As–Ga phases

8 phases (tier A 6, 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–Ga system page · Markdown · field reference

Phases of the As–Ga system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
ORTHORHOMBIC_A11 phase:as-ga:a11-orthorhombic	alpha-Ga · A11 · oC8 · Cmce (64)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–302.91 K, x(As) 0–0	0	1
RHOMBOHEDRAL_A7 phase:as-ga: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	0	1
ZINCBLENDE_B3 phase:as-ga:b3-zincblende	ZnS (sphalerite) · B3 · cF8 · F-43m (216)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1509.4 K, x(As) 0.5–0.5	0	1
BCC_A2 phase:as-ga: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-ga:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
GAS phase:as-ga:gas	gas	gas	stable in 1 of 1 calculated diagram(s): 888.4–2500 K, x(As) 0–1	0	1
HCP_A3 phase:as-ga: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-ga:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 302.91–2472.5 K, x(As) 0–0.52815	43	1

ORTHORHOMBIC_A11 (As–Ga)

Id: phase:as-ga:a11-orthorhombic; status assigned
Structure: alpha-Ga · A11 · oC8 · Cmce (64); type st:a11-alpha-ga-oc8; tier A: standard phase name; confidence high
Stoichiometry: Ga 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–302.91 K, x(As) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:as-ga:a11-orthorhombic
tdb: tdb:GaAs-90Cha-LB.tdb:ORTHORHOMBIC_A11

TDB models of ORTHORHOMBIC_A11 (1): PHASE and CONSTITUENT statements as written

GaAs-90Cha-LB.tdb: ORTHORHOMBIC_A11, type code %, sha256 4cf956589b2e1f0f…

52: PHASE ORTHORHOMBIC_A11 % 1 1 !
53: CONST ORTHORHOMBIC_A11 : GA : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(90)90021-Q C. Chatillon, I. Ansara, A. Watson, B.B. Argent, Calphad, 14, 203-14(1990).
assessment that models this phase

RHOMBOHEDRAL_A7 (As–Ga)

Id: phase:as-ga: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: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:as-ga:a7-rhombohedral
tdb: tdb:GaAs-90Cha-LB.tdb:RHOMBOHEDRAL_A7

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

GaAs-90Cha-LB.tdb: RHOMBOHEDRAL_A7, type code %, sha256 4cf956589b2e1f0f…

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

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(90)90021-Q C. Chatillon, I. Ansara, A. Watson, B.B. Argent, Calphad, 14, 203-14(1990).
assessment that models this phase

ZINCBLENDE_B3 (As–Ga)

Id: phase:as-ga:b3-zincblende; status assigned
Structure: ZnS (sphalerite) · B3 · cF8 · F-43m (216); type st:b3-zns-sphalerite-cf8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaadtm and oqmd-7551, space group 216
Stoichiometry: As 0.5000, Ga 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1509.4 K, x(As) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:as-ga:b3-zincblende
mp: mp:mp-aaaaadtm
oqmd: oqmd:oqmd-7551
tdb: tdb:GaAs-90Cha-LB.tdb:ZINCBLENDE_B3

TDB models of ZINCBLENDE_B3 (1): PHASE and CONSTITUENT statements as written

GaAs-90Cha-LB.tdb: ZINCBLENDE_B3, type code %, sha256 4cf956589b2e1f0f…

57: PHASE ZINCBLENDE_B3 % 2 1 1 !
58: CONST ZINCBLENDE_B3 : GA : AS : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(90)90021-Q C. Chatillon, I. Ansara, A. Watson, B.B. Argent, Calphad, 14, 203-14(1990).
assessment that models this phase

BCC_A2 (As–Ga)

Id: phase:as-ga: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-ga:bcc-a2
tdb: tdb:GaAs-90Cha-LB.tdb:BCC_A2

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

GaAs-90Cha-LB.tdb: BCC_A2, type code %B, sha256 4cf956589b2e1f0f…

37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : AS GA : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(90)90021-Q C. Chatillon, I. Ansara, A. Watson, B.B. Argent, Calphad, 14, 203-14(1990).
assessment that models this phase

FCC_A1 (As–Ga)

Id: phase:as-ga: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:as-ga:fcc-a1
tdb: tdb:GaAs-90Cha-LB.tdb:FCC_A1

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

GaAs-90Cha-LB.tdb: FCC_A1, type code %A, sha256 4cf956589b2e1f0f…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : AS GA : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(90)90021-Q C. Chatillon, I. Ansara, A. Watson, B.B. Argent, Calphad, 14, 203-14(1990).
assessment that models this phase

GAS (As–Ga)

Id: phase:as-ga: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) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:as-ga:gas
tdb: tdb:GaAs-90Cha-LB.tdb:GAS

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

GaAs-90Cha-LB.tdb: GAS, type code %, sha256 4cf956589b2e1f0f…

60: PHASE GAS:G % 1 1 !
61: CONST GAS:G : AS AS2 AS4 GAAS GA GA2 : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(90)90021-Q C. Chatillon, I. Ansara, A. Watson, B.B. Argent, Calphad, 14, 203-14(1990).
assessment that models this phase

HCP_A3 (As–Ga)

Id: phase:as-ga: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-ga:hcp-a3
tdb: tdb:GaAs-90Cha-LB.tdb:HCP_A3

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

GaAs-90Cha-LB.tdb: HCP_A3, type code %A, sha256 4cf956589b2e1f0f…

42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : AS GA : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(90)90021-Q C. Chatillon, I. Ansara, A. Watson, B.B. Argent, Calphad, 14, 203-14(1990).
assessment that models this phase

LIQUID (As–Ga)

Id: phase:as-ga:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 302.91–2472.5 K, x(As) 0–0.52815
Literature: 43 values (43 accepted) from 2 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:as-ga:liquid
paper: paper:10.1016/0364-5916(84)90035-x:liquid, paper:10.1016/j.jallcom.2015.03.051:liquid
tdb: tdb:GaAs-90Cha-LB.tdb:LIQUID

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

GaAs-90Cha-LB.tdb: LIQUID, type code %, sha256 4cf956589b2e1f0f…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : AS GA : !

Example references (3 of 3; assessments first):

doi:10.1016/0364-5916(90)90021-Q C. Chatillon, I. Ansara, A. Watson, B.B. Argent, Calphad, 14, 203-14(1990).
assessment that models this phase
doi:10.1016/0364-5916(84)90035-x I. Ansara, D. Dutartre, Thermodynamic study of the Al-Ga-As-Ge system, Calphad 8, 323-342 (1984).
reports values for this phase
doi:10.1016/j.jallcom.2015.03.051 Masoomeh Ghasemi, Jonas Johansson, Thermodynamic assessment of the As–Zn and As–Ga–Zn systems, Journal of Alloys and Compounds 638, 95-102 (2015).
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). 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}
}