Al–Th phases

11 phases (tier A 8, tier C 1, liquid 1, needs_review 1); 10 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 · Al–Th system page · Markdown · field reference

Phases of the Al–Th system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
AL2TH_C32 phase:al-th:al2th-c32	AlB2 · C32 · hP3 · P6/mmm (191)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1791.09 K, x(Th) 0.33333–0.33333	8	1
AL2TH3_D5A phase:al-th:al2th3-d5a	Si2U3 · D5_a · tP10 · P4/mbm (127)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1344.18–1572.16 K, x(Th) 0.6–0.6	8	1
AL3TH_D019 phase:al-th:al3th-d019	Ni3Sn · D0_19 · hP8 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1394.13 K, x(Th) 0.25–0.25	4	1
AL3TH2 phase:al-th:al3th2		needs_review	stable in 1 of 1 calculated diagram(s): 1377.34–1666.62 K, x(Th) 0.4–0.4	6	1
AL7TH2 phase:al-th:al7th2	Al7Th2 · oP18 · Pbam (55)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1151.47 K, x(Th) 0.22222–0.22222	4	1
ALTH_B33 phase:al-th:alth-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1589.61 K, x(Th) 0.5–0.5	8	1
ALTH2_C16 phase:al-th:alth2-c16	Al2Cu · C16 · tI12 · I4/mcm (140)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1582.7 K, x(Th) 0.66667–0.66667	8	1
BCC_A2 phase:al-th:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1629.17–3999.24 K, x(Th) 0.98629–1	2	1
FCC_A1 phase:al-th:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1664.67 K, x(Th) 0–1	6	1
HCP_A3 phase:al-th:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LIQUID phase:al-th:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 901.27–4000 K, x(Th) 0–1	24	1

AL2TH_C32 (Al–Th)

Id: phase:al-th:al2th-c32; status assigned
Structure: AlB2 · C32 · hP3 · P6/mmm (191); type st:c32-alb2-hp3; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaazt and oqmd-3101, space group 191
Stoichiometry: Al 0.6667, Th 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1791.09 K, x(Th) 0.33333–0.33333
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:al-th:al2th-c32
mp: mp:mp-aaaaaazt
oqmd: oqmd:oqmd-3101
paper: paper:10.1016/j.jnucmat.2009.10.068:ThAl2
tdb: tdb:AlTh-10Li.tdb:AL2TH_C32

TDB models of AL2TH_C32 (1): PHASE and CONSTITUENT statements as written

AlTh-10Li.tdb: AL2TH_C32, type code %, sha256 dc195f386a4b4675…

59: PHASE AL2TH_C32 % 2 2 1 !
60: CONST AL2TH_C32 : AL : TH : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02882381 M. E. Kassner, D. E. Peterson, The Al−Th (Aluminum-Thorium) system, Bulletin of Alloy Phase Diagrams 10, 466-470 (1989).
cited as the source of values for this phase

AL2TH3_D5A (Al–Th)

Id: phase:al-th:al2th3-d5a; status assigned
Structure: Si2U3 · D5_a · tP10 · P4/mbm (127); type st:d5-a-si2u3-tp10; tier A: standard phase name; confidence high
Stoichiometry: Al 0.4000, Th 0.6000
Stability: stable in 1 of 1 calculated diagram(s): 1344.18–1572.16 K, x(Th) 0.6–0.6
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-th:al2th3-d5a
paper: paper:10.1016/j.jnucmat.2009.10.068:Th3Al2
tdb: tdb:AlTh-10Li.tdb:AL2TH3_D5A

TDB models of AL2TH3_D5A (1): PHASE and CONSTITUENT statements as written

AlTh-10Li.tdb: AL2TH3_D5A, type code %, sha256 dc195f386a4b4675…

74: PHASE AL2TH3_D5A % 2 2 3 !
75: CONST AL2TH3_D5A : AL : TH : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02882381 M. E. Kassner, D. E. Peterson, The Al−Th (Aluminum-Thorium) system, Bulletin of Alloy Phase Diagrams 10, 466-470 (1989).
cited as the source of values for this phase

