Co–Ga phases

7 phases (tier A 5, tier B 1, 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 · Co–Ga system page · Markdown · field reference

Phases of the Co–Ga system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
ORTHORHOMBIC_A11 phase:co-ga:a11-orthorhombic	alpha-Ga · A11 · oC8 · Cmce (64)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–302.91 K, x(Ga) 1–1	2	3
BCC_A2 phase:co-ga:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
COGA_B2 phase:co-ga:coga-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2500 K, x(Ga) 0.22551–0.71442	22	3
COGA3 phase:co-ga:coga3	In3Ir · tP16 · P4_2/mnm (136)	tier B: DFT-supported (unique MP + OQMD match)	stable in 3 of 3 calculated diagram(s): 300–1132.33 K, x(Ga) 0.75–0.75	19	3
FCC_A1 phase:co-ga:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1768.99 K, x(Ga) 0–0.19684	12	3
HCP_A3 phase:co-ga:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–701.98 K, x(Ga) 0–0.10938	0	3
LIQUID phase:co-ga:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 302.91–2500 K, x(Ga) 0–1	20	3

ORTHORHOMBIC_A11 (Co–Ga)

Id: phase:co-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 3 of 3 calculated diagram(s): 300–302.91 K, x(Ga) 1–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:co-ga:a11-orthorhombic, corpus:phase:co-ga:orthorhombic-a11
paper: paper:10.1016/j.calphad.2010.02.004:Orthorhombic Ga
tdb: tdb:CoGa-05Su.tdb:ORTHORHOMBIC_A11, tdb:CoGa-10Cha.tdb:ORTHORHOMBIC_A11, tdb:CoGa-99Gro.tdb:ORTHORHOMBIC_A11

TDB models of ORTHORHOMBIC_A11 (3): PHASE and CONSTITUENT statements as written

CoGa-05Su.tdb: ORTHORHOMBIC_A11, type code %, sha256 d465d6a3ab86a311…

43: PHASE ORTHORHOMBIC_A11 % 1 1 !
44: CONST ORTHORHOMBIC_A11 : GA : !

CoGa-10Cha.tdb: ORTHORHOMBIC_A11, type code %, sha256 d36d75154ff187ec…

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

CoGa-99Gro.tdb: ORTHORHOMBIC_A11, type code %, sha256 119f21425d794516…

43: PHASE ORTHORHOMBIC_A11 % 1 1 !
44: CONST ORTHORHOMBIC_A11 : GA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2010.02.004 Arpita Chari, Andres Garay, Raymundo Arróyave, Thermodynamic remodeling of the Co–Ga system, Calphad 34, 189-195 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2004.08.003 Xuping Su, Jean-Claude Tedenac, Thermodynamic modeling of the cobalt–gallium system, Intermetallics 13, 467-473 (2005).
assessment that models this phase
doi:10.1361/105497199770340608 J. Gröbner, R. Wenzel, G. G. Fischer, R. Schmid-Fetzer, Thermodynamic calculation of the binary systems M-Ga and investigation of ternary M-Ga-N phase equilibria (M=Ni, Co, Pd, Cr), JPE 20, 615-625 (1999).
assessment that models this phase

BCC_A2 (Co–Ga)

Id: phase:co-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 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:co-ga:bcc-a2
tdb: tdb:CoGa-05Su.tdb:BCC_A2, tdb:CoGa-10Cha.tdb:BCC_A2, tdb:CoGa-99Gro.tdb:BCC_A2

TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written

CoGa-05Su.tdb: BCC_A2, type code %B, sha256 d465d6a3ab86a311…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : CO GA : VA : !

CoGa-10Cha.tdb: BCC_A2, type code %B, sha256 d36d75154ff187ec…

43: PHASE BCC_A2 %B 2 1 3 !
44: CONST BCC_A2 : CO GA : VA : !

CoGa-99Gro.tdb: BCC_A2, type code %B, sha256 119f21425d794516…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : CO GA : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2010.02.004 Arpita Chari, Andres Garay, Raymundo Arróyave, Thermodynamic remodeling of the Co–Ga system, Calphad 34, 189-195 (2010).
assessment that models this phase
doi:10.1016/j.intermet.2004.08.003 Xuping Su, Jean-Claude Tedenac, Thermodynamic modeling of the cobalt–gallium system, Intermetallics 13, 467-473 (2005).
assessment that models this phase
doi:10.1361/105497199770340608 J. Gröbner, R. Wenzel, G. G. Fischer, R. Schmid-Fetzer, Thermodynamic calculation of the binary systems M-Ga and investigation of ternary M-Ga-N phase equilibria (M=Ni, Co, Pd, Cr), JPE 20, 615-625 (1999).
assessment that models this phase

COGA_B2 (Co–Ga)

Id: phase:co-ga:coga-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 300–2500 K, x(Ga) 0.22551–0.71442
Literature: 22 values (22 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:co-ga:coga-b2
paper: paper:10.1016/j.calphad.2010.02.004:β, paper:10.1016/j.intermet.2004.08.003:β
system_alias: system_alias:co-ga:beta
tdb: tdb:CoGa-05Su.tdb:COGA_B2, tdb:CoGa-10Cha.tdb:COGA_B2, tdb:CoGa-99Gro.tdb:COGA_B2

TDB models of COGA_B2 (3): PHASE and CONSTITUENT statements as written

CoGa-05Su.tdb: COGA_B2, type code %, sha256 d465d6a3ab86a311…

48: PHASE COGA_B2 % 2 0.5 0.5 !
49: CONST COGA_B2 : CO% VA : CO GA% : !

