# Fe–Te system

> Fe–Te system: 56 accepted literature values (crystal structure 39, formation 16, phase transition 1) and 2 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

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

56 accepted literature values from 1 paper(s) (experimental 15, model 8, DFT 29, unspecified 4); 2 calculated phase diagram(s).

Data: [JSON](https://data.orchid-project.org/literature/systems/FE-TE.json) · [CSV](https://data.orchid-project.org/systems/FE-TE.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#FE-TE) · [interactive phase diagram](https://orchid-project.org/phase-diagrams/#FE-TE/FeTe-18Arv.json) · [phases (10)](https://data.orchid-project.org/phases/pages/FE-TE.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/FE-TE.html) · [Markdown](https://data.orchid-project.org/systems/FE-TE.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 15 |
| model | 8 |
| DFT | 29 |
| unspecified | 4 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| phase transition | 1 |
| formation | 16 |
| crystal structure | 39 |

## 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 |
|---|---|---|---|
| FeTe-18Arv.tdb | C.-M. Arvhult, C. Gueneau, S. Gosse, M. Selleby, J. Alloys Compd., 767, 883-93(2018). [doi:10.1016/j.jallcom.2018.07.051](https://doi.org/10.1016/j.jallcom.2018.07.051) | `3c9d8dd7e2fb409823bf126986510115290c5f41286a6f76b5974efdf7e6ea24` | [viewer](https://orchid-project.org/phase-diagrams/#FE-TE/FeTe-18Arv.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeTe-18Arv.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeTe-18Arv.json) |
| FeTe-19Arv.tdb | C.-M. Arvhult, C. Gueneau, S. Gosse, M. Selleby, Calphad, 67, 101672(2019). [doi:10.1016/j.calphad.2019.101672](https://doi.org/10.1016/j.calphad.2019.101672) | `543d8ac5bac45cdab3260719b872557fc41d05a52aec4ddce017df7c4221aa19` | [viewer](https://orchid-project.org/phase-diagrams/#FE-TE/FeTe-19Arv.json) · [TDB](https://orchid-project.org/data/databases/sgte-binary/FeTe-19Arv.tdb) · [JSON](https://data.orchid-project.org/phase-diagrams/sgte/FeTe-19Arv.json) |

