZ` |  |
| Er5Ge3 | [Er5Ge3](https://data.orchid-project.org/compounds/Er5Ge3.html) | -95.2 kJ/mol-atom ± 2.7 | 950 | experimental | -77.425 (mp-aaaaarny) | -77.604 (oqmd-18316) | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 1; `ORC-ZCGU4EWHFR.5b8f3e` |  |
| Er5Ge3 | [Er5Ge3](https://data.orchid-project.org/compounds/Er5Ge3.html) | -91.88 kJ/mol-atom | 950 | model | -77.425 (mp-aaaaarny) | -77.604 (oqmd-18316) | [1] Achgar 2017 | Table 5, p. 7, row 6; `ORC-XNQMZE7OZB.298245` |  |
| Er5Ge3 | [Er5Ge3](https://data.orchid-project.org/compounds/Er5Ge3.html) | -91.45 kJ/mol-atom | 950 | model | -77.425 (mp-aaaaarny) | -77.604 (oqmd-18316) | [1] Achgar 2017 | Table 5, p. 7, row 5; `ORC-YABCFDBPNR.8938d1` |  |
| Er5Ge3 | [Er5Ge3](https://data.orchid-project.org/compounds/Er5Ge3.html) | -75 kJ/mol-atom |  | model | -77.425 (mp-aaaaarny) | -77.604 (oqmd-18316) | [1] Achgar 2017; _cites A 1983_ | Table 5, p. 7, row 3; `ORC-ARUIXUMUZK` |  |
| Er5Ge4 | [Er5Ge4](https://data.orchid-project.org/compounds/Er5Ge4.html) | -94.8 kJ/mol-atom ± 2.2 | 950 | experimental | -81.76 (mp-aaacqbaq) | -82.178 (oqmd-665639) | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 7; `ORC-SJMNJSI46L.1f8d81` |  |
| Er5Ge4 | [Er5Ge4](https://data.orchid-project.org/compounds/Er5Ge4.html) | -92.97 kJ/mol-atom | 950 | model | -81.76 (mp-aaacqbaq) | -82.178 (oqmd-665639) | [1] Achgar 2017 | Table 5, p. 7, row 9; `ORC-7WSVPZ2VU5.c79248` |  |
| Er5Ge4 | [Er5Ge4](https://data.orchid-project.org/compounds/Er5Ge4.html) | -92.81 kJ/mol-atom | 950 | model | -81.76 (mp-aaacqbaq) | -82.178 (oqmd-665639) | [1] Achgar 2017 | Table 5, p. 7, row 8; `ORC-K7ANMDCCXJ.b73b7e` |  |
| ErGe | [ErGe](https://data.orchid-project.org/compounds/ErGe.html) | -94.15 kJ/mol-atom | 950 | model | -82.273 (mp-aaaaadjc) | -82.483 (oqmd-7744) | [1] Achgar 2017 | Table 5, p. 7, row 15; `ORC-6YOAJNR3E4.4ada7b` |  |
| ErGe | [ErGe](https://data.orchid-project.org/compounds/ErGe.html) | -93.66 kJ/mol-atom | 950 | model | -82.273 (mp-aaaaadjc) | -82.483 (oqmd-7744) | [1] Achgar 2017 | Table 5, p. 7, row 14; `ORC-O2QYX4WSUG.514fe0` |  |
| ErGe | [ErGe](https://data.orchid-project.org/compounds/ErGe.html) | -92.2 kJ/mol-atom ± 1.8 | 950 | experimental | -82.273 (mp-aaaaadjc) | -82.483 (oqmd-7744) | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 13; `ORC-EH46YZZVT7.d0e788` |  |
| HT_Er2Ge3 | [Er2Ge3](https://data.orchid-project.org/compounds/Er2Ge3.html) | -84.13 kJ/mol-atom | 950 | model | -44.391 (mp-aaacrtbd) |  | [1] Achgar 2017 | Table 5, p. 7, row 24; `ORC-ACXKXPR5PP.10bd05` |  |
| HT_Er2Ge3 | [Er2Ge3](https://data.orchid-project.org/compounds/Er2Ge3.html) | -83.93 kJ/mol-atom | 950 | model | -44.391 (mp-aaacrtbd) |  | [1] Achgar 2017 | Table 5, p. 7, row 23; `ORC-PZS4R537IA.22fde7` |  |
| HT_Er2Ge3 | [Er2Ge3](https://data.orchid-project.org/compounds/Er2Ge3.html) | -83.4 kJ/mol-atom ± 1.3 | 950 | experimental | -44.391 (mp-aaacrtbd) |  | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 22; `ORC-LPVBNOE2IG.b2bd30` |  |
| HT_ErGe2 | [ErGe2](https://data.orchid-project.org/compounds/ErGe2.html) | -73.63 kJ/mol-atom | 950 | model |  | -27.011 (oqmd-1591438) | [1] Achgar 2017 | Table 5, p. 7, row 33; `ORC-DIWZHZFXLD.c0cc36` |  |
