Fe–Te system

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

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (10) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	15
model	8
DFT	29
unspecified	4

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.

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	`3c9d8dd7e2fb409823bf126986510115290c5f41286a6f76b5974efdf7e6ea24`	viewer · TDB · JSON
FeTe-19Arv.tdb	C.-M. Arvhult, C. Gueneau, S. Gosse, M. Selleby, Calphad, 67, 101672(2019). doi:10.1016/j.calphad.2019.101672	`543d8ac5bac45cdab3260719b872557fc41d05a52aec4ddce017df7c4221aa19`	viewer · TDB · JSON

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 · OQMD DFT hull · CALPHAD hull FeTe-18Arv

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.

Enthalpies of formation, Fe–Te system (8)
Phase	Value	T (K)	Class	Source	Location
β	-27.8 kJ/mol (basis unstated)	298.15	unspecified	[1] Arvhult 2018 cites Mathews 1993 doi	Table 5, p. 9, row 4 report
β	-23.46 kJ/mol (basis unstated)	298.15	experimental	[1] Arvhult 2018 cites Shukla 1990 doi	Table 5, p. 9, row 6 report
β	-20.2 kJ/mol (basis unstated)	298.15	model	[1] Arvhult 2018	Table 5, p. 9, row 3 report
β	-19.5 kJ/mol (basis unstated)	298.15	model	[1] Arvhult 2018	Table 5, p. 9, row 5 report
β	-17.6 kJ/mol (basis unstated)	298.15	model	[1] Arvhult 2018	Table 5, p. 9, row 1 report
β	-17.2 kJ/mol (basis unstated)	298.15	unspecified	[1] Arvhult 2018 cites Mathews 1993 doi	Table 5, p. 9, row 2 report
ε	-65.8 kJ/mol (basis unstated)	298.15	experimental	[1] Arvhult 2018 cites Sai 1996	Table 5, p. 9, row 10 report
ε	-51.9 kJ/mol (basis unstated)	298.15	model	[1] Arvhult 2018	Table 5, p. 9, row 9 report

Other properties

Phase transition (1)

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 report	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)

Formation, Fe–Te system
Property	Value	T (K)	Phases / composition	Class	Source	Location
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 report
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 report
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	Table 5, p. 9, row 4 report
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	Table 5, p. 9, row 2 report
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 report
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 report
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	Table 5, p. 9, row 8 report
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 report

Crystal structure (39)