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

| TDB file | T (K) | Phases at the invariant |
|---|---:|---|
| FeTe-18Arv.tdb | 1729.64 | BCC_A2 (x(Te) 0.00975) + ION#2 (x(Te) 0.06613) + ION (x(Te) 0.43035) |
| FeTe-18Arv.tdb | 1166.91 | BCC_A2 (x(Te) 0.01033) + FETE_BETA_HT (x(Te) 0.46105) + ION (x(Te) 0.49498) |
| FeTe-18Arv.tdb | 1117.04 | BCC_A2 (x(Te) 0.00904) + FETE_C38 (x(Te) 0.45167) + FETE_BETA_HT (x(Te) 0.46122) |
| FeTe-18Arv.tdb | 1074.01 | FETE_BETA_HT (x(Te) 0.48866) + FETE_GAMMA (x(Te) 0.54191) + ION (x(Te) 0.54919) |
| FeTe-18Arv.tdb | 1073.28 | FETE_GAMMA (x(Te) 0.54191) + ION (x(Te) 0.55275) + FETE_DELTA (x(Te) 0.55458) |
| FeTe-18Arv.tdb | 1072.24 | FETE_C38 (x(Te) 0.4765) + FETE_BETA_HT (x(Te) 0.48856) + FETE_GAMMA (x(Te) 0.54191) |
| FeTe-18Arv.tdb | 1034.58 | FETE_DELTA (x(Te) 0.59047) + FETE_DELTA#2 (x(Te) 0.59281) + ION (x(Te) 0.64152) |
| FeTe-18Arv.tdb | 925.49 | FETE_DELTA (x(Te) 0.65624) + FETE2_C18 (x(Te) 0.67977) + ION (x(Te) 0.79326) |
| FeTe-18Arv.tdb | 909.74 | FETE_C38 (x(Te) 0.48576) + FETE_GAMMA (x(Te) 0.54191) + FETE_DELTA (x(Te) 0.57348) |
| FeTe-18Arv.tdb | 796.21 | FETE_C38 (x(Te) 0.49049) + FETE_DELTA (x(Te) 0.58938) + FETE_DELTA#2 (x(Te) 0.59186) |
| FeTe-18Arv.tdb | 788.63 | FETE_C38 (x(Te) 0.49076) + FETE_DELTA (x(Te) 0.59042) + FETE2_C18 (x(Te) 0.66674) |
| FeTe-18Arv.tdb | 788.46 | FETE_C38 (x(Te) 0.49075) + FETE_DELTA (x(Te) 0.59295) + FETE2_C18 (x(Te) 0.66674) |
| FeTe-18Arv.tdb | 720.08 | FETE2_C18 (x(Te) 0.67379) + ION (x(Te) 0.98959) + HEXAGONAL_A8 (x(Te) 1) |
| FeTe-19Arv.tdb | 1185.14 | BCC_A2 (x(Te) 0.0108) + FETE_BETA_HT (x(Te) 0.461) + ION (x(Te) 0.4957) |
| FeTe-19Arv.tdb | 1117.04 | BCC_A2 (x(Te) 0.00904) + FETE_C38 (x(Te) 0.45167) + FETE_BETA_HT (x(Te) 0.46122) |
| FeTe-19Arv.tdb | 1084.69 | FETE_BETA_HT (x(Te) 0.48909) + FETE_DELTA (x(Te) 0.55292) + ION (x(Te) 0.55502) |
| FeTe-19Arv.tdb | 1080.24 | FETE_BETA_HT (x(Te) 0.48904) + FETE_GAMMA (x(Te) 0.54191) + FETE_DELTA (x(Te) 0.55314) |
| FeTe-19Arv.tdb | 1072.24 | FETE_C38 (x(Te) 0.4765) + FETE_BETA_HT (x(Te) 0.48856) + FETE_GAMMA (x(Te) 0.54191) |
| FeTe-19Arv.tdb | 1035.09 | FETE_DELTA (x(Te) 0.59048) + FETE_DELTA#2 (x(Te) 0.59282) + ION (x(Te) 0.64715) |
| FeTe-19Arv.tdb | 925.19 | FETE_DELTA (x(Te) 0.65604) + FETE2_C18 (x(Te) 0.67962) + ION (x(Te) 0.78772) |
| FeTe-19Arv.tdb | 909.74 | FETE_C38 (x(Te) 0.48576) + FETE_GAMMA (x(Te) 0.54191) + FETE_DELTA (x(Te) 0.57348) |
| FeTe-19Arv.tdb | 796.21 | FETE_C38 (x(Te) 0.49049) + FETE_DELTA (x(Te) 0.58938) + FETE_DELTA#2 (x(Te) 0.59186) |
| FeTe-19Arv.tdb | 788.63 | FETE_C38 (x(Te) 0.49076) + FETE_DELTA (x(Te) 0.59042) + FETE2_C18 (x(Te) 0.66674) |
| FeTe-19Arv.tdb | 788.46 | FETE_C38 (x(Te) 0.49075) + FETE_DELTA (x(Te) 0.59295) + FETE2_C18 (x(Te) 0.66674) |
| FeTe-19Arv.tdb | 720.4 | FETE2_C18 (x(Te) 0.67383) + ION (x(Te) 0.99079) + HEXAGONAL_A8 (x(Te) 1) |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/FE/FE-TE.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/FE/FE-TE.json) · [CALPHAD hull FeTe-18Arv](https://data.orchid-project.org/hulls/calphad-sgte/FE/FE-TE--FeTe-18Arv.json)

## Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from [dft_parity.json](https://data.orchid-project.org/literature/dft_parity.json).

Table: Enthalpies of formation, Fe–Te system (8)

