Si–U phases

15 phases (tier A 9, liquid 1, needs_review 5); 13 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 · Si–U system page · Markdown · field reference

Phases of the Si–U system (15)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
ORTHORHOMBIC_A20 phase:si-u:a20-orthorhombic	alpha-U · A20 · oC4 · Cmcm (63)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1047.02 K, x(U) 0.99678–1	0	3
DIAMOND_A4 phase:si-u:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1692.32 K, x(U) 0–0	0	3
BCC_A2 phase:si-u:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 1048.99–3999.24 K, x(U) 0.97214–1	0	3
FCC_A1 phase:si-u:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
HCP_A3 phase:si-u:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
LIQUID phase:si-u:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 1249.45–4000 K, x(U) 0–1	5	3
SI2U_CC phase:si-u:si2u-cc		needs_review	stable in 3 of 3 calculated diagram(s): 300–1995.22 K, x(U) 0.33333–0.34722	0	3
SI2U3_D5A phase:si-u:si2u3-d5a	Si2U3 · D5_a · tP10 · P4/mbm (127)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1952.23 K, x(U) 0.6–0.6	0	3
SI3U_L12 phase:si-u:si3u-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1795.75 K, x(U) 0.25–0.25	0	3
SI5U3_C32 phase:si-u:si5u3-c32		needs_review	stable in 3 of 3 calculated diagram(s): 300–2040.44 K, x(U) 0.375–0.375	0	3
SIU_B27 phase:si-u:siu-b27		needs_review	stable in 3 of 3 calculated diagram(s): 300–1871.05 K, x(U) 0.489–0.5	0	3
SIU3 phase:si-u:siu3		needs_review	stable in 2 of 2 calculated diagram(s): 300–1205.16 K, x(U) 0.75–0.75	0	2
SIU3_D0C phase:si-u:siu3-d0c	SiU3-lt · D0_c · tI16 · I4/mcm (140)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1260 K, x(U) 0.75–0.75	0	1
SIU3_L12 phase:si-u:siu3-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1037.98–1200 K, x(U) 0.75–0.75	0	1
TETRAGONAL_U phase:si-u:u-tetragonal		needs_review	stable in 3 of 3 calculated diagram(s): 920.82–1057.52 K, x(U) 0.98734–1	0	3

ORTHORHOMBIC_A20 (Si–U)

Id: phase:si-u:a20-orthorhombic; status assigned
Structure: alpha-U · A20 · oC4 · Cmcm (63); type st:a20-alpha-u-oc4; tier A: standard phase name; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 300–1047.02 K, x(U) 0.99678–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:si-u:a20-orthorhombic
tdb: tdb:SiU-04Che-LB.tdb:ORTHORHOMBIC_A20, tdb:SiU-09Ber.tdb:ORTHORHOMBIC_A20, tdb:SiU-98AEA.tdb:ORTHORHOMBIC_A20

TDB models of ORTHORHOMBIC_A20 (3): PHASE and CONSTITUENT statements as written

SiU-04Che-LB.tdb: ORTHORHOMBIC_A20, type code %, sha256 84486566b19cb138…

53: PHASE ORTHORHOMBIC_A20 % 1 1 !
54: CONST ORTHORHOMBIC_A20 : SI U% : !

SiU-09Ber.tdb: ORTHORHOMBIC_A20, type code %, sha256 145f0a0d4b59bca1…

47: PHASE ORTHORHOMBIC_A20 % 1 1 !
48: CONST ORTHORHOMBIC_A20 : U : !

SiU-98AEA.tdb: ORTHORHOMBIC_A20, type code %, sha256 ad20359bfb8262bf…

54: PHASE ORTHORHOMBIC_A20 % 1 1 !
55: CONST ORTHORHOMBIC_A20 : U : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

DIAMOND_A4 (Si–U)

Id: phase:si-u:a4-diamond; status assigned
Structure: C (diamond) · A4 · cF8 · Fd-3m (227); type st:a4-c-diamond-cf8; tier A: standard phase name; confidence high
Stoichiometry: Si 1.0000
Stability: stable in 3 of 3 calculated diagram(s): 300–1692.32 K, x(U) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:si-u:a4-diamond
tdb: tdb:SiU-04Che-LB.tdb:DIAMOND_A4, tdb:SiU-09Ber.tdb:DIAMOND_A4, tdb:SiU-98AEA.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (3): PHASE and CONSTITUENT statements as written

SiU-04Che-LB.tdb: DIAMOND_A4, type code %, sha256 84486566b19cb138…

48: PHASE DIAMOND_A4 % 1 1 !
49: CONST DIAMOND_A4 : SI : !

