Al–Pu phases

17 phases (tier A 8, tier C 1, liquid 1, needs_review 7); 16 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–Pu system page · Markdown · field reference

Phases of the Al–Pu system (17)
Phase	Structure	Basis	Stability (calculated)	TDB models
TETRAGONAL_A6 phase:al-pu:a6-tetragonal	In · A6 · tI2 · I4/mmm (139)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 600.31–1320.51 K, x(Pu) 1–1	3
AL2PU_C15 phase:al-pu:al2pu-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1957.35 K, x(Pu) 0.33333–0.33333	3
AL3PU_6H phase:al-pu:al3pu-6h		needs_review	stable in 3 of 3 calculated diagram(s): 1299.99–1500.02 K, x(Pu) 0.25–0.25	3
AL3PU_9H phase:al-pu:al3pu-9h		needs_review	stable in 1 of 1 calculated diagram(s): 300–1299.99 K, x(Pu) 0.25–0.25	1
AL3PU_9HA phase:al-pu:al3pu-9ha		needs_review	stable in 2 of 2 calculated diagram(s): 300–1200 K, x(Pu) 0.25–0.25	2
AL3PU_9HB phase:al-pu:al3pu-9hb		needs_review	stable in 2 of 2 calculated diagram(s): 1200–1300 K, x(Pu) 0.25–0.25	2
AL3PU_L12 phase:al-pu:al3pu-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 1450–1718.42 K, x(Pu) 0.25–0.25	3
AL4PU_D1B phase:al-pu:al4pu-d1b	Al4U · D1_b · oI20 · Imma (74)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1222.13 K, x(Pu) 0.2–0.2	3
ALPU_A12 phase:al-pu:alpu-a12	alpha-Mn · A12 · cI58 · I-43m (217)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1063.24 K, x(Pu) 0.5–0.5	3
ALPU3 phase:al-pu:alpu3	Pb3Sr · tP4 · P4/mmm (123)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 3 of 3 calculated diagram(s): 300–1100 K, x(Pu) 0.75–0.75	3
BCC_A2 phase:al-pu:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 754.9–1320.51 K, x(Pu) 0.84401–1	3
FCC_A1 phase:al-pu:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1060.75 K, x(Pu) 0–1	3
HCP_A3 phase:al-pu:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 3 calculated diagram(s)	3
LIQUID phase:al-pu:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 778–4000 K, x(Pu) 0–1	3
ALPHA_PU phase:al-pu:pu-alpha		needs_review	stable in 3 of 3 calculated diagram(s): 300–397.62 K, x(Pu) 1–1	3
BETA_PU phase:al-pu:pu-beta		needs_review	stable in 3 of 3 calculated diagram(s): 397.62–592.9 K, x(Pu) 1–1	3
GAMMA_PU phase:al-pu:pu-gamma		needs_review	stable in 3 of 3 calculated diagram(s): 487.9–732.9 K, x(Pu) 1–1	3

TETRAGONAL_A6 (Al–Pu)

Id: phase:al-pu: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 3 of 3 calculated diagram(s): 600.31–1320.51 K, x(Pu) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:a6-tetragonal
tdb: tdb:AlPu-04Tur.tdb:TETRAGONAL_A6, tdb:AlPu-10Sed.tdb:TETRAGONAL_A6, tdb:AlPu-16Per.tdb:TETRAGONAL_A6

TDB models of TETRAGONAL_A6 (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: TETRAGONAL_A6, type code %, sha256 e467c364f317d002…

45: PHASE TETRAGONAL_A6 % 1 1 !
46: CONST TETRAGONAL_A6 : AL PU% : !

AlPu-10Sed.tdb: TETRAGONAL_A6, type code %, sha256 52307f110aa139d0…

52: PHASE TETRAGONAL_A6 % 1 1 !
53: CONST TETRAGONAL_A6 : PU : !

