Pu–U system

6 accepted literature values from 1 paper(s) (experimental 3, model 3); 4 calculated phase diagram(s). 2 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 (12) · papers (bibliography) · Markdown

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

Accepted values by property group
Property group	Values
heat capacity / entropy / enthalpy	6

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
PuU-10Kur.tdb	M. Kurata, IOP Conf. Ser.: Mater. Sci. Eng., 9, 012022(2010).	`ae973a5f25fff5bd033b8dff9e46729f02bd72f047d46f5f8f4ffacd93b5b5fa`	viewer · TDB · JSON
PuU-15Per.tdb	A. Perron, P.E.A. Turchi, A. Landa, P. Soderlind, B. Ravat, B. Oudot, F. Delaunay, J. Nucl. Mater., 458, 425-41(2015). doi:10.1016/j.jnucmat.2014.12.101	`b2766bcd4fb5f7f589f31d56f77d51147d22fdb177fb21b4a7215f3f94bd0ad5`	viewer · TDB · JSON
PuU-23Fou.tdb	P. Fouquet-Metivier, P.M. Martin, D. Manara, K. Dardenne, J. Rothe, P.C.M. Fossati, C. Gueneau, Calphad, 80, 102523(2023). doi:10.1016/j.calphad.2022.102523	`b15fc83561b2855604b98968affcc9bb7e3b7aa5cb93f3c392bdf75fd3ca7897`	viewer · TDB · JSON
PuU-99Kur.tdb	M. Kurata, Calphad, 23, 305-37(1999). doi:10.1016/S0364-5916(00)00004-3	`f7466d1c08e571115d2e08747bda9b6f11c2f8c9d1d955556c18109bf13bf340`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
PuU-10Kur.tdb	975.28	BCC_A2 (x(U) 0.67291) + PUU_ETA (x(U) 0.72933) + TETRAGONAL_U (x(U) 0.78749)
PuU-10Kur.tdb	866.19	PUU_ETA (x(U) 0.73466) + PUU_ZETA (x(U) 0.7426) + TETRAGONAL_U (x(U) 0.79617)
PuU-10Kur.tdb	841.05	PUU_ZETA (x(U) 0.76791) + TETRAGONAL_U (x(U) 0.82535) + ORTHORHOMBIC_A20 (x(U) 0.87179)
PuU-10Kur.tdb	728.05	TETRAGONAL_A6 (x(U) 0.01458) + BCC_A2 (x(U) 0.02485) + PUU_ETA (x(U) 0.04422)
PuU-10Kur.tdb	713.15	FCC_A1 (x(U) 0.01259) + TETRAGONAL_A6 (x(U) 0.01307) + PUU_ETA (x(U) 0.04104)
PuU-10Kur.tdb	593.43	FCC_A1 (x(U) 0.00284) + GAMMA_PU (x(U) 0.00294) + PUU_ETA (x(U) 0.01304)
PuU-10Kur.tdb	485.97	BETA_PU (x(U) 0.00265) + GAMMA_PU (x(U) 0.00312) + PUU_ETA (x(U) 0.01544)
PuU-10Kur.tdb	450.47	BETA_PU (x(U) 0.00449) + PUU_ETA (x(U) 0.02721) + PUU_ZETA (x(U) 0.14262)
PuU-10Kur.tdb	397.62	BETA_PU (x(U) 0.00225) + ALPHA_PU (x(U) 0.00225) + PUU_ZETA (x(U) 0.14407)
PuU-15Per.tdb	980.56	BCC_A2 (x(U) 0.69633) + PUU_ETA (x(U) 0.71207) + TETRAGONAL_U (x(U) 0.73153)
PuU-15Per.tdb	862.22	PUU_ETA (x(U) 0.74013) + PUU_ZETA (x(U) 0.74134) + TETRAGONAL_U (x(U) 0.75768)
PuU-15Per.tdb	833.33	PUU_ZETA (x(U) 0.76461) + TETRAGONAL_U (x(U) 0.83253) + ORTHORHOMBIC_A20 (x(U) 0.87526)
PuU-15Per.tdb	729.7	TETRAGONAL_A6 (x(U) 0.00391) + BCC_A2 (x(U) 0.01408) + PUU_ETA (x(U) 0.02018)
PuU-15Per.tdb	715.87	FCC_A1 (x(U) 0.00332) + TETRAGONAL_A6 (x(U) 0.00375) + PUU_ETA (x(U) 0.02005)
PuU-15Per.tdb	591.26	GAMMA_PU (x(U) 0.00206) + FCC_A1 (x(U) 0.0025) + PUU_ETA (x(U) 0.02262)
PuU-15Per.tdb	553.62	GAMMA_PU (x(U) 0.00264) + BETA_PU (x(U) 0.01593) + PUU_ETA (x(U) 0.03349)
PuU-15Per.tdb	551.71	BETA_PU (x(U) 0.01665) + PUU_ETA (x(U) 0.03502) + PUU_ZETA (x(U) 0.30998)
PuU-15Per.tdb	397.46	ALPHA_PU (x(U) 0) + BETA_PU (x(U) 4.300e-4) + PUU_ZETA (x(U) 0.27107)
PuU-23Fou.tdb	956.63	BCC_A2 (x(U) 0.65942) + PUU_ETA (x(U) 0.67471) + TETRAGONAL_U (x(U) 0.68067)
PuU-23Fou.tdb	854.59	PUU_ZETA (x(U) 0.73703) + PUU_ETA (x(U) 0.77956) + TETRAGONAL_U (x(U) 0.79439)
PuU-23Fou.tdb	840.59	PUU_ZETA (x(U) 0.74749) + TETRAGONAL_U (x(U) 0.82026) + ORTHORHOMBIC_A20 (x(U) 0.86227)
PuU-23Fou.tdb	712.8	FCC_A1 (x(U) 0.00375) + BCC_A2 (x(U) 0.02173) + PUU_ETA (x(U) 0.03566)
PuU-23Fou.tdb	589.42	GAMMA_PU (x(U) 0) + FCC_A1 (x(U) 9.000e-4) + PUU_ETA (x(U) 0.01322)
PuU-23Fou.tdb	525.69	GAMMA_PU (x(U) 0) + BETA_PU (x(U) 0.00825) + PUU_ETA (x(U) 0.01952)
PuU-23Fou.tdb	504.5	BETA_PU (x(U) 0.01323) + PUU_ETA (x(U) 0.03103) + PUU_ZETA (x(U) 0.26574)
PuU-23Fou.tdb	396.75	ALPHA_PU (x(U) 0) + BETA_PU (x(U) 0.00245) + PUU_ZETA (x(U) 0.2621)
PuU-99Kur.tdb	974.11	BCC_A2 (x(U) 0.72827) + PUU_ETA (x(U) 0.73473) + TETRAGONAL_U (x(U) 0.74801)
PuU-99Kur.tdb	867.91	PUU_ZETA (x(U) 0.71816) + PUU_ETA (x(U) 0.73935) + TETRAGONAL_U (x(U) 0.75411)
PuU-99Kur.tdb	840.59	PUU_ZETA (x(U) 0.74749) + TETRAGONAL_U (x(U) 0.82026) + ORTHORHOMBIC_A20 (x(U) 0.86227)
PuU-99Kur.tdb	731.61	TETRAGONAL_A6 (x(U) 0.00438) + BCC_A2 (x(U) 0.01392) + PUU_ETA (x(U) 0.02068)
PuU-99Kur.tdb	716.26	FCC_A1 (x(U) 0.00384) + TETRAGONAL_A6 (x(U) 0.00426) + PUU_ETA (x(U) 0.02058)
PuU-99Kur.tdb	593.06	GAMMA_PU (x(U) 0.00338) + FCC_A1 (x(U) 0.00338) + PUU_ETA (x(U) 0.02344)
PuU-99Kur.tdb	552.19	GAMMA_PU (x(U) 0.00478) + BETA_PU (x(U) 0.01784) + PUU_ETA (x(U) 0.03593)
PuU-99Kur.tdb	544.8	BETA_PU (x(U) 0.0212) + PUU_ETA (x(U) 0.04235) + PUU_ZETA (x(U) 0.26981)
PuU-99Kur.tdb	396.75	ALPHA_PU (x(U) 0) + BETA_PU (x(U) 0.00245) + PUU_ZETA (x(U) 0.2621)