AL3TH_D019 (Al–Th)

Id: phase:al-th:al3th-d019; status assigned
Structure: Ni3Sn · D0_19 · hP8 · P6_3/mmc (194); type st:d0-19-ni3sn-hp8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaabyg and oqmd-10596, space group 194
Stoichiometry: Al 0.7500, Th 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–1394.13 K, x(Th) 0.25–0.25
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:al-th:al3th-d019
mp: mp:mp-aaaaabyg
oqmd: oqmd:oqmd-10596
paper: paper:10.1016/j.jnucmat.2009.10.068:ThAl3
tdb: tdb:AlTh-10Li.tdb:AL3TH_D019

TDB models of AL3TH_D019 (1): PHASE and CONSTITUENT statements as written

AlTh-10Li.tdb: AL3TH_D019, type code %, sha256 dc195f386a4b4675…

54: PHASE AL3TH_D019 % 2 3 1 !
55: CONST AL3TH_D019 : AL : TH : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02882381 M. E. Kassner, D. E. Peterson, The Al−Th (Aluminum-Thorium) system, Bulletin of Alloy Phase Diagrams 10, 466-470 (1989).
cited as the source of values for this phase

AL3TH2 (Al–Th)

Id: phase:al-th:al3th2; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (Al3Th2) · tP20 — printed with a label mapped to this phase
Candidate (sgte_mmc2): (Al3Th2) · tP20 — Hallstedt 2025 mmc2 row for AL3TH2: Al3Th2
Stoichiometry: Al 0.6000, Th 0.4000
Stability: stable in 1 of 1 calculated diagram(s): 1377.34–1666.62 K, x(Th) 0.4–0.4
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-th:al3th2
paper: paper:10.1016/j.jnucmat.2009.10.068:Th2Al3
tdb: tdb:AlTh-10Li.tdb:AL3TH2

TDB models of AL3TH2 (1): PHASE and CONSTITUENT statements as written

AlTh-10Li.tdb: AL3TH2, type code %, sha256 dc195f386a4b4675…

64: PHASE AL3TH2 % 2 3 2 !
65: CONST AL3TH2 : AL : TH : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02882381 M. E. Kassner, D. E. Peterson, The Al−Th (Aluminum-Thorium) system, Bulletin of Alloy Phase Diagrams 10, 466-470 (1989).
cited as the source of values for this phase

AL7TH2 (Al–Th)

Id: phase:al-th:al7th2; status assigned
Structure: Al7Th2 · oP18 · Pbam (55); type st:al7th2-op18; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Al 0.7778, Th 0.2222
Stability: stable in 1 of 1 calculated diagram(s): 300–1151.47 K, x(Th) 0.22222–0.22222
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-th:al7th2
paper: paper:10.1016/j.jnucmat.2009.10.068:Th2Al7
tdb: tdb:AlTh-10Li.tdb:AL7TH2

TDB models of AL7TH2 (1): PHASE and CONSTITUENT statements as written

AlTh-10Li.tdb: AL7TH2, type code %, sha256 dc195f386a4b4675…

49: PHASE AL7TH2 % 2 7 2 !
50: CONST AL7TH2 : AL : TH : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02882381 M. E. Kassner, D. E. Peterson, The Al−Th (Aluminum-Thorium) system, Bulletin of Alloy Phase Diagrams 10, 466-470 (1989).
cited as the source of values for this phase

ALTH_B33 (Al–Th)

Id: phase:al-th:alth-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; tier A: standard phase name; confidence high
Stoichiometry: Al 0.5000, Th 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1589.61 K, x(Th) 0.5–0.5
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-th:alth-b33
paper: paper:10.1016/j.jnucmat.2009.10.068:ThAl
tdb: tdb:AlTh-10Li.tdb:ALTH_B33

TDB models of ALTH_B33 (1): PHASE and CONSTITUENT statements as written

AlTh-10Li.tdb: ALTH_B33, type code %, sha256 dc195f386a4b4675…

69: PHASE ALTH_B33 % 2 1 1 !
70: CONST ALTH_B33 : AL : TH : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02882381 M. E. Kassner, D. E. Peterson, The Al−Th (Aluminum-Thorium) system, Bulletin of Alloy Phase Diagrams 10, 466-470 (1989).
cited as the source of values for this phase

