Ge–Te system

66 accepted literature values from 1 paper(s) (experimental 47, model 6, unspecified 13); 1 calculated phase diagram(s).

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (9) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	47
model	6
unspecified	13

Accepted values by property group
Property group	Values
invariant reaction	34
phase transition	5
phase equilibrium	27

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
GeTe-99Sch-LB.tdb	A. Schlieper, Y. Feutelais. S.G. Fries, B. Legendre, R. Blachnik, Calphad, 23, 1-18 (1999). doi:10.1016/S0364-5916(99)00012-7	`4acca1dfd153da40a8872dc47d0c1232e920515ed2a0575569eda9a05fb00c44`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
GeTe-99Sch-LB.tdb	993	DIAMOND_A4 (x(Te) 0) + LIQUID (x(Te) 0.4985) + GETE_B1 (x(Te) 0.5036)
GeTe-99Sch-LB.tdb	703.15	DIAMOND_A4 (x(Te) 0) + GETE_LOW (x(Te) 0.50024) + GETE_B1 (x(Te) 0.50033)
GeTe-99Sch-LB.tdb	678.15	GETE_LOW (x(Te) 0.50797) + GETE_B1 (x(Te) 0.50987) + LIQUID (x(Te) 0.83551)
GeTe-99Sch-LB.tdb	658.04	GETE_LOW (x(Te) 0.50799) + LIQUID (x(Te) 0.84927) + HEXAGONAL_A8 (x(Te) 1)
GeTe-99Sch-LB.tdb	638.83	GETE_LOW (x(Te) 0.50706) + GETE_GAMMA (x(Te) 0.51) + HEXAGONAL_A8 (x(Te) 1)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Ge–Te system (34)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
998	eutectic: L -> β + Ge	β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 34	Table 2, p. 3, row 1 report
996	eutectic: L -> β + Ge	β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 60	Table 2, p. 3, row 6 report
993.1	eutectic: L -> β + Ge	β: Ge 0.5, Te 0.5	model	[1] Schlieper 1999	Table 2, p. 3, row 31 report
993	eutectic: L -> β + Ge	β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 77	Table 2, p. 3, row 22 report
733	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 51	Table 2, p. 3, row 3 report
725	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 62	Table 2, p. 3, row 7 report
713	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 53	Table 2, p. 3, row 5 report
703.2	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	model	[1] Schlieper 1999	Table 2, p. 3, row 32 report
703	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 65	Table 2, p. 3, row 8 report
703	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 77	Table 2, p. 3, row 23 report
701	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 69	Table 2, p. 3, row 11 report
700	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 75	Table 2, p. 3, row 14 report
700	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 77	Table 2, p. 3, row 18 report
683	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 86	Table 2, p. 3, row 30 report
678.2	metatectic/catatectic: β -> α + L	β: Ge 0.5, Te 0.5; α: Ge 0.5, Te 0.5	model	[1] Schlieper 1999	Table 2, p. 3, row 33 report
678	metatectic/catatectic: β -> α + L	β: Ge 0.5, Te 0.5; α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 84	Table 2, p. 3, row 28 report
675	metatectic/catatectic: β -> α + L	β: Ge 0.5, Te 0.5; α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 77	Table 2, p. 3, row 19 report
673	metatectic/catatectic: β -> α + L	β: Ge 0.5, Te 0.5; α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 77	Table 2, p. 3, row 24 report
673	metatectic/catatectic: β -> α + L	β: Ge 0.5, Te 0.5; α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 69	Table 2, p. 3, row 12 report
673	peritectoid: α -> β + Ge	α: Ge 0.5, Te 0.5; β: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 76	Table 2, p. 3, row 16 report
663	metatectic/catatectic: β -> α + L	β: Ge 0.5, Te 0.5; α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 51	Table 2, p. 3, row 4 report
658.1	eutectic: L -> α + Te	α: Ge 0.5, Te 0.5	model	[1] Schlieper 1999	Table 2, p. 3, row 34 report
658	eutectic: L -> α + Te	α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 84	Table 2, p. 3, row 29 report
655	eutectic: L -> α + Te	α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 82	Table 2, p. 3, row 27 report
655	eutectic: L -> α + Te	α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 77	Table 2, p. 3, row 20 report
653	eutectic: L -> α + Te	α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 65	Table 2, p. 3, row 9 report
648	eutectic: L -> α + Te	α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 77	Table 2, p. 3, row 25 report
643	eutectic: L -> α + Te	α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 34	Table 2, p. 3, row 2 report
638.3	peritectoid: γ -> α + Te	γ: Ge 0.49, Te 0.51; α: Ge 0.5, Te 0.5	model	[1] Schlieper 1999	Table 2, p. 3, row 35 report
638	peritectoid: γ -> α + Te	γ: Ge 0.49, Te 0.51; α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 65	Table 2, p. 3, row 10 report
638	peritectoid: γ -> α + Te	γ: Ge 0.49, Te 0.51; α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 77	Table 2, p. 3, row 26 report
638	metatectic/catatectic: β -> α + L	β: Ge 0.5, Te 0.5; α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 76	Table 2, p. 3, row 17 report
630	metatectic/catatectic: β -> α + L	β: Ge 0.5, Te 0.5; α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 75	Table 2, p. 3, row 15 report
629	peritectoid: γ -> α + Te	γ: Ge 0.49, Te 0.51; α: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 77	Table 2, p. 3, row 21 report

