# Au–Ho system

> Au–Ho system: 67 accepted literature values (invariant reaction 26, crystal structure 20, formation 19, phase transition 2) and 1 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/AU-HO.html · Markdown: https://data.orchid-project.org/systems/AU-HO.md

67 accepted literature values from 1 paper(s) (experimental 37, model 23, DFT 7); 1 calculated phase diagram(s). 1 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/AU-HO.json) · [CSV](https://data.orchid-project.org/systems/AU-HO.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#AU-HO) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#AU-HO/AuHo-12Don.json) · [phases (13)](https://data.orchid-project.org/phases/pages/AU-HO.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/AU-HO.html) · [Markdown](https://data.orchid-project.org/systems/AU-HO.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 37 |
| model | 23 |
| DFT | 7 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 26 |
| phase transition | 2 |
| formation | 19 |
| crystal structure | 20 |

## 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 |
|---|---|---|---|
| AuHo-12Don.tdb | H.Q. Dong, X.M. Tao, T. Laurila, M. Paulastro-Krockel, Calphad, 37, 87-93(2012). [doi:10.1016/j.calphad.2012.02.002](https://doi.org/10.1016/j.calphad.2012.02.002) | `6ea84ad1f6ea5862fe4109d63bd80128c8f0057346ff05092e98d47f66cd9622` | [viewer](https://orchid-project.org/phase-diagrams/#AU-HO/AuHo-12Don.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/AuHo-12Don.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/AuHo-12Don.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| AuHo-12Don.tdb | 1885.78 | AUHO_B33 (x(Ho) 0.5) + AUHO_B2 (x(Ho) 0.5) + LIQUID (x(Ho) 0.54497) |
| AuHo-12Don.tdb | 1885.78 | LIQUID (x(Ho) 0.45729) + AUHO_B33 (x(Ho) 0.5) + AUHO_B2 (x(Ho) 0.5) |