AlPu-16Per.tdb: TETRAGONAL_A6, type code %, sha256 782e1c2991439aa8…

50: PHASE TETRAGONAL_A6 % 1 1 !
51: CONST TETRAGONAL_A6 : AL PU% : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

AL2PU_C15 (Al–Pu)

Id: phase:al-pu:al2pu-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaabfrs and oqmd-10568, space group 227
Stoichiometry: Al 0.6667, Pu 0.3333
Stability: stable in 3 of 3 calculated diagram(s): 300–1957.35 K, x(Pu) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:al-pu:al2pu-c15
mp: mp:mp-aaaabfrs
oqmd: oqmd:oqmd-10568
tdb: tdb:AlPu-04Tur.tdb:AL2PU_C15, tdb:AlPu-10Sed.tdb:AL2PU_C15, tdb:AlPu-16Per.tdb:AL2PU_C15

TDB models of AL2PU_C15 (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: AL2PU_C15, type code %, sha256 e467c364f317d002…

90: PHASE AL2PU_C15 % 2 2 1 !
91: CONST AL2PU_C15 : AL : PU : !

AlPu-10Sed.tdb: AL2PU_C15, type code %, sha256 52307f110aa139d0…

92: PHASE AL2PU_C15 % 2 2 1 !
93: CONST AL2PU_C15 : AL : PU : !

AlPu-16Per.tdb: AL2PU_C15, type code %, sha256 782e1c2991439aa8…

95: PHASE AL2PU_C15 % 2 2 1 !
96: CONST AL2PU_C15 : AL : PU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

AL3PU_6H (Al–Pu)

Id: phase:al-pu:al3pu-6h; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:6H; no_structure_token
Candidate (dft_mp): R-3m (166) — on-hull MP PuAl3 at x(PU)=0.2500
Candidate (sgte_mmc2): Al3Pu · hP24 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for AL3PU_6H: Al3Pu-6H (ht2)
Candidate (tdb_comment): Al3Pu · hP24 · P6_3/mmc — AlPu-04Tur.tdb: 'Prototype Al3Pu (hP24, P6_3/mmc), ht2'
Candidate (tdb_comment): Al3Pu · hP24 · P6_3/mmc — AlPu-10Sed.tdb: 'Prototype Al3Pu (hP24, P6_3/mmc), ht2'
Candidate (tdb_comment): Al3Pu · hP24 · P6_3/mmc — AlPu-16Per.tdb: 'Prototype Al3Pu (hP24, P6_3/mmc), ht2'
Stoichiometry: Al 0.7500, Pu 0.2500
Stability: stable in 3 of 3 calculated diagram(s): 1299.99–1500.02 K, x(Pu) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:al3pu-6h
tdb: tdb:AlPu-04Tur.tdb:AL3PU_6H, tdb:AlPu-10Sed.tdb:AL3PU_6H, tdb:AlPu-16Per.tdb:AL3PU_6H

TDB models of AL3PU_6H (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: AL3PU_6H, type code %, sha256 e467c364f317d002…

80: PHASE AL3PU_6H % 2 3 1 !
81: CONST AL3PU_6H : AL : PU : !

AlPu-10Sed.tdb: AL3PU_6H, type code %, sha256 52307f110aa139d0…

82: PHASE AL3PU_6H % 2 3 1 !
83: CONST AL3PU_6H : AL : PU : !

AlPu-16Per.tdb: AL3PU_6H, type code %, sha256 782e1c2991439aa8…

85: PHASE AL3PU_6H % 2 3 1 !
86: CONST AL3PU_6H : AL : PU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

AL3PU_9H (Al–Pu)

Id: phase:al-pu:al3pu-9h; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:9H; no_structure_token
Candidate (dft_mp): R-3m (166) — on-hull MP PuAl3 at x(PU)=0.2500
Candidate (sgte_mmc2): BaPb3 · hR12 · R-3m (166) — Hallstedt 2025 mmc2 row for AL3PU_9H: Al3Pu-9H (rt)
Candidate (tdb_comment): BaPb3 · hR12 · R-3m — AlPu-10Sed.tdb: 'Prototype BaPb3 (hR12, R-3m), rt'
Stoichiometry: Al 0.7500, Pu 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–1299.99 K, x(Pu) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:al-pu:al3pu-9h
tdb: tdb:AlPu-10Sed.tdb:AL3PU_9H

TDB models of AL3PU_9H (1): PHASE and CONSTITUENT statements as written

AlPu-10Sed.tdb: AL3PU_9H, type code %, sha256 52307f110aa139d0…

77: PHASE AL3PU_9H % 2 3 1 !
78: CONST AL3PU_9H : AL : PU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase

AL3PU_9HA (Al–Pu)

Id: phase:al-pu:al3pu-9ha; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:9HA; no_structure_token
Candidate (dft_mp): R-3m (166) — on-hull MP PuAl3 at x(PU)=0.2500
Candidate (sgte_mmc2): BaPb3 · hR12 · R-3m (166) — Hallstedt 2025 mmc2 row for AL3PU_9HA: Al3Pu-9H (rt)
Candidate (tdb_comment): BaPb3 · hR12 · R-3m — AlPu-04Tur.tdb: 'Prototype BaPb3 (hR12, R-3m), rt'
Candidate (tdb_comment): BaPb3 · hR12 · R-3m — AlPu-16Per.tdb: 'Prototype BaPb3 (hR12, R-3m), rt'
Stoichiometry: Al 0.7500, Pu 0.2500
Stability: stable in 2 of 2 calculated diagram(s): 300–1200 K, x(Pu) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-pu:al3pu-9ha
tdb: tdb:AlPu-04Tur.tdb:AL3PU_9HA, tdb:AlPu-16Per.tdb:AL3PU_9HA

TDB models of AL3PU_9HA (2): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: AL3PU_9HA, type code %, sha256 e467c364f317d002…

70: PHASE AL3PU_9HA % 2 3 1 !
71: CONST AL3PU_9HA : AL : PU : !

AlPu-16Per.tdb: AL3PU_9HA, type code %, sha256 782e1c2991439aa8…

75: PHASE AL3PU_9HA % 2 3 1 !
76: CONST AL3PU_9HA : AL : PU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

AL3PU_9HB (Al–Pu)

Id: phase:al-pu:al3pu-9hb; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:9HB; no_structure_token
Candidate (dft_mp): R-3m (166) — on-hull MP PuAl3 at x(PU)=0.2500
Candidate (sgte_mmc2): BaPb3 · hR12 · R-3m (166) — Hallstedt 2025 mmc2 row for AL3PU_9HB: Al3Pu-9H (ht1)
Candidate (tdb_comment): BaPb3 · hR12 · R-3m — AlPu-04Tur.tdb: 'Prototype BaPb3 (hR12, R-3m), ht1'
Candidate (tdb_comment): BaPb3 · hR12 · R-3m — AlPu-16Per.tdb: 'Prototype BaPb3 (hR12, R-3m), ht1'
Stoichiometry: Al 0.7500, Pu 0.2500
Stability: stable in 2 of 2 calculated diagram(s): 1200–1300 K, x(Pu) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:al-pu:al3pu-9hb
tdb: tdb:AlPu-04Tur.tdb:AL3PU_9HB, tdb:AlPu-16Per.tdb:AL3PU_9HB

TDB models of AL3PU_9HB (2): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: AL3PU_9HB, type code %, sha256 e467c364f317d002…

75: PHASE AL3PU_9HB % 2 3 1 !
76: CONST AL3PU_9HB : AL : PU : !

AlPu-16Per.tdb: AL3PU_9HB, type code %, sha256 782e1c2991439aa8…

80: PHASE AL3PU_9HB % 2 3 1 !
81: CONST AL3PU_9HB : AL : PU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

AL3PU_L12 (Al–Pu)

Id: phase:al-pu:al3pu-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Stoichiometry: Al 0.7500, Pu 0.2500
Stability: stable in 3 of 3 calculated diagram(s): 1450–1718.42 K, x(Pu) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:al3pu-l12
tdb: tdb:AlPu-04Tur.tdb:AL3PU_L12, tdb:AlPu-10Sed.tdb:AL3PU_L12, tdb:AlPu-16Per.tdb:AL3PU_L12

TDB models of AL3PU_L12 (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: AL3PU_L12, type code %, sha256 e467c364f317d002…

85: PHASE AL3PU_L12 % 2 3 1 !
86: CONST AL3PU_L12 : AL : PU : !

AlPu-10Sed.tdb: AL3PU_L12, type code %, sha256 52307f110aa139d0…

87: PHASE AL3PU_L12 % 2 3 1 !
88: CONST AL3PU_L12 : AL : PU : !