| HT_ErGe2 | [ErGe2](https://data.orchid-project.org/compounds/ErGe2.html) | -73.51 kJ/mol-atom | 950 | model |  | -27.011 (oqmd-1591438) | [1] Achgar 2017 | Table 5, p. 7, row 32; `ORC-TUA5HIYR7G.de8cfc` |  |
| HT_ErGe2 | [ErGe2](https://data.orchid-project.org/compounds/ErGe2.html) | -69.5 kJ/mol-atom ± 1 | 950 | experimental |  | -27.011 (oqmd-1591438) | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 31; `ORC-VL7CG4ITOP.efa0f8` |  |
| LT_Er2Ge3 | [Er2Ge3](https://data.orchid-project.org/compounds/Er2Ge3.html) | -84.23 kJ/mol-atom | 950 | model | -44.391 (mp-aaacrtbd) |  | [1] Achgar 2017 | Table 5, p. 7, row 21; `ORC-RHY3T5V3A4.68823a` |  |
| LT_Er2Ge3 | [Er2Ge3](https://data.orchid-project.org/compounds/Er2Ge3.html) | -84.05 kJ/mol-atom | 950 | model | -44.391 (mp-aaacrtbd) |  | [1] Achgar 2017 | Table 5, p. 7, row 20; `ORC-Q7FLMQBHKU.b4289b` |  |
| LT_Er2Ge3 | [Er2Ge3](https://data.orchid-project.org/compounds/Er2Ge3.html) | -83.4 kJ/mol-atom ± 1.3 | 950 | experimental | -44.391 (mp-aaacrtbd) |  | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 19; `ORC-DQF45FYYVS.83d1a6` |  |
| LT_ErGe2 | [ErGe2](https://data.orchid-project.org/compounds/ErGe2.html) | -73.95 kJ/mol-atom | 950 | model |  | -27.011 (oqmd-1591438) | [1] Achgar 2017 | Table 5, p. 7, row 27; `ORC-NEELESJRBU.4d105e` |  |
| LT_ErGe2 | [ErGe2](https://data.orchid-project.org/compounds/ErGe2.html) | -73.87 kJ/mol-atom | 950 | model |  | -27.011 (oqmd-1591438) | [1] Achgar 2017 | Table 5, p. 7, row 26; `ORC-5HJJYFZRTZ.59e85c` |  |
| LT_ErGe2 | [ErGe2](https://data.orchid-project.org/compounds/ErGe2.html) | -69.5 kJ/mol-atom ± 1 | 950 | experimental |  | -27.011 (oqmd-1591438) | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 25; `ORC-2T3W5BF2L4.fa9982` |  |
| MT_ErGe2 | [ErGe2](https://data.orchid-project.org/compounds/ErGe2.html) | -73.88 kJ/mol-atom | 950 | model |  | -27.011 (oqmd-1591438) | [1] Achgar 2017 | Table 5, p. 7, row 30; `ORC-MNXVKCIQTN.ea5a04` |  |
| MT_ErGe2 | [ErGe2](https://data.orchid-project.org/compounds/ErGe2.html) | -73.87 kJ/mol-atom | 950 | model |  | -27.011 (oqmd-1591438) | [1] Achgar 2017 | Table 5, p. 7, row 29; `ORC-5NCTUBP7YY.90dfe7` |  |
| MT_ErGe2 | [ErGe2](https://data.orchid-project.org/compounds/ErGe2.html) | -69.5 kJ/mol-atom ± 1 | 950 | experimental |  | -27.011 (oqmd-1591438) | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 28; `ORC-AIUQQK7SCB.dddc5f` |  |

## Other properties

### Phase transition (15)

Table: Phase transition, Er–Ge system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1180.15 K | 1180.15 | polymorphic: LT_ErGe2 -> MT_ErGe2; _LT_ErGe2: Ge 0.66; MT_ErGe2: Ge 0.666667_ | model | [1] Achgar 2017 | Table 2, p. 5, row 27; `ORC-IVEYX54RXL` |  |
| Phase transition | 1180.15 K | 1180.15 | polymorphic: LT_ErGe2 -> MT_ErGe2; _LT_ErGe2: Ge 0.66; MT_ErGe2: Ge 0.666667_ | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 25; `ORC-M4O2SF7JAY` |  |
| Phase transition | 1181.15 K | 1181.15 | polymorphic: LT_ErGe2 -> MT_ErGe2; _LT_ErGe2: Ge 0.66; MT_ErGe2: Ge 0.666667_ | model | [1] Achgar 2017 | Table 2, p. 5, row 26; `ORC-BLZSSAL5VH` |  |
| Phase transition | 1205.15 K | 1205.15 | polymorphic: MT_ErGe2 -> HT_ErGe2; _MT_ErGe2: Ge 0.66; HT_ErGe2: Ge 0.666667_ | model | [1] Achgar 2017 | Table 2, p. 5, row 30; `ORC-AM3RMBQA2L` |  |