| Phase | Compound | Value | T (K) | Class | MP DFT (kJ/mol-atom) | OQMD DFT (kJ/mol-atom) | Source | Location | Quote |
|---|---|---:|---:|---|---:|---:|---|---|---|
| β |  | -27.8 kJ/mol (basis unstated) | 298.15 | unspecified |  |  | [1] Arvhult 2018; _cites Mathews 1993_ [doi](https://doi.org/10.1016/0022-3115%2893%2990163-s) | Table 5, p. 9, row 4; `ORC-JR3RDFX225.c2de3c` |  |
| β |  | -23.46 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [1] Arvhult 2018; _cites Shukla 1990_ [doi](https://doi.org/10.1016/0021-9614%2890%2990178-s) | Table 5, p. 9, row 6; `ORC-P6BGIJXFRP` |  |
| β |  | -20.2 kJ/mol (basis unstated) | 298.15 | model |  |  | [1] Arvhult 2018 | Table 5, p. 9, row 3; `ORC-BNKCAB6TIU.24c11e` |  |
| β |  | -19.5 kJ/mol (basis unstated) | 298.15 | model |  |  | [1] Arvhult 2018 | Table 5, p. 9, row 5; `ORC-2HVLUPQM56` |  |
| β |  | -17.6 kJ/mol (basis unstated) | 298.15 | model |  |  | [1] Arvhult 2018 | Table 5, p. 9, row 1; `ORC-5WGGRXCUPI.6af422` |  |
| β |  | -17.2 kJ/mol (basis unstated) | 298.15 | unspecified |  |  | [1] Arvhult 2018; _cites Mathews 1993_ [doi](https://doi.org/10.1016/0022-3115%2893%2990163-s) | Table 5, p. 9, row 2; `ORC-OV5IPF3BPX.d59c29` |  |
| ε |  | -65.8 kJ/mol (basis unstated) | 298.15 | experimental |  |  | [1] Arvhult 2018; _cites Sai 1996_ | Table 5, p. 9, row 10; `ORC-Z7FIXIDJBG.1dcd0e` |  |
| ε |  | -51.9 kJ/mol (basis unstated) | 298.15 | model |  |  | [1] Arvhult 2018 | Table 5, p. 9, row 9; `ORC-JMOZI5YT4C.54c31b` |  |

## Other properties

### Phase transition (1)

Table: Phase transition, Fe–Te system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 67 K | 67 | b | experimental | [1] Arvhult 2018 | p. 8; `ORC-2UXPTGXQEI` | “The lambda peak at 67 K in the heat capacity of the b phase was not modeled, and the single point seen in Fig. 9 that strongly deviates from the linear behavior was regarded as an artifact and ignored.” |

### Formation (8)

Table: Formation, Fe–Te system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Gibbs energy of formation; _printed: Δf°Gm_ | -21.2 kJ/mol (basis unstated) | 298.15 | β; _alloy: Fe 0.5525, Te 0.4475_ | model | [1] Arvhult 2018 | Table 5, p. 9, row 1; `ORC-5WGGRXCUPI.9e3b0f` |  |
| Gibbs energy of formation; _printed: Δf°Gm_ | -24 kJ/mol (basis unstated) | 298.15 | β; _alloy: Fe 0.5155, Te 0.4845_ | model | [1] Arvhult 2018 | Table 5, p. 9, row 3; `ORC-BNKCAB6TIU.d912d7` |  |
| Gibbs energy of formation; _printed: Δf°Gm_ | -29.7 kJ/mol (basis unstated) | 298.15 | β; _alloy: Fe 0.5155, Te 0.4845_ | unspecified | [1] Arvhult 2018; _cites Mathews 1993_ [doi](https://doi.org/10.1016/0022-3115%2893%2990163-s) | Table 5, p. 9, row 4; `ORC-JR3RDFX225.4f9739` |  |
| Gibbs energy of formation; _printed: Δf°Gm_ | -21.1 kJ/mol (basis unstated) | 298.15 | β; _alloy: Fe 0.5525, Te 0.4475_ | unspecified | [1] Arvhult 2018; _cites Mathews 1993_ [doi](https://doi.org/10.1016/0022-3115%2893%2990163-s) | Table 5, p. 9, row 2; `ORC-OV5IPF3BPX.337aae` |  |
| Gibbs energy of formation; _printed: Δf°Gm_ | -51.1 kJ/mol (basis unstated) | 298.15 | ε; _alloy: Fe 0.3344, Te 0.6656_ | model | [1] Arvhult 2018 | Table 5, p. 9, row 9; `ORC-JMOZI5YT4C.0b3de5` |  |
| Gibbs energy of formation; _printed: Δf°Gm_ | -58.3 kJ/mol (basis unstated) | 298.15 | ε; _alloy: Fe 0.3344, Te 0.6656_ | experimental | [1] Arvhult 2018; _cites Sai 1996_ | Table 5, p. 9, row 10; `ORC-Z7FIXIDJBG.ca4089` |  |
| Gibbs energy of formation; _printed: Δf°Gm_ | -15.86 kJ/mol (basis unstated) | 800 | β; _alloy: Fe 0.54, Te 0.46_ | experimental | [1] Arvhult 2018; _cites Prasad 1988_ [doi](https://doi.org/10.1016/0021-9614%2888%2990182-6) | Table 5, p. 9, row 8; `ORC-4JYI6C3WAH` |  |
| Gibbs energy of formation; _printed: Δf°Gm_ | -15.6 kJ/mol (basis unstated) | 800 | β; _alloy: Fe 0.54, Te 0.46_ | model | [1] Arvhult 2018 | Table 5, p. 9, row 7; `ORC-JVMU6KMHOU` |  |

