U–O system

0 accepted literature values from 0 paper(s); 6 calculated phase diagram(s).

Data: interactive phase diagram · Markdown

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
UO-02Che.tdb	P.-Y. Chevalier, E. Fischer, B. Cheynet, J. Nucl. Mater., 303, 1-28(2002). doi:10.1016/S0022-3115(02)00813-9	`f43d17d1669f4d07dcba2a16599851bb7d8cc97cf42b9f7fcd1fe18d45d87ece`	viewer · TDB · JSON
UO-02Gue.tdb	C. Gueneau, M. Baichi, D. Labroche, C. Chatillon, B. Sundman, J. Nucl. Mater., 304, 161-75(2002). doi:10.1016/S0022-3115(02)00878-4	`dabf96b4fc2869745bb78b561f074e8e25c2ce3d15ac19a0b392debcbaaf5c61`	viewer · TDB · JSON
UO-04Che.tdb	P.-Y. Chevalier, E. Fischer, B. Cheynet, Calphad, 28, 15-40(2004). doi:10.1016/j.calphad.2004.03.005	`c929e68af28f01b244b50433ea6437becbc4bd879e0cfc285d5376050f8b145f`	viewer · TDB · JSON
UO-08Bar.tdb	M. Barrachin, P.-Y. Chevalier, B. Cheynet, E. Fischer, J. Nucl. Mater., 375, 397-409(2008). doi:10.1016/j.jnucmat.2008.02.003	`9c0bd45c36c212ad50d8cb42d24641de2be59b7101a456773b1c1b112a962ac4`	viewer · TDB · JSON
UO-11Gue.tdb	C. Gueneau, N. Dupin, B. Sundman, C. Martial, J.-C. Dumas, S. Gosse, S. Chatain, F. De Bruycker, D. Manara, R.J.M. Konings, J. Nucl. Mater., 419, 145-67(2011). doi:10.1016/j.jnucmat.2011.07.033	`880201adec5fc9b23e6b96b082d9df79ff4066891805b77d528964846792e8ea`	viewer · TDB · JSON
UO-23Jia.tdb	Y. Jiang, Y. He, W. Zheng, J. Zhang, D. Zhang, X. Lu, J. Nucl. Mater., 574, 154180(2023). doi:10.1016/j.jnucmat.2022.154180	`cdb48540c17b0ad40f5814b89d086bfb9970d06d23686aec4a5d548b05ab878a`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
UO-02Che.tdb	3759.28	LIQUID (x(O) 0.24101) + LIQUID#2 (x(O) 0.50136) + GAS (x(O) 0.5177)
UO-02Che.tdb	3076.17	UO2_C1 (x(O) 0.67429) + LIQUID (x(O) 0.67877) + GAS (x(O) 0.7782)
UO-02Che.tdb	2692.09	LIQUID#2 (x(O) 0.04021) + LIQUID (x(O) 0.58133) + UO2_C1 (x(O) 0.62609)
UO-02Che.tdb	2155.29	UO2_C1 (x(O) 0.69125) + U3O8 (x(O) 0.72727) + GAS (x(O) 0.98605)
UO-02Che.tdb	1407.96	BCC_A2 (x(O) 0) + LIQUID (x(O) 4.000e-5) + UO2_C1 (x(O) 0.66614)
UO-02Che.tdb	1048.99	TETRAGONAL_U (x(O) 0) + BCC_A2 (x(O) 0) + UO2_C1 (x(O) 0.66664)
UO-02Che.tdb	942.02	ORTHORHOMBIC_A20 (x(O) 0) + TETRAGONAL_U (x(O) 0) + UO2_C1 (x(O) 0.66666)
UO-02Che.tdb	941.79	U3O8 (x(O) 0.72727) + UO3 (x(O) 0.75) + GAS (x(O) 1)
UO-02Che.tdb	941.79	U3O8 (x(O) 0.72727) + UO3 (x(O) 0.75) + O2GAS (x(O) 1)
UO-02Gue.tdb	2720.24	UO2_C1 (x(O) 0.68528) + ION (x(O) 0.71928) + GAS (x(O) 0.87743)
UO-02Gue.tdb	2718.6	ION (x(O) 0.0404) + ION#2 (x(O) 0.59458) + UO2_C1 (x(O) 0.62826)
UO-02Gue.tdb	2034.43	UO2_C1 (x(O) 0.69355) + U3O8_S4 (x(O) 0.72727) + GAS (x(O) 0.99623)
UO-02Gue.tdb	1407.99	ION (x(O) 0) + BCC_A2 (x(O) 0) + UO2_C1 (x(O) 0.66554)