SiU-09Ber.tdb: DIAMOND_A4, type code %, sha256 145f0a0d4b59bca1…

42: PHASE DIAMOND_A4 % 1 1 !
43: CONST DIAMOND_A4 : SI : !

SiU-98AEA.tdb: DIAMOND_A4, type code %, sha256 ad20359bfb8262bf…

49: PHASE DIAMOND_A4 % 1 1 !
50: CONST DIAMOND_A4 : SI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

BCC_A2 (Si–U)

Id: phase:si-u: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): 1048.99–3999.24 K, x(U) 0.97214–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:si-u:bcc-a2
tdb: tdb:SiU-04Che-LB.tdb:BCC_A2, tdb:SiU-09Ber.tdb:BCC_A2, tdb:SiU-98AEA.tdb:BCC_A2

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

SiU-04Che-LB.tdb: BCC_A2, type code %B, sha256 84486566b19cb138…

38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : SI U% : VA : !

SiU-09Ber.tdb: BCC_A2, type code %B, sha256 145f0a0d4b59bca1…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : SI U% : VA : !

SiU-98AEA.tdb: BCC_A2, type code %B, sha256 ad20359bfb8262bf…

39: PHASE BCC_A2 %B 2 1 3 !
40: CONST BCC_A2 : U : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

FCC_A1 (Si–U)

Id: phase:si-u:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
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:si-u:fcc-a1
tdb: tdb:SiU-04Che-LB.tdb:FCC_A1, tdb:SiU-09Ber.tdb:FCC_A1, tdb:SiU-98AEA.tdb:FCC_A1

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

SiU-04Che-LB.tdb: FCC_A1, type code %A, sha256 84486566b19cb138…

33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : SI U : VA : !

SiU-09Ber.tdb: FCC_A1, type code %A, sha256 145f0a0d4b59bca1…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : SI U : VA : !

SiU-98AEA.tdb: FCC_A1, type code %A, sha256 ad20359bfb8262bf…

34: PHASE FCC_A1 %A 2 1 1 !
35: CONST FCC_A1 : SI U : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

HCP_A3 (Si–U)

Id: phase:si-u:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
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:si-u:hcp-a3
tdb: tdb:SiU-04Che-LB.tdb:HCP_A3, tdb:SiU-09Ber.tdb:HCP_A3, tdb:SiU-98AEA.tdb:HCP_A3

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

SiU-04Che-LB.tdb: HCP_A3, type code %A, sha256 84486566b19cb138…

43: PHASE HCP_A3 %A 2 1 0.5 !
44: CONST HCP_A3 : SI U : VA : !

SiU-09Ber.tdb: HCP_A3, type code %A, sha256 145f0a0d4b59bca1…

37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : SI U : VA : !

SiU-98AEA.tdb: HCP_A3, type code %A, sha256 ad20359bfb8262bf…

44: PHASE HCP_A3 %A 2 1 0.5 !
45: CONST HCP_A3 : SI U : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

LIQUID (Si–U)

Id: phase:si-u:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 1249.45–4000 K, x(U) 0–1
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:si-u:liquid
paper: paper:10.1016/j.jnucmat.2009.01.014:liquid
tdb: tdb:SiU-04Che-LB.tdb:LIQUID, tdb:SiU-09Ber.tdb:LIQUID, tdb:SiU-98AEA.tdb:LIQUID

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

SiU-04Che-LB.tdb: LIQUID, type code %, sha256 84486566b19cb138…

28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : SI U : !

SiU-09Ber.tdb: LIQUID, type code %, sha256 145f0a0d4b59bca1…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : SI U : !

