Sn–U phases

15 phases (tier A 7, tier C 6, liquid 1, needs_review 1); 12 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 · Sn–U system page · Markdown · field reference

Phases of the Sn–U system (15)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
ORTHORHOMBIC_A20 phase:sn-u:a20-orthorhombic	alpha-U · A20 · oC4 · Cmcm (63)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–942.02 K, x(U) 1–1	3	2
DIAMOND_A4 phase:sn-u:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
BCT_A5 phase:sn-u:a5-bct	beta-Sn · A5 · tI4 · I4_1/amd (141)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–505.08 K, x(U) 0–0	4	2
BCC_A2 phase:sn-u:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1047.33–3999.84 K, x(U) 0.98014–1	8	2
FCC_A1 phase:sn-u:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
HCP_A3 phase:sn-u:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
LIQUID phase:sn-u:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 505.08–4000 K, x(U) 0–1	30	2
SN2U phase:sn-u:sn2u	Ga2Zr · oC12 · Cmmm (65)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1627.22 K, x(U) 0.33333–0.33333	6	1
SN2U3 phase:sn-u:sn2u3	Ga4Ti5 · hP18 · P6_3/mcm (193)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1695.57 K, x(U) 0.6–0.6	6	1
SN3U_L12 phase:sn-u:sn3u-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1604.74 K, x(U) 0.25–0.25	10	2
SN4U5 phase:sn-u:sn4u5	Ga4Ti5 · hP18 · P6_3/mcm (193)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1664.19 K, x(U) 0.55556–0.55556	15	1
SN5U3 phase:sn-u:sn5u3	Ga2Zr · oC12 · Cmmm (65)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1619.62 K, x(U) 0.375–0.375	4	1
SN7U3 phase:sn-u:sn7u3	Ce3Sn7 · oC20 · Cmmm (65)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1615.46 K, x(U) 0.3–0.3	6	1
SNU phase:sn-u:snu	InTh · oP24 · Pbcm (57)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1661.44 K, x(U) 0.5–0.5	6	1
TETRAGONAL_U phase:sn-u:u-tetragonal		needs_review	stable in 2 of 2 calculated diagram(s): 942.02–1403.83 K, x(U) 0.99999–1	6	2

ORTHORHOMBIC_A20 (Sn–U)

Id: phase:sn-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 2 of 2 calculated diagram(s): 300–942.02 K, x(U) 1–1
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:sn-u:a20-orthorhombic, corpus:phase:sn-u:orthorhombic-a20
paper: paper:10.1007/s11669-021-00872-2:Orthorhombic_U
tdb: tdb:SnU-21Wan.tdb:ORTHORHOMBIC_A20, tdb:SnU-87She.tdb:ORTHORHOMBIC_A20

TDB models of ORTHORHOMBIC_A20 (2): PHASE and CONSTITUENT statements as written

SnU-21Wan.tdb: ORTHORHOMBIC_A20, type code %, sha256 bfb5a924fae70c95…

63: PHASE ORTHORHOMBIC_A20 % 1 1 !
64: CONST ORTHORHOMBIC_A20 : SN U% : !

SnU-87She.tdb: ORTHORHOMBIC_A20, type code %, sha256 52159592cd32f1c5…

56: PHASE ORTHORHOMBIC_A20 % 1 1 !
57: CONST ORTHORHOMBIC_A20 : U : !

Example references (4 of 4; assessments first):

doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase
doi:10.1016/0925-8388(94)01463-9 A. Palenzona, P. Manfrinetti, The phase diagram of the USn system, Journal of Alloys and Compounds 221, 157-160 (1995).
cited as the source of values for this phase
doi:10.1016/j.jct.2015.08.029 J. Wang, K. Wang, C.H. Ma, and L.D. Xie, J. Wang, K. Wang, C.H. Ma, and L.D. Xie, Critical Evaluation and Thermodynamic Optimization of the (U ? Bi), (U ? Si) and (U ? Sn) Binary Systems, J. Chem. Thermodyn., 2016, 92, p 158–167
cited as the source of values for this phase

DIAMOND_A4 (Sn–U)

Id: phase:sn-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: Sn 1.0000
Stability: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:sn-u:a4-diamond, corpus:phase:sn-u:diamond-a4
tdb: tdb:SnU-21Wan.tdb:DIAMOND_A4, tdb:SnU-87She.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (2): PHASE and CONSTITUENT statements as written

SnU-21Wan.tdb: DIAMOND_A4, type code %, sha256 bfb5a924fae70c95…

53: PHASE DIAMOND_A4 % 1 1 !
54: CONST DIAMOND_A4 : SN : !