| AuHo-12Don.tdb | 1621.8 | LIQUID (x(Ho) 0.37714) + AU10HO7 (x(Ho) 0.41176) + AUHO_B33 (x(Ho) 0.5) |
| AuHo-12Don.tdb | 1621.8 | LIQUID (x(Ho) 0.3773) + AU10HO7 (x(Ho) 0.41176) + AUHO_B33 (x(Ho) 0.5) |
| AuHo-12Don.tdb | 1593.46 | AU2HO_C11B (x(Ho) 0.33333) + LIQUID (x(Ho) 0.36103) + AU10HO7 (x(Ho) 0.41176) |
| AuHo-12Don.tdb | 1593.46 | AU2HO_C11B (x(Ho) 0.33333) + LIQUID (x(Ho) 0.36093) + AU10HO7 (x(Ho) 0.41176) |
| AuHo-12Don.tdb | 1593.46 | AU2HO_C11B (x(Ho) 0.33333) + LIQUID (x(Ho) 0.36118) + AU10HO7 (x(Ho) 0.41176) |
| AuHo-12Don.tdb | 1510.89 | AU3HO_D0A (x(Ho) 0.25) + LIQUID (x(Ho) 0.26737) + AU2HO_C11B (x(Ho) 0.33333) |
| AuHo-12Don.tdb | 1375.3 | AUHO_B33 (x(Ho) 0.5) + AUHO2_C37 (x(Ho) 0.66667) + LIQUID (x(Ho) 0.70726) |
| AuHo-12Don.tdb | 1375.29 | AUHO_B33 (x(Ho) 0.5) + AUHO2_C37 (x(Ho) 0.66667) + LIQUID (x(Ho) 0.70752) |
| AuHo-12Don.tdb | 1333.26 | LIQUID (x(Ho) 0.17177) + AU51HO14 (x(Ho) 0.21538) + AU3HO_D0A (x(Ho) 0.25) |
| AuHo-12Don.tdb | 1333.26 | LIQUID (x(Ho) 0.17183) + AU51HO14 (x(Ho) 0.21538) + AU3HO_D0A (x(Ho) 0.25) |
| AuHo-12Don.tdb | 1245.73 | AUHO2_C37 (x(Ho) 0.66667) + LIQUID (x(Ho) 0.80156) + HCP_A3 (x(Ho) 0.99197) |
| AuHo-12Don.tdb | 1245.73 | AUHO2_C37 (x(Ho) 0.66667) + LIQUID (x(Ho) 0.80159) + HCP_A3 (x(Ho) 0.99197) |
| AuHo-12Don.tdb | 1223.25 | LIQUID (x(Ho) 0.14067) + AU4HO_D1A (x(Ho) 0.2) + AU51HO14 (x(Ho) 0.21538) |
| AuHo-12Don.tdb | 1223.25 | LIQUID (x(Ho) 0.14064) + AU4HO_D1A (x(Ho) 0.2) + AU51HO14 (x(Ho) 0.21538) |
| AuHo-12Don.tdb | 1223.25 | LIQUID (x(Ho) 0.14068) + AU4HO_D1A (x(Ho) 0.2) + AU51HO14 (x(Ho) 0.21538) |
| AuHo-12Don.tdb | 1119.28 | LIQUID (x(Ho) 0.11734) + AU6HO (x(Ho) 0.14286) + AU4HO_D1A (x(Ho) 0.2) |
| AuHo-12Don.tdb | 1119.28 | LIQUID (x(Ho) 0.11734) + AU6HO (x(Ho) 0.14286) + AU4HO_D1A (x(Ho) 0.2) |
| AuHo-12Don.tdb | 1075.55 | FCC_A1 (x(Ho) 0.05485) + LIQUID (x(Ho) 0.10059) + AU6HO (x(Ho) 0.14286) |

