Se–Sn phases

7 phases (tier A 6, liquid 1); 6 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 · Se–Sn system page · Markdown · field reference

Phases of the Se–Sn system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:se-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:se-sn:a5-bct	beta-Sn · A5 · tI4 · I4_1/amd (141)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–505.06 K, x(Se) 0–0	17	1
HEXAGONAL_A8 phase:se-sn:a8-hexagonal	gamma-Se · A8 · hP3 · P3_121 (152)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–493.92 K, x(Se) 1–1	10	1
LIQUID phase:se-sn:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 493.92–2500 K, x(Se) 0–1	68	1
SNSE_B16 phase:se-sn:snse-b16	GeS · B16 · oP8 · Pnma (62)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–796.51 K, x(Se) 0.5–0.5	45	1
SNSE_B33 phase:se-sn:snse-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 796.51–1146.92 K, x(Se) 0.5–0.5	27	1
SNSE2_C6 phase:se-sn:snse2-c6	CdI2 · C6 · hP3 · P-3m1 (164)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–920.37 K, x(Se) 0.66667–0.66667	44	1

DIAMOND_A4 (Se–Sn)

Id: phase:se-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

Names (2): corpus: corpus:phase:se-sn:a4-diamond
tdb: tdb:SnSe-96Feu-LB.tdb:DIAMOND_A4

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

SnSe-96Feu-LB.tdb: DIAMOND_A4, type code %, sha256 1a2bab98ceb7b79f…

30: PHASE DIAMOND_A4 % 1 1 !
31: CONST DIAMOND_A4 : SN : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02648368 Y. Feutelais, M. Majid, B. Legendre, S.G. Fries, J. Phase Equilib., 17, 40-49(1996).
assessment that models this phase

BCT_A5 (Se–Sn)

Id: phase:se-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): 300–505.06 K, x(Se) 0–0
Literature: 17 values (17 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:se-sn:a5-bct, corpus:phase:se-sn:bct-a5
paper: paper:10.1007/bf02648368:βSn
tdb: tdb:SnSe-96Feu-LB.tdb:BCT_A5

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

SnSe-96Feu-LB.tdb: BCT_A5, type code %, sha256 1a2bab98ceb7b79f…

35: PHASE BCT_A5 % 1 1 !
36: CONST BCT_A5 : SN : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02648368 Y. Feutelais, M. Majid, B. Legendre, S.G. Fries, J. Phase Equilib., 17, 40-49(1996).
assessment that models this phase; reports values for this phase

HEXAGONAL_A8 (Se–Sn)

Id: phase:se-sn:a8-hexagonal; status assigned
Structure: gamma-Se · A8 · hP3 · P3_121 (152); type st:a8-gamma-se-hp3; tier A: standard phase name; confidence high
Stoichiometry: Se 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–493.92 K, x(Se) 1–1
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:se-sn:a8-hexagonal, corpus:phase:se-sn:hexagonal-a8
paper: paper:10.1007/bf02648368:Se
tdb: tdb:SnSe-96Feu-LB.tdb:HEXAGONAL_A8

TDB models of HEXAGONAL_A8 (1): PHASE and CONSTITUENT statements as written

SnSe-96Feu-LB.tdb: HEXAGONAL_A8, type code %, sha256 1a2bab98ceb7b79f…

40: PHASE HEXAGONAL_A8 % 1 1 !
41: CONST HEXAGONAL_A8 : SE : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02648368 Y. Feutelais, M. Majid, B. Legendre, S.G. Fries, J. Phase Equilib., 17, 40-49(1996).
assessment that models this phase; reports values for this phase

LIQUID (Se–Sn)

Id: phase:se-sn:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 493.92–2500 K, x(Se) 0–1
Literature: 68 values (68 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:se-sn:liquid
paper: paper:10.1007/bf02648368:L1, paper:10.1007/bf02648368:L2, paper:10.1007/bf02648368:liquid
tdb: tdb:SnSe-96Feu-LB.tdb:LIQUID