Other properties

Phase transition (5)

Phase transition, Ge–Te system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	993.3 K	993.3	congruent melting: calculated	model	[1] Schlieper 1999	Table 1, p. 2, row 5 report
Phase transition	997 K	997	congruent melting: [60McH]	experimental	[1] Schlieper 1999 cites ref. 60	Table 1, p. 2, row 1 report
Phase transition	997 K	997	congruent melting: [77LEG1, 77LEG2]	experimental	[1] Schlieper 1999 cites ref. 77	Table 1, p. 2, row 3 report
Phase transition	998 K	998	congruent melting: [66BRE]	experimental	[1] Schlieper 1999 cites ref. 66	Table 1, p. 2, row 2 report
Phase transition	998 K	998	congruent melting: [96Opp]	experimental	[1] Schlieper 1999 cites ref. 96Opp	Table 1, p. 2, row 4 report

Phase equilibrium (27)

Phase equilibrium, Ge–Te system
Property	T (K)	Phases / composition	Class	Source	Location
Phase composition		α-GeTe α-GeTe: Ge 0.492, Te 0.508	experimental	[1] Schlieper 1999 cites ref. 76	Table 3, p. 4, row 6 report
Phase composition	523	α-GeTe α-GeTe: Ge 0.499, Te 0.501	unspecified	[1] Schlieper 1999 cites ref. 65	Table 3, p. 4, row 2 report
Phase composition	523	γ-GeTe γ-GeTe: Ge 0.477, Te 0.523	experimental	[1] Schlieper 1999 cites ref. 79	Table 3, p. 4, row 27 report
Phase composition	573	α-GeTe α-GeTe: Ge 0.499, Te 0.501	experimental	[1] Schlieper 1999 cites ref. 76	Table 3, p. 4, row 7 report
Phase composition	573	γ-GeTe γ-GeTe: Ge 0.482, Te 0.518	experimental	[1] Schlieper 1999 cites ref. 77	Table 3, p. 4, row 26 report
Phase composition	588	α-GeTe α-GeTe: Ge 0.5, Te 0.5	unspecified	[1] Schlieper 1999 cites ref. 53	Table 3, p. 4, row 1 report
Phase composition	613	α-GeTe α-GeTe: Ge 0.496, Te 0.504	unspecified	[1] Schlieper 1999 cites ref. 77	Table 3, p. 4, row 8 report
Phase composition	613	γ-GeTe γ-GeTe: Ge 0.487, Te 0.513	unspecified	[1] Schlieper 1999 cites ref. 77	Table 3, p. 4, row 25 report
Phase composition	623	α-GeTe α-GeTe: Ge 0.498, Te 0.502	unspecified	[1] Schlieper 1999 cites ref. 69	Table 3, p. 4, row 3 report
Phase composition	623	γ-GeTe γ-GeTe: Ge 0.471, Te 0.529	unspecified	[1] Schlieper 1999 cites ref. 69	Table 3, p. 4, row 24 report
Phase composition	633	α-GeTe α-GeTe: Ge 0.494, Te 0.506	unspecified	[1] Schlieper 1999 cites ref. 75	Table 3, p. 4, row 5 report
