Pu2C3: enthalpy of formation

12 accepted literature formation-enthalpy value(s) (experimental 9, model 1, unspecified 2).

Systems: C–Pu

Literature values

Enthalpy of formation of Pu2C3 reported in the literature (12)
Value	Phase as printed	T (K)	Class	Method	System	Source	Location
-102.09 kJ/mol (basis unstated) ± 11	C3Pu2	298.15	experimental	Calorimetric bomb	C–Pu	[1] Fischer 2008 cites Lorenzelli 1971 doi	Table 2, p. 3, row 5 report
-93.3 kJ/mol (basis unstated) ± 3.3	C3Pu2	298.15	experimental	Vapour pressure measurements	C–Pu	[1] Fischer 2008 cites Besmann 1983 doi	Table 2, p. 3, row 1 report
-88 kJ/mol (basis unstated) ± 8	C3Pu2	298.15	experimental	Combustion calorimetry	C–Pu	[1] Fischer 2008 cites Lapage 1969	Table 2, p. 3, row 9 report
-82.84 kJ/mol (basis unstated) ± 4	C3Pu2	298.15	experimental	Calorimetric measurements (C1.467Pu)	C–Pu	[1] Fischer 2008 cites Johnson 2008	Table 2, p. 3, row 3 report
-73.22 kJ/mol (basis unstated)	C3Pu2	298.15	experimental	Vapour pressure measurements	C–Pu	[1] Fischer 2008 cites Harris 1967	Table 2, p. 3, row 11 report
-67.53 kJ/mol (basis unstated) ± 4.6	C3Pu2	298.15	experimental	Knudsen cell effusion	C–Pu	[1] Fischer 2008 cites Battles 1970	Table 2, p. 3, row 6 report
-66.53 kJ/mol (basis unstated) ± 8	C3Pu2	298.15	experimental	Knudsen cell effusion	C–Pu	[1] Fischer 2008 cites Marcon 1970 doi	Table 2, p. 3, row 7 report
-55.23 kJ/mol (basis unstated) ± 10.5	C3Pu2	298.15	experimental	Knudsen effusion and emf	C–Pu	[1] Fischer 2008 cites Campbell 1970	Table 2, p. 3, row 8 report
-51.46 kJ/mol (basis unstated)	C3Pu2	298.15	experimental	Vapour pressure measurements	C–Pu	[1] Fischer 2008 cites Olson 1967	Table 2, p. 3, row 10 report
-77.06 kJ/mol (basis unstated)	C3Pu2	298.15	model		C–Pu	[1] Fischer 2008	Table 2, p. 3, row 14 report
-84.73 kJ/mol (basis unstated)	C3Pu2	298.15	unspecified	Compilation	C–Pu	[1] Fischer 2008 cites Barin 1995	Table 2, p. 3, row 13 report
-74.7 kJ/mol (basis unstated) ± 8.35	C3Pu2	298.15	unspecified	Compilation	C–Pu	[1] Fischer 2008 cites Lemire 2001	Table 2, p. 3, row 12 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 Pu2C3
Value	Unit	Printed	Reading	Method (class, basis)	Effective
-102.09	kJ/mol (basis unstated)	11	0.005	5 (combustion_calorimetry, cleaned_below_threshold)	11
-93.3	kJ/mol (basis unstated)	3.3	0.05	21 (kems_vapour, calibrated)	21
-88	kJ/mol (basis unstated)	8	0.05	5 (combustion_calorimetry, cleaned_below_threshold)	8
-82.84	kJ/mol (basis unstated)	4	0.005	16 (solution_reaction_calorimetry, calibrated)	16
-73.22	kJ/mol (basis unstated)		0.005	21 (kems_vapour, calibrated)	21
-67.53	kJ/mol (basis unstated)	4.6	0.005	21 (kems_vapour, calibrated)	21
-66.53	kJ/mol (basis unstated)	8	0.005	21 (kems_vapour, calibrated)	21
-55.23	kJ/mol (basis unstated)	10.5	0.005	21 (kems_vapour, calibrated)	21
-51.46	kJ/mol (basis unstated)		0.005	21 (kems_vapour, calibrated)	21
-77.06	kJ/mol (basis unstated)		0.005	19.5 (model_calculated, calibrated)	19.5
-84.73	kJ/mol (basis unstated)		0.005	17.5 (evaluated_compilation, calibrated)	17.5
-74.7	kJ/mol (basis unstated)	8.35	0.05	17.5 (evaluated_compilation, calibrated)	17.5

Sources

Evelyne Fischer, Thermodynamic modeling of the C–Pu system, Calphad 32, 371-377 (2008). doi:10.1016/j.calphad.2007.12.004

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}
}