# Pu2C3: enthalpy of formation > Enthalpy of formation of Pu2C3: 12 literature value(s) with sources, pages and quotes, from ORCHID. HTML: https://data.orchid-project.org/compounds/Pu2C3.html · Markdown: https://data.orchid-project.org/compounds/Pu2C3.md 12 accepted literature formation-enthalpy value(s) (experimental 9, model 1, unspecified 2). Systems: [C–Pu](https://data.orchid-project.org/systems/C-PU.html) ## Literature values Table: Enthalpy of formation of Pu2C3 reported in the literature (12) | Value | Phase as printed | T (K) | Class | Method | System | Source | Location | Quote | |---:|---|---:|---|---|---|---|---|---| | -102.09 kJ/mol (basis unstated) ± 11 | C3Pu2 | 298.15 | experimental | Calorimetric bomb | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Lorenzelli 1971_ [doi](https://doi.org/10.1016/0022-1902%2871%2980650-4) | Table 2, p. 3, row 5; `ORC-XP6N4C4OBN.bc077a` | | | -93.3 kJ/mol (basis unstated) ± 3.3 | C3Pu2 | 298.15 | experimental | Vapour pressure measurements | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Besmann 1983_ [doi](https://doi.org/10.1111/j.1151-2916.1983.tb10562.x) | Table 2, p. 3, row 1; `ORC-HMR7YCY3RI.3a4e2e` | | | -88 kJ/mol (basis unstated) ± 8 | C3Pu2 | 298.15 | experimental | Combustion calorimetry | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Lapage 1969_ | Table 2, p. 3, row 9; `ORC-L5WYOGWROC.dd9a78` | | | -82.84 kJ/mol (basis unstated) ± 4 | C3Pu2 | 298.15 | experimental | Calorimetric measurements (C1.467Pu) | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Johnson 2008_ | Table 2, p. 3, row 3; `ORC-IYUP4BL2VG.1cce48` | | | -73.22 kJ/mol (basis unstated) | C3Pu2 | 298.15 | experimental | Vapour pressure measurements | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Harris 1967_ | Table 2, p. 3, row 11; `ORC-RWZVX5F6SU.457e1f` | | | -67.53 kJ/mol (basis unstated) ± 4.6 | C3Pu2 | 298.15 | experimental | Knudsen cell effusion | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Battles 1970_ | Table 2, p. 3, row 6; `ORC-FAE7EX3PZP.c991ff` | | | -66.53 kJ/mol (basis unstated) ± 8 | C3Pu2 | 298.15 | experimental | Knudsen cell effusion | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Marcon 1970_ [doi](https://doi.org/10.1016/0022-1902%2870%2980305-0) | Table 2, p. 3, row 7; `ORC-F3LTDTT2XZ.7d7d5d` | | | -55.23 kJ/mol (basis unstated) ± 10.5 | C3Pu2 | 298.15 | experimental | Knudsen effusion and emf | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Campbell 1970_ | Table 2, p. 3, row 8; `ORC-5ANWZ6QAXS.6aba0e` | | | -51.46 kJ/mol (basis unstated) | C3Pu2 | 298.15 | experimental | Vapour pressure measurements | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Olson 1967_ | Table 2, p. 3, row 10; `ORC-4H644QZFXO.d94f20` | | | -77.06 kJ/mol (basis unstated) | C3Pu2 | 298.15 | model | | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008 | Table 2, p. 3, row 14; `ORC-4ZQNQHMDP4.2f36c8` | | | -84.73 kJ/mol (basis unstated) | C3Pu2 | 298.15 | unspecified | Compilation | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Barin 1995_ | Table 2, p. 3, row 13; `ORC-7MPUQBSPFQ.d625bf` | | | -74.7 kJ/mol (basis unstated) ± 8.35 | C3Pu2 | 298.15 | unspecified | Compilation | [C–Pu](https://data.orchid-project.org/systems/C-PU.html) | [1] Fischer 2008; _cites Lemire 2001_ | Table 2, p. 3, row 12; `ORC-V3YQ4FVLOK.29048e` | | ### Uncertainty budget Components kept separate, in the value's unit (literature [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md), [UNCERTAINTY_CALIBRATION.md](https://data.orchid-project.org/literature/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. Table: Uncertainty budget of the literature values of Pu2C3 | Value | Unit | Printed | Reading | Method (class, basis) | Composition | Scatter | Conversion | 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 1. Evelyne Fischer, Thermodynamic modeling of the C–Pu system, Calphad 32, 371-377 (2008). [doi:10.1016/j.calphad.2007.12.004](https://doi.org/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). https://doi.org/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). https://doi.org/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). https://doi.org/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. ```bibtex @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} } ``` --- Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).