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

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the Au–Ho system (26)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 1974 | congruent melting: L \<=> beta AuHo | L: Au 0.5, Ho 0.5; beta AuHo: Au 0.5, Ho 0.5 | model | [1] Dong 2012 | Table 2, p. 3, row 6; `ORC-VDFCRW6ZSV` |  |
| 1973 | congruent melting: L \<=> beta AuHo | L: Au 0.5; beta AuHo: Au 0.5, Ho 0.5 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 5; `ORC-EXIW3RO6KX` |  |
| 1886 | polymorphic: beta AuLa \<=> alpha AuHo | beta AuLa: Au 0.5, Ho 0.5; alpha AuHo: Au 0.5, Ho 0.5 | model | [1] Dong 2012 | Table 2, p. 3, row 8; `ORC-NAINT3ZASC` |  |
| 1883 | polymorphic: beta AuLa \<=> alpha AuHo | beta AuLa: Au 0.5, Ho 0.5; alpha AuHo: Au 0.5, Ho 0.5 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 7; `ORC-LO2FRMU5QV` |  |
| 1633 | L + alpha AuHo \<=> Au10Ho7 | L: Au 0.595; alpha AuHo: Au 0.5, Ho 0.5; Au10Ho7: Au 0.588235, Ho 0.411765 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 9; `ORC-MEY7DO3Z4P` |  |
| 1623 | congruent melting: L \<=> Au2Ho | L: Au 0.667; Au2Ho: Au 0.666667, Ho 0.333333 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 13; `ORC-EIV3X6JXJ3` |  |
| 1622 | L + alpha AuHo \<=> Au10Ho7 | L: Au 0.623; alpha AuHo: Au 0.5, Ho 0.5; Au10Ho7: Au 0.588235, Ho 0.411765 | model | [1] Dong 2012 | Table 2, p. 3, row 10; `ORC-6WCWYCBLG6` |  |
| 1609 | congruent melting: L \<=> Au2Ho | L: Au 0.666667, Ho 0.333333; Au2Ho: Au 0.666667, Ho 0.333333 | model | [1] Dong 2012 | Table 2, p. 3, row 14; `ORC-IDAJRFXG7W` |  |
| 1593 | L \<=> Au2Ho + Au10Ho7 | L: Au 0.639; Au2Ho: Au 0.666667, Ho 0.333333; Au10Ho7: Au 0.588235, Ho 0.411765 | model | [1] Dong 2012 | Table 2, p. 3, row 12; `ORC-3SNJ3LD7AY` |  |
| 1558 | L \<=> Au2Ho + Au10Ho7 | L: Au 0.615; Au2Ho: Au 0.666667, Ho 0.333333; Au10Ho7: Au 0.588235, Ho 0.411765 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 11; `ORC-CN5BSTXSTP` |  |
| 1523 | congruent melting: L \<=> Au3Ho | L: Au 0.75; Au3Ho: Au 0.75, Ho 0.25 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 17; `ORC-URRSJLECG7` |  |
| 1519 | congruent melting: L \<=> Au3Ho | L: Au 0.75, Ho 0.25; Au3Ho: Au 0.75, Ho 0.25 | model | [1] Dong 2012 | Table 2, p. 3, row 18; `ORC-L4J7CLHZ76` |  |