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull PuU-10Kur · CALPHAD hull PuU-15Per · CALPHAD hull PuU-99Kur

Other properties

Heat capacity / entropy / enthalpy (6)

Heat capacity / entropy / enthalpy, Pu–U system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Heat capacity printed: Cp	38.5 J/mol-atom/K	673	α alloy: Pu 0.1, U 0.9	experimental	[1] Kurata 1999 cites ref. 11Chi	Table 3, p. 17, row 2 report
Heat capacity printed: Cp	37.5 J/mol-atom/K	673	α alloy: Pu 0.1, U 0.9	model	[1] Kurata 1999	Table 3, p. 17, row 1 report
Heat capacity printed: Cp	42.1 J/mol-atom/K	773	α alloy: Pu 0.1, U 0.9	experimental	[1] Kurata 1999 cites ref. 11Chi	Table 3, p. 17, row 4 report
Heat capacity printed: Cp	40.8 J/mol-atom/K	773	α alloy: Pu 0.1, U 0.9	model	[1] Kurata 1999	Table 3, p. 17, row 3 report
Heat capacity printed: Cp	44.5 J/mol-atom/K	840	α alloy: Pu 0.1, U 0.9	experimental	[1] Kurata 1999 cites ref. 11Chi	Table 3, p. 17, row 6 report
Heat capacity printed: Cp	43.3 J/mol-atom/K	840	α alloy: Pu 0.1, U 0.9	model	[1] Kurata 1999	Table 3, p. 17, row 5 report

Sources

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

Masaki Kurata, Thermodynamic assessment of the Pu-U, Pu-Zr, and Pu-U-Zr systems, Calphad 23, 305-337 (1999). doi:10.1016/s0364-5916(00)00004-3

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}
}