As–Ge system

24 accepted literature values from 2 paper(s) (experimental 12, model 8, unspecified 4); 0 calculated phase diagram(s). 3 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · phases (8) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	12
model	8
unspecified	4

Accepted values by property group
Property group	Values
phase transition	6
formation	10
heat capacity / entropy / enthalpy	2
crystal structure	6

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull GeAs-21Wu · CALPHAD hull GeAs-84Ans-LB

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, As–Ge system (10)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
GeAs	AsGe	-5.5 kJ/mol-atom ± 2.6	298.15	experimental	-4.154 (mp-aaaaaodg)	-4.148 (oqmd-15392)	[1] Chen 2022 cites Fitzner 1996 doi	Table II, p. 3, row 1 report
GeAs	AsGe	-4.481 kJ/mol-atom	298.15	model	-4.154 (mp-aaaaaodg)	-4.148 (oqmd-15392)	[1] Chen 2022	Table II, p. 3, row 5 report
GeAs	AsGe	-4.43 kJ/mol-atom	0	unspecified	-4.154 (mp-aaaaaodg)	-4.148 (oqmd-15392)	[1] Chen 2022	Table II, p. 3, row 4 report
GeAs	AsGe	-4.14 kJ/mol-atom	0	model	-4.154 (mp-aaaaaodg)	-4.148 (oqmd-15392)	[1] Chen 2022 cites Saal 2013	Table II, p. 3, row 2 report
GeAs	AsGe	-2.98 kJ/mol-atom	0	model	-4.154 (mp-aaaaaodg)	-4.148 (oqmd-15392)	[1] Chen 2022 cites ref. 36	Table II, p. 3, row 3 report
GeAs2	As2Ge	-5.8 kJ/mol-atom ± 3.2	298.15	experimental	-3.963 (mp-aaaaazya)	-4.725 (oqmd-4450)	[1] Chen 2022 cites Fitzner 1996 doi	Table II, p. 3, row 6 report
GeAs2	As2Ge	-5.302 kJ/mol-atom	298.15	model	-3.963 (mp-aaaaazya)	-4.725 (oqmd-4450)	[1] Chen 2022	Table II, p. 3, row 10 report
GeAs2	As2Ge	-4.78 kJ/mol-atom	0	unspecified	-3.963 (mp-aaaaazya)	-4.725 (oqmd-4450)	[1] Chen 2022	Table II, p. 3, row 9 report
GeAs2	As2Ge	-4.71 kJ/mol-atom	0	model	-3.963 (mp-aaaaazya)	-4.725 (oqmd-4450)	[1] Chen 2022 cites Saal 2013	Table II, p. 3, row 7 report
GeAs2	As2Ge	-4.14 kJ/mol-atom	0	model	-3.963 (mp-aaaaazya)	-4.725 (oqmd-4450)	[1] Chen 2022 cites ref. 36	Table II, p. 3, row 8 report

Other properties

Phase transition (6)

Phase transition, As–Ge system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	1021 K	1021	GeAs2	experimental	[1] Chen 2022 cites Blachnik 1971 doi	p. 4 report	1021 K, respectively, which is close to the results from Ugai et al.32
Phase transition	1025 K	1025	GeAs	experimental	[1] Chen 2022 cites Blachnik 1971 doi	p. 2 report	The results reflected that GeAs and GeAs2 melted at 1025 K and
Phase transition	1029 K	1029	GeAs2	experimental	[1] Chen 2022 cites Ugai 1978	p. 10 report	In addition, the present results show that GeAs melts at 1037 K and GeAs2 melts at 1032 K, which are close to 1035 K and 1029 K given by Ugai et al.32
Phase transition	1032 K	1032	GeAs2	model	[1] Chen 2022	p. 10 report	In addition, the present results show that GeAs melts at 1037 K and GeAs2 melts at 1032 K, which are close to 1035 K and 1029 K given by Ugai et al.32
Phase transition	1035 K	1035	GeAs	experimental	[1] Chen 2022 cites Ugai 1978	p. 10 report	In addition, the present results show that GeAs melts at 1037 K and GeAs2 melts at 1032 K, which are close to 1035 K and 1029 K given by Ugai et al.32
Phase transition	1037 K	1037	GeAs	model	[1] Chen 2022	p. 10 report	In addition, the present results show that GeAs melts at 1037 K and GeAs2 melts at 1032 K, which are close to 1035 K and 1029 K given by Ugai et al.32

Heat capacity / entropy / enthalpy (2)

Heat capacity / entropy / enthalpy, As–Ge system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Entropy printed: °S^L - °S	28.28 J/mol (basis unstated)/K	1021	Ge0.33As0.66 alloy: As 0.666667, Ge 0.333333	unspecified	[2] Ansara 1984	Table VI, p. 13, row 7 report
Entropy printed: °S^L - °S	31.22 J/mol (basis unstated)/K	1025	Ge0.5As0.5 alloy: As 0.5, Ge 0.5	unspecified	[2] Ansara 1984	Table VI, p. 13, row 6 report

Crystal structure (6)

Crystal structure, As–Ge system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	15.59 Å	298.15	GeAs alloy: Ge 0.5	experimental	[1] Chen 2022 cites Wadsten 1967 doi	Table I, p. 2, row 2 report
Lattice a	14.76 Å	298.15	GeAs2 alloy: Ge 0.333333	experimental	[1] Chen 2022 cites Bryden 1962 doi	Table I, p. 2, row 3 report
Lattice b	3.792 Å	298.15	GeAs alloy: Ge 0.5	experimental	[1] Chen 2022 cites Wadsten 1967 doi	Table I, p. 2, row 2 report
Lattice b	10.16 Å	298.15	GeAs2 alloy: Ge 0.333333	experimental	[1] Chen 2022 cites Bryden 1962 doi	Table I, p. 2, row 3 report
Lattice c	9.49 Å	298.15	GeAs alloy: Ge 0.5	experimental	[1] Chen 2022 cites Wadsten 1967 doi	Table I, p. 2, row 2 report
Lattice c	3.728 Å	298.15	GeAs2 alloy: Ge 0.333333	experimental	[1] Chen 2022 cites Bryden 1962 doi	Table I, p. 2, row 3 report

Sources

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

Shanxiong Chen, Jiong Wang, Shangzhao Yu, Biao Hu, Qing Wu, Yong Du, Thermodynamic Modeling of the Ge-X (X = As, Se, S, P) Systems, J. Electron. Mater. 51, 2114-2130 (2022). doi:10.1007/s11664-022-09474-1
I. Ansara, D. Dutartre, Thermodynamic study of the Al-Ga-As-Ge system, Calphad 8, 323-342 (1984). doi:10.1016/0364-5916(84)90035-x

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-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); 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); 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. 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_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}
}