AlPu-16Per.tdb: AL3PU_L12, type code %, sha256 782e1c2991439aa8…

90: PHASE AL3PU_L12 % 2 3 1 !
91: CONST AL3PU_L12 : AL : PU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

AL4PU_D1B (Al–Pu)

Id: phase:al-pu:al4pu-d1b; status assigned
Structure: Al4U · D1_b · oI20 · Imma (74); type st:d1-b-al4u-oi20; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaabewya and oqmd-10572, space group 74
Stoichiometry: Al 0.8000, Pu 0.2000
Stability: stable in 3 of 3 calculated diagram(s): 300–1222.13 K, x(Pu) 0.2–0.2
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:al-pu:al4pu-d1b
mp: mp:mp-aaabewya
oqmd: oqmd:oqmd-10572
tdb: tdb:AlPu-04Tur.tdb:AL4PU_D1B, tdb:AlPu-10Sed.tdb:AL4PU_D1B, tdb:AlPu-16Per.tdb:AL4PU_D1B

TDB models of AL4PU_D1B (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: AL4PU_D1B, type code %, sha256 e467c364f317d002…

65: PHASE AL4PU_D1B % 2 4 1 !
66: CONST AL4PU_D1B : AL : PU : !

AlPu-10Sed.tdb: AL4PU_D1B, type code %, sha256 52307f110aa139d0…

72: PHASE AL4PU_D1B % 2 4 1 !
73: CONST AL4PU_D1B : AL : PU : !

AlPu-16Per.tdb: AL4PU_D1B, type code %, sha256 782e1c2991439aa8…

70: PHASE AL4PU_D1B % 2 4 1 !
71: CONST AL4PU_D1B : AL : PU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

ALPU_A12 (Al–Pu)

Id: phase:al-pu:alpu-a12; status assigned
Structure: alpha-Mn · A12 · cI58 · I-43m (217); type st:a12-alpha-mn-ci58; tier A: standard phase name; confidence high
Stoichiometry: Al 0.5000, Pu 0.5000
Stability: stable in 3 of 3 calculated diagram(s): 300–1063.24 K, x(Pu) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:alpu-a12
tdb: tdb:AlPu-04Tur.tdb:ALPU_A12, tdb:AlPu-10Sed.tdb:ALPU_A12, tdb:AlPu-16Per.tdb:ALPU_A12

TDB models of ALPU_A12 (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: ALPU_A12, type code %, sha256 e467c364f317d002…

95: PHASE ALPU_A12 % 2 1 1 !
96: CONST ALPU_A12 : AL : PU : !

AlPu-10Sed.tdb: ALPU_A12, type code %, sha256 52307f110aa139d0…

97: PHASE ALPU_A12 % 2 1 1 !
98: CONST ALPU_A12 : AL : PU : !

AlPu-16Per.tdb: ALPU_A12, type code %, sha256 782e1c2991439aa8…

100: PHASE ALPU_A12 % 2 1 1 !
101: CONST ALPU_A12 : AL : PU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

ALPU3 (Al–Pu)

Id: phase:al-pu:alpu3; status assigned
Structure: Pb3Sr · tP4 · P4/mmm (123); type st:pb3sr-tp4; 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 0.2500, Pu 0.7500
Stability: stable in 3 of 3 calculated diagram(s): 300–1100 K, x(Pu) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:alpu3
tdb: tdb:AlPu-04Tur.tdb:ALPU3, tdb:AlPu-10Sed.tdb:ALPU3, tdb:AlPu-16Per.tdb:ALPU3

TDB models of ALPU3 (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: ALPU3, type code %, sha256 e467c364f317d002…

100: PHASE ALPU3 % 2 1 3 !
101: CONST ALPU3 : AL : PU : !

AlPu-10Sed.tdb: ALPU3, type code %, sha256 52307f110aa139d0…

102: PHASE ALPU3 % 2 1 3 !
103: CONST ALPU3 : AL : PU : !