CoGa-10Cha.tdb: COGA_B2, type code %, sha256 d36d75154ff187ec…

58: PHASE COGA_B2 % 2 0.5 0.5 !
59: CONST COGA_B2 : CO GA% : CO% VA : !

CoGa-99Gro.tdb: COGA_B2, type code %, sha256 119f21425d794516…

48: PHASE COGA_B2 % 2 0.5 0.5 !
49: CONST COGA_B2 : CO% VA : CO GA% : !

Example references (4 of 4; assessments first):

doi:10.1016/j.calphad.2010.02.004 Arpita Chari, Andres Garay, Raymundo Arróyave, Thermodynamic remodeling of the Co–Ga system, Calphad 34, 189-195 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2004.08.003 Xuping Su, Jean-Claude Tedenac, Thermodynamic modeling of the cobalt–gallium system, Intermetallics 13, 467-473 (2005).
assessment that models this phase; reports values for this phase
doi:10.1361/105497199770340608 J. Gröbner, R. Wenzel, G. G. Fischer, R. Schmid-Fetzer, Thermodynamic calculation of the binary systems M-Ga and investigation of ternary M-Ga-N phase equilibria (M=Ni, Co, Pd, Cr), JPE 20, 615-625 (1999).
assessment that models this phase
doi:10.1088/0305-4608/10/10/008 G L Whittle, P E Clark, R Cywinski, Vacancies and site occupation in Co-Ga-Fe alloys (Mossbauer study), J. Phys. F: Met. Phys. 10, 2093-2104 (1980).
cited as the source of values for this phase

COGA3 (Co–Ga)

Id: phase:co-ga:coga3; status assigned
Structure: In3Ir · tP16 · P4_2/mnm (136); type st:in3ir-tp16; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Co 0.2500, Ga 0.7500
Stability: stable in 3 of 3 calculated diagram(s): 300–1132.33 K, x(Ga) 0.75–0.75
Literature: 19 values (19 accepted) from 3 papers
Interactive: phase registry entry

Names (9): corpus: corpus:phase:co-ga:coga3
mp: mp:mp-aaaabekt
oqmd: oqmd:oqmd-29254
paper: paper:10.1016/j.calphad.2010.02.004:CoGa3, paper:10.1016/j.intermet.2004.08.003:CoGa3, paper:10.1361/105497199770340608:CoGa3
tdb: tdb:CoGa-05Su.tdb:COGA3, tdb:CoGa-10Cha.tdb:COGA3, tdb:CoGa-99Gro.tdb:COGA3

TDB models of COGA3 (3): PHASE and CONSTITUENT statements as written

CoGa-05Su.tdb: COGA3, type code %, sha256 d465d6a3ab86a311…

53: PHASE COGA3 % 2 1 3 !
54: CONST COGA3 : CO : GA : !

CoGa-10Cha.tdb: COGA3, type code %, sha256 d36d75154ff187ec…

63: PHASE COGA3 % 2 1 3 !
64: CONST COGA3 : CO : GA : !

CoGa-99Gro.tdb: COGA3, type code %, sha256 119f21425d794516…

53: PHASE COGA3 % 2 1 3 !
54: CONST COGA3 : CO : GA : !

Example references (5 of 5; assessments first):

doi:10.1016/j.calphad.2010.02.004 Arpita Chari, Andres Garay, Raymundo Arróyave, Thermodynamic remodeling of the Co–Ga system, Calphad 34, 189-195 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2004.08.003 Xuping Su, Jean-Claude Tedenac, Thermodynamic modeling of the cobalt–gallium system, Intermetallics 13, 467-473 (2005).
assessment that models this phase; reports values for this phase
doi:10.1361/105497199770340608 J. Gröbner, R. Wenzel, G. G. Fischer, R. Schmid-Fetzer, Thermodynamic calculation of the binary systems M-Ga and investigation of ternary M-Ga-N phase equilibria (M=Ni, Co, Pd, Cr), JPE 20, 615-625 (1999).
assessment that models this phase; reports values for this phase
doi:10.1016/s0925-8388(97)00223-5 H. Meyer, M. Ellner, On the solubility of aluminium in the intermetallic compound CoGa3, Journal of Alloys and Compounds 261, 250-253 (1997).
cited as the source of values for this phase
doi:10.1016/0040-6031(75)85065-9 Bruno Predel, Wolfgang Vogelbein, Udo Schallner, Thermodynamische untersuchung des systems nickel-gallium, Thermochimica Acta 12, 367-375 (1975).
cited as the source of values for this phase

FCC_A1 (Co–Ga)

Id: phase:co-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: stable in 3 of 3 calculated diagram(s): 300–1768.99 K, x(Ga) 0–0.19684
Literature: 12 values (12 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:co-ga:fcc-a1
paper: paper:10.1016/j.calphad.2010.02.004:fcc, paper:10.1016/j.intermet.2004.08.003:(αCo)
tdb: tdb:CoGa-05Su.tdb:FCC_A1, tdb:CoGa-10Cha.tdb:FCC_A1, tdb:CoGa-99Gro.tdb:FCC_A1

TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written

CoGa-05Su.tdb: FCC_A1, type code %A, sha256 d465d6a3ab86a311…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : CO% GA : VA : !