| Phase transition | 1205.15 K | 1205.15 | polymorphic: MT_ErGe2 -> HT_ErGe2; _MT_ErGe2: Ge 0.66; HT_ErGe2: Ge 0.666667_ | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 28; `ORC-GXU74KI3SD` |  |
| Phase transition | 1205.15 K | 1205.15 | polymorphic: MT_ErGe2 -> HT_ErGe2; _MT_ErGe2: Ge 0.66; HT_ErGe2: Ge 0.666667_ | model | [1] Achgar 2017 | Table 2, p. 5, row 29; `ORC-YIRVMKAGKR` |  |
| Phase transition | 1216.15 K | 1216.15 | polymorphic: LT_Er2Ge3 -> HT_Er2Ge3; _LT_Er2Ge3: Ge 0.6; HT_Er2Ge3: Ge 0.6_ | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 22; `ORC-DNJVWAHFKB` |  |
| Phase transition | 1216.15 K | 1216.15 | polymorphic: LT_Er2Ge3 -> HT_Er2Ge3; _LT_Er2Ge3: Ge 0.6; HT_Er2Ge3: Ge 0.6_ | model | [1] Achgar 2017 | Table 2, p. 5, row 24; `ORC-EH2DBPTIJQ` |  |
| Phase transition | 1216.15 K | 1216.15 | polymorphic: LT_Er2Ge3 -> HT_Er2Ge3; _LT_Er2Ge3: Ge 0.6; HT_Er2Ge3: Ge 0.6_ | model | [1] Achgar 2017 | Table 2, p. 5, row 23; `ORC-T6U4G4BJKC` |  |
| Phase transition | 1802.15 K | 1802.15 | congruent melting: L -> Er; _L: Ge 0_ | model | [1] Achgar 2017 | Table 2, p. 5, row 2; `ORC-EM3KVNFX6V` |  |
| Phase transition | 1802.15 K | 1802.15 | congruent melting: L -> Er; _L: Ge 0_ | model | [1] Achgar 2017 | Table 2, p. 5, row 3; `ORC-PMKCCZ7PNY` |  |
| Phase transition | 1802.15 K | 1802.15 | congruent melting: L -> Er; _L: Ge 0_ | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 1; `ORC-ZNIT6OFX7B` |  |
| Phase transition | 2221.15 K | 2221.15 | congruent melting: L -> Er5Ge3; _L: Ge 0.375; Er5Ge3: Ge 0.375_ | model | [1] Achgar 2017 | Table 2, p. 5, row 8; `ORC-MRYM5JE7FD` |  |
| Phase transition | 2223.15 K | 2223.15 | congruent melting: L -> Er5Ge3; _L: Ge 0.375; Er5Ge3: Ge 0.375_ | experimental | [1] Achgar 2017; _cites Eremenko 1981_ | Table 2, p. 5, row 7; `ORC-WBNRTBK2YV` |  |
| Phase transition | 2227.15 K | 2227.15 | congruent melting: L -> Er5Ge3; _L: Ge 0.375; Er5Ge3: Ge 0.375_ | model | [1] Achgar 2017 | Table 2, p. 5, row 9; `ORC-G3FMSSVS3B` |  |

### Formation (63)

Table: Formation, Er–Ge system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Entropy of formation | -3.08 J/mol-atom/K |  | Er5Ge3; _alloy: Ge 0.375_ | model | [1] Achgar 2017; _cites Safonov 1985_ | Table 5, p. 7, row 4; `ORC-K7P4ZM4VQ7` |  |
| Entropy of formation | -17.9 J/mol-atom/K ± 1.7 | 950 | Er11Ge10; _alloy: Ge 0.47619_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 10; `ORC-3Z7R6C4RJD.935b17` |  |
| Entropy of formation | -1.47 J/mol-atom/K | 950 | Er11Ge10; _alloy: Ge 0.47619_ | model | [1] Achgar 2017 | Table 5, p. 7, row 12; `ORC-DMK2A4HOCV.493875` |  |
| Entropy of formation | -1.5 J/mol-atom/K | 950 | Er11Ge10; _alloy: Ge 0.47619_ | model | [1] Achgar 2017 | Table 5, p. 7, row 11; `ORC-PVPPX62X4W.dc5506` |  |
| Entropy of formation | -3.71 J/mol-atom/K | 950 | Er2Ge5; _alloy: Ge 0.714286_ | model | [1] Achgar 2017 | Table 5, p. 7, row 35; `ORC-5R7H6TC6SX.a51585` |  |
| Entropy of formation | -3.7 J/mol-atom/K | 950 | Er2Ge5; _alloy: Ge 0.714286_ | model | [1] Achgar 2017 | Table 5, p. 7, row 36; `ORC-I5EQ4TGMRH.9bc6b3` |  |
| Entropy of formation | -11.7 J/mol-atom/K ± 0.9 | 950 | Er2Ge5; _alloy: Ge 0.714286_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 34; `ORC-O4EBHRWJPH.fc5329` |  |
| Entropy of formation | -16.7 J/mol-atom/K ± 1.4 | 950 | Er3Ge4; _alloy: Ge 0.571429_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 16; `ORC-CAIUJ7QU3I.96b3f8` |  |
