CuO: enthalpy of formation

19 accepted literature formation-enthalpy value(s) (experimental 13, model 6); experimental median -77.885 kJ/mol-atom (n = 13); Materials Project -90.966 kJ/mol-atom (mp-aaaaacnc); OQMD -80.231 kJ/mol-atom (oqmd-1343583).

Systems: Cu–O

Literature values

Enthalpy of formation of CuO reported in the literature (19)
Value	Phase as printed	T (K)	Class	Method	System	Source	Location
-80.855 kJ/mol-atom	CuO	298.15	experimental	React. Cal.	Cu–O	[1] Hallstedt 1994 cites Nufiez 1969	Table 8, p. 13, row 10 report
-80.855 kJ/mol-atom	CuO	298.15	experimental	React. Cal.	Cu–O	[1] Hallstedt 1994 cites Nufiez 1969	Table 8, p. 13, row 12 report
-80.54 kJ/mol-atom	CuO	295	experimental	React. Cal.	Cu–O	[1] Hallstedt 1994 cites H 1932	Table 8, p. 13, row 3 report
-78.535 kJ/mol-atom	CuO	298.15	experimental	React. Cal.	Cu–O	[1] Hallstedt 1994 cites Nufiez 1969	Table 8, p. 13, row 10 report
-78.535 kJ/mol-atom	CuO	298.15	experimental	React. Cal.	Cu–O	[1] Hallstedt 1994 cites Nufiez 1969	Table 8, p. 13, row 11 report
-77.885 kJ/mol-atom	CuO	298.15	experimental	React. Cal.	Cu–O	[1] Hallstedt 1994 cites Mah 1967	Table 8, p. 13, row 8 report
-77.885 kJ/mol-atom	CuO	298.15	experimental	React. Cal.	Cu–O	[1] Hallstedt 1994 cites Mah 1967	Table 8, p. 13, row 9 report
-77.74 kJ/mol-atom	CuO	298.15	experimental	Aq. Cal.	Cu–O	[1] Hallstedt 1994 cites Thomsen 1883	Table 8, p. 13, row 2 report
-77.74 kJ/mol-atom	CuO	298.15	experimental	Aq. Cal.	Cu–O	[1] Hallstedt 1994 cites Thomsen 1883	Table 8, p. 13, row 1 report
-76.15 kJ/mol-atom	CuO	293	experimental	Sol. Cal.	Cu–O	[1] Hallstedt 1994 cites ref. 34Bil	Table 8, p. 13, row 7 report
-76.15 kJ/mol-atom	CuO	293	experimental	Sol. Cal.	Cu–O	[1] Hallstedt 1994 cites ref. 34Bil	Table 8, p. 13, row 6 report
-69.08 kJ/mol-atom	CuO	298.15	experimental	Cal.	Cu–O	[1] Hallstedt 1994 cites Wrhler 1934	Table 8, p. 13, row 5 report
-69.08 kJ/mol-atom	CuO	298.15	experimental	Cal.	Cu–O	[1] Hallstedt 1994 cites Wrhler 1934	Table 8, p. 13, row 4 report
-78.03 kJ/mol-atom	CuO	298.15	model	Assessed	Cu–O	[1] Hallstedt 1994 cites Chase 1985	Table 8, p. 13, row 14 report
-78.03 kJ/mol-atom	CuO	298.15	model	Assessed	Cu–O	[1] Hallstedt 1994 cites Chase 1985	Table 8, p. 13, row 13 report
-77.595 kJ/mol-atom	CuO	298.15	model	Assessed	Cu–O	[1] Hallstedt 1994	Table 8, p. 13, row 18 report
-77.595 kJ/mol-atom	CuO	298.15	model	Assessed	Cu–O	[1] Hallstedt 1994	Table 8, p. 13, row 17 report
-77.015 kJ/mol-atom	CuO	298.15	model	Assessed	Cu–O	[1] Hallstedt 1994 cites Boud 1991	Table 8, p. 13, row 16 report
-77.015 kJ/mol-atom	CuO	298.15	model	Assessed	Cu–O	[1] Hallstedt 1994 cites Boud 1991	Table 8, p. 13, row 15 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 CuO
Value	Unit	Reading	Method (class, basis)	Effective
-80.855	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-80.855	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-80.54	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-78.535	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-78.535	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-77.885	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-77.885	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-77.74	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-77.74	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-76.15	kJ/mol-atom	0.025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-76.15	kJ/mol-atom	0.025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-69.08	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-69.08	kJ/mol-atom	0.0025	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-78.03	kJ/mol-atom	0.0025	3.9 (model_calculated, calibrated)	3.9
-78.03	kJ/mol-atom	0.0025	3.9 (model_calculated, calibrated)	3.9
-77.595	kJ/mol-atom	0.0025	3.9 (model_calculated, calibrated)	3.9
-77.595	kJ/mol-atom	0.0025	3.9 (model_calculated, calibrated)	3.9
-77.015	kJ/mol-atom	0.0025	3.9 (model_calculated, calibrated)	3.9
-77.015	kJ/mol-atom	0.0025	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 CuO
Source	Entry	kJ/mol-atom	eV/atom	Space group	E above hull (kJ/mol-atom)	E above hull (eV/atom)	Theoretical
Materials Project	mp-aaaaacnc	-90.966	-0.942795	P4_2/mmc	0	0	yes
OQMD	oqmd-1343583	-80.231	-0.831534	P42/mmc	0	0	yes

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

B. Hallstedt, D. Risold, L. J. Gauckler, Thermodynamic assessment of the copper-oxygen system, JPE 15, 483-499 (1994). doi:10.1007/bf02649399

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}
}