Ga–Sc phases

10 phases (tier A 6, tier C 3, liquid 1); 9 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 · Ga–Sc system page · Markdown · field reference

Phases of the Ga–Sc system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
ORTHORHOMBIC_A11 phase:ga-sc: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(Sc) 0–0	2	1
BCC_A2 phase:ga-sc:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1607.99–2499.24 K, x(Sc) 1–1	0	1
FCC_A1 phase:ga-sc:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
GA2SC phase:ga-sc:ga2sc	Hg2K · oI12 · Imma (74)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1422.72 K, x(Sc) 0.33333–0.33333	6	1
GA3SC_L12 phase:ga-sc:ga3sc-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1303.59 K, x(Sc) 0.25–0.25	4	1
GA3SC5 phase:ga-sc:ga3sc5	Ga3Y5 · mC32 · C2/m (12)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1710.7 K, x(Sc) 0.625–0.625	6	1
GA4SC5 phase:ga-sc:ga4sc5	Ge10Ho11 · tI84 · I4/mmm (139)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1509.27 K, x(Sc) 0.55556–0.55556	4	1
GASC_B33 phase:ga-sc:gasc-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1372.01 K, x(Sc) 0.5–0.5	4	1
HCP_A3 phase:ga-sc:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1812.99 K, x(Sc) 1–1	2	1
LIQUID phase:ga-sc:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 302.91–2500 K, x(Sc) 0–1	16	1

ORTHORHOMBIC_A11 (Ga–Sc)

Id: phase:ga-sc: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(Sc) 0–0
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ga-sc:a11-orthorhombic, corpus:phase:ga-sc:orthorhombic-a11
paper: paper:10.1016/j.jallcom.2007.09.067:orth(Ga)
tdb: tdb:GaSc-08Jun.tdb:ORTHORHOMBIC_A11

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

GaSc-08Jun.tdb: ORTHORHOMBIC_A11, type code %, sha256 d874299ef43a14d4…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.09.067 Z.K. Jun, L.B. Liu, H.S. Liu, X.M. Huang, Z.P. Jin, Thermodynamic assessment of the Ga–Sc and Ga–Tb systems, Journal of Alloys and Compounds 463, 511-515 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

BCC_A2 (Ga–Sc)

Id: phase:ga-sc:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1607.99–2499.24 K, x(Sc) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ga-sc:bcc-a2
tdb: tdb:GaSc-08Jun.tdb:BCC_A2

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

GaSc-08Jun.tdb: BCC_A2, type code %B, sha256 d874299ef43a14d4…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2007.09.067 Z.K. Jun, L.B. Liu, H.S. Liu, X.M. Huang, Z.P. Jin, Thermodynamic assessment of the Ga–Sc and Ga–Tb systems, Journal of Alloys and Compounds 463, 511-515 (2008).
assessment that models this phase

FCC_A1 (Ga–Sc)

Id: phase:ga-sc: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:ga-sc:fcc-a1
tdb: tdb:GaSc-08Jun.tdb:FCC_A1

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

GaSc-08Jun.tdb: FCC_A1, type code %A, sha256 d874299ef43a14d4…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2007.09.067 Z.K. Jun, L.B. Liu, H.S. Liu, X.M. Huang, Z.P. Jin, Thermodynamic assessment of the Ga–Sc and Ga–Tb systems, Journal of Alloys and Compounds 463, 511-515 (2008).
assessment that models this phase

GA2SC (Ga–Sc)

Id: phase:ga-sc:ga2sc; status assigned
Structure: Hg2K · oI12 · Imma (74); type st:hg2k-oi12; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ga 0.6667, Sc 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1422.72 K, x(Sc) 0.33333–0.33333
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ga-sc:ga2sc
paper: paper:10.1016/j.jallcom.2007.09.067:ScGa2
tdb: tdb:GaSc-08Jun.tdb:GA2SC

TDB models of GA2SC (1): PHASE and CONSTITUENT statements as written

GaSc-08Jun.tdb: GA2SC, type code %, sha256 d874299ef43a14d4…

53: PHASE GA2SC % 2 2 1 !
54: CONST GA2SC : GA : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.09.067 Z.K. Jun, L.B. Liu, H.S. Liu, X.M. Huang, Z.P. Jin, Thermodynamic assessment of the Ga–Sc and Ga–Tb systems, Journal of Alloys and Compounds 463, 511-515 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

GA3SC_L12 (Ga–Sc)

Id: phase:ga-sc:ga3sc-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaabjw and oqmd-30346, space group 221
Stoichiometry: Ga 0.7500, Sc 0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–1303.59 K, x(Sc) 0.25–0.25
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ga-sc:ga3sc-l12
mp: mp:mp-aaaaabjw
oqmd: oqmd:oqmd-30346
paper: paper:10.1016/j.jallcom.2007.09.067:ScGa3
tdb: tdb:GaSc-08Jun.tdb:GA3SC_L12