UO-02Gue.tdb	1399.01	UO2_C1 (x(O) 0.69144) + U4O9_S3 (x(O) 0.69231) + U3O8_S4 (x(O) 0.72727)
UO-02Gue.tdb	1048.99	BCC_A2 (x(O) 0) + TETRAGONAL_U (x(O) 0) + UO2_C1 (x(O) 0.66657)
UO-02Gue.tdb	942.02	ORTHORHOMBIC_A20 (x(O) 0) + TETRAGONAL_U (x(O) 0) + UO2_C1 (x(O) 0.66663)
UO-02Gue.tdb	849.97	UO2_C1 (x(O) 0.67781) + U4O9_S2 (x(O) 0.69231) + U4O9_S3 (x(O) 0.69231)
UO-02Gue.tdb	849.97	U4O9_S3 (x(O) 0.69231) + U4O9_S2 (x(O) 0.69231) + U3O8_S4 (x(O) 0.72727)
UO-02Gue.tdb	830	U4O9_S2 (x(O) 0.69231) + U3O8_S4 (x(O) 0.72727) + U3O8_S3 (x(O) 0.72727)
UO-02Gue.tdb	568	U4O9_S2 (x(O) 0.69231) + U3O8_S3 (x(O) 0.72727) + U3O8_S2 (x(O) 0.72727)
UO-02Gue.tdb	483	U4O9_S2 (x(O) 0.69231) + U3O8_S1 (x(O) 0.72727) + U3O8_S2 (x(O) 0.72727)
UO-02Gue.tdb	348	UO2_C1 (x(O) 0.66667) + U4O9_S1 (x(O) 0.69231) + U4O9_S2 (x(O) 0.69231)
UO-02Gue.tdb	348	U4O9_S1 (x(O) 0.69231) + U4O9_S2 (x(O) 0.69231) + U3O8_S1 (x(O) 0.72727)
UO-04Che.tdb	3809.2	LIQUID (x(O) 0.22008) + LIQUID#2 (x(O) 0.49689) + GAS (x(O) 0.50942)
UO-04Che.tdb	3072.73	UO2_C1 (x(O) 0.67442) + LIQUID (x(O) 0.67892) + GAS (x(O) 0.77846)
UO-04Che.tdb	2698.43	LIQUID#2 (x(O) 0.03774) + LIQUID (x(O) 0.58556) + UO2_C1 (x(O) 0.6245)
UO-04Che.tdb	2152.67	UO2_C1 (x(O) 0.69165) + U3O8 (x(O) 0.72727) + GAS (x(O) 0.98635)
UO-04Che.tdb	1407.99	BCC_A2 (x(O) 0) + LIQUID (x(O) 0) + UO2_C1 (x(O) 0.66619)
UO-04Che.tdb	1048.99	TETRAGONAL_U (x(O) 0) + BCC_A2 (x(O) 0) + UO2_C1 (x(O) 0.66665)
UO-04Che.tdb	942.02	ORTHORHOMBIC_A20 (x(O) 0) + TETRAGONAL_U (x(O) 0) + UO2_C1 (x(O) 0.66666)
UO-04Che.tdb	941.79	U3O8 (x(O) 0.72727) + UO3 (x(O) 0.75) + GAS (x(O) 1)
UO-04Che.tdb	941.79	U3O8 (x(O) 0.72727) + UO3 (x(O) 0.75) + O2GAS (x(O) 1)
UO-08Bar.tdb	3809.21	LIQUID (x(O) 0.22007) + LIQUID#2 (x(O) 0.49691) + GAS (x(O) 0.50942)
UO-08Bar.tdb	2698.43	LIQUID#2 (x(O) 0.03774) + LIQUID (x(O) 0.58556) + UO2_C1 (x(O) 0.6245)
UO-08Bar.tdb	2673.5	UO2_C1 (x(O) 0.6829) + LIQUID (x(O) 0.70746) + GAS (x(O) 0.85996)
UO-08Bar.tdb	2152.2	UO2_C1 (x(O) 0.69166) + U3O8 (x(O) 0.72727) + GAS (x(O) 0.98641)
UO-08Bar.tdb	1407.99	BCC_A2 (x(O) 0) + LIQUID (x(O) 0) + UO2_C1 (x(O) 0.66619)
UO-08Bar.tdb	1048.99	TETRAGONAL_U (x(O) 0) + BCC_A2 (x(O) 0) + UO2_C1 (x(O) 0.66665)
UO-08Bar.tdb	942.02	ORTHORHOMBIC_A20 (x(O) 0) + TETRAGONAL_U (x(O) 0) + UO2_C1 (x(O) 0.66666)
UO-08Bar.tdb	941.79	U3O8 (x(O) 0.72727) + UO3 (x(O) 0.75) + GAS (x(O) 1)
UO-08Bar.tdb	941.79	U3O8 (x(O) 0.72727) + UO3 (x(O) 0.75) + O2GAS (x(O) 1)
UO-11Gue.tdb	2708.16	ION (x(O) 0.03821) + ION#2 (x(O) 0.59649) + UO2_WILD (x(O) 0.62404)
UO-11Gue.tdb	2522.7	UO2_WILD (x(O) 0.68557) + ION (x(O) 0.73055) + GAS (x(O) 0.9349)
UO-11Gue.tdb	2008.56	UO2_WILD (x(O) 0.69156) + U3O8_S4 (x(O) 0.72727) + GAS (x(O) 0.99711)
UO-11Gue.tdb	1407.99	ION (x(O) 0) + BCC_A2 (x(O) 0) + UO2_WILD (x(O) 0.66571)