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

SnSe-96Feu-LB.tdb: LIQUID, type code %, sha256 1a2bab98ceb7b79f…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : SE SN SNSE : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02648368 Y. Feutelais, M. Majid, B. Legendre, S.G. Fries, J. Phase Equilib., 17, 40-49(1996).
assessment that models this phase; reports values for this phase
doi:10.2320/matertrans1989.35.118 Katsunori Yamaguchi, Kazuo Kameda, Yoichi Takeda, Kimio Itagaki, Measurements of High Temperature Heat Content of the II&ndash;VI and IV&ndash;VI (II: Zn, Cd IV: Sn, Pb VI: Se, Te) Compounds, Mater. Trans., JIM 35, 118-124 (1994).
cited as the source of values for this phase

SNSE_B16 (Se–Sn)

Id: phase:se-sn:snse-b16; status assigned
Structure: GeS · B16 · oP8 · Pnma (62); type st:b16-ges-op8; tier A: standard phase name; confidence high
Stoichiometry: Se 0.5000, Sn 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–796.51 K, x(Se) 0.5–0.5
Literature: 45 values (45 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:se-sn:snse-b16
paper: paper:10.1007/bf02648368:αSnSe
tdb: tdb:SnSe-96Feu-LB.tdb:SNSE_B16

TDB models of SNSE_B16 (1): PHASE and CONSTITUENT statements as written

SnSe-96Feu-LB.tdb: SNSE_B16, type code %, sha256 1a2bab98ceb7b79f…

45: PHASE SNSE_B16 % 2 1 1 !
46: CONST SNSE_B16 : SN : SE : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02648368 Y. Feutelais, M. Majid, B. Legendre, S.G. Fries, J. Phase Equilib., 17, 40-49(1996).
assessment that models this phase; reports values for this phase

SNSE_B33 (Se–Sn)

Id: phase:se-sn:snse-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; tier A: standard phase name; confidence high
Stoichiometry: Se 0.5000, Sn 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 796.51–1146.92 K, x(Se) 0.5–0.5
Literature: 27 values (27 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:se-sn:snse-b33
paper: paper:10.1007/bf02648368:βSnSe
tdb: tdb:SnSe-96Feu-LB.tdb:SNSE_B33

TDB models of SNSE_B33 (1): PHASE and CONSTITUENT statements as written

SnSe-96Feu-LB.tdb: SNSE_B33, type code %, sha256 1a2bab98ceb7b79f…

50: PHASE SNSE_B33 % 2 1 1 !
51: CONST SNSE_B33 : SN : SE : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02648368 Y. Feutelais, M. Majid, B. Legendre, S.G. Fries, J. Phase Equilib., 17, 40-49(1996).
assessment that models this phase; reports values for this phase

SNSE2_C6 (Se–Sn)

Id: phase:se-sn:snse2-c6; status assigned
Structure: CdI2 · C6 · hP3 · P-3m1 (164); type st:c6-cdi2-hp3; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaazp and oqmd-8151, space group 164
Stoichiometry: Se 0.6667, Sn 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–920.37 K, x(Se) 0.66667–0.66667
Literature: 44 values (44 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:se-sn:snse2-c6
mp: mp:mp-aaaaaazp
oqmd: oqmd:oqmd-8151
paper: paper:10.1007/bf02648368:SnSe2
tdb: tdb:SnSe-96Feu-LB.tdb:SNSE2_C6

TDB models of SNSE2_C6 (1): PHASE and CONSTITUENT statements as written

SnSe-96Feu-LB.tdb: SNSE2_C6, type code %, sha256 1a2bab98ceb7b79f…

55: PHASE SNSE2_C6 % 2 1 2 !
56: CONST SNSE2_C6 : SN : SE : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02648368 Y. Feutelais, M. Majid, B. Legendre, S.G. Fries, J. Phase Equilib., 17, 40-49(1996).
assessment that models this phase; reports values for this phase
doi:10.1016/0040-6031(92)87043-a Steve Boone, O.J. Kleppa, Enthalpies of formation for Group IV selenides (GeSe2, GeSe2(am), SnSe, SnSe2, PbSe) by direct-combination drop calorimetry, Thermochimica Acta 197, 109-121 (1992).
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}
}