# Sm–Sn phases

> Sm–Sn system: 14 phases (tier A 9, tier C 3, liquid 1, needs_review 1); 12 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references.

HTML: https://data.orchid-project.org/phases/pages/SM-SN.html · Markdown: https://data.orchid-project.org/phases/pages/SM-SN.md

14 phases (tier A 9, tier C 3, 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](https://orchid-project.org/phases/?q=SM-SN) · [full JSON](https://data.orchid-project.org/phases/systems/SM-SN.json) · [Sm–Sn system page](https://data.orchid-project.org/systems/SM-SN.html) · [Markdown](https://data.orchid-project.org/phases/pages/SM-SN.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Sm–Sn system (14)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [DIAMOND_A4](#phase-sm-sn-a4-diamond); _phase:sm-sn:a4-diamond_ | C (diamond) · A4 · cF8 · Fd-3m (227) | tier A: standard phase name | not stable in 1 calculated diagram(s) | 0 | 1 |
| [BCT_A5](#phase-sm-sn-a5-bct); _phase:sm-sn:a5-bct_ | beta-Sn · A5 · tI4 · I4_1/amd (141) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–505.08 K, x(Sn) 1–1 | 2 | 1 |
| [BCC_A2](#phase-sm-sn-bcc-a2); _phase:sm-sn:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1189.13–1354.13 K, x(Sn) 0–0.0018 | 2 | 1 |
| [FCC_A1](#phase-sm-sn-fcc-a1); _phase:sm-sn:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | not stable in 1 calculated diagram(s) | 0 | 1 |
| [HCP_A3](#phase-sm-sn-hcp-a3); _phase:sm-sn:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1006.96–1220 K, x(Sn) 0–1e-05 | 0 | 1 |
| [LIQUID](#phase-sm-sn-liquid); _phase:sm-sn:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 504.19–2500 K, x(Sn) 0–1 | 23 | 1 |
| [RHOMB_C19](#phase-sm-sn-rhomb-c19); _phase:sm-sn:rhomb-c19_ | CdCl2 · C19 · hR3 · R-3m (166) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1191.96 K, x(Sn) 0–0 | 0 | 1 |
| [SM11SN10](#phase-sm-sn-sm11sn10); _phase:sm-sn:sm11sn10_ | Ge10Ho11 · tI84 · I4/mmm (139) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 1472.87–1491.21 K, x(Sn) 0.47619–0.47619 | 4 | 1 |
| [SM2SN3](#phase-sm-sn-sm2sn3); _phase:sm-sn:sm2sn3_ | Nd2Sn3 · aP20 · P-1 (2) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1377.89 K, x(Sn) 0.6–0.6 | 3 | 1 |
| [SM4SN3_D73](#phase-sm-sn-sm4sn3-d73); _phase:sm-sn:sm4sn3-d73_ | Th3P4 · D7_3 · cI28 · I-43d (220) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1713.67 K, x(Sn) 0.42857–0.42857 | 4 | 1 |
| [SM5SN3_D88](#phase-sm-sn-sm5sn3-d88); _phase:sm-sn:sm5sn3-d88_ | Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1778.27 K, x(Sn) 0.375–0.375 | 6 | 1 |
| [SM5SN4](#phase-sm-sn-sm5sn4); _phase:sm-sn:sm5sn4_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–1690.91 K, x(Sn) 0.44444–0.44444 | 8 | 1 |
| [SMSN2](#phase-sm-sn-smsn2); _phase:sm-sn:smsn2_ | Ga2Zr · oC12 · Cmmm (65) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1365.94 K, x(Sn) 0.66667–0.66667 | 3 | 1 |
| [SMSN3_L12](#phase-sm-sn-smsn3-l12); _phase:sm-sn:smsn3-l12_ | AuCu3 · L1_2 · cP4 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1363.3 K, x(Sn) 0.75–0.75 | 6 | 1 |

## DIAMOND_A4 (Sm–Sn)

- Id: `phase:sm-sn: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 1 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:a4-diamond)

Names (2): _corpus: _corpus:phase:sm-sn:a4-diamond  
_tdb: _tdb:SmSn-14Liu.tdb:DIAMOND_A4  