| 1510 | L \<=> Au2Ho + Au3Ho | L: Au 0.732; Au2Ho: Au 0.666667, Ho 0.333333; Au3Ho: Au 0.75, Ho 0.25 | model | [1] Dong 2012 | Table 2, p. 3, row 16; `ORC-SDEQDNVLOH` |  |
| 1503 | L \<=> Au2Ho + Au3Ho | L: Au 0.72; Au2Ho: Au 0.666667, Ho 0.333333; Au3Ho: Au 0.75, Ho 0.25 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 15; `ORC-PWFSQ6VZ3D` |  |
| 1378 | L + beta AuHo \<=> AuHo2 | L: Au 0.293; beta AuHo: Au 0.5, Ho 0.5; AuHo2: Au 0.333333, Ho 0.666667 | model | [1] Dong 2012 | Table 2, p. 3, row 4; `ORC-TA4B6UQXQL` |  |
| 1368 | L + beta AuHo \<=> AuHo2 | L: Au 0.3; beta AuHo: Au 0.5, Ho 0.5; AuHo2: Au 0.333333, Ho 0.666667 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 3; `ORC-5EEPFM63VP` |  |
| 1333 | L + Au3Ho \<=> Au51Ho14 | L: Au 0.825; Au3Ho: Au 0.75, Ho 0.25; Au51Ho14: Au 0.784615, Ho 0.215385 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 19; `ORC-2BYSUET7DU` |  |
| 1333 | L + Au3Ho \<=> Au51Ho14 | L: Au 0.828; Au3Ho: Au 0.75, Ho 0.25; Au51Ho14: Au 0.784615, Ho 0.215385 | model | [1] Dong 2012 | Table 2, p. 3, row 20; `ORC-3CRRDMTYEZ` |  |
| 1258 | L \<=> Ho (hcp) + AuHo2 | L: Au 0.22 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 1; `ORC-UFL53M2RGU` |  |
| 1248 | L \<=> Ho (hcp) + AuHo2 | L: Au 0.198; Ho (hcp): Au 0.008; AuHo2: Au 0.008 | model | [1] Dong 2012 | Table 2, p. 3, row 2; `ORC-JK5NJJCDBU` |  |
| 1224 | L + Au51Ho14 \<=> Au4Ho | L: Au 0.859; Au51Ho14: Au 0.784615, Ho 0.215385; Au4Ho: Au 0.8, Ho 0.2 | model | [1] Dong 2012 | Table 2, p. 3, row 22; `ORC-I2RHUZ4HFY` |  |
| 1223 | L + Au51Ho14 \<=> Au4Ho | L: Au 0.85; Au51Ho14: Au 0.784615, Ho 0.215385; Au4Ho: Au 0.8, Ho 0.2 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 21; `ORC-TI3ZKGYCBP` |  |
| 1115 | L + Au4Ho \<=> Au6Ho | L: Au 0.884; Au4Ho: Au 0.8, Ho 0.2; Au6Ho: Au 0.857143, Ho 0.142857 | model | [1] Dong 2012 | Table 2, p. 3, row 24; `ORC-KYNDOCBR6N` |  |
| 1113 | L + Au4Ho \<=> Au6Ho | L: Au 0.87; Au4Ho: Au 0.8, Ho 0.2; Au6Ho: Au 0.857143, Ho 0.142857 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 23; `ORC-OE2EXI2WES` |  |
| 1078 | L \<=> Au6Ho + Au(fcc) | L: Au 0.89; Au6Ho: Au 0.857143, Ho 0.142857; Au(fcc): Au 0.96 | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 2, p. 3, row 25; `ORC-Q46O2NS6GD` |  |
| 1074 | L \<=> Au6Ho + Au(fcc) | L: Au 0.899; Au6Ho: Au 0.857143, Ho 0.142857; Au(fcc): Au 0.945 | model | [1] Dong 2012 | Table 2, p. 3, row 26; `ORC-RFENRQXXJB` |  |