| Entropy of formation | -2.38 J/mol-atom/K | 950 | Er3Ge4; _alloy: Ge 0.571429_ | model | [1] Achgar 2017 | Table 5, p. 7, row 18; `ORC-LEEKSM6VFT.683f42` |  |
| Entropy of formation | -2.97 J/mol-atom/K | 950 | Er5Ge3; _alloy: Ge 0.375_ | model | [1] Achgar 2017 | Table 5, p. 7, row 6; `ORC-XNQMZE7OZB.a532a0` |  |
| Entropy of formation | -2.96 J/mol-atom/K | 950 | Er5Ge3; _alloy: Ge 0.375_ | model | [1] Achgar 2017 | Table 5, p. 7, row 5; `ORC-YABCFDBPNR.74458c` |  |
| Entropy of formation | -17.6 J/mol-atom/K ± 1.6 | 950 | Er5Ge3; _alloy: Ge 0.375_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 1; `ORC-ZCGU4EWHFR.b15613` |  |
| Entropy of formation | -1.14 J/mol-atom/K | 950 | Er5Ge4; _alloy: Ge 0.444444_ | model | [1] Achgar 2017 | Table 5, p. 7, row 9; `ORC-7WSVPZ2VU5.4c5963` |  |
| Entropy of formation | -17.8 J/mol-atom/K ± 1.8 | 950 | Er5Ge4; _alloy: Ge 0.444444_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 7; `ORC-SJMNJSI46L.f288fc` |  |
| Entropy of formation | -2.68 J/mol-atom/K | 950 | ErGe; _alloy: Ge 0.5_ | model | [1] Achgar 2017 | Table 5, p. 7, row 15; `ORC-6YOAJNR3E4.ba8d28` |  |
| Entropy of formation | -17.6 J/mol-atom/K ± 1.6 | 950 | ErGe; _alloy: Ge 0.5_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 13; `ORC-EH46YZZVT7.5a6b1b` |  |
| Entropy of formation | -2.49 J/mol-atom/K | 950 | ErGe; _alloy: Ge 0.5_ | model | [1] Achgar 2017 | Table 5, p. 7, row 14; `ORC-O2QYX4WSUG.16e7ef` |  |
| Entropy of formation | -1.08 J/mol-atom/K | 950 | HT_Er2Ge3; _alloy: Ge 0.6_ | model | [1] Achgar 2017 | Table 5, p. 7, row 24; `ORC-ACXKXPR5PP.0a53f9` |  |
| Entropy of formation | -16.3 J/mol-atom/K ± 1.3 | 950 | HT_Er2Ge3; _alloy: Ge 0.6_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 22; `ORC-LPVBNOE2IG.28028b` |  |
| Entropy of formation | -2.05 J/mol-atom/K | 950 | HT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 33; `ORC-DIWZHZFXLD.13bc22` |  |
| Entropy of formation | -2.07 J/mol-atom/K | 950 | HT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 32; `ORC-TUA5HIYR7G.6ca990` |  |
| Entropy of formation | -13.6 J/mol-atom/K ± 1.1 | 950 | HT_ErGe2; _alloy: Ge 0.666667_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 31; `ORC-VL7CG4ITOP.c5771e` |  |
| Entropy of formation | -16.3 J/mol-atom/K ± 1.3 | 950 | LT_Er2Ge3; _alloy: Ge 0.6_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 19; `ORC-DQF45FYYVS.9e8b35` |  |
| Entropy of formation | -1.18 J/mol-atom/K | 950 | LT_Er2Ge3; _alloy: Ge 0.6_ | model | [1] Achgar 2017 | Table 5, p. 7, row 20; `ORC-Q7FLMQBHKU.19db17` |  |
| Entropy of formation | -1.16 J/mol-atom/K | 950 | LT_Er2Ge3; _alloy: Ge 0.6_ | model | [1] Achgar 2017 | Table 5, p. 7, row 21; `ORC-RHY3T5V3A4.de31c7` |  |
| Entropy of formation | -13.6 J/mol-atom/K ± 1.1 | 950 | LT_ErGe2; _alloy: Ge 0.666667_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 25; `ORC-2T3W5BF2L4.0b52b8` |  |
| Entropy of formation | -2.37 J/mol-atom/K | 950 | LT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 26; `ORC-5HJJYFZRTZ.983636` |  |
| Entropy of formation | -2.36 J/mol-atom/K | 950 | MT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 29; `ORC-5NCTUBP7YY.8e8864` |  |