SnU-87She.tdb: DIAMOND_A4, type code %, sha256 52159592cd32f1c5…

46: PHASE DIAMOND_A4 % 1 1 !
47: CONST DIAMOND_A4 : SN : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase
doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase

BCT_A5 (Sn–U)

Id: phase:sn-u:a5-bct; status assigned
Structure: beta-Sn · A5 · tI4 · I4_1/amd (141); type st:a5-beta-sn-ti4; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–505.08 K, x(U) 0–0
Literature: 4 values (4 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:sn-u:a5-bct, corpus:phase:sn-u:bct-a5
paper: paper:10.1007/bf02869271:βSn, paper:10.1007/s11669-021-00872-2:bct_Sn
tdb: tdb:SnU-21Wan.tdb:BCT_A5, tdb:SnU-87She.tdb:BCT_A5

TDB models of BCT_A5 (2): PHASE and CONSTITUENT statements as written

SnU-21Wan.tdb: BCT_A5, type code %, sha256 bfb5a924fae70c95…

58: PHASE BCT_A5 % 1 1 !
59: CONST BCT_A5 : SN% U : !

SnU-87She.tdb: BCT_A5, type code %, sha256 52159592cd32f1c5…

51: PHASE BCT_A5 % 1 1 !
52: CONST BCT_A5 : SN : !

Example references (4 of 4; assessments first):

doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01463-9 A. Palenzona, P. Manfrinetti, The phase diagram of the USn system, Journal of Alloys and Compounds 221, 157-160 (1995).
cited as the source of values for this phase
doi:10.1016/j.jct.2015.08.029 J. Wang, K. Wang, C.H. Ma, and L.D. Xie, J. Wang, K. Wang, C.H. Ma, and L.D. Xie, Critical Evaluation and Thermodynamic Optimization of the (U ? Bi), (U ? Si) and (U ? Sn) Binary Systems, J. Chem. Thermodyn., 2016, 92, p 158–167
cited as the source of values for this phase

BCC_A2 (Sn–U)

Id: phase:sn-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 2 of 2 calculated diagram(s): 1047.33–3999.84 K, x(U) 0.98014–1
Literature: 8 values (8 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:sn-u:bcc-a2
paper: paper:10.1007/bf02869271:γU, paper:10.1007/s11669-021-00872-2:bcc_A2, paper:10.1007/s11669-021-00872-2:bcc_U
tdb: tdb:SnU-21Wan.tdb:BCC_A2, tdb:SnU-87She.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

SnU-21Wan.tdb: BCC_A2, type code %B, sha256 bfb5a924fae70c95…

43: PHASE BCC_A2 %B 2 1 3 !
44: CONST BCC_A2 : SN U% : VA : !

SnU-87She.tdb: BCC_A2, type code %B, sha256 52159592cd32f1c5…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : SN U% : VA : !

Example references (4 of 4; assessments first):

doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01463-9 A. Palenzona, P. Manfrinetti, The phase diagram of the USn system, Journal of Alloys and Compounds 221, 157-160 (1995).
cited as the source of values for this phase
doi:10.1016/j.jct.2015.08.029 J. Wang, K. Wang, C.H. Ma, and L.D. Xie, J. Wang, K. Wang, C.H. Ma, and L.D. Xie, Critical Evaluation and Thermodynamic Optimization of the (U ? Bi), (U ? Si) and (U ? Sn) Binary Systems, J. Chem. Thermodyn., 2016, 92, p 158–167
cited as the source of values for this phase

FCC_A1 (Sn–U)

Id: phase:sn-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 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:sn-u:fcc-a1
tdb: tdb:SnU-21Wan.tdb:FCC_A1, tdb:SnU-87She.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

SnU-21Wan.tdb: FCC_A1, type code %A, sha256 bfb5a924fae70c95…

38: PHASE FCC_A1 %A 2 1 1 !
39: CONST FCC_A1 : SN U : VA : !

SnU-87She.tdb: FCC_A1, type code %A, sha256 52159592cd32f1c5…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : SN U : VA : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase
doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase

HCP_A3 (Sn–U)

Id: phase:sn-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 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:sn-u:hcp-a3
tdb: tdb:SnU-21Wan.tdb:HCP_A3, tdb:SnU-87She.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

SnU-21Wan.tdb: HCP_A3, type code %A, sha256 bfb5a924fae70c95…

48: PHASE HCP_A3 %A 2 1 0.5 !
49: CONST HCP_A3 : SN U : VA: !