### TDB models of DIAMOND_A4 (1): PHASE and CONSTITUENT statements as written

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): DIAMOND_A4, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
47: PHASE DIAMOND_A4 % 1 1 !
48: CONST DIAMOND_A4 : SN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase_

## BCT_A5 (Sm–Sn)

- Id: `phase:sm-sn: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
- Stoichiometry: Sn 1.0000
- Stability: stable in 1 of 1 calculated diagram(s): 300–505.08 K, x(Sn) 1–1
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:a5-bct)

Names (4): _corpus: _corpus:phase:sm-sn:a5-bct, corpus:phase:sm-sn:bct-a5  
_paper: _paper:10.1016/j.calphad.2014.07.002:(Sn)  
_tdb: _tdb:SmSn-14Liu.tdb:BCT_A5  


### TDB models of BCT_A5 (1): PHASE and CONSTITUENT statements as written

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): BCT_A5, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
52: PHASE BCT_A5 % 1 1 !
53: CONST BCT_A5 : SN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase; reports values for this phase_

## BCC_A2 (Sm–Sn)

- Id: `phase:sm-sn: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): 1189.13–1354.13 K, x(Sn) 0–0.0018
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:bcc-a2)

Names (3): _corpus: _corpus:phase:sm-sn:bcc-a2  
_paper: _paper:10.1016/j.calphad.2014.07.002:(γSm)  
_tdb: _tdb:SmSn-14Liu.tdb:BCC_A2  


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

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): BCC_A2, type code %B, sha256 `4fa8160a500d1d85…`

~~~~text
37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : SM% SN : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase; reports values for this phase_

## FCC_A1 (Sm–Sn)

- Id: `phase:sm-sn:fcc-a1`; status `assigned`
- Structure: Cu · A1 · cF4 · Fm-3m (225); type `st:a1-cu-cf4`; tier A: standard phase name; confidence high
- Stoichiometry: Sn 1.0000
- Stability: not stable in 1 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:fcc-a1)

Names (2): _corpus: _corpus:phase:sm-sn:fcc-a1  
_tdb: _tdb:SmSn-14Liu.tdb:FCC_A1  


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

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): FCC_A1, type code %A, sha256 `4fa8160a500d1d85…`

~~~~text
32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : SN : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase_

## HCP_A3 (Sm–Sn)

- Id: `phase:sm-sn: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: stable in 1 of 1 calculated diagram(s): 1006.96–1220 K, x(Sn) 0–1e-05
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:hcp-a3)

Names (2): _corpus: _corpus:phase:sm-sn:hcp-a3  
_tdb: _tdb:SmSn-14Liu.tdb:HCP_A3  


