Pu–Th phases

9 phases (tier A 4, liquid 1, needs_review 4); 9 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: interactive registry · full JSON · Pu–Th system page · Markdown · field reference

Phases of the Pu–Th system (9)
Phase	Structure	Basis	Stability (calculated)	TDB models
TETRAGONAL_A6 phase:pu-th:a6-tetragonal	In · A6 · tI2 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 699.1–764.1 K, x(Th) 0–0.01149	1
FCC_A1 phase:pu-th:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1633.19 K, x(Th) 0–1	1
LIQUID phase:pu-th:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 838.82–4000 K, x(Th) 0–1	1
ALPHA_PU phase:pu-th:pu-alpha		needs_review	stable in 1 of 1 calculated diagram(s): 300–397.62 K, x(Th) 0–0	1
BCC_PU phase:pu-th:pu-bcc	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 753.1–913 K, x(Th) 0–0.03412	1
BETA_PU phase:pu-th:pu-beta		needs_review	stable in 1 of 1 calculated diagram(s): 397.62–487.9 K, x(Th) 0–0	1
GAMMA_PU phase:pu-th:pu-gamma		needs_review	stable in 1 of 1 calculated diagram(s): 487.9–788.55 K, x(Th) 0–0	1
PU7TH3 phase:pu-th:pu7th3		needs_review	stable in 1 of 1 calculated diagram(s): 300–883 K, x(Th) 0.3–0.3	1
BCC_TH phase:pu-th:th-bcc	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 877.78–3999.24 K, x(Th) 0.46549–1	1

TETRAGONAL_A6 (Pu–Th)

Id: phase:pu-th:a6-tetragonal; status assigned
Structure: In · A6 · tI2 · I4/mmm (139); type st:a6-in-ti2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 699.1–764.1 K, x(Th) 0–0.01149
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pu-th:a6-tetragonal
tdb: tdb:PuTh-14Ben.tdb:TETRAGONAL_A6

TDB models of TETRAGONAL_A6 (1): PHASE and CONSTITUENT statements as written

PuTh-14Ben.tdb: TETRAGONAL_A6, type code %, sha256 90a9babb3ad9d9a5…

54: PHASE TETRAGONAL_A6 % 1 1 !
55: CONST TETRAGONAL_A6 : PU% TH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.02.001 O. Beneš, D. Manara, R.J.M. Konings, Thermodynamic assessment of the Th–U–Pu system, Journal of Nuclear Materials 449, 15-22 (2014).
assessment that models this phase

FCC_A1 (Pu–Th)

Id: phase:pu-th:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1633.19 K, x(Th) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pu-th:fcc-a1
tdb: tdb:PuTh-14Ben.tdb:FCC_A1

TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

PuTh-14Ben.tdb: FCC_A1, type code %A, sha256 90a9babb3ad9d9a5…

34: PHASE FCC_A1 %A 2 1 1 !
35: CONST FCC_A1 : PU% TH% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.02.001 O. Beneš, D. Manara, R.J.M. Konings, Thermodynamic assessment of the Th–U–Pu system, Journal of Nuclear Materials 449, 15-22 (2014).
assessment that models this phase

LIQUID (Pu–Th)

Id: phase:pu-th:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 838.82–4000 K, x(Th) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pu-th:liquid
tdb: tdb:PuTh-14Ben.tdb:LIQUID

TDB models of LIQUID (1): PHASE and CONSTITUENT statements as written

PuTh-14Ben.tdb: LIQUID, type code %, sha256 90a9babb3ad9d9a5…

29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : PU TH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.02.001 O. Beneš, D. Manara, R.J.M. Konings, Thermodynamic assessment of the Th–U–Pu system, Journal of Nuclear Materials 449, 15-22 (2014).
assessment that models this phase

ALPHA_PU (Pu–Th)

Id: phase:pu-th:pu-alpha; status needs_review
No structure assigned. Why: no_structure_token; unary_composition
Candidate (sgte_mmc2): alpha-Pu · mP16 · P2_1/m (11) — Hallstedt 2025 mmc2 row for ALPHA_PU: Pu (alpha)
Candidate (tdb_comment): alpha-Pu · mP16 · P2_1/m — PuTh-14Ben.tdb: 'Prototype alpha-Pu (mP16, P2_1/m)'
Stoichiometry: Pu 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–397.62 K, x(Th) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pu-th:pu-alpha
tdb: tdb:PuTh-14Ben.tdb:ALPHA_PU

TDB models of ALPHA_PU (1): PHASE and CONSTITUENT statements as written

PuTh-14Ben.tdb: ALPHA_PU, type code %, sha256 90a9babb3ad9d9a5…

59: PHASE ALPHA_PU % 1 1 !
60: CONST ALPHA_PU : PU% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.02.001 O. Beneš, D. Manara, R.J.M. Konings, Thermodynamic assessment of the Th–U–Pu system, Journal of Nuclear Materials 449, 15-22 (2014).
assessment that models this phase