AlPu-16Per.tdb: ALPU3, type code %, sha256 782e1c2991439aa8…

105: PHASE ALPU3 % 2 1 3 !
106: CONST ALPU3 : AL : PU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

BCC_A2 (Al–Pu)

Id: phase:al-pu: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 3 of 3 calculated diagram(s): 754.9–1320.51 K, x(Pu) 0.84401–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:bcc-a2
tdb: tdb:AlPu-04Tur.tdb:BCC_A2, tdb:AlPu-10Sed.tdb:BCC_A2, tdb:AlPu-16Per.tdb:BCC_A2

TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: BCC_A2, type code %B, sha256 e467c364f317d002…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : AL PU% : VA : !

AlPu-10Sed.tdb: BCC_A2, type code %B, sha256 52307f110aa139d0…

42: PHASE BCC_A2 %B 2 1 3 !
43: CONST BCC_A2 : AL PU% : VA : !

AlPu-16Per.tdb: BCC_A2, type code %B, sha256 782e1c2991439aa8…

40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : AL PU% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

FCC_A1 (Al–Pu)

Id: phase:al-pu: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 3 of 3 calculated diagram(s): 300–1060.75 K, x(Pu) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:fcc-a1
tdb: tdb:AlPu-04Tur.tdb:FCC_A1, tdb:AlPu-10Sed.tdb:FCC_A1, tdb:AlPu-16Per.tdb:FCC_A1

TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: FCC_A1, type code %A, sha256 e467c364f317d002…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : AL% PU% : VA : !

AlPu-10Sed.tdb: FCC_A1, type code %A, sha256 52307f110aa139d0…

37: PHASE FCC_A1 %A 2 1 1 !
38: CONST FCC_A1 : AL% ALPU3 PU : VA : !

AlPu-16Per.tdb: FCC_A1, type code %A, sha256 782e1c2991439aa8…

35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : AL% PU% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

HCP_A3 (Al–Pu)

Id: phase:al-pu: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 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:hcp-a3
tdb: tdb:AlPu-04Tur.tdb:HCP_A3, tdb:AlPu-10Sed.tdb:HCP_A3, tdb:AlPu-16Per.tdb:HCP_A3

TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: HCP_A3, type code %A, sha256 e467c364f317d002…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : AL : VA : !

AlPu-10Sed.tdb: HCP_A3, type code %A, sha256 52307f110aa139d0…

47: PHASE HCP_A3 %A 2 1 0.5 !
48: CONST HCP_A3 : AL : VA : !

AlPu-16Per.tdb: HCP_A3, type code %A, sha256 782e1c2991439aa8…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

LIQUID (Al–Pu)

Id: phase:al-pu:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 778–4000 K, x(Pu) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:liquid
tdb: tdb:AlPu-04Tur.tdb:LIQUID, tdb:AlPu-10Sed.tdb:LIQUID, tdb:AlPu-16Per.tdb:LIQUID

TDB models of LIQUID (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: LIQUID, type code %, sha256 e467c364f317d002…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : AL PU : !

AlPu-10Sed.tdb: LIQUID, type code %, sha256 52307f110aa139d0…

32: PHASE LIQUID:L % 1 1 !
33: CONST LIQUID:L : AL AL2PU PU : !

AlPu-16Per.tdb: LIQUID, type code %, sha256 782e1c2991439aa8…

30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : AL PU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

ALPHA_PU (Al–Pu)

Id: phase:al-pu:pu-alpha; status needs_review
No structure assigned. Why: no_structure_token; off_stoichiometric_model
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 — AlPu-04Tur.tdb: 'Prototype alpha-Pu (mP16, P2_1/m)'
Candidate (tdb_comment): alpha-Pu · mP16 · P2_1/m — AlPu-10Sed.tdb: 'Prototype alpha-Pu (mP16, P2_1/m)'
Candidate (tdb_comment): alpha-Pu · mP16 · P2_1/m — AlPu-16Per.tdb: 'Prototype alpha-Pu (mP16, P2_1/m)'
Stability: stable in 3 of 3 calculated diagram(s): 300–397.62 K, x(Pu) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:pu-alpha
tdb: tdb:AlPu-04Tur.tdb:ALPHA_PU, tdb:AlPu-10Sed.tdb:ALPHA_PU, tdb:AlPu-16Per.tdb:ALPHA_PU

TDB models of ALPHA_PU (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: ALPHA_PU, type code %, sha256 e467c364f317d002…

50: PHASE ALPHA_PU % 1 1 !
51: CONST ALPHA_PU : AL PU% : !