ALTH2_C16 (Al–Th)

Id: phase:al-th:alth2-c16; status assigned
Structure: Al2Cu · C16 · tI12 · I4/mcm (140); type st:c16-al2cu-ti12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaacln and oqmd-10593, space group 140
Stoichiometry: Al 0.3333, Th 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1582.7 K, x(Th) 0.66667–0.66667
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:al-th:alth2-c16
mp: mp:mp-aaaaacln
oqmd: oqmd:oqmd-10593
paper: paper:10.1016/j.jnucmat.2009.10.068:Th2Al
tdb: tdb:AlTh-10Li.tdb:ALTH2_C16

TDB models of ALTH2_C16 (1): PHASE and CONSTITUENT statements as written

AlTh-10Li.tdb: ALTH2_C16, type code %, sha256 dc195f386a4b4675…

79: PHASE ALTH2_C16 % 2 1 2 !
80: CONST ALTH2_C16 : AL : TH : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02882381 M. E. Kassner, D. E. Peterson, The Al−Th (Aluminum-Thorium) system, Bulletin of Alloy Phase Diagrams 10, 466-470 (1989).
cited as the source of values for this phase

BCC_A2 (Al–Th)

Id: phase:al-th:bcc-a2; 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): 1629.17–3999.24 K, x(Th) 0.98629–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-th:bcc-a2
paper: paper:10.1016/j.jnucmat.2009.10.068:βTh
tdb: tdb:AlTh-10Li.tdb:BCC_A2

TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written

AlTh-10Li.tdb: BCC_A2, type code %, sha256 dc195f386a4b4675…

39: PHASE BCC_A2 % 2 1 3 !
40: CONST BCC_A2 : AL TH% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02882381 M. E. Kassner, D. E. Peterson, The Al−Th (Aluminum-Thorium) system, Bulletin of Alloy Phase Diagrams 10, 466-470 (1989).
cited as the source of values for this phase

FCC_A1 (Al–Th)

Id: phase:al-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): 300–1664.67 K, x(Th) 0–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-th:fcc-a1
paper: paper:10.1016/j.jnucmat.2009.10.068:(Al), paper:10.1016/j.jnucmat.2009.10.068:αTh
tdb: tdb:AlTh-10Li.tdb:FCC_A1

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

AlTh-10Li.tdb: FCC_A1, type code %, sha256 dc195f386a4b4675…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02882381 M. E. Kassner, D. E. Peterson, The Al−Th (Aluminum-Thorium) system, Bulletin of Alloy Phase Diagrams 10, 466-470 (1989).
cited as the source of values for this phase

HCP_A3 (Al–Th)

Id: phase:al-th:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stoichiometry: Al 1.0000
Stability: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:al-th:hcp-a3
tdb: tdb:AlTh-10Li.tdb:HCP_A3

TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

AlTh-10Li.tdb: HCP_A3, type code %, sha256 dc195f386a4b4675…

44: PHASE HCP_A3 % 2 1 0.5 !
45: CONST HCP_A3 : AL : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase

LIQUID (Al–Th)

Id: phase:al-th:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 901.27–4000 K, x(Th) 0–1
Literature: 24 values (24 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-th:liquid
paper: paper:10.1016/j.jnucmat.2009.10.068:L
tdb: tdb:AlTh-10Li.tdb:LIQUID

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

AlTh-10Li.tdb: LIQUID, type code %, sha256 dc195f386a4b4675…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.10.068 Z.S. Li, X.J. Liu, M.Z. Wen, C.P. Wang, A.T. Tang, F.S. Pan, Thermodynamic assessments of the Al–Th and Th–Zn systems, Journal of Nuclear Materials 396, 170-175 (2010).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02882381 M. E. Kassner, D. E. Peterson, The Al−Th (Aluminum-Thorium) system, Bulletin of Alloy Phase Diagrams 10, 466-470 (1989).
cited as the source of values for 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}
}