SnU-87She.tdb: HCP_A3, type code %A, sha256 52159592cd32f1c5…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : SN U : VA: !

Example references (2 of 2; assessments first):

doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase
doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase

LIQUID (Sn–U)

Id: phase:sn-u:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 505.08–4000 K, x(U) 0–1
Literature: 30 values (30 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:sn-u:liquid
paper: paper:10.1007/bf02869271:L, paper:10.1007/s11669-021-00872-2:Liquid
tdb: tdb:SnU-21Wan.tdb:LIQUID, tdb:SnU-87She.tdb:LIQUID

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

SnU-21Wan.tdb: LIQUID, type code %, sha256 bfb5a924fae70c95…

33: PHASE LIQUID:L % 1 1 !
34: CONST LIQUID:L : SN U : !

SnU-87She.tdb: LIQUID, type code %, sha256 52159592cd32f1c5…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : SN U : !

Example references (4 of 4; assessments first):

doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01463-9 A. Palenzona, P. Manfrinetti, The phase diagram of the USn system, Journal of Alloys and Compounds 221, 157-160 (1995).
cited as the source of values for this phase
doi:10.1016/j.jct.2015.08.029 J. Wang, K. Wang, C.H. Ma, and L.D. Xie, J. Wang, K. Wang, C.H. Ma, and L.D. Xie, Critical Evaluation and Thermodynamic Optimization of the (U ? Bi), (U ? Si) and (U ? Sn) Binary Systems, J. Chem. Thermodyn., 2016, 92, p 158–167
cited as the source of values for this phase

SN2U (Sn–U)

Id: phase:sn-u:sn2u; status assigned
Structure: Ga2Zr · oC12 · Cmmm (65); type st:ga2zr-oc12; 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: Sn 0.6667, U 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1627.22 K, x(U) 0.33333–0.33333
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:sn-u:sn2u
paper: paper:10.1007/s11669-021-00872-2:USn2
tdb: tdb:SnU-21Wan.tdb:SN2U

TDB models of SN2U (1): PHASE and CONSTITUENT statements as written

SnU-21Wan.tdb: SN2U, type code %, sha256 bfb5a924fae70c95…

83: PHASE SN2U %  2 2 1 !
84: CONST SN2U : SN : U : !

Example references (3 of 3; assessments first):

doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01463-9 A. Palenzona, P. Manfrinetti, The phase diagram of the USn system, Journal of Alloys and Compounds 221, 157-160 (1995).
cited as the source of values for this phase
doi:10.1016/j.jct.2015.08.029 J. Wang, K. Wang, C.H. Ma, and L.D. Xie, J. Wang, K. Wang, C.H. Ma, and L.D. Xie, Critical Evaluation and Thermodynamic Optimization of the (U ? Bi), (U ? Si) and (U ? Sn) Binary Systems, J. Chem. Thermodyn., 2016, 92, p 158–167
cited as the source of values for this phase

SN2U3 (Sn–U)

Id: phase:sn-u:sn2u3; status assigned
Structure: Ga4Ti5 · hP18 · P6_3/mcm (193); type st:ga4ti5-hp18; 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: Sn 0.4000, U 0.6000
Stability: stable in 1 of 1 calculated diagram(s): 300–1695.57 K, x(U) 0.6–0.6
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:sn-u:sn2u3
paper: paper:10.1007/bf02869271:Sn2U3
tdb: tdb:SnU-87She.tdb:SN2U3

TDB models of SN2U3 (1): PHASE and CONSTITUENT statements as written

SnU-87She.tdb: SN2U3, type code %, sha256 52159592cd32f1c5…

76: PHASE SN2U3 %  2 2 3 !
77: CONST SN2U3 : SN : U : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase; reports values for this phase

SN3U_L12 (Sn–U)

Id: phase:sn-u:sn3u-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-aaaabece and oqmd-18132, space group 221
Stoichiometry: Sn 0.7500, U 0.2500
Stability: stable in 2 of 2 calculated diagram(s): 300–1604.74 K, x(U) 0.25–0.25
Literature: 10 values (10 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:sn-u:sn3u-l12
mp: mp:mp-aaaabece
oqmd: oqmd:oqmd-18132
paper: paper:10.1007/bf02869271:Sn3U, paper:10.1007/s11669-021-00872-2:USn3
tdb: tdb:SnU-21Wan.tdb:SN3U_L12, tdb:SnU-87She.tdb:SN3U_L12

TDB models of SN3U_L12 (2): PHASE and CONSTITUENT statements as written

SnU-21Wan.tdb: SN3U_L12, type code %, sha256 bfb5a924fae70c95…

73: PHASE SN3U_L12 %  2 3 1 !
74: CONST SN3U_L12 : SN : U : !