| Entropy of formation | -13.6 J/mol-atom/K ± 1.1 | 950 | MT_ErGe2; _alloy: Ge 0.666667_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 28; `ORC-AIUQQK7SCB.e81c14` |  |
| Entropy of formation | -2.26 J/mol-atom/K | 950 | MT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 30; `ORC-MNXVKCIQTN.b5f734` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -77.32 kJ/mol-atom ± 0.16 | 950 | Er11Ge10; _alloy: Ge 0.47619_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 10; `ORC-3Z7R6C4RJD.fc409f` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -92.1 kJ/mol-atom | 950 | Er11Ge10; _alloy: Ge 0.47619_ | model | [1] Achgar 2017 | Table 5, p. 7, row 12; `ORC-DMK2A4HOCV.ae4af2` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -91.95 kJ/mol-atom | 950 | Er11Ge10; _alloy: Ge 0.47619_ | model | [1] Achgar 2017 | Table 5, p. 7, row 11; `ORC-PVPPX62X4W.88d7f1` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -61.87 kJ/mol-atom | 950 | Er2Ge5; _alloy: Ge 0.714286_ | model | [1] Achgar 2017 | Table 5, p. 7, row 35; `ORC-5R7H6TC6SX.72db64` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -61.99 kJ/mol-atom | 950 | Er2Ge5; _alloy: Ge 0.714286_ | model | [1] Achgar 2017 | Table 5, p. 7, row 36; `ORC-I5EQ4TGMRH.f8a1d1` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -48.47 kJ/mol-atom ± 0.08 | 950 | Er2Ge5; _alloy: Ge 0.714286_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 34; `ORC-O4EBHRWJPH.2ba01d` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -70.04 kJ/mol-atom ± 0.13 | 950 | Er3Ge4; _alloy: Ge 0.571429_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 16; `ORC-CAIUJ7QU3I.af9293` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -86.01 kJ/mol-atom | 950 | Er3Ge4; _alloy: Ge 0.571429_ | model | [1] Achgar 2017 | Table 5, p. 7, row 18; `ORC-LEEKSM6VFT.8d51e3` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -85.83 kJ/mol-atom | 950 | Er3Ge4; _alloy: Ge 0.571429_ | model | [1] Achgar 2017 | Table 5, p. 7, row 17; `ORC-TSASEHRNZ3.6c848a` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -89.05 kJ/mol-atom | 950 | Er5Ge3; _alloy: Ge 0.375_ | model | [1] Achgar 2017 | Table 5, p. 7, row 6; `ORC-XNQMZE7OZB.c0d2fa` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -88.63 kJ/mol-atom | 950 | Er5Ge3; _alloy: Ge 0.375_ | model | [1] Achgar 2017 | Table 5, p. 7, row 5; `ORC-YABCFDBPNR.e4f3b7` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -78.4 kJ/mol-atom ± 0.22 | 950 | Er5Ge3; _alloy: Ge 0.375_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 1; `ORC-ZCGU4EWHFR.835c64` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -91.88 kJ/mol-atom | 950 | Er5Ge4; _alloy: Ge 0.444444_ | model | [1] Achgar 2017 | Table 5, p. 7, row 9; `ORC-7WSVPZ2VU5.325137` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -91.72 kJ/mol-atom | 950 | Er5Ge4; _alloy: Ge 0.444444_ | model | [1] Achgar 2017 | Table 5, p. 7, row 8; `ORC-K7ANMDCCXJ.1b4a45` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -77.91 kJ/mol-atom ± 0.18 | 950 | Er5Ge4; _alloy: Ge 0.444444_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 7; `ORC-SJMNJSI46L.3a1910` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -91.6 kJ/mol-atom | 950 | ErGe; _alloy: Ge 0.5_ | model | [1] Achgar 2017 | Table 5, p. 7, row 15; `ORC-6YOAJNR3E4.769a1e` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -75.5 kJ/mol-atom ± 0.16 | 950 | ErGe; _alloy: Ge 0.5_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 13; `ORC-EH46YZZVT7.7340ac` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -91.29 kJ/mol-atom | 950 | ErGe; _alloy: Ge 0.5_ | model | [1] Achgar 2017 | Table 5, p. 7, row 14; `ORC-O2QYX4WSUG.69810d` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -83.1 kJ/mol-atom | 950 | HT_Er2Ge3; _alloy: Ge 0.6_ | model | [1] Achgar 2017 | Table 5, p. 7, row 24; `ORC-ACXKXPR5PP.35646e` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -67.86 kJ/mol-atom ± 0.12 | 950 | HT_Er2Ge3; _alloy: Ge 0.6_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 22; `ORC-LPVBNOE2IG.61f1dc` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -82.9 kJ/mol-atom | 950 | HT_Er2Ge3; _alloy: Ge 0.6_ | model | [1] Achgar 2017 | Table 5, p. 7, row 23; `ORC-PZS4R537IA.13e33b` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -71.68 kJ/mol-atom | 950 | HT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 33; `ORC-DIWZHZFXLD.e04f7c` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -71.54 kJ/mol-atom | 950 | HT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 32; `ORC-TUA5HIYR7G.d1555d` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -56.55 kJ/mol-atom ± 0.1 | 950 | HT_ErGe2; _alloy: Ge 0.666667_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 31; `ORC-VL7CG4ITOP.fc705a` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -67.86 kJ/mol-atom ± 0.12 | 950 | LT_Er2Ge3; _alloy: Ge 0.6_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 19; `ORC-DQF45FYYVS.ab0d4a` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -82.92 kJ/mol-atom | 950 | LT_Er2Ge3; _alloy: Ge 0.6_ | model | [1] Achgar 2017 | Table 5, p. 7, row 20; `ORC-Q7FLMQBHKU.b15b76` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -83.12 kJ/mol-atom | 950 | LT_Er2Ge3; _alloy: Ge 0.6_ | model | [1] Achgar 2017 | Table 5, p. 7, row 21; `ORC-RHY3T5V3A4.a62a73` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -56.55 kJ/mol-atom ± 0.1 | 950 | LT_ErGe2; _alloy: Ge 0.666667_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 25; `ORC-2T3W5BF2L4.4e597c` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -71.61 kJ/mol-atom | 950 | LT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 26; `ORC-5HJJYFZRTZ.c7f3e6` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -71.69 kJ/mol-atom | 950 | LT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 27; `ORC-NEELESJRBU.d2b1c8` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -71.62 kJ/mol-atom | 950 | MT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 29; `ORC-5NCTUBP7YY.acd33b` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -56.55 kJ/mol-atom ± 0.1 | 950 | MT_ErGe2; _alloy: Ge 0.666667_ | experimental | [1] Achgar 2017; _cites Sidorko 2008_ | Table 5, p. 7, row 28; `ORC-AIUQQK7SCB.65be9e` |  |
| Gibbs energy of formation; _printed: Gibbs free Energy_ | -71.73 kJ/mol-atom | 950 | MT_ErGe2; _alloy: Ge 0.666667_ | model | [1] Achgar 2017 | Table 5, p. 7, row 30; `ORC-MNXVKCIQTN.c27dd9` |  |

## Sources

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

1. Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017). [doi:10.1016/j.jallcom.2017.07.129](https://doi.org/10.1016/j.jallcom.2017.07.129)

## 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/).