Phase composition	673	α-GeTe α-GeTe: Ge 0.484, Te 0.516	experimental	[1] Schlieper 1999 cites ref. 79	Table 3, p. 4, row 9 report
Phase composition	688	β-GeTe β-GeTe: Ge 0.484, Te 0.516	experimental	[1] Schlieper 1999 cites ref. 77	Table 3, p. 4, row 17 report
Phase composition	693	β-GeTe β-GeTe: Ge 0.487, Te 0.513	experimental	[1] Schlieper 1999 cites ref. 76	Table 3, p. 4, row 11 report
Phase composition	703	α-GeTe α-GeTe: Ge 0.4965, Te 0.5035	unspecified	[1] Schlieper 1999 cites ref. 75	Table 3, p. 4, row 4 report
Phase composition	703	β-GeTe β-GeTe: Ge 0.485, Te 0.515	unspecified	[1] Schlieper 1999 cites ref. 65	Table 3, p. 4, row 10 report
Phase composition	709	β-GeTe β-GeTe: Ge 0.499, Te 0.501	experimental	[1] Schlieper 1999 cites ref. 77	Table 3, p. 4, row 16 report
Phase composition	711	β-GeTe β-GeTe: Ge 0.5, Te 0.5	experimental	[1] Schlieper 1999 cites ref. 77	Table 3, p. 4, row 15 report
Phase composition	723	β-GeTe β-GeTe: Ge 0.487, Te 0.513	experimental	[1] Schlieper 1999 cites ref. 79	Table 3, p. 4, row 18 report
Phase composition	729	β-GeTe β-GeTe: Ge 0.506, Te 0.494	experimental	[1] Schlieper 1999 cites ref. 77	Table 3, p. 4, row 14 report
Phase composition	773	β-GeTe β-GeTe: Ge 0.484, Te 0.516	experimental	[1] Schlieper 1999 cites ref. 76	Table 3, p. 4, row 12 report
Phase composition	823	β-GeTe β-GeTe: Ge 0.489, Te 0.511	experimental	[1] Schlieper 1999 cites ref. 79	Table 3, p. 4, row 19 report
Phase composition	827	β-GeTe β-GeTe: Ge 0.4966, Te 0.5034	unspecified	[1] Schlieper 1999 cites ref. 85	Table 3, p. 4, row 20 report
Phase composition	873	β-GeTe β-GeTe: Ge 0.485, Te 0.515	experimental	[1] Schlieper 1999 cites ref. 76	Table 3, p. 4, row 13 report
Phase composition	874	β-GeTe β-GeTe: Ge 0.4956, Te 0.5044	unspecified	[1] Schlieper 1999 cites ref. 85	Table 3, p. 4, row 21 report
Phase composition	926	β-GeTe β-GeTe: Ge 0.4942, Te 0.5058	unspecified	[1] Schlieper 1999 cites ref. 85	Table 3, p. 4, row 22 report
Phase composition	973	β-GeTe β-GeTe: Ge 0.4935, Te 0.5065	unspecified	[1] Schlieper 1999 cites ref. 85	Table 3, p. 4, row 23 report

Sources

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

A. Schlieper, Y. Feutelais, S.G. Fries, B. Legendre, R. Blachnik, Thermodynamic evaluation of the Germanium — Tellurium system, Calphad 23, 1-18 (1999). doi:10.1016/s0364-5916(99)00012-7

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}
}