TDB models of GA3SC_L12 (1): PHASE and CONSTITUENT statements as written

GaSc-08Jun.tdb: GA3SC_L12, type code %, sha256 d874299ef43a14d4…

48: PHASE GA3SC_L12 % 2 3 1 !
49: CONST GA3SC_L12 : GA : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.09.067 Z.K. Jun, L.B. Liu, H.S. Liu, X.M. Huang, Z.P. Jin, Thermodynamic assessment of the Ga–Sc and Ga–Tb systems, Journal of Alloys and Compounds 463, 511-515 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

GA3SC5 (Ga–Sc)

Id: phase:ga-sc:ga3sc5; status assigned
Structure: Ga3Y5 · mC32 · C2/m (12); type st:ga3y5-mc32; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ga 0.3750, Sc 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 300–1710.7 K, x(Sc) 0.625–0.625
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ga-sc:ga3sc5
paper: paper:10.1016/j.jallcom.2007.09.067:Sc5Ga3
tdb: tdb:GaSc-08Jun.tdb:GA3SC5

TDB models of GA3SC5 (1): PHASE and CONSTITUENT statements as written

GaSc-08Jun.tdb: GA3SC5, type code %, sha256 d874299ef43a14d4…

68: PHASE GA3SC5 % 2 3 5 !
69: CONST GA3SC5 : GA : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.09.067 Z.K. Jun, L.B. Liu, H.S. Liu, X.M. Huang, Z.P. Jin, Thermodynamic assessment of the Ga–Sc and Ga–Tb systems, Journal of Alloys and Compounds 463, 511-515 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

GA4SC5 (Ga–Sc)

Id: phase:ga-sc:ga4sc5; status assigned
Structure: Ge10Ho11 · tI84 · I4/mmm (139); type st:ge10ho11-ti84; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ga 0.4444, Sc 0.5556
Stability: stable in 1 of 1 calculated diagram(s): 300–1509.27 K, x(Sc) 0.55556–0.55556
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ga-sc:ga4sc5
paper: paper:10.1016/j.jallcom.2007.09.067:Sc5Ga4
tdb: tdb:GaSc-08Jun.tdb:GA4SC5

TDB models of GA4SC5 (1): PHASE and CONSTITUENT statements as written

GaSc-08Jun.tdb: GA4SC5, type code %, sha256 d874299ef43a14d4…

63: PHASE GA4SC5 % 2 4 5 !
64: CONST GA4SC5 : GA : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.09.067 Z.K. Jun, L.B. Liu, H.S. Liu, X.M. Huang, Z.P. Jin, Thermodynamic assessment of the Ga–Sc and Ga–Tb systems, Journal of Alloys and Compounds 463, 511-515 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

GASC_B33 (Ga–Sc)

Id: phase:ga-sc:gasc-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaqwx and oqmd-30345, space group 63
Stoichiometry: Ga 0.5000, Sc 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1372.01 K, x(Sc) 0.5–0.5
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ga-sc:gasc-b33
mp: mp:mp-aaaaaqwx
oqmd: oqmd:oqmd-30345
paper: paper:10.1016/j.jallcom.2007.09.067:ScGa
tdb: tdb:GaSc-08Jun.tdb:GASC_B33

TDB models of GASC_B33 (1): PHASE and CONSTITUENT statements as written

GaSc-08Jun.tdb: GASC_B33, type code %, sha256 d874299ef43a14d4…

58: PHASE GASC_B33 % 2 1 1 !
59: CONST GASC_B33 : GA : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.09.067 Z.K. Jun, L.B. Liu, H.S. Liu, X.M. Huang, Z.P. Jin, Thermodynamic assessment of the Ga–Sc and Ga–Tb systems, Journal of Alloys and Compounds 463, 511-515 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

HCP_A3 (Ga–Sc)

Id: phase:ga-sc: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 1 of 1 calculated diagram(s): 300–1812.99 K, x(Sc) 1–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ga-sc:hcp-a3
paper: paper:10.1016/j.jallcom.2007.09.067:hcp(Sc)
tdb: tdb:GaSc-08Jun.tdb:HCP_A3

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

GaSc-08Jun.tdb: HCP_A3, type code %, sha256 d874299ef43a14d4…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.09.067 Z.K. Jun, L.B. Liu, H.S. Liu, X.M. Huang, Z.P. Jin, Thermodynamic assessment of the Ga–Sc and Ga–Tb systems, Journal of Alloys and Compounds 463, 511-515 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
cited as the source of values for this phase

LIQUID (Ga–Sc)

Id: phase:ga-sc:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 302.91–2500 K, x(Sc) 0–1
Literature: 16 values (16 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ga-sc:liquid
paper: paper:10.1016/j.jallcom.2007.09.067:L
tdb: tdb:GaSc-08Jun.tdb:LIQUID

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

GaSc-08Jun.tdb: LIQUID, type code %, sha256 d874299ef43a14d4…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2007.09.067 Z.K. Jun, L.B. Liu, H.S. Liu, X.M. Huang, Z.P. Jin, Thermodynamic assessment of the Ga–Sc and Ga–Tb systems, Journal of Alloys and Compounds 463, 511-515 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(79)90170-x S.P Yatsenko, A.A Semyannikov, B.G Semenov, K.A Chuntonov, Phase diagrams of rare earth metals with gallium, Journal of the Less Common Metals 64, 185-199 (1979).
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}
}