CoGa-10Cha.tdb: FCC_A1, type code %A, sha256 d36d75154ff187ec…

38: PHASE FCC_A1 %A 2 1 1 !
39: CONST FCC_A1 : CO% GA : VA : !

CoGa-99Gro.tdb: FCC_A1, type code %A, sha256 119f21425d794516…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : CO% GA : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2010.02.004 Arpita Chari, Andres Garay, Raymundo Arróyave, Thermodynamic remodeling of the Co–Ga system, Calphad 34, 189-195 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2004.08.003 Xuping Su, Jean-Claude Tedenac, Thermodynamic modeling of the cobalt–gallium system, Intermetallics 13, 467-473 (2005).
assessment that models this phase; reports values for this phase
doi:10.1361/105497199770340608 J. Gröbner, R. Wenzel, G. G. Fischer, R. Schmid-Fetzer, Thermodynamic calculation of the binary systems M-Ga and investigation of ternary M-Ga-N phase equilibria (M=Ni, Co, Pd, Cr), JPE 20, 615-625 (1999).
assessment that models this phase

HCP_A3 (Co–Ga)

Id: phase:co-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: stable in 3 of 3 calculated diagram(s): 300–701.98 K, x(Ga) 0–0.10938
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:co-ga:hcp-a3
tdb: tdb:CoGa-05Su.tdb:HCP_A3, tdb:CoGa-10Cha.tdb:HCP_A3, tdb:CoGa-99Gro.tdb:HCP_A3

TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written

CoGa-05Su.tdb: HCP_A3, type code %A, sha256 d465d6a3ab86a311…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : CO% GA : VA : !

CoGa-10Cha.tdb: HCP_A3, type code %A, sha256 d36d75154ff187ec…

48: PHASE HCP_A3 %A 2 1 0.5 !
49: CONST HCP_A3 : CO% GA : VA : !

CoGa-99Gro.tdb: HCP_A3, type code %A, sha256 119f21425d794516…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : CO% GA : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2010.02.004 Arpita Chari, Andres Garay, Raymundo Arróyave, Thermodynamic remodeling of the Co–Ga system, Calphad 34, 189-195 (2010).
assessment that models this phase
doi:10.1016/j.intermet.2004.08.003 Xuping Su, Jean-Claude Tedenac, Thermodynamic modeling of the cobalt–gallium system, Intermetallics 13, 467-473 (2005).
assessment that models this phase
doi:10.1361/105497199770340608 J. Gröbner, R. Wenzel, G. G. Fischer, R. Schmid-Fetzer, Thermodynamic calculation of the binary systems M-Ga and investigation of ternary M-Ga-N phase equilibria (M=Ni, Co, Pd, Cr), JPE 20, 615-625 (1999).
assessment that models this phase

LIQUID (Co–Ga)

Id: phase:co-ga:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 302.91–2500 K, x(Ga) 0–1
Literature: 20 values (20 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:co-ga:liquid
paper: paper:10.1016/j.calphad.2010.02.004:Liq., paper:10.1016/j.intermet.2004.08.003:Liq.
tdb: tdb:CoGa-05Su.tdb:LIQUID, tdb:CoGa-10Cha.tdb:LIQUID, tdb:CoGa-99Gro.tdb:LIQUID

TDB models of LIQUID (3): PHASE and CONSTITUENT statements as written

CoGa-05Su.tdb: LIQUID, type code %, sha256 d465d6a3ab86a311…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : CO GA : !

CoGa-10Cha.tdb: LIQUID, type code %, sha256 d36d75154ff187ec…

33: PHASE LIQUID:L % 1 1 !
34: CONST LIQUID:L : CO GA : !

CoGa-99Gro.tdb: LIQUID, type code %, sha256 119f21425d794516…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : CO GA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2010.02.004 Arpita Chari, Andres Garay, Raymundo Arróyave, Thermodynamic remodeling of the Co–Ga system, Calphad 34, 189-195 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2004.08.003 Xuping Su, Jean-Claude Tedenac, Thermodynamic modeling of the cobalt–gallium system, Intermetallics 13, 467-473 (2005).
assessment that models this phase; reports values for this phase
doi:10.1361/105497199770340608 J. Gröbner, R. Wenzel, G. G. Fischer, R. Schmid-Fetzer, Thermodynamic calculation of the binary systems M-Ga and investigation of ternary M-Ga-N phase equilibria (M=Ni, Co, Pd, Cr), JPE 20, 615-625 (1999).
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}
}