SiU-98AEA.tdb: LIQUID, type code %, sha256 ad20359bfb8262bf…

29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : SI U : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase; reports values for this phase

SI2U_CC (Si–U)

Id: phase:si-u:si2u-cc; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:models_disagree_on_composition; models_disagree_on_composition; stoichiometry_contradicts_C_c:SiU-04Che-LB.tdb; stoichiometry_contradicts_C_c:SiU-09Ber.tdb
Candidate (name_token): Si2Th · C_c · tI12 · I4_1/amd (141) — Strukturbericht/word 'CC' in the TDB name
Candidate (sgte_mmc2): Si2Th · C_c · tI12 · I4_1/amd (141) — Hallstedt 2025 mmc2 row for SI2U_CC: Si2U
Candidate (tdb_comment): Si2Th · tI12 · I4_1/amd — SiU-04Che-LB.tdb: 'Prototype Si2Th (tI12, I4_1/amd)'
Candidate (tdb_comment): Si2Th · tI12 · I4_1/amd — SiU-09Ber.tdb: 'Prototype Si2Th (tI12, I4_1/amd)'
Candidate (tdb_comment): Si2Th · tI12 · I4_1/amd — SiU-98AEA.tdb: 'Prototype Si2Th (tI12, I4_1/amd)'
Stability: stable in 3 of 3 calculated diagram(s): 300–1995.22 K, x(U) 0.33333–0.34722
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:si-u:si2u-cc
tdb: tdb:SiU-04Che-LB.tdb:SI2U_CC, tdb:SiU-09Ber.tdb:SI2U_CC, tdb:SiU-98AEA.tdb:SI2U_CC

TDB models of SI2U_CC (3): PHASE and CONSTITUENT statements as written

SiU-04Che-LB.tdb: SI2U_CC, type code %, sha256 84486566b19cb138…

68: PHASE SI2U_CC % 2 47 25 !
69: CONST SI2U_CC : SI : U : !

SiU-09Ber.tdb: SI2U_CC, type code %, sha256 145f0a0d4b59bca1…

62: PHASE SI2U_CC % 2 1.88 1 !
63: CONST SI2U_CC : SI : U : !

SiU-98AEA.tdb: SI2U_CC, type code %, sha256 ad20359bfb8262bf…

69: PHASE SI2U_CC % 2 2 1 !
70: CONST SI2U_CC : SI : U : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

SI2U3_D5A (Si–U)

Id: phase:si-u:si2u3-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: Si 0.4000, U 0.6000
Stability: stable in 3 of 3 calculated diagram(s): 300–1952.23 K, x(U) 0.6–0.6
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:si-u:si2u3-d5a
tdb: tdb:SiU-04Che-LB.tdb:SI2U3_D5A, tdb:SiU-09Ber.tdb:SI2U3_D5A, tdb:SiU-98AEA.tdb:SI2U3_D5A

TDB models of SI2U3_D5A (3): PHASE and CONSTITUENT statements as written

SiU-04Che-LB.tdb: SI2U3_D5A, type code %, sha256 84486566b19cb138…

83: PHASE SI2U3_D5A % 2 2 3 !
84: CONST SI2U3_D5A : SI : U : !

SiU-09Ber.tdb: SI2U3_D5A, type code %, sha256 145f0a0d4b59bca1…

77: PHASE SI2U3_D5A % 2 2 3 !
78: CONST SI2U3_D5A : SI : U : !

SiU-98AEA.tdb: SI2U3_D5A, type code %, sha256 ad20359bfb8262bf…

84: PHASE SI2U3_D5A % 2 2 3 !
85: CONST SI2U3_D5A : SI : U : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

SI3U_L12 (Si–U)

Id: phase:si-u:si3u-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaeds and oqmd-18109, space group 221
Stoichiometry: Si 0.7500, U 0.2500
Stability: stable in 3 of 3 calculated diagram(s): 300–1795.75 K, x(U) 0.25–0.25
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:si-u:si3u-l12
mp: mp:mp-aaaaaeds
oqmd: oqmd:oqmd-18109
tdb: tdb:SiU-04Che-LB.tdb:SI3U_L12, tdb:SiU-09Ber.tdb:SI3U_L12, tdb:SiU-98AEA.tdb:SI3U_L12

TDB models of SI3U_L12 (3): PHASE and CONSTITUENT statements as written

SiU-04Che-LB.tdb: SI3U_L12, type code %, sha256 84486566b19cb138…

63: PHASE SI3U_L12 % 2 3 1 !
64: CONST SI3U_L12 : SI : U : !

SiU-09Ber.tdb: SI3U_L12, type code %, sha256 145f0a0d4b59bca1…

57: PHASE SI3U_L12 % 2 3 1 !
58: CONST SI3U_L12 : SI : U : !