BCC_PU (Pu–Th)

Id: phase:pu-th:pu-bcc; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 753.1–913 K, x(Th) 0–0.03412
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pu-th:pu-bcc
tdb: tdb:PuTh-14Ben.tdb:BCC_PU

TDB models of BCC_PU (1): PHASE and CONSTITUENT statements as written

PuTh-14Ben.tdb: BCC_PU, type code %B, sha256 90a9babb3ad9d9a5…

44: PHASE BCC_PU %B 2 1 3 !
45: CONST BCC_PU : PU% TH : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.02.001 O. Beneš, D. Manara, R.J.M. Konings, Thermodynamic assessment of the Th–U–Pu system, Journal of Nuclear Materials 449, 15-22 (2014).
assessment that models this phase

BETA_PU (Pu–Th)

Id: phase:pu-th:pu-beta; status needs_review
No structure assigned. Why: no_structure_token; unary_composition
Candidate (sgte_mmc2): beta-Pu · mC34 · C2/m (12) — Hallstedt 2025 mmc2 row for BETA_PU: Pu (beta)
Candidate (tdb_comment): beta-Pu · mC34 · C2/m — PuTh-14Ben.tdb: 'Prototype beta-Pu (mC34, C2/m)'
Stoichiometry: Pu 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 397.62–487.9 K, x(Th) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pu-th:pu-beta
tdb: tdb:PuTh-14Ben.tdb:BETA_PU

TDB models of BETA_PU (1): PHASE and CONSTITUENT statements as written

PuTh-14Ben.tdb: BETA_PU, type code %, sha256 90a9babb3ad9d9a5…

64: PHASE BETA_PU % 1 1 !
65: CONST BETA_PU : PU% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.02.001 O. Beneš, D. Manara, R.J.M. Konings, Thermodynamic assessment of the Th–U–Pu system, Journal of Nuclear Materials 449, 15-22 (2014).
assessment that models this phase

GAMMA_PU (Pu–Th)

Id: phase:pu-th:pu-gamma; status needs_review
No structure assigned. Why: no_structure_token; unary_composition
Candidate (sgte_mmc2): gamma-Pu · oF8 · Fddd (70) — Hallstedt 2025 mmc2 row for GAMMA_PU: Hg4In, Pu (gamma)
Candidate (tdb_comment): gamma-Pu · oF8 · Fddd — PuTh-14Ben.tdb: 'Prototype gamma-Pu (oF8, Fddd)'
Stoichiometry: Pu 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 487.9–788.55 K, x(Th) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pu-th:pu-gamma
tdb: tdb:PuTh-14Ben.tdb:GAMMA_PU

TDB models of GAMMA_PU (1): PHASE and CONSTITUENT statements as written

PuTh-14Ben.tdb: GAMMA_PU, type code %, sha256 90a9babb3ad9d9a5…

69: PHASE GAMMA_PU % 1 1 !
70: CONST GAMMA_PU : PU% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.02.001 O. Beneš, D. Manara, R.J.M. Konings, Thermodynamic assessment of the Th–U–Pu system, Journal of Nuclear Materials 449, 15-22 (2014).
assessment that models this phase

PU7TH3 (Pu–Th)

Id: phase:pu-th:pu7th3; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Pu7Th3) — Hallstedt 2025 mmc2 row for PU7TH3: Pu7Th3
Stoichiometry: Pu 0.7000, Th 0.3000
Stability: stable in 1 of 1 calculated diagram(s): 300–883 K, x(Th) 0.3–0.3
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pu-th:pu7th3
tdb: tdb:PuTh-14Ben.tdb:PU7TH3

TDB models of PU7TH3 (1): PHASE and CONSTITUENT statements as written

PuTh-14Ben.tdb: PU7TH3, type code %, sha256 90a9babb3ad9d9a5…

74: PHASE PU7TH3 % 2 7 3 !
75: CONST PU7TH3 : PU : TH : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.02.001 O. Beneš, D. Manara, R.J.M. Konings, Thermodynamic assessment of the Th–U–Pu system, Journal of Nuclear Materials 449, 15-22 (2014).
assessment that models this phase

BCC_TH (Pu–Th)

Id: phase:pu-th:th-bcc; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 877.78–3999.24 K, x(Th) 0.46549–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pu-th:th-bcc
tdb: tdb:PuTh-14Ben.tdb:BCC_TH

TDB models of BCC_TH (1): PHASE and CONSTITUENT statements as written

PuTh-14Ben.tdb: BCC_TH, type code %B, sha256 90a9babb3ad9d9a5…

49: PHASE BCC_TH %B 2 1 3 !
50: CONST BCC_TH : PU TH% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2014.02.001 O. Beneš, D. Manara, R.J.M. Konings, Thermodynamic assessment of the Th–U–Pu system, Journal of Nuclear Materials 449, 15-22 (2014).
assessment that models this phase

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735970
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; 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); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work). 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_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  note      = {Version 1, machine-extracted}
}

@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}
}