C–Pr system

12 accepted literature values from 1 paper(s) (experimental 9, model 3); 0 calculated phase diagram(s). 3 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · phases (8) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	9
model	3

Accepted values by property group
Property group	Values
invariant reaction	6
formation	3
crystal structure	3

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the C–Pr system (6)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
1424.55	βPrC2 + (C) <-> αPrC2	βPrC2: C 0.666; (C): C 1; αPrC2: C 0.6667	model	[1] Peng 2011	Table 4, p. 6, row 35 report
1424.55	βPrC2 <-> Pr2C3 + αPrC2	βPrC2: C 0.666; Pr2C3: C 0.598; αPrC2: C 0.667	model	[1] Peng 2011	Table 4, p. 6, row 33 report
1418.15	βPrC2 <-> Pr2C3 + αPrC2		experimental	[1] Peng 2011 cites Conclusions	Table 4, p. 6, row 34 report
1407.15	βPrC2 + (C) <-> αPrC2		experimental	[1] Peng 2011 cites Conclusions	Table 4, p. 6, row 36 report
949.05	(βPr) <-> Pr2C3 + (αPr)	(βPr): C 0.065; Pr2C3: C 0.548; (αPr): C 0.044	model	[1] Peng 2011	Table 4, p. 6, row 29 report
948.15	(βPr) <-> Pr2C3 + (αPr)	(βPr): C 0.062	experimental	[1] Peng 2011 cites Conclusions	Table 4, p. 6, row 30 report

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, C–Pr system (3)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
Pr2C3	Pr2C3	-27.9 kJ/mol-atom	298.15	experimental	-13.558 (mp-aaaaabah)	-14.229 (oqmd-2191)	[1] Peng 2011 cites Anderson 1970	Table 2, p. 2, row 17 report
PrC2	PrC2	-29.4 kJ/mol-atom ± 1.6	298.15	experimental	-9.857 (mp-aaaaacyt)	-10.23 (oqmd-3666)	[1] Peng 2011 cites Meschel 1995 doi	Table 2, p. 2, row 19 report
PrC2	PrC2	-28.2 kJ/mol-atom ± 3.5	298.15	experimental	-9.857 (mp-aaaaacyt)	-10.23 (oqmd-3666)	[1] Peng 2011 cites Anderson 2011	Table 2, p. 2, row 18 report

Other properties

Crystal structure (3)

Crystal structure, C–Pr system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	8.59 Å	298.15	Pr2C3 alloy: Pr 0.4	experimental	[1] Peng 2011 cites Atoji 1978 doi	Table 1, p. 2, row 14 report
Lattice a	3.85 Å	298.15	α PrC2 alloy: Pr 0.333333	experimental	[1] Peng 2011 cites Atoji 1967	Table 1, p. 2, row 15 report
Lattice c	6.42 Å	298.15	α PrC2 alloy: Pr 0.333333	experimental	[1] Peng 2011 cites Atoji 1967	Table 1, p. 2, row 15 report

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

Yingbiao Peng, Yong Du, Lijun Zhang, Chunsheng Sha, Shuhong Liu, Feng Zheng et al., Thermodynamic modeling of the C–RE (RE=La, Ce and Pr) systems, Calphad 35, 533-541 (2011). doi:10.1016/j.calphad.2011.09.002

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-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735891
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); 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_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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}
}