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

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): HCP_A3, type code %A, sha256 `4fa8160a500d1d85…`

~~~~text
42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : SM% SN : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase_

## LIQUID (Sm–Sn)

- Id: `phase:sm-sn:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 504.19–2500 K, x(Sn) 0–1
- Literature: 23 values (23 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:liquid)

Names (3): _corpus: _corpus:phase:sm-sn:liquid  
_paper: _paper:10.1016/j.calphad.2014.07.002:L  
_tdb: _tdb:SmSn-14Liu.tdb:LIQUID  


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

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): LIQUID, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : SM SN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase; reports values for this phase_

## RHOMB_C19 (Sm–Sn)

- Id: `phase:sm-sn:rhomb-c19`; status `assigned`
- Structure: CdCl2 · C19 · hR3 · R-3m (166); type `st:c19-cdcl2-hr3`; tier A: standard phase name; confidence high
- Stoichiometry: Sm 1.0000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1191.96 K, x(Sn) 0–0
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:rhomb-c19)

Names (2): _corpus: _corpus:phase:sm-sn:rhomb-c19  
_tdb: _tdb:SmSn-14Liu.tdb:RHOMB_C19  


### TDB models of RHOMB_C19 (1): PHASE and CONSTITUENT statements as written

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): RHOMB_C19, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
57: PHASE RHOMB_C19 % 1 1 !
58: CONST RHOMB_C19 : SM : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase_

## SM11SN10 (Sm–Sn)

- Id: `phase:sm-sn:sm11sn10`; status `assigned`
- Structure: Ge10Ho11 · tI84 · I4/mmm (139); type `st:ge10ho11-ti84`; 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](https://doi.org/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: Sm 0.5238, Sn 0.4762
- Stability: stable in 1 of 1 calculated diagram(s): 1472.87–1491.21 K, x(Sn) 0.47619–0.47619
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:sm11sn10)

Names (3): _corpus: _corpus:phase:sm-sn:sm11sn10  
_paper: _paper:10.1016/j.calphad.2014.07.002:Sm11Sn10  
_tdb: _tdb:SmSn-14Liu.tdb:SM11SN10  


### TDB models of SM11SN10 (1): PHASE and CONSTITUENT statements as written

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): SM11SN10, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
77: PHASE SM11SN10 % 2 11 10 !
78: CONST SM11SN10 : SM : SN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase; reports values for this phase_

## SM2SN3 (Sm–Sn)

- Id: `phase:sm-sn:sm2sn3`; status `assigned`
- Structure: Nd2Sn3 · aP20 · P-1 (2); type `st:nd2sn3-ap20`; 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](https://doi.org/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: Sm 0.4000, Sn 0.6000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1377.89 K, x(Sn) 0.6–0.6
- Literature: 3 values (3 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:sm2sn3)

Names (3): _corpus: _corpus:phase:sm-sn:sm2sn3  
_paper: _paper:10.1016/j.calphad.2014.07.002:Sm2Sn3  
_tdb: _tdb:SmSn-14Liu.tdb:SM2SN3  


### TDB models of SM2SN3 (1): PHASE and CONSTITUENT statements as written

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): SM2SN3, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
82: PHASE SM2SN3 % 2 2 3 !
83: CONST SM2SN3 : SM : SN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase; reports values for this phase_

## SM4SN3_D73 (Sm–Sn)

- Id: `phase:sm-sn:sm4sn3-d73`; status `assigned`
- Structure: Th3P4 · D7_3 · cI28 · I-43d (220); type `st:d7-3-th3p4-ci28`; tier A: standard phase name; confidence high
- Stoichiometry: Sm 0.5714, Sn 0.4286
- Stability: stable in 1 of 1 calculated diagram(s): 300–1713.67 K, x(Sn) 0.42857–0.42857
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:sm4sn3-d73)

Names (3): _corpus: _corpus:phase:sm-sn:sm4sn3-d73  
_paper: _paper:10.1016/j.calphad.2014.07.002:Sm4Sn3  
_tdb: _tdb:SmSn-14Liu.tdb:SM4SN3_D73  


### TDB models of SM4SN3_D73 (1): PHASE and CONSTITUENT statements as written

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): SM4SN3_D73, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
67: PHASE SM4SN3_D73 % 2 4 3 !
68: CONST SM4SN3_D73 : SM : SN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase; reports values for this phase_

## SM5SN3_D88 (Sm–Sn)

- Id: `phase:sm-sn:sm5sn3-d88`; status `assigned`
- Structure: Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193); type `st:d8-8-mn5si3-hp16`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaacpsek and oqmd-31076, space group 193