AlPu-10Sed.tdb: ALPHA_PU, type code %, sha256 52307f110aa139d0…

57: PHASE ALPHA_PU % 1 1 !
58: CONST ALPHA_PU : PU : !

AlPu-16Per.tdb: ALPHA_PU, type code %, sha256 782e1c2991439aa8…

55: PHASE ALPHA_PU % 1 1 !
56: CONST ALPHA_PU : AL PU% : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

BETA_PU (Al–Pu)

Id: phase:al-pu: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 — AlPu-04Tur.tdb: 'Prototype beta-Pu (mC34, C2/m)'
Candidate (tdb_comment): beta-Pu · mC34 · C2/m — AlPu-10Sed.tdb: 'Prototype beta-Pu (mC34, C2/m)'
Candidate (tdb_comment): beta-Pu · mC34 · C2/m — AlPu-16Per.tdb: 'Prototype beta-Pu (mC34, C2/m)'
Stoichiometry: Pu 1.0000
Stability: stable in 3 of 3 calculated diagram(s): 397.62–592.9 K, x(Pu) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:pu-beta
tdb: tdb:AlPu-04Tur.tdb:BETA_PU, tdb:AlPu-10Sed.tdb:BETA_PU, tdb:AlPu-16Per.tdb:BETA_PU

TDB models of BETA_PU (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: BETA_PU, type code %, sha256 e467c364f317d002…

55: PHASE BETA_PU % 1 1 !
56: CONST BETA_PU : PU : !

AlPu-10Sed.tdb: BETA_PU, type code %, sha256 52307f110aa139d0…

62: PHASE BETA_PU % 1 1 !
63: CONST BETA_PU : PU : !

AlPu-16Per.tdb: BETA_PU, type code %, sha256 782e1c2991439aa8…

60: PHASE BETA_PU % 1 1 !
61: CONST BETA_PU : PU : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
assessment that models this phase

GAMMA_PU (Al–Pu)

Id: phase:al-pu:pu-gamma; status needs_review
No structure assigned. Why: no_structure_token; off_stoichiometric_model
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 — AlPu-04Tur.tdb: 'Prototype gamma-Pu (oF8, Fddd)'
Candidate (tdb_comment): gamma-Pu · oF8 · Fddd — AlPu-10Sed.tdb: 'Prototype gamma-Pu (oF8, Fddd)'
Candidate (tdb_comment): gamma-Pu · oF8 · Fddd — AlPu-16Per.tdb: 'Prototype gamma-Pu (oF8, Fddd)'
Stability: stable in 3 of 3 calculated diagram(s): 487.9–732.9 K, x(Pu) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:al-pu:pu-gamma
tdb: tdb:AlPu-04Tur.tdb:GAMMA_PU, tdb:AlPu-10Sed.tdb:GAMMA_PU, tdb:AlPu-16Per.tdb:GAMMA_PU

TDB models of GAMMA_PU (3): PHASE and CONSTITUENT statements as written

AlPu-04Tur.tdb: GAMMA_PU, type code %, sha256 e467c364f317d002…

60: PHASE GAMMA_PU % 1 1 !
61: CONST GAMMA_PU : AL PU% : !

AlPu-10Sed.tdb: GAMMA_PU, type code %, sha256 52307f110aa139d0…

67: PHASE GAMMA_PU % 1 1 !
68: CONST GAMMA_PU : PU : !

AlPu-16Per.tdb: GAMMA_PU, type code %, sha256 782e1c2991439aa8…

65: PHASE GAMMA_PU % 1 1 !
66: CONST GAMMA_PU : AL PU% : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jnucmat.2009.11.023 D. Sedmidubský, R.J.M. Konings, P. Souček, Ab-initio calculations and phase diagram assessments of An–Al systems (An= U, Np, Pu), Journal of Nuclear Materials 397, 1-7 (2010).
assessment that models this phase
doi:10.1016/j.jnucmat.2016.09.012 A. Perron, P.E.A. Turchi, A. Landa, B. Oudot, B. Ravat, F. Delaunay, Thermodynamic assessments and inter-relationships between systems involving Al, Am, Ga, Pu, and U, Journal of Nuclear Materials 482, 187-200 (2016).
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}
}