As–Pt phases

7 phases (tier A 5, liquid 1, gas 1); 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 · As–Pt system page · Markdown · field reference

Phases of the As–Pt system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBOHEDRAL_A7 phase:as-pt:a7-rhombohedral	alpha-As · A7 · hR2 · R-3m (166)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–888.4 K, x(As) 1–1	1	1
BCC_A2 phase:as-pt:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
FCC_A1 phase:as-pt:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2048.36 K, x(As) 0–5e-05	3	1
GAS phase:as-pt:gas	gas	gas	stable in 1 of 1 calculated diagram(s): 888.4–2500 K, x(As) 1–1	0	1
HCP_A3 phase:as-pt:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LIQUID phase:as-pt:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 873.36–2500 K, x(As) 0–0.62307	6	1
PTAS2_C2 phase:as-pt:ptas2-c2	beta-FeS2 · C2 · cP12 · Pa-3 (205)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1735.83 K, x(As) 0.66667–0.66667	6	1

RHOMBOHEDRAL_A7 (As–Pt)

Id: phase:as-pt:a7-rhombohedral; status assigned
Structure: alpha-As · A7 · hR2 · R-3m (166); type st:a7-alpha-as-hr2; tier A: standard phase name; confidence high
Stoichiometry: As 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–888.4 K, x(As) 1–1
Literature: 1 values (1 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:as-pt:a7-rhombohedral, corpus:phase:as-pt:rhombohedral-a7
paper: paper:10.1016/j.jallcom.2006.07.063:Rhom(As)
tdb: tdb:PtAs-07Li.tdb:RHOMBOHEDRAL_A7

TDB models of RHOMBOHEDRAL_A7 (1): PHASE and CONSTITUENT statements as written

PtAs-07Li.tdb: RHOMBOHEDRAL_A7, type code %, sha256 27c15f179ff3234b…

48: PHASE RHOMBOHEDRAL_A7 % 1 1 !
49: CONST RHOMBOHEDRAL_A7 : AS : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2006.07.063 Mei Li, Changrong Li, Fuming Wang, Weijing Zhang, The thermodynamic assessment of the As–Pt system and the analysis of the Pt/GaAs interfacial reactions, Journal of Alloys and Compounds 437, 71-79 (2007).
assessment that models this phase; reports values for this phase

BCC_A2 (As–Pt)

Id: phase:as-pt: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:as-pt:bcc-a2
tdb: tdb:PtAs-07Li.tdb:BCC_A2

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

PtAs-07Li.tdb: BCC_A2, type code %B, sha256 27c15f179ff3234b…

38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : AS PT : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2006.07.063 Mei Li, Changrong Li, Fuming Wang, Weijing Zhang, The thermodynamic assessment of the As–Pt system and the analysis of the Pt/GaAs interfacial reactions, Journal of Alloys and Compounds 437, 71-79 (2007).
assessment that models this phase

FCC_A1 (As–Pt)

Id: phase:as-pt:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2048.36 K, x(As) 0–5e-05
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:as-pt:fcc-a1
paper: paper:10.1016/j.jallcom.2006.07.063:fcc(Pt)
tdb: tdb:PtAs-07Li.tdb:FCC_A1

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

PtAs-07Li.tdb: FCC_A1, type code %A, sha256 27c15f179ff3234b…

33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : AS PT% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2006.07.063 Mei Li, Changrong Li, Fuming Wang, Weijing Zhang, The thermodynamic assessment of the As–Pt system and the analysis of the Pt/GaAs interfacial reactions, Journal of Alloys and Compounds 437, 71-79 (2007).
assessment that models this phase; reports values for this phase

GAS (As–Pt)

Id: phase:as-pt:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 888.4–2500 K, x(As) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:as-pt:gas
tdb: tdb:PtAs-07Li.tdb:GAS

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

PtAs-07Li.tdb: GAS, type code %, sha256 27c15f179ff3234b…

56: PHASE GAS:G % 1 1 !
57: CONST GAS:G : AS% AS2 AS4 PT : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2006.07.063 Mei Li, Changrong Li, Fuming Wang, Weijing Zhang, The thermodynamic assessment of the As–Pt system and the analysis of the Pt/GaAs interfacial reactions, Journal of Alloys and Compounds 437, 71-79 (2007).
assessment that models this phase

HCP_A3 (As–Pt)

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

Names (2): corpus: corpus:phase:as-pt:hcp-a3
tdb: tdb:PtAs-07Li.tdb:HCP_A3

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

PtAs-07Li.tdb: HCP_A3, type code %A, sha256 27c15f179ff3234b…

43: PHASE HCP_A3 %A 2 1 0.5 !
44: CONST HCP_A3 : AS PT : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2006.07.063 Mei Li, Changrong Li, Fuming Wang, Weijing Zhang, The thermodynamic assessment of the As–Pt system and the analysis of the Pt/GaAs interfacial reactions, Journal of Alloys and Compounds 437, 71-79 (2007).
assessment that models this phase

LIQUID (As–Pt)

Id: phase:as-pt:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 873.36–2500 K, x(As) 0–0.62307
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:as-pt:liquid
paper: paper:10.1016/j.jallcom.2006.07.063:L
tdb: tdb:PtAs-07Li.tdb:LIQUID

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

PtAs-07Li.tdb: LIQUID, type code %, sha256 27c15f179ff3234b…

28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : AS PT : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.07.063 Mei Li, Changrong Li, Fuming Wang, Weijing Zhang, The thermodynamic assessment of the As–Pt system and the analysis of the Pt/GaAs interfacial reactions, Journal of Alloys and Compounds 437, 71-79 (2007).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02898270 H. Okamoto, Bull. Alloy Phase Diagrams 11 (1990) 508–510.
cited as the source of values for this phase

PTAS2_C2 (As–Pt)

Id: phase:as-pt:ptas2-c2; status assigned
Structure: beta-FeS2 · C2 · cP12 · Pa-3 (205); type st:c2-beta-fes2-cp12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaadsr and oqmd-4540, space group 205
Stoichiometry: As 0.6667, Pt 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1735.83 K, x(As) 0.66667–0.66667
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:as-pt:ptas2-c2
mp: mp:mp-aaaaadsr
oqmd: oqmd:oqmd-4540
paper: paper:10.1016/j.jallcom.2006.07.063:As2Pt
tdb: tdb:PtAs-07Li.tdb:PTAS2_C2

TDB models of PTAS2_C2 (1): PHASE and CONSTITUENT statements as written

PtAs-07Li.tdb: PTAS2_C2, type code %, sha256 27c15f179ff3234b…

53: PHASE PTAS2_C2 % 2 1 2 !
54: CONST PTAS2_C2 : PT : AS : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.07.063 Mei Li, Changrong Li, Fuming Wang, Weijing Zhang, The thermodynamic assessment of the As–Pt system and the analysis of the Pt/GaAs interfacial reactions, Journal of Alloys and Compounds 437, 71-79 (2007).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02898270 H. Okamoto, Bull. Alloy Phase Diagrams 11 (1990) 508–510.
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}
}