SnU-87She.tdb: SN3U_L12, type code %, sha256 52159592cd32f1c5…

66: PHASE SN3U_L12 %  2 3 1 !
67: CONST SN3U_L12 : SN : U : !

Example references (4 of 4; assessments first):

doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01463-9 A. Palenzona, P. Manfrinetti, The phase diagram of the USn system, Journal of Alloys and Compounds 221, 157-160 (1995).
cited as the source of values for this phase
doi:10.1016/j.jct.2015.08.029 J. Wang, K. Wang, C.H. Ma, and L.D. Xie, J. Wang, K. Wang, C.H. Ma, and L.D. Xie, Critical Evaluation and Thermodynamic Optimization of the (U ? Bi), (U ? Si) and (U ? Sn) Binary Systems, J. Chem. Thermodyn., 2016, 92, p 158–167
cited as the source of values for this phase

SN4U5 (Sn–U)

Id: phase:sn-u:sn4u5; status assigned
Structure: Ga4Ti5 · hP18 · P6_3/mcm (193); type st:ga4ti5-hp18; 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: Sn 0.4444, U 0.5556
Stability: stable in 1 of 1 calculated diagram(s): 300–1664.19 K, x(U) 0.55556–0.55556
Literature: 15 values (15 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:sn-u:sn4u5
paper: paper:10.1007/s11669-021-00872-2:U5Sn4
tdb: tdb:SnU-21Wan.tdb:SN4U5

TDB models of SN4U5 (1): PHASE and CONSTITUENT statements as written

SnU-21Wan.tdb: SN4U5, type code %, sha256 bfb5a924fae70c95…

93: PHASE SN4U5 %  2 4 5 !
94: CONST SN4U5 : SN : U : !

Example references (3 of 3; assessments first):

doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01463-9 A. Palenzona, P. Manfrinetti, The phase diagram of the USn system, Journal of Alloys and Compounds 221, 157-160 (1995).
cited as the source of values for this phase
doi:10.1016/j.jct.2015.08.029 J. Wang, K. Wang, C.H. Ma, and L.D. Xie, J. Wang, K. Wang, C.H. Ma, and L.D. Xie, Critical Evaluation and Thermodynamic Optimization of the (U ? Bi), (U ? Si) and (U ? Sn) Binary Systems, J. Chem. Thermodyn., 2016, 92, p 158–167
cited as the source of values for this phase

SN5U3 (Sn–U)

Id: phase:sn-u:sn5u3; status assigned
Structure: Ga2Zr · oC12 · Cmmm (65); type st:ga2zr-oc12; 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: Sn 0.6250, U 0.3750
Stability: stable in 1 of 1 calculated diagram(s): 300–1619.62 K, x(U) 0.375–0.375
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:sn-u:sn5u3
paper: paper:10.1007/bf02869271:Sn5U3
tdb: tdb:SnU-87She.tdb:SN5U3

TDB models of SN5U3 (1): PHASE and CONSTITUENT statements as written

SnU-87She.tdb: SN5U3, type code %, sha256 52159592cd32f1c5…

71: PHASE SN5U3 %  2 5 3 !
72: CONST SN5U3 : SN : U : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase; reports values for this phase

SN7U3 (Sn–U)

Id: phase:sn-u:sn7u3; status assigned
Structure: Ce3Sn7 · oC20 · Cmmm (65); type st:ce3sn7-oc20; 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_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Sn 0.7000, U 0.3000
Stability: stable in 1 of 1 calculated diagram(s): 300–1615.46 K, x(U) 0.3–0.3
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:sn-u:sn7u3
paper: paper:10.1007/s11669-021-00872-2:U3Sn7
tdb: tdb:SnU-21Wan.tdb:SN7U3

TDB models of SN7U3 (1): PHASE and CONSTITUENT statements as written

SnU-21Wan.tdb: SN7U3, type code %, sha256 bfb5a924fae70c95…

78: PHASE SN7U3 %  2 7 3 !
79: CONST SN7U3 : SN : U : !

