Ag2O: enthalpy of formation

9 accepted literature formation-enthalpy value(s) (experimental 3, model 6).

Systems: Ag–O

Literature values

Enthalpy of formation of Ag2O reported in the literature (9)
Value	Phase as printed	T (K)	Class	Method	System	Source	Location
-30.54 kJ/mol (basis unstated)	Ag2O	298.15	experimental	Solution calorimetry	Ag–O	[1] Assal 1997 cites Pitzer 1937	Table V, p. 6, row 3 report
-26.53 kJ/mol (basis unstated)	Ag2O	298.15	experimental	Reviewed†	Ag–O	[1] Assal 1997 cites Lewis 1906	Table V, p. 6, row 1 report
-22.6 kJ/mol (basis unstated)	Ag2O	298.15	experimental	Reaction calorimetry	Ag–O	[1] Assal 1997 cites Mixter 1911	Table V, p. 6, row 2 report
-31.1 kJ/mol (basis unstated)	Ag2O	298.15	model	Assessed	Ag–O	[1] Assal 1997 cites Kubaschewski 1993	Table V, p. 6, row 4 report
-30.68 kJ/mol (basis unstated)	Ag2O	298.15	model	Calculated	Ag–O	[1] Assal 1997	Table V, p. 6, row 6 report
-29.99 kJ/mol (basis unstated)	Ag2O	773	model	Calculated	Ag–O	[1] Assal 1997	Table V, p. 6, row 7 report
-29.44 kJ/mol (basis unstated)	Ag2O	609.5	model	Calculated from Refs. 7, 14, and 33	Ag–O	[1] Assal 1997 cites Pitzer 1937	Table V, p. 6, row 5 report
-25.81 kJ/mol (basis unstated)	Ag2O	773	model	Calculated	Ag–O	[1] Assal 1997	Table V, p. 6, row 7 report
-25.81 kJ/mol (basis unstated)	Ag2O	773	model	Calculated	Ag–O	[1] Assal 1997	Table V, p. 6, row 8 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 Ag2O
Value	Unit	Reading	Method (class, basis)	Effective
-30.54	kJ/mol (basis unstated)	0.005	9.6 (solution_reaction_calorimetry, calibrated)	9.6
-26.53	kJ/mol (basis unstated)	0.005	10.5 (evaluated_compilation, calibrated)	10.5
-22.6	kJ/mol (basis unstated)	0.05	9.6 (solution_reaction_calorimetry, calibrated)	9.6
-31.1	kJ/mol (basis unstated)	0.05	11.7 (model_calculated, calibrated)	11.7
-30.68	kJ/mol (basis unstated)	0.005	11.7 (model_calculated, calibrated)	11.7
-29.99	kJ/mol (basis unstated)	0.005	11.7 (model_calculated, calibrated)	11.7
-29.44	kJ/mol (basis unstated)	0.005	11.7 (model_calculated, calibrated)	11.7
-25.81	kJ/mol (basis unstated)	0.005	11.7 (model_calculated, calibrated)	11.7
-25.81	kJ/mol (basis unstated)	0.005	11.7 (model_calculated, calibrated)	11.7

Sources

Jérôme Assal, Bengt Hallstedt, Ludwig J. Gauckler, Thermodynamic Assessment of the Silver–Oxygen System, Journal of the American Ceramic Society 80, 3054-3060 (1997). doi:10.1111/j.1151-2916.1997.tb03232.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-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}
}