O–Rh system

16 accepted literature values from 1 paper(s) (experimental 9, model 3, DFT 4); 0 calculated phase diagram(s). 6 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
DFT	4

Accepted values by property group
Property group	Values
invariant reaction	5
formation	7
crystal structure	4

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the O–Rh system (5)
T (K)	Reaction / phases	Class	Source	Location
2196	eutectic: Liquid -> (Rh)-FCC + Gas	model	[1] Gossé 2018	Table 4, p. 7, row 1 report
1422	peritectic: (Rh)-FCC + Gas -> Rh2O3	model	[1] Gossé 2018	Table 4, p. 7, row 2 report
1403	peritectic: (Rh)-FCC + Gas -> Rh2O3	experimental	[1] Gossé 2018 cites Muller 1968 doi	Table 4, p. 7, row 3 report
1033	peritectoid: (Rh)-FCC + Rh2O3 -> RhO2	model	[1] Gossé 2018	Table 4, p. 7, row 4 report
1023	peritectoid: (Rh)-FCC + Rh2O3 -> RhO2	experimental	[1] Gossé 2018 cites Muller 1968 doi	Table 4, p. 7, row 5 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, O–Rh system (7)
Phase	Value	T (K)	Class	Source	Location
Rh2O3	-451.9 kJ/mol (basis unstated) ± 16.7	1045	experimental	[1] Gossé 2018 cites Kleykamp 1969 doi	Table 1, p. 3, row 2 report
Rh2O3	-405.96 kJ/mol (basis unstated) ± 1.15	1107.5	experimental	[1] Gossé 2018 cites Nell 1997 doi	Table 1, p. 3, row 6 report
Rh2O3	-405.53 kJ/mol (basis unstated) ± 0.26	1273	experimental	[1] Gossé 2018 cites Jacob 1994 doi	Table 1, p. 3, row 7 report
Rh2O3	-387.586 kJ/mol (basis unstated)	298.15	experimental	[1] Gossé 2018 cites Bayer 1976 doi	Table 1, p. 3, row 1 report
Rh2O3	-360 kJ/mol (basis unstated) ± 3	1016	experimental	[1] Gossé 2018 cites Mallika 1985 doi	Table 1, p. 3, row 3 report
Rh2O3	-340.72 kJ/mol (basis unstated)	298.15	experimental	[1] Gossé 2018 cites Schmahl 1964 doi	Table 1, p. 3, row 5 report
Rh2O3	-338.21 kJ/mol (basis unstated)	298.15	experimental	[1] Gossé 2018 cites Tagirov 1975	Table 1, p. 3, row 4 report

Other properties

Crystal structure (4)

Crystal structure, O–Rh system
Property	Value	Phases / composition	Class	Source	Location
Lattice a	5.208 Å	Rh2O3	DFT	[1] Gossé 2018 cites Muller 1968 doi	Table 3, p. 5, row 1 report
Lattice a	4.489 Å	RhO2	DFT	[1] Gossé 2018 cites Muller 1968 doi	Table 3, p. 5, row 1 report
Lattice c	14.155 Å	Rh2O3	DFT	[1] Gossé 2018 cites Muller 1968 doi	Table 3, p. 5, row 2 report
Lattice c	3.09 Å	RhO2	DFT	[1] Gossé 2018 cites Muller 1968 doi	Table 3, p. 5, row 2 report

Sources

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

S. Gossé, S. Bordier, C. Guéneau, E. Brackx, R. Domenger, J. Rogez, Thermodynamic assessment of the rhodium-ruthenium-oxygen (Rh-Ru-O) system, Journal of Nuclear Materials 500, 252-264 (2018). doi:10.1016/j.jnucmat.2017.12.034

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}
}