O–Sn phases

11 phases (tier A 7, liquid 2, gas 2); 5 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 · Markdown · field reference

Phases of the O–Sn system (11)
Phase	Structure	Basis	Stability (calculated)	TDB models
DIAMOND_A4 phase:o-sn:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
BCT_A5 phase:o-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(O) 0–0	1
BCC_A2 phase:o-sn:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
FCC_A1 phase:o-sn:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
GAS phase:o-sn:gas	gas	gas	stable in 1 of 1 calculated diagram(s): 885.37–2500 K, x(O) 0.45617–1	1
HCP_A3 phase:o-sn:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
ION phase:o-sn:ion	liquid	liquid	stable in 1 of 1 calculated diagram(s): 505.08–2500 K, x(O) 0–0.52806	1
LIQUID phase:o-sn:liquid	liquid	liquid	not stable in 1 calculated diagram(s)	1
O2GAS phase:o-sn:o2gas	gas	gas	stable in 1 of 1 calculated diagram(s): 300–315 K, x(O) 1–1	1
SNO_B10 phase:o-sn:sno-b10	PbO-L · B10 · tP4 · P4/nmm (129)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
SNO2_C4 phase:o-sn:sno2-c4	TiO2 · C4 · tP6 · P4_2/mnm (136)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1589.87 K, x(O) 0.66667–0.66667	1

DIAMOND_A4 (O–Sn)

Id: phase:o-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:o-sn:a4-diamond
tdb: tdb:SnO-97Ans-LB.tdb:DIAMOND_A4

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

SnO-97Ans-LB.tdb: DIAMOND_A4, type code %, sha256 db1f690792a9c1a3…

61: PHASE DIAMOND_A4 % 1 1 !
62: CONST DIAMOND_A4 : SN : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
assessment that models this phase

BCT_A5 (O–Sn)

Id: phase:o-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(O) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-sn:a5-bct
tdb: tdb:SnO-97Ans-LB.tdb:BCT_A5

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

SnO-97Ans-LB.tdb: BCT_A5, type code %, sha256 db1f690792a9c1a3…

66: PHASE BCT_A5 % 1 1 !
67: CONST BCT_A5 : SN : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
assessment that models this phase

BCC_A2 (O–Sn)

Id: phase:o-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: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-sn:bcc-a2
tdb: tdb:SnO-97Ans-LB.tdb:BCC_A2

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

SnO-97Ans-LB.tdb: BCC_A2, type code %B, sha256 db1f690792a9c1a3…

51: PHASE BCC_A2 %B 2 1 3 !
52: CONST BCC_A2 : SN : O VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
assessment that models this phase

FCC_A1 (O–Sn)

Id: phase:o-sn: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 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-sn:fcc-a1
tdb: tdb:SnO-97Ans-LB.tdb:FCC_A1

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

SnO-97Ans-LB.tdb: FCC_A1, type code %A, sha256 db1f690792a9c1a3…

46: PHASE FCC_A1 %A 2 1 1 !
47: CONST FCC_A1 : SN : O VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
assessment that models this phase

GAS (O–Sn)

Id: phase:o-sn:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 885.37–2500 K, x(O) 0.45617–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-sn:gas
tdb: tdb:SnO-97Ans-LB.tdb:GAS

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

SnO-97Ans-LB.tdb: GAS, type code %, sha256 db1f690792a9c1a3…

79: PHASE GAS:G % 1 1 !
80: CONST GAS:G : O O2% O3 SN SN2 SNO SNO2 : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
assessment that models this phase

HCP_A3 (O–Sn)

Id: phase:o-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
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:o-sn:hcp-a3
tdb: tdb:SnO-97Ans-LB.tdb:HCP_A3

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

SnO-97Ans-LB.tdb: HCP_A3, type code %A, sha256 db1f690792a9c1a3…

56: PHASE HCP_A3 %A 2 1 0.5 !
57: CONST HCP_A3 : SN : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
assessment that models this phase

ION (O–Sn)

Id: phase:o-sn:ion; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 505.08–2500 K, x(O) 0–0.52806
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-sn:ion
tdb: tdb:SnO-97Ans-LB.tdb:ION

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

SnO-97Ans-LB.tdb: ION, type code %, sha256 db1f690792a9c1a3…

38: PHASE ION:Y % 2 1 1 !
39: CONST ION:Y : SN+2 : O-2 VA SNO2 : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
assessment that models this phase

LIQUID (O–Sn)

Id: phase:o-sn:liquid; status assigned
Structure: liquid; type st:liquid; liquid; 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:o-sn:liquid
tdb: tdb:SnO-97Ans-LB.tdb:LIQUID

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

SnO-97Ans-LB.tdb: LIQUID, type code %, sha256 db1f690792a9c1a3…

41: PHASE LIQUID:L % 1 1 !
42: CONST LIQUID:L : SN : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
assessment that models this phase

O2GAS (O–Sn)

Id: phase:o-sn:o2gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–315 K, x(O) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-sn:o2gas
tdb: tdb:SnO-97Ans-LB.tdb:O2GAS

TDB models of O2GAS (1): PHASE and CONSTITUENT statements as written

SnO-97Ans-LB.tdb: O2GAS, type code %, sha256 db1f690792a9c1a3…

82: PHASE O2GAS % 1 1 !
83: CONST O2GAS : O2 : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
assessment that models this phase

SNO_B10 (O–Sn)

Id: phase:o-sn:sno-b10; status assigned
Structure: PbO-L · B10 · tP4 · P4/nmm (129); type st:b10-pbo-l-tp4; tier A: standard phase name; confidence high
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:o-sn:sno-b10
tdb: tdb:SnO-97Ans-LB.tdb:SNO_B10

TDB models of SNO_B10 (1): PHASE and CONSTITUENT statements as written

SnO-97Ans-LB.tdb: SNO_B10, type code %, sha256 db1f690792a9c1a3…

76: PHASE SNO_B10:I % 2 1 1 !
77: CONST SNO_B10:I : SN+2 : O-2 : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
assessment that models this phase

SNO2_C4 (O–Sn)

Id: phase:o-sn:sno2-c4; status assigned
Structure: TiO2 · C4 · tP6 · P4_2/mnm (136); type st:c4-tio2-tp6; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1589.87 K, x(O) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:o-sn:sno2-c4
tdb: tdb:SnO-97Ans-LB.tdb:SNO2_C4

TDB models of SNO2_C4 (1): PHASE and CONSTITUENT statements as written

SnO-97Ans-LB.tdb: SNO2_C4, type code %, sha256 db1f690792a9c1a3…

71: PHASE SNO2_C4 % 2 1 2 !
72: CONST SNO2_C4 : SN+4 : O-2 : !

Example references (1 of 1; assessments first):

doi:10.1016/S0925-8388(96)02652-7 I. Ansara, N. Dupin, unpublshed work, 1997.
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}
}