- Stoichiometry: Sm 0.6250, Sn 0.3750
- Stability: stable in 1 of 1 calculated diagram(s): 300–1778.27 K, x(Sn) 0.375–0.375
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:sm5sn3-d88)

Names (5): _corpus: _corpus:phase:sm-sn:sm5sn3-d88  
_mp: _mp:mp-aaacpsek  
_oqmd: _oqmd:oqmd-31076  
_paper: _paper:10.1016/j.calphad.2014.07.002:Sm5Sn3  
_tdb: _tdb:SmSn-14Liu.tdb:SM5SN3_D88  


### TDB models of SM5SN3_D88 (1): PHASE and CONSTITUENT statements as written

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): SM5SN3_D88, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
62: PHASE SM5SN3_D88 % 2 5 3 !
63: CONST SM5SN3_D88 : SM : SN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase; reports values for this phase_

## SM5SN4 (Sm–Sn)

- Id: `phase:sm-sn:sm5sn4`; status `needs_review`
- No structure assigned. Why: dft_space_group_62_matches_2_structure_types; no_structure_token
- Candidate (dft_mp): Pnma (62) — on-hull MP Sm5Sn4 at x(SN)=0.4444
- Candidate (dft_oqmd): Pnma (62) — on-hull OQMD Sm5 Sn4 at x(SN)=0.4444
- Candidate (dft_space_group_and_stoichiometry): Gd5Si4 · oP36 · Pnma (62) — space group 62 and stoichiometry match
- Candidate (dft_space_group_and_stoichiometry): Ge4Sm5 · oP36 · Pnma (62) — space group 62 and stoichiometry match
- Candidate (literature_printed): Ge4Sm5 · oP36 — printed with a label mapped to this phase
- Candidate (sgte_mmc2): Ge4Sm5 · oP36 · Pnma (62) — Hallstedt 2025 mmc2 row for SM5SN4: Sn5Sn4
- Candidate (tdb_comment): Ge4Sm5 · oP36 · Pnma — SmSn-14Liu.tdb: 'Prototype Ge4Sm5 (oP36, Pnma)'
- Stoichiometry: Sm 0.5556, Sn 0.4444
- Stability: stable in 1 of 1 calculated diagram(s): 300–1690.91 K, x(Sn) 0.44444–0.44444
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:sm5sn4)

Names (3): _corpus: _corpus:phase:sm-sn:sm5sn4  
_paper: _paper:10.1016/j.calphad.2014.07.002:Sm5Sn4  
_tdb: _tdb:SmSn-14Liu.tdb:SM5SN4  


### TDB models of SM5SN4 (1): PHASE and CONSTITUENT statements as written

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): SM5SN4, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
72: PHASE SM5SN4 % 2 5 4 !
73: CONST SM5SN4 : SM : SN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase; reports values for this phase_

## SMSN2 (Sm–Sn)

- Id: `phase:sm-sn:smsn2`; 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](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (mp_oqmd_space_groups_differ, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Sm 0.3333, Sn 0.6667
- Stability: stable in 1 of 1 calculated diagram(s): 300–1365.94 K, x(Sn) 0.66667–0.66667
- Literature: 3 values (3 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:smsn2)

Names (3): _corpus: _corpus:phase:sm-sn:smsn2  
_paper: _paper:10.1016/j.calphad.2014.07.002:SmSn2  
_tdb: _tdb:SmSn-14Liu.tdb:SMSN2  


### TDB models of SMSN2 (1): PHASE and CONSTITUENT statements as written

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): SMSN2, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
87: PHASE SMSN2 % 2 1 2 !
88: CONST SMSN2 : SM : SN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase; reports values for this phase_

## SMSN3_L12 (Sm–Sn)

- Id: `phase:sm-sn:smsn3-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: Sm 0.2500, Sn 0.7500
- Stability: stable in 1 of 1 calculated diagram(s): 300–1363.3 K, x(Sn) 0.75–0.75
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:sm-sn:smsn3-l12)

Names (3): _corpus: _corpus:phase:sm-sn:smsn3-l12  
_paper: _paper:10.1016/j.calphad.2014.07.002:SmSn3  
_tdb: _tdb:SmSn-14Liu.tdb:SMSN3_L12  


### TDB models of SMSN3_L12 (1): PHASE and CONSTITUENT statements as written

[SmSn-14Liu.tdb](https://orchid-project.org/data/databases/sgte-binary/SmSn-14Liu.tdb): SMSN3_L12, type code %, sha256 `4fa8160a500d1d85…`

~~~~text
92: PHASE SMSN3_L12 % 2 1 3 !
93: CONST SMSN3_L12 : SM : SN : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/j.calphad.2014.07.002](https://doi.org/10.1016/j.calphad.2014.07.002) X.J. Liu, M.H. Chen, Y. Lu, Y.X. Huang, D. Wang, Q. He et al., Thermodynamic assessment of the Sb–Sm and Sm–Sn systems, Calphad 47, 129-135 (2014).  
_assessment that models this phase; reports 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). https://doi.org/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). https://doi.org/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.

```bibtex
@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}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).