SiU-98AEA.tdb: SI3U_L12, type code %, sha256 ad20359bfb8262bf…

64: PHASE SI3U_L12 % 2 3 1 !
65: CONST SI3U_L12 : SI : U : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

SI5U3_C32 (Si–U)

Id: phase:si-u:si5u3-c32; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_C32; stoichiometry_contradicts_C32:SiU-04Che-LB.tdb; stoichiometry_contradicts_C32:SiU-09Ber.tdb; stoichiometry_contradicts_C32:SiU-98AEA.tdb
Candidate (name_token): AlB2 · C32 · hP3 · P6/mmm (191) — Strukturbericht/word 'C32' in the TDB name
Candidate (sgte_mmc2): AlB2 · C32 · hP3 · P6/mmm (191) — Hallstedt 2025 mmc2 row for SI5U3_C32: Si5U3
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — SiU-04Che-LB.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — SiU-09Ber.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — SiU-98AEA.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
Stoichiometry: Si 0.6250, U 0.3750
Stability: stable in 3 of 3 calculated diagram(s): 300–2040.44 K, x(U) 0.375–0.375
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:si-u:si5u3-c32
tdb: tdb:SiU-04Che-LB.tdb:SI5U3_C32, tdb:SiU-09Ber.tdb:SI5U3_C32, tdb:SiU-98AEA.tdb:SI5U3_C32

TDB models of SI5U3_C32 (3): PHASE and CONSTITUENT statements as written

SiU-04Che-LB.tdb: SI5U3_C32, type code %, sha256 84486566b19cb138…

73: PHASE SI5U3_C32 % 2 5 3 !
74: CONST SI5U3_C32 : SI : U : !

SiU-09Ber.tdb: SI5U3_C32, type code %, sha256 145f0a0d4b59bca1…

67: PHASE SI5U3_C32 % 2 5 3 !
68: CONST SI5U3_C32 : SI : U : !

SiU-98AEA.tdb: SI5U3_C32, type code %, sha256 ad20359bfb8262bf…

74: PHASE SI5U3_C32 % 2 5 3 !
75: CONST SI5U3_C32 : SI : U : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

SIU_B27 (Si–U)

Id: phase:si-u:siu-b27; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:models_disagree_on_composition; models_disagree_on_composition; stoichiometry_contradicts_B27:SiU-04Che-LB.tdb; stoichiometry_contradicts_B27:SiU-09Ber.tdb
Candidate (name_token): FeB · B27 · oP8 · Pnma (62) — Strukturbericht/word 'B27' in the TDB name
Candidate (sgte_mmc2): FeB · B27 · oP8 · Pnma (62) — Hallstedt 2025 mmc2 row for SIU_B27: SiU
Candidate (tdb_comment): FeB · oP8 · Pnma — SiU-04Che-LB.tdb: 'Prototype FeB (oP8, Pnma)'
Candidate (tdb_comment): FeB · oP8 · Pnma — SiU-09Ber.tdb: 'Prototype FeB (oP8, Pnma)'
Candidate (tdb_comment): FeB · oP8 · Pnma — SiU-98AEA.tdb: 'Prototype FeB (oP8, Pnma)'
Stability: stable in 3 of 3 calculated diagram(s): 300–1871.05 K, x(U) 0.489–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:si-u:siu-b27
tdb: tdb:SiU-04Che-LB.tdb:SIU_B27, tdb:SiU-09Ber.tdb:SIU_B27, tdb:SiU-98AEA.tdb:SIU_B27

TDB models of SIU_B27 (3): PHASE and CONSTITUENT statements as written

SiU-04Che-LB.tdb: SIU_B27, type code %, sha256 84486566b19cb138…

78: PHASE SIU_B27 % 2 0.511 0.489 !
79: CONST SIU_B27 : SI : U : !

SiU-09Ber.tdb: SIU_B27, type code %, sha256 145f0a0d4b59bca1…

72: PHASE SIU_B27 % 2 3.45 3.4 !
73: CONST SIU_B27 : SI : U : !