UO-11Gue.tdb	1407.99	BCC_A2 (x(O) 0) + ION (x(O) 0) + UO2_C1 (x(O) 0.66571)
UO-11Gue.tdb	1404.17	UO2_WILD (x(O) 0.69128) + U4O9_S3 (x(O) 0.69231) + U3O8_S4 (x(O) 0.72727)
UO-11Gue.tdb	1404.17	UO2_C1 (x(O) 0.69128) + U4O9_S3 (x(O) 0.69231) + U3O8_S4 (x(O) 0.72727)
UO-11Gue.tdb	1048.99	BCC_A2 (x(O) 0) + TETRAGONAL_U (x(O) 0) + UO2_WILD (x(O) 0.66655)
UO-11Gue.tdb	1048.99	TETRAGONAL_U (x(O) 0) + BCC_A2 (x(O) 0) + UO2_C1 (x(O) 0.66655)
UO-11Gue.tdb	942.02	ORTHORHOMBIC_A20 (x(O) 0) + TETRAGONAL_U (x(O) 0) + UO2_C1 (x(O) 0.66662)
UO-11Gue.tdb	942.02	TETRAGONAL_U (x(O) 0) + ORTHORHOMBIC_A20 (x(O) 0) + UO2_WILD (x(O) 0.66662)
UO-11Gue.tdb	850	UO2_C1 (x(O) 0.6777) + U4O9_S2 (x(O) 0.69231) + U4O9_S3 (x(O) 0.69231)
UO-11Gue.tdb	850	U4O9_S3 (x(O) 0.69231) + U4O9_S2 (x(O) 0.69231) + U3O8_S4 (x(O) 0.72727)
UO-11Gue.tdb	850	UO2_WILD (x(O) 0.6777) + U4O9_S3 (x(O) 0.69231) + U4O9_S2 (x(O) 0.69231)
UO-11Gue.tdb	830	U4O9_S2 (x(O) 0.69231) + U3O8_S4 (x(O) 0.72727) + U3O8_S3 (x(O) 0.72727)
UO-11Gue.tdb	568	U4O9_S2 (x(O) 0.69231) + U3O8_S3 (x(O) 0.72727) + U3O8_S2 (x(O) 0.72727)
UO-11Gue.tdb	483	U4O9_S2 (x(O) 0.69231) + U3O8_S1 (x(O) 0.72727) + U3O8_S2 (x(O) 0.72727)
UO-11Gue.tdb	348	UO2_C1 (x(O) 0.66671) + U4O9_S1 (x(O) 0.69231) + U4O9_S2 (x(O) 0.69231)
UO-11Gue.tdb	348	U4O9_S1 (x(O) 0.69231) + U4O9_S2 (x(O) 0.69231) + U3O8_S1 (x(O) 0.72727)
UO-11Gue.tdb	348	UO2_WILD (x(O) 0.66671) + U4O9_S2 (x(O) 0.69231) + U4O9_S1 (x(O) 0.69231)
UO-23Jia.tdb	2682.78	UO2_C1 (x(O) 0.68143) + LIQUID (x(O) 0.7072) + GAS (x(O) 0.85795)
UO-23Jia.tdb	2653.82	LIQUID (x(O) 0.02872) + LIQUID#2 (x(O) 0.57402) + UO2_C1 (x(O) 0.62425)
UO-23Jia.tdb	2165.88	UO2_C1 (x(O) 0.68832) + U3O8 (x(O) 0.72727) + GAS (x(O) 0.98476)
UO-23Jia.tdb	1407.99	BCC_A2 (x(O) 0) + LIQUID (x(O) 0) + UO2_C1 (x(O) 0.66654)
UO-23Jia.tdb	1387.38	UO2_C1 (x(O) 0.68868) + U4O9 (x(O) 0.69231) + U3O8 (x(O) 0.72727)
UO-23Jia.tdb	1387.38	UO2_C1 (x(O) 0.68868) + U4O9 (x(O) 0.69231) + U3O8 (x(O) 0.72727)
UO-23Jia.tdb	1048.99	TETRAGONAL_U (x(O) 0) + BCC_A2 (x(O) 0) + UO2_C1 (x(O) 0.66667)
UO-23Jia.tdb	942.02	ORTHORHOMBIC_A20 (x(O) 0) + TETRAGONAL_U (x(O) 0) + UO2_C1 (x(O) 0.66667)
UO-23Jia.tdb	941.79	U3O8 (x(O) 0.72727) + UO3 (x(O) 0.75) + GAS (x(O) 1)
UO-23Jia.tdb	941.79	U3O8 (x(O) 0.72727) + UO3 (x(O) 0.75) + O2GAS (x(O) 1)

Please cite

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 data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23736065

Also cite 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; 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). 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_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_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}
}