Example references (3 of 3; assessments first):

doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01463-9 A. Palenzona, P. Manfrinetti, The phase diagram of the USn system, Journal of Alloys and Compounds 221, 157-160 (1995).
cited as the source of values for this phase
doi:10.1016/j.jct.2015.08.029 J. Wang, K. Wang, C.H. Ma, and L.D. Xie, J. Wang, K. Wang, C.H. Ma, and L.D. Xie, Critical Evaluation and Thermodynamic Optimization of the (U ? Bi), (U ? Si) and (U ? Sn) Binary Systems, J. Chem. Thermodyn., 2016, 92, p 158–167
cited as the source of values for this phase

SNU (Sn–U)

Id: phase:sn-u:snu; status assigned
Structure: InTh · oP24 · Pbcm (57); type st:inth-op24; 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: Sn 0.5000, U 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1661.44 K, x(U) 0.5–0.5
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:sn-u:snu
paper: paper:10.1007/s11669-021-00872-2:USn
tdb: tdb:SnU-21Wan.tdb:SNU

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

SnU-21Wan.tdb: SNU, type code %, sha256 bfb5a924fae70c95…

88: PHASE SNU %  2 1 1 !
89: CONST SNU : SN : U : !

Example references (3 of 3; assessments first):

doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(94)01463-9 A. Palenzona, P. Manfrinetti, The phase diagram of the USn system, Journal of Alloys and Compounds 221, 157-160 (1995).
cited as the source of values for this phase
doi:10.1016/j.jct.2015.08.029 J. Wang, K. Wang, C.H. Ma, and L.D. Xie, J. Wang, K. Wang, C.H. Ma, and L.D. Xie, Critical Evaluation and Thermodynamic Optimization of the (U ? Bi), (U ? Si) and (U ? Sn) Binary Systems, J. Chem. Thermodyn., 2016, 92, p 158–167
cited as the source of values for this phase

TETRAGONAL_U (Sn–U)

Id: phase:sn-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 — SnU-21Wan.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Candidate (tdb_comment): beta-U · tP30 · P4_2/mnm, SB: A_b — SnU-87She.tdb: 'Prototype beta-U (tP30, P4_2/mnm, SB: A_b)'
Stability: stable in 2 of 2 calculated diagram(s): 942.02–1403.83 K, x(U) 0.99999–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:sn-u:u-tetragonal, corpus:phase:sn-u:tetragonal-u
paper: paper:10.1007/s11669-021-00872-2:Tetragonal_U
tdb: tdb:SnU-21Wan.tdb:TETRAGONAL_U, tdb:SnU-87She.tdb:TETRAGONAL_U

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

SnU-21Wan.tdb: TETRAGONAL_U, type code %, sha256 bfb5a924fae70c95…

68: PHASE TETRAGONAL_U % 1 1 !
69: CONST TETRAGONAL_U : SN U% : !

SnU-87She.tdb: TETRAGONAL_U, type code %, sha256 52159592cd32f1c5…

61: PHASE TETRAGONAL_U % 1 1 !
62: CONST TETRAGONAL_U : U : !

Example references (4 of 4; assessments first):

doi:10.1007/s11669-021-00872-2 Jun Wang, Yuan Yuan, Xiongying Cheng, Qin Zhang, Rongjian Pan, Aitao Tang, Thermodynamic Assessment of the U-Sn System and Extension to the U-Zr-Sn System, J. Phase Equilib. Diffus. 42, 194-205 (2021).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02869271 R.I. Sheldon, E.M. Foltyn, D.E. Petersen, Bull. Alloy Phase Diag., 8, 347-52(1987).
assessment that models this phase
doi:10.1016/0925-8388(94)01463-9 A. Palenzona, P. Manfrinetti, The phase diagram of the USn system, Journal of Alloys and Compounds 221, 157-160 (1995).
cited as the source of values for this phase
doi:10.1016/j.jct.2015.08.029 J. Wang, K. Wang, C.H. Ma, and L.D. Xie, J. Wang, K. Wang, C.H. Ma, and L.D. Xie, Critical Evaluation and Thermodynamic Optimization of the (U ? Bi), (U ? Si) and (U ? Sn) Binary Systems, J. Chem. Thermodyn., 2016, 92, p 158–167
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}
}