Crystal structure, Fe–Te system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	3.829 Å		β - Fe1.11Te alloy: Te 0.473934	experimental	[1] Arvhult 2018 cites Leciejewicz 1963 doi	Table 4, p. 5, row 3 report
Lattice a	4.03 Å	0	β - Fe2Te alloy: Te 0.333333	DFT	[1] Arvhult 2018	Table 4, p. 5, row 1 report
Lattice a	3.635 Å	0	β - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 2 report
Lattice a	3.984 Å	0	β' - Fe3Te2 alloy: Te 0.4	DFT	[1] Arvhult 2018	Table 4, p. 5, row 4 report
Lattice a	3.846 Å		δ - Fe0.75Te alloy: Te 0.571429	experimental	[1] Arvhult 2018 cites Grnvold 1954 doi	Table 4, p. 5, row 9 report
Lattice a	6.677 Å	0	δ - Fe3Te4 alloy: Te 0.571429	DFT	[1] Arvhult 2018	Table 4, p. 5, row 7 report
Lattice a	4.105 Å	0	δ - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 6 report
Lattice a	4.101 Å	0	δ - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 5 report
Lattice a	3.733 Å	0	δ - FeTe2 alloy: Te 0.666667	DFT	[1] Arvhult 2018	Table 4, p. 5, row 8 report
Lattice a	4.22 Å	0	δ' - Fe2Te alloy: Te 0.333333	DFT	[1] Arvhult 2018	Table 4, p. 5, row 12 report
Lattice a	3.813 Å		δ' - Fe2Te3 alloy: Te 0.6	experimental	[1] Arvhult 2018 cites Ward 1979 doi	Table 4, p. 5, row 13 report
Lattice a	4.108 Å	0	δ' - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 10 report
Lattice a	3.736 Å	0	δ' - FeTe2 alloy: Te 0.666667	DFT	[1] Arvhult 2018	Table 4, p. 5, row 11 report
Lattice a	5.266 Å		ε - FeTe2 alloy: Te 0.666667	experimental	[1] Arvhult 2018 cites Brostigen 1970 doi	Table 4, p. 5, row 16 report
Lattice a	5.247 Å	0	ε - FeTe2 alloy: Te 0.666667	DFT	[1] Arvhult 2018	Table 4, p. 5, row 14 report
Lattice b	3.85 Å	0	δ - Fe3Te4 alloy: Te 0.571429	DFT	[1] Arvhult 2018	Table 4, p. 5, row 7 report
Lattice b	7.11 Å	0	δ - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 6 report
Lattice b	6.268 Å		ε - FeTe2 alloy: Te 0.666667	experimental	[1] Arvhult 2018 cites Brostigen 1970 doi	Table 4, p. 5, row 16 report
Lattice b	6.242 Å	0	ε - FeTe2 alloy: Te 0.666667	DFT	[1] Arvhult 2018	Table 4, p. 5, row 14 report
Lattice c	6.288 Å		β - Fe1.11Te alloy: Te 0.473934	experimental	[1] Arvhult 2018 cites Leciejewicz 1963 doi	Table 4, p. 5, row 3 report
Lattice c	6.042 Å	0	β - Fe2Te alloy: Te 0.333333	DFT	[1] Arvhult 2018	Table 4, p. 5, row 1 report
Lattice c	6.712 Å	0	β - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 2 report
Lattice c	20.938 Å	0	β' - Fe3Te2 alloy: Te 0.4	DFT	[1] Arvhult 2018	Table 4, p. 5, row 4 report
Lattice c	5.641 Å		δ - Fe0.75Te alloy: Te 0.571429	experimental	[1] Arvhult 2018 cites Grnvold 1954 doi	Table 4, p. 5, row 9 report
Lattice c	10.89 Å	0	δ - Fe3Te4 alloy: Te 0.571429	DFT	[1] Arvhult 2018	Table 4, p. 5, row 7 report
Lattice c	5.06 Å	0	δ - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 6 report
Lattice c	5.07 Å	0	δ - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 5 report
Lattice c	5.845 Å	0	δ - FeTe2 alloy: Te 0.666667	DFT	[1] Arvhult 2018	Table 4, p. 5, row 8 report
Lattice c	5.312 Å	0	δ' - Fe2Te alloy: Te 0.333333	DFT	[1] Arvhult 2018	Table 4, p. 5, row 12 report
Lattice c	5.63 Å		δ' - Fe2Te3 alloy: Te 0.6	experimental	[1] Arvhult 2018 cites Ward 1979 doi	Table 4, p. 5, row 13 report
Lattice c	5.068 Å	0	δ' - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 10 report
Lattice c	5.854 Å	0	δ' - FeTe2 alloy: Te 0.666667	DFT	[1] Arvhult 2018	Table 4, p. 5, row 11 report
Lattice c	3.874 Å		ε - FeTe2 alloy: Te 0.666667	experimental	[1] Arvhult 2018 cites Brostigen 1970 doi	Table 4, p. 5, row 16 report
Lattice c	3.886 Å	0	ε - FeTe2 alloy: Te 0.666667	DFT	[1] Arvhult 2018	Table 4, p. 5, row 14 report
lattice beta	90.1 °		δ - Fe0.75Te alloy: Te 0.571429	experimental	[1] Arvhult 2018 cites Grnvold 1954 doi	Table 4, p. 5, row 9 report
lattice beta	90.65 °	0	δ - Fe3Te4 alloy: Te 0.571429	DFT	[1] Arvhult 2018	Table 4, p. 5, row 7 report
lattice beta	90.05 °	0	δ - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 6 report
lattice beta	90.02 °	0	δ - FeTe alloy: Te 0.5	DFT	[1] Arvhult 2018	Table 4, p. 5, row 5 report
lattice beta	90.01 °	0	δ - FeTe2 alloy: Te 0.666667	DFT	[1] Arvhult 2018	Table 4, p. 5, row 8 report

Sources

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

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

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). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi: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). doi: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). doi: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.

@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}
}