SiU-98AEA.tdb: SIU_B27, type code %, sha256 ad20359bfb8262bf…

79: PHASE SIU_B27 % 2 1 1 !
80: CONST SIU_B27 : SI : U : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

SIU3 (Si–U)

Id: phase:si-u:siu3; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
Candidate (dft_mp): I4/mcm (140) — on-hull MP U3Si at x(U)=0.7500
Candidate (dft_oqmd): I4/mcm (140) — on-hull OQMD Si1 U3 at x(U)=0.7500
Candidate (tdb_comment): SiU3 · tI16 · I4/mcm — SiU-09Ber.tdb: 'Prototype SiU3 (tI16, I4/mcm), low T'
Candidate (tdb_comment): SiU3 · tI16 · I4/mcm, D0_c — SiU-98AEA.tdb: 'Prototype SiU3 (tI16, I4/mcm, D0_c), low T'
Stoichiometry: Si 0.2500, U 0.7500
Stability: stable in 2 of 2 calculated diagram(s): 300–1205.16 K, x(U) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:si-u:siu3
tdb: tdb:SiU-09Ber.tdb:SIU3, tdb:SiU-98AEA.tdb:SIU3

TDB models of SIU3 (2): PHASE and CONSTITUENT statements as written

SiU-09Ber.tdb: SIU3, type code %, sha256 145f0a0d4b59bca1…

83: PHASE SIU3 % 2 1 3 !
84: CONST SIU3 : SI : U : !

SiU-98AEA.tdb: SIU3, type code %, sha256 ad20359bfb8262bf…

90: PHASE SIU3 % 2 1 3 !
91: CONST SIU3 : SI : U : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
assessment that models this phase

SIU3_D0C (Si–U)

Id: phase:si-u:siu3-d0c; status assigned
Structure: SiU3-lt · D0_c · tI16 · I4/mcm (140); type st:d0-c-siu3-lt-ti16; tier A: standard phase name; confidence high
Stoichiometry: Si 0.2500, U 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–1260 K, x(U) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:si-u:siu3-d0c
tdb: tdb:SiU-04Che-LB.tdb:SIU3_D0C

TDB models of SIU3_D0C (1): PHASE and CONSTITUENT statements as written

SiU-04Che-LB.tdb: SIU3_D0C, type code %, sha256 84486566b19cb138…

88: PHASE SIU3_D0C % 2 1 3 !
89: CONST SIU3_D0C : SI : U : !

SIU3_L12 (Si–U)

Id: phase:si-u:siu3-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: Si 0.2500, U 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 1037.98–1200 K, x(U) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:si-u:siu3-l12
tdb: tdb:SiU-04Che-LB.tdb:SIU3_L12

TDB models of SIU3_L12 (1): PHASE and CONSTITUENT statements as written

SiU-04Che-LB.tdb: SIU3_L12, type code %, sha256 84486566b19cb138…

93: PHASE SIU3_L12 % 2 1 3 !
94: CONST SIU3_L12 : SI : U : !

TETRAGONAL_U (Si–U)

Id: phase:si-u:u-tetragonal; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:TETRAGONAL; no_structure_token
Candidate (sgte_mmc2): beta-U · A_b · tP30 · P4_2/mnm (136) — Hallstedt 2025 mmc2 row for TETRAGONAL_U: beta-U
Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — SiU-04Che-LB.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — SiU-09Ber.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — SiU-98AEA.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Stability: stable in 3 of 3 calculated diagram(s): 920.82–1057.52 K, x(U) 0.98734–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:si-u:u-tetragonal
tdb: tdb:SiU-04Che-LB.tdb:TETRAGONAL_U, tdb:SiU-09Ber.tdb:TETRAGONAL_U, tdb:SiU-98AEA.tdb:TETRAGONAL_U

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

SiU-04Che-LB.tdb: TETRAGONAL_U, type code %, sha256 84486566b19cb138…

58: PHASE TETRAGONAL_U % 1 1 !
59: CONST TETRAGONAL_U : SI U% : !

SiU-09Ber.tdb: TETRAGONAL_U, type code %, sha256 145f0a0d4b59bca1…

52: PHASE TETRAGONAL_U % 1 1 !
53: CONST TETRAGONAL_U : SI U% : !

SiU-98AEA.tdb: TETRAGONAL_U, type code %, sha256 ad20359bfb8262bf…

59: PHASE TETRAGONAL_U % 1 1 !
60: CONST TETRAGONAL_U : U : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jnucmat.2009.01.014 A. Berche, C. Rado, O. Rapaud, C. Guéneau, J. Rogez, Thermodynamic study of the U–Si system, Journal of Nuclear Materials 389, 101-107 (2009).
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}
}