Cr–O system

3 accepted literature values from 1 paper(s) (experimental 2, model 1); 3 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 · interactive phase diagram · phases (11) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	2
model	1

Accepted values by property group
Property group	Values
phase transition	3

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
CrO-06Pov.tdb	E. Povoden, A.N. Grundy, L.J. Gauckler, J. Phase Equilib. Diffus., 27, 353-62(2006). doi:10.1361/154770306X116289	`91b2e0d80ba0b62e7dfdd5aa04673f98dc0e508f6b5088937be94102a1828696`	viewer · TDB · JSON
CrO-10Kje.tdb	L. Kjellqvist, M. Selleby, J. Alloys Compd., 507, 84-92(2010). doi:10.1016/j.jallcom.2010.04.252	`ee031ab4eb31aac15084a7d778b0ec94149ad50ba1d6db4331342faadd7c8525`	viewer · TDB · JSON
CrO-90Tay.tdb	J.R. Taylor, A.T. Dinsdale, Z. Metallkd., 81, 354-66(1990). doi:10.1515/ijmr-1990-810509	`d075f681078353bee26abeb18a9a526b509ed44eda944a15ef5cfd79dfd21442`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
CrO-06Pov.tdb	2976.87	GAS (x(O) 0.01242) + ION#2 (x(O) 0.1318) + ION (x(O) 0.46186)
CrO-06Pov.tdb	2976.87	GAS (x(O) 0.01242) + ION#2 (x(O) 0.1318) + ION (x(O) 0.46187)
CrO-06Pov.tdb	2538.71	ION (x(O) 0.58124) + CR2O3_D51 (x(O) 0.59905) + GAS (x(O) 0.98108)
CrO-06Pov.tdb	2116.84	BCC_A2 (x(O) 7.000e-4) + ION#2 (x(O) 0.0382) + ION (x(O) 0.49279)
CrO-06Pov.tdb	1973.2	ION (x(O) 0.50094) + CR3O4_H11 (x(O) 0.57143) + CR2O3_D51 (x(O) 0.5926)
CrO-06Pov.tdb	1938.28	BCC_A2 (x(O) 7.800e-4) + ION (x(O) 0.49729) + CR3O4_H11 (x(O) 0.57143)
CrO-06Pov.tdb	1917.97	BCC_A2 (x(O) 7.300e-4) + CR3O4_H11 (x(O) 0.57143) + CR2O3_D51 (x(O) 0.59211)
CrO-10Kje.tdb	2565.43	ION (x(O) 0.59818) + CR2O3_D51 (x(O) 0.59999) + GAS (x(O) 0.97306)
CrO-10Kje.tdb	2119.39	BCC_A2 (x(O) 0) + ION#2 (x(O) 0.03891) + ION (x(O) 0.46189)
CrO-10Kje.tdb	1911.97	BCC_A2 (x(O) 0) + ION (x(O) 0.49208) + CR2O3_D51 (x(O) 0.59954)
CrO-90Tay.tdb	2954.19	GAS (x(O) 0.03054) + ION#2 (x(O) 0.03922) + ION (x(O) 0.2189)
CrO-90Tay.tdb	2582.7	ION (x(O) 0.59997) + CR2O3_D51 (x(O) 0.59999) + GAS (x(O) 0.96992)
CrO-90Tay.tdb	2132.43	BCC_A2 (x(O) 0) + ION#2 (x(O) 0.03012) + ION (x(O) 0.44366)
CrO-90Tay.tdb	1923.95	BCC_A2 (x(O) 0) + CR3O4_H11 (x(O) 0.57143) + CR2O3_D51 (x(O) 0.59955)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CrO-06Pov · CALPHAD hull CrO-90Tay

Other properties

Phase transition (3)

Phase transition, Cr–O system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	305.5 K	305.5	magnetic	experimental	[1] Povoden 2006	p. 3 report	Eskolaite shows an antiferromagnetic to paramagnetic transition at 305.5 K.
Phase transition	2543 K	2543	other	experimental	[1] Povoden 2006 cites Bunting 1931	p. 3 report	Their calculated liquidus temperature of Cr2O3 in air is 2571.16 K, which is in good agreement with an early finding by Bunting[7] who measured 2543 ± 25 K.
Phase transition	2571.16 K	2571.16	other	model	[1] Povoden 2006	p. 3 report	Their calculated liquidus temperature of Cr2O3 in air is 2571.16 K, which is in good agreement with an early finding by Bunting[7] who measured 2543 ± 25 K.

Sources

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

Erwin Povoden, A. Nicholas Grundy, Ludwig J. Gauckler, Thermodynamic Reassessment of the Cr-O System in the Framework of Solid Oxide Fuel Cell (SOFC) Research, Journal of Phase Equilibria & Diffusion 27, 353-362 (2006). doi:10.1361/154770306x116289

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-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735859
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); 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; 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). 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_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@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}
}