## 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, Au–Ho system (19)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| Au10Ho7 |  | -83.7 kJ/mol-atom | 298.15 | model |  |  | [1] Dong 2012 | Table 1, p. 2, row 15; `ORC-FDD536LPFV.231620` |  |
| Au2Ho |  | -85.4 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2012 | Table 1, p. 2, row 17; `ORC-OCL7SURRTK.2fa5cc` |  |
| Au2Ho | [Au2Ho](https://data.orchid-project.org/compounds/Au2Ho.html) | -84.6 kJ/mol-atom ± 1.4 | 298.15 | experimental | -84.473 (mp-aaaaabmc) | -84.636 (oqmd-1895423) | [1] Dong 2012; _cites Meschel 2004_ [doi](https://doi.org/10.1016/s0925-8388%2803%2900527-9) | Table 1, p. 2, row 18; `ORC-XILELDB44S.2bbebd` |  |
| Au2Ho | [Au2Ho](https://data.orchid-project.org/compounds/Au2Ho.html) | -81.3 kJ/mol-atom | 298.15 | model | -84.473 (mp-aaaaabmc) | -84.636 (oqmd-1895423) | [1] Dong 2012 | Table 1, p. 2, row 19; `ORC-PR36TYOZXW.9b8e30` |  |
| Au3Ho |  | -70.8 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2012 | Table 1, p. 2, row 21; `ORC-TJQHGQGW7H.89eb2e` |  |
| Au3Ho | [Au3Ho](https://data.orchid-project.org/compounds/Au3Ho.html) | -68.1 kJ/mol-atom | 298.15 | model | -69.705 (mp-aaaabsys) | -69.899 (oqmd-10739) | [1] Dong 2012 | Table 1, p. 2, row 23; `ORC-RYJDR7YAHO.63e770` |  |
| Au3Ho | [Au3Ho](https://data.orchid-project.org/compounds/Au3Ho.html) | -67.1 kJ/mol-atom ± 2.1 | 298.15 | experimental | -69.705 (mp-aaaabsys) | -69.899 (oqmd-10739) | [1] Dong 2012; _cites Meschel 2004_ [doi](https://doi.org/10.1016/s0925-8388%2803%2900527-9) | Table 1, p. 2, row 22; `ORC-7JD6XCXRB7.668c2f` |  |
| Au4Ho | [Au4Ho](https://data.orchid-project.org/compounds/Au4Ho.html) | -59.4 kJ/mol-atom | 298.15 | model | -57.779 (mp-aaaabsyt) | -57.636 (oqmd-10740) | [1] Dong 2012 | Table 1, p. 2, row 28; `ORC-KBAJN256VD.008b49` |  |
| Au4Ho |  | -58.5 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2012 | Table 1, p. 2, row 27; `ORC-4C2H5DKNQU.df194d` |  |
| Au51Ho14 |  | -63.1 kJ/mol-atom | 298.15 | model |  |  | [1] Dong 2012 | Table 1, p. 2, row 25; `ORC-5EUPG5IJYI.4e2753` |  |
| Au6Ho | [Au6Ho](https://data.orchid-project.org/compounds/Au6Ho.html) | -42.9 kJ/mol-atom | 298.15 | model | -40.545 (mp-aaacqgip) | -39.995 (oqmd-2052235) | [1] Dong 2012 | Table 1, p. 2, row 31; `ORC-PGXGPWK52S.627935` |  |
| Au6Ho |  | -40.8 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2012 | Table 1, p. 2, row 30; `ORC-Z6HK2MKFK7.80572b` |  |
| AuHo2 | [AuHo2](https://data.orchid-project.org/compounds/AuHo2.html) | -65.5 kJ/mol-atom | 298.15 | model | -62.097 (mp-aaaabsyr) | -62.432 (oqmd-10737) | [1] Dong 2012 | Table 1, p. 2, row 6; `ORC-OGX5W2SD4Q.83f791` |  |
| AuHo2 |  | -64.1 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2012 | Table 1, p. 2, row 5; `ORC-BVIBSC5UDH.5ac5cb` |  |
| αAuHo |  | -87.5 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2012 | Table 1, p. 2, row 8; `ORC-SYIRAZ7W22.68646e` |  |
| αAuHo | [AuHo](https://data.orchid-project.org/compounds/AuHo.html) | -86 kJ/mol-atom | 298.15 | model | -86.06 (mp-aaacfiqk) | -86.188 (oqmd-28172) | [1] Dong 2012 | Table 1, p. 2, row 10; `ORC-SIZPTWAGHY.6901bb` |  |
| αAuHo | [AuHo](https://data.orchid-project.org/compounds/AuHo.html) | -81.8 kJ/mol-atom ± 3.6 | 298.15 | experimental | -86.06 (mp-aaacfiqk) | -86.188 (oqmd-28172) | [1] Dong 2012; _cites Fitzner 1997_ [doi](https://doi.org/10.1007/s11661-997-0094-6) | Table 1, p. 2, row 9; `ORC-HV5YWBUZLU.7c0cf1` |  |
| βAuHo | [AuHo](https://data.orchid-project.org/compounds/AuHo.html) | -67.3 kJ/mol-atom | 298.15 | model | -86.06 (mp-aaacfiqk) | -86.188 (oqmd-28172) | [1] Dong 2012 | Table 1, p. 2, row 13; `ORC-3BCPC4TGIA.5097af` |  |
| βAuHo |  | -64.1 kJ/mol-atom | 0 | DFT |  |  | [1] Dong 2012 | Table 1, p. 2, row 12; `ORC-5X4G3I6N6D.4ba9e2` |  |

