SnSe2: enthalpy of formation

10 accepted literature formation-enthalpy value(s) (experimental 8, model 2); experimental median -41.9 kJ/mol-atom (n = 8); Materials Project -63.078 kJ/mol-atom (mp-aaaaaazp); OQMD -36.161 kJ/mol-atom (oqmd-8151).

Systems: Se–Sn

Literature values

Enthalpy of formation of SnSe2 reported in the literature (10)
Value	Phase as printed	T (K)	Class	System	Source	Location
-51 kJ/mol-atom ± 3	SnSe2	298.15	experimental	Se–Sn	[1] Feutelais 1996 cites ref. 67Kar	Table 9, p. 8, row 4 report
-51 kJ/mol-atom ± 3	SnSe2	298.15	experimental	Se–Sn	[1] Feutelais 1996 cites ref. 67Kar	Table 9, p. 8, row 3 report
-42.3 kJ/mol-atom ± 0.5	SnSe2	298.15	experimental	Se–Sn	[1] Feutelais 1996 cites Boone 1992 doi	Table 9, p. 8, row 9 report
-42.3 kJ/mol-atom ± 0.5	SnSe2	298.15	experimental	Se–Sn	[1] Feutelais 1996 cites Boone 1992 doi	Table 9, p. 8, row 10 report
-41.5 kJ/mol-atom ± 0.4	SnSe2	298.15	experimental	Se–Sn	[1] Feutelais 1996 cites ref. 71Mel	Table 9, p. 8, row 7 report
-41.5 kJ/mol-atom ± 0.4	SnSe2	298.15	experimental	Se–Sn	[1] Feutelais 1996 cites ref. 71Mel	Table 9, p. 8, row 6 report
-40.3 kJ/mol-atom ± 2.7	SnSe2	298.15	experimental	Se–Sn	[1] Feutelais 1996 cites ref. 67Rau	Table 9, p. 8, row 5 report
-36.3 kJ/mol-atom ± 7	SnSe2	298.15	experimental	Se–Sn	[1] Feutelais 1996 cites Kulyukhina 1977	Table 9, p. 8, row 8 report
-34.9 kJ/mol-atom	SnSe2	298.15	model	Se–Sn	[1] Feutelais 1996	Table 9, p. 8, row 12 report
-34.9 kJ/mol-atom	SnSe2	298.15	model	Se–Sn	[1] Feutelais 1996	Table 9, p. 8, row 11 report

Uncertainty budget

Components kept separate, in the value's unit (literature SCHEMA.md, UNCERTAINTY_CALIBRATION.md): effective = max(sqrt(max(printed, reading, method)^2 + composition^2 + conversion^2), scatter). The method floor is the robust between-study scatter of the method class in ORCHID (calibrated) or a documented prior; printed values and printed uncertainties are unchanged.

Uncertainty budget of the literature values of SnSe2
Value	Unit	Printed	Reading	Method (class, basis)	Effective
-51	kJ/mol-atom	3	0.05	3.5 (unknown, calibrated)	3.5
-51	kJ/mol-atom	3	0.05	3.5 (unknown, calibrated)	3.5
-42.3	kJ/mol-atom	0.5	0.05	3.5 (unknown, calibrated)	3.5
-42.3	kJ/mol-atom	0.5	0.05	3.5 (unknown, calibrated)	3.5
-41.5	kJ/mol-atom	0.4	0.05	3.5 (unknown, calibrated)	3.5
-41.5	kJ/mol-atom	0.4	0.05	3.5 (unknown, calibrated)	3.5
-40.3	kJ/mol-atom	2.7	0.05	3.5 (unknown, calibrated)	3.5
-36.3	kJ/mol-atom	7	0.05	3.5 (unknown, calibrated)	7
-34.9	kJ/mol-atom		0.05	3.9 (model_calculated, calibrated)	3.9
-34.9	kJ/mol-atom		0.05	3.9 (model_calculated, calibrated)	3.9

DFT formation energies

Lowest-energy entries at this composition. Materials Project and OQMD use different energy references and are never averaged. 1 eV/atom = 96.485 kJ/mol-atom.

DFT formation energy of SnSe2
Source	Entry	kJ/mol-atom	eV/atom	Space group	E above hull (kJ/mol-atom)	E above hull (eV/atom)	Theoretical
Materials Project	mp-aaaaaazp	-63.078	-0.653763	P-3m1	0	0	no
OQMD	oqmd-8151	-36.161	-0.374789	P-3m1	0	0	no

DFT sources: A. Jain et al., Commentary: The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002. doi:10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501-1509; S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010. doi:10.1007/s11837-013-0755-4 (CC BY 4.0);

Sources

Y. Feutelais, M. Majid, B. Legendre, S. G. Frics, Phase diagram investigation and proposition of a thermodynamic evaluation of the Tin-Selenium system, JPE 17, 40-49 (1996). doi:10.1007/bf02648368

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-Parity: DFT-vs-experiment formation-enthalpy benchmark (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735943
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); G. Kim, S. V. Meschel, P. Nash, W. Chen, Experimental formation enthalpies for intermetallic phases and other inorganic compounds, Scientific Data 4 (2017) 170162, https://doi.org/10.1038/sdata.2017.162; 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_dft_benchmark_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Parity: DFT-vs-experiment formation-enthalpy benchmark}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735943},
  url       = {https://doi.org/10.5281/zenodo.23735943},
  note      = {Version 1, machine-extracted}
}

@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}
}