### Crystal structure (39)

Table: Crystal structure, Fe–Te system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 3.829 Å |  | β - Fe1.11Te; _alloy: Te 0.473934_ | experimental | [1] Arvhult 2018; _cites Leciejewicz 1963_ [doi](https://doi.org/10.3891/acta.chem.scand.17-2593) | Table 4, p. 5, row 3; `ORC-2ZNYC7OPXP.0a5475` |  |
| Lattice a | 4.03 Å | 0 | β - Fe2Te; _alloy: Te 0.333333_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 1; `ORC-373ALEIGH2.2ccee3` |  |
| Lattice a | 3.635 Å | 0 | β - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 2; `ORC-LZ4675GIPA.afdff0` |  |
| Lattice a | 3.984 Å | 0 | β' - Fe3Te2; _alloy: Te 0.4_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 4; `ORC-QUCGIPGXSU.df5c0b` |  |
| Lattice a | 3.846 Å |  | δ - Fe0.75Te; _alloy: Te 0.571429_ | experimental | [1] Arvhult 2018; _cites Grnvold 1954_ [doi](https://doi.org/10.3891/acta.chem.scand.08-1927) | Table 4, p. 5, row 9; `ORC-PAQLTFZ3EC.5e4349` |  |
| Lattice a | 6.677 Å | 0 | δ - Fe3Te4; _alloy: Te 0.571429_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 7; `ORC-66SOWVUJXQ.52382a` |  |
| Lattice a | 4.105 Å | 0 | δ - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 6; `ORC-MK5M6OGP27.ff3205` |  |
| Lattice a | 4.101 Å | 0 | δ - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 5; `ORC-ORLIEPCZH2.d72998` |  |
| Lattice a | 3.733 Å | 0 | δ - FeTe2; _alloy: Te 0.666667_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 8; `ORC-Y42QMQG25Q.a3c797` |  |
| Lattice a | 4.22 Å | 0 | δ' - Fe2Te; _alloy: Te 0.333333_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 12; `ORC-ZCWNWQAJZE.4f8084` |  |
| Lattice a | 3.813 Å |  | δ' - Fe2Te3; _alloy: Te 0.6_ | experimental | [1] Arvhult 2018; _cites Ward 1979_ [doi](https://doi.org/10.1088/0022-3719/12/5/016) | Table 4, p. 5, row 13; `ORC-B7LY2UOK4V.7958ae` |  |
| Lattice a | 4.108 Å | 0 | δ' - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 10; `ORC-FJWD3MRCPS.a86dc8` |  |
| Lattice a | 3.736 Å | 0 | δ' - FeTe2; _alloy: Te 0.666667_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 11; `ORC-YVGHZWWTIS.105980` |  |
| Lattice a | 5.266 Å |  | ε - FeTe2; _alloy: Te 0.666667_ | experimental | [1] Arvhult 2018; _cites Brostigen 1970_ [doi](https://doi.org/10.3891/acta.chem.scand.24-1925) | Table 4, p. 5, row 16; `ORC-FXIKLOX3OB.e0ab6e` |  |
| Lattice a | 5.247 Å | 0 | ε - FeTe2; _alloy: Te 0.666667_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 14; `ORC-NCJWGSJBWB.782af4` |  |
| Lattice b | 3.85 Å | 0 | δ - Fe3Te4; _alloy: Te 0.571429_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 7; `ORC-66SOWVUJXQ.d5ae31` |  |
| Lattice b | 7.11 Å | 0 | δ - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 6; `ORC-MK5M6OGP27.f4e675` |  |
| Lattice b | 6.268 Å |  | ε - FeTe2; _alloy: Te 0.666667_ | experimental | [1] Arvhult 2018; _cites Brostigen 1970_ [doi](https://doi.org/10.3891/acta.chem.scand.24-1925) | Table 4, p. 5, row 16; `ORC-FXIKLOX3OB.6aee21` |  |
| Lattice b | 6.242 Å | 0 | ε - FeTe2; _alloy: Te 0.666667_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 14; `ORC-NCJWGSJBWB.b8cbb0` |  |
| Lattice c | 6.288 Å |  | β - Fe1.11Te; _alloy: Te 0.473934_ | experimental | [1] Arvhult 2018; _cites Leciejewicz 1963_ [doi](https://doi.org/10.3891/acta.chem.scand.17-2593) | Table 4, p. 5, row 3; `ORC-2ZNYC7OPXP.cb3b2e` |  |