## Other properties

### Phase transition (2)

Table: Phase transition, Au–Ho system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1609 K | 1609 | congruent transformation | model | [1] Dong 2012 | p. 5; `ORC-X3N7UXAJY3.04e645` | “Therefore, the assessed congruent melting temperature for Au2 Ho (1609 K) is reasonable, compared to the proposed 1623 K.” |
| Phase transition | 1623 K | 1623 | congruent transformation | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | p. 5; `ORC-X3N7UXAJY3.7e1bd7` | “Therefore, the assessed congruent melting temperature for Au2 Ho (1609 K) is reasonable, compared to the proposed 1623 K.” |

### Crystal structure (20)

Table: Crystal structure, Au–Ho system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a; _printed: lattice parameter a_ | 10.21 Å | 298.15 | Au10Ho7; _alloy: Ho 0.411765_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 16; `ORC-352HUQWEPO.7c526c` |  |
| Lattice a; _printed: lattice parameter a_ | 3.677 Å | 298.15 | Au2Ho; _alloy: Ho 0.333333_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 20; `ORC-ZQWG6LAOIC.7e1390` |  |
| Lattice a; _printed: a_ | 6.057 Å | 298.15 | Au3Ho; _alloy: Ho 0.25_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 24; `ORC-LNBIV2T6B7.dd54dd` |  |
| Lattice a; _printed: lattice parameter a_ | 6.653 Å | 298.15 | Au4Ho; _alloy: Ho 0.2_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 29; `ORC-VRAD3Q6PIB.188432` |  |
| Lattice a; _printed: a_ | 12.55 Å | 298.15 | Au51Ho14; _alloy: Ho 0.215385_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 26; `ORC-JPEXYVQMGS.49ba97` |  |
| Lattice a; _printed: a_ | 10.29 Å | 298.15 | Au6Ho; _alloy: Ho 0.142857_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 32; `ORC-Z5XFX66DQ4.58db88` |  |
| Lattice a; _printed: lattice parameter a_ | 7.025 Å | 298.15 | AuHo2; _alloy: Ho 0.666667_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 7; `ORC-2FT2FXHLDL.373a90` |  |
| Lattice a; _printed: a_ | 3.685 Å | 298.15 | αAuHo; _alloy: Ho 0.5_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 11; `ORC-XJCFX5CKL6.1fde69` |  |
| Lattice a; _printed: lattice parameter a_ | 3.541 Å | 298.15 | βAuHo; _alloy: Ho 0.5_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 14; `ORC-VPNWDITUCP.a18653` |  |
| Lattice b; _printed: b_ | 4.964 Å | 298.15 | Au3Ho; _alloy: Ho 0.25_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 24; `ORC-LNBIV2T6B7.098e69` |  |
| Lattice b; _printed: lattice parameter b_ | 4.8922 Å | 298.15 | AuHo2; _alloy: Ho 0.666667_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 7; `ORC-2FT2FXHLDL.9294e1` |  |
| Lattice b; _printed: b_ | 10.835 Å | 298.15 | αAuHo; _alloy: Ho 0.5_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 11; `ORC-XJCFX5CKL6.71b2b0` |  |
| Lattice c; _printed: c_ | 27.72 Å | 298.15 | Au10Ho7; _alloy: Ho 0.411765_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 16; `ORC-352HUQWEPO.26f95f` |  |
| Lattice c; _printed: lattice parameter c_ | 8.94 Å | 298.15 | Au2Ho; _alloy: Ho 0.333333_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 20; `ORC-ZQWG6LAOIC.473b17` |  |
| Lattice c; _printed: c_ | 5.072 Å | 298.15 | Au3Ho; _alloy: Ho 0.25_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 24; `ORC-LNBIV2T6B7.5411a3` |  |
| Lattice c; _printed: c_ | 4.174 Å | 298.15 | Au4Ho; _alloy: Ho 0.2_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 29; `ORC-VRAD3Q6PIB.99ae09` |  |
| Lattice c; _printed: lattice parameter c_ | 9.135 Å | 298.15 | Au51Ho14; _alloy: Ho 0.215385_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 26; `ORC-JPEXYVQMGS.72eb4f` |  |
| Lattice c; _printed: c_ | 9.66 Å | 298.15 | Au6Ho; _alloy: Ho 0.142857_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 32; `ORC-Z5XFX66DQ4.188598` |  |
| Lattice c; _printed: lattice parameter c_ | 8.8482 Å | 298.15 | AuHo2; _alloy: Ho 0.666667_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 7; `ORC-2FT2FXHLDL.1e4a06` |  |
| Lattice c; _printed: c_ | 4.595 Å | 298.15 | αAuHo; _alloy: Ho 0.5_ | experimental | [1] Dong 2012; _cites Saccone 2002_ [doi](https://doi.org/10.1016/s0966-9795%2802%2900093-6) | Table 1, p. 2, row 11; `ORC-XJCFX5CKL6.61bda1` |  |

## Sources

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

1. H.Q. Dong, X.M. Tao, T. Laurila, M. Paulasto-Kröckel, Thermodynamic assessment of Au–Ho and Au–Tm binary systems, Calphad 37, 87-93 (2012). [doi:10.1016/j.calphad.2012.02.002](https://doi.org/10.1016/j.calphad.2012.02.002)

## 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/).