| Lattice c | 6.042 Å | 0 | β - Fe2Te; _alloy: Te 0.333333_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 1; `ORC-373ALEIGH2.6940bb` |  |
| Lattice c | 6.712 Å | 0 | β - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 2; `ORC-LZ4675GIPA.9ce69b` |  |
| Lattice c | 20.938 Å | 0 | β' - Fe3Te2; _alloy: Te 0.4_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 4; `ORC-QUCGIPGXSU.67c1ba` |  |
| Lattice c | 5.641 Å |  | δ - Fe0.75Te; _alloy: Te 0.571429_ | experimental | [1] Arvhult 2018; _cites Grnvold 1954_ [doi](https://doi.org/10.3891/acta.chem.scand.08-1927) | Table 4, p. 5, row 9; `ORC-PAQLTFZ3EC.e50f9d` |  |
| Lattice c | 10.89 Å | 0 | δ - Fe3Te4; _alloy: Te 0.571429_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 7; `ORC-66SOWVUJXQ.c0a692` |  |
| Lattice c | 5.06 Å | 0 | δ - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 6; `ORC-MK5M6OGP27.a5d687` |  |
| Lattice c | 5.07 Å | 0 | δ - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 5; `ORC-ORLIEPCZH2.8a8e2c` |  |
| Lattice c | 5.845 Å | 0 | δ - FeTe2; _alloy: Te 0.666667_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 8; `ORC-Y42QMQG25Q.a9c94e` |  |
| Lattice c | 5.312 Å | 0 | δ' - Fe2Te; _alloy: Te 0.333333_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 12; `ORC-ZCWNWQAJZE.63c0eb` |  |
| Lattice c | 5.63 Å |  | δ' - Fe2Te3; _alloy: Te 0.6_ | experimental | [1] Arvhult 2018; _cites Ward 1979_ [doi](https://doi.org/10.1088/0022-3719/12/5/016) | Table 4, p. 5, row 13; `ORC-B7LY2UOK4V.263aed` |  |
| Lattice c | 5.068 Å | 0 | δ' - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 10; `ORC-FJWD3MRCPS.e127d8` |  |
| Lattice c | 5.854 Å | 0 | δ' - FeTe2; _alloy: Te 0.666667_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 11; `ORC-YVGHZWWTIS.98e1ab` |  |
| Lattice c | 3.874 Å |  | ε - FeTe2; _alloy: Te 0.666667_ | experimental | [1] Arvhult 2018; _cites Brostigen 1970_ [doi](https://doi.org/10.3891/acta.chem.scand.24-1925) | Table 4, p. 5, row 16; `ORC-FXIKLOX3OB.f16f0a` |  |
| Lattice c | 3.886 Å | 0 | ε - FeTe2; _alloy: Te 0.666667_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 14; `ORC-NCJWGSJBWB.a4608b` |  |
| lattice beta | 90.1 ° |  | δ - Fe0.75Te; _alloy: Te 0.571429_ | experimental | [1] Arvhult 2018; _cites Grnvold 1954_ [doi](https://doi.org/10.3891/acta.chem.scand.08-1927) | Table 4, p. 5, row 9; `ORC-PAQLTFZ3EC.509d9f` |  |
| lattice beta | 90.65 ° | 0 | δ - Fe3Te4; _alloy: Te 0.571429_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 7; `ORC-66SOWVUJXQ.706a7c` |  |
| lattice beta | 90.05 ° | 0 | δ - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 6; `ORC-MK5M6OGP27.00a3d3` |  |
| lattice beta | 90.02 ° | 0 | δ - FeTe; _alloy: Te 0.5_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 5; `ORC-ORLIEPCZH2.8c5905` |  |
| lattice beta | 90.01 ° | 0 | δ - FeTe2; _alloy: Te 0.666667_ | DFT | [1] Arvhult 2018 | Table 4, p. 5, row 8; `ORC-Y42QMQG25Q.eda7f6` |  |

## Sources

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

1. C.-M. Arvhult, C. Guéneau, S. Gossé, M. Selleby, Thermodynamic assessment of the Fe-Te system. Part II: Thermodynamic modeling, Journal of Alloys and Compounds 767, 883-893 (2018). [doi:10.1016/j.jallcom.2018.07.051](https://doi.org/10.1016/j.jallcom.2018.07.051)

## 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/).