Co–In 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–In system page · Markdown · field reference

Phases of the Co–In system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
TETRAGONAL_A6 phase:co-in:a6-tetragonal	In · A6 · tI2 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–429.75 K, x(In) 1–1	2	1
BCC_A2 phase:co-in:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
COIN2_CB phase:co-in:coin2-cb	CuMg2 · C_b · oF48 · Fddd (70)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–824.26 K, x(In) 0.66667–0.66667	4	1
COIN3 phase:co-in:coin3	In3Ir · tP16 · P4_2/mnm (136)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–765.21 K, x(In) 0.75–0.75	4	1
FCC_A1 phase:co-in:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 695–1782.86 K, x(In) 0–5e-05	4	1
HCP_A3 phase:co-in:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–695 K, x(In) 0–0	0	1
LIQUID phase:co-in:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 429.75–2500 K, x(In) 0–1	8	1

TETRAGONAL_A6 (Co–In)

Id: phase:co-in:a6-tetragonal; status assigned
Structure: In · A6 · tI2 · I4/mmm (139); type st:a6-in-ti2; tier A: standard phase name; confidence high
Stoichiometry: In 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–429.75 K, x(In) 1–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:co-in:a6-tetragonal, corpus:phase:co-in:tetragonal-a6
paper: paper:10.1016/s0364-5916(02)00014-7:In
tdb: tdb:CoIn-01Boa-LB.tdb:TETRAGONAL_A6

TDB models of TETRAGONAL_A6 (1): PHASE and CONSTITUENT statements as written

CoIn-01Boa-LB.tdb: TETRAGONAL_A6, type code %, sha256 7b7830ea54945b1a…

40: PHASE TETRAGONAL_A6 % 1 1 !
41: CONST TETRAGONAL_A6 : IN : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(02)00014-7 D. Boa, B.K. Dongui, I. Ansara, Calphad, 25, 645-50(2001).
assessment that models this phase; reports values for this phase

BCC_A2 (Co–In)

Id: phase:co-in: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:co-in:bcc-a2
tdb: tdb:CoIn-01Boa-LB.tdb:BCC_A2

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

CoIn-01Boa-LB.tdb: BCC_A2, type code %B, sha256 7b7830ea54945b1a…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : CO IN : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(02)00014-7 D. Boa, B.K. Dongui, I. Ansara, Calphad, 25, 645-50(2001).
assessment that models this phase

COIN2_CB (Co–In)

Id: phase:co-in:coin2-cb; status assigned
Structure: CuMg2 · C_b · oF48 · Fddd (70); type st:c-b-cumg2-of48; tier A: standard phase name; confidence high
Stoichiometry: Co 0.3333, In 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–824.26 K, x(In) 0.66667–0.66667
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:co-in:coin2-cb
paper: paper:10.1016/s0364-5916(02)00014-7:CoIn2
tdb: tdb:CoIn-01Boa-LB.tdb:COIN2_CB

TDB models of COIN2_CB (1): PHASE and CONSTITUENT statements as written

CoIn-01Boa-LB.tdb: COIN2_CB, type code %, sha256 7b7830ea54945b1a…

45: PHASE COIN2_CB % 2 1 2 !
46: CONST COIN2_CB : CO : IN : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(02)00014-7 D. Boa, B.K. Dongui, I. Ansara, Calphad, 25, 645-50(2001).
assessment that models this phase; reports values for this phase

COIN3 (Co–In)

Id: phase:co-in:coin3; 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, In 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–765.21 K, x(In) 0.75–0.75
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-in:coin3
mp: mp:mp-aaaabgxg
oqmd: oqmd:oqmd-29374
paper: paper:10.1016/s0364-5916(02)00014-7:CoIn3
tdb: tdb:CoIn-01Boa-LB.tdb:COIN3

TDB models of COIN3 (1): PHASE and CONSTITUENT statements as written

CoIn-01Boa-LB.tdb: COIN3, type code %, sha256 7b7830ea54945b1a…

50: PHASE COIN3 % 2 1 3 !
51: CONST COIN3 : CO : IN : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(02)00014-7 D. Boa, B.K. Dongui, I. Ansara, Calphad, 25, 645-50(2001).
assessment that models this phase; reports values for this phase

FCC_A1 (Co–In)

Id: phase:co-in: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): 695–1782.86 K, x(In) 0–5e-05
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:co-in:fcc-a1
paper: paper:10.1016/s0364-5916(02)00014-7:(αCo)
tdb: tdb:CoIn-01Boa-LB.tdb:FCC_A1

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

CoIn-01Boa-LB.tdb: FCC_A1, type code %A, sha256 7b7830ea54945b1a…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : CO% IN : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(02)00014-7 D. Boa, B.K. Dongui, I. Ansara, Calphad, 25, 645-50(2001).
assessment that models this phase; reports values for this phase

HCP_A3 (Co–In)

Id: phase:co-in: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): 300–695 K, x(In) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-in:hcp-a3
tdb: tdb:CoIn-01Boa-LB.tdb:HCP_A3

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

CoIn-01Boa-LB.tdb: HCP_A3, type code %A, sha256 7b7830ea54945b1a…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : CO% IN : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(02)00014-7 D. Boa, B.K. Dongui, I. Ansara, Calphad, 25, 645-50(2001).
assessment that models this phase

LIQUID (Co–In)

Id: phase:co-in:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 429.75–2500 K, x(In) 0–1
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:co-in:liquid
paper: paper:10.1016/s0364-5916(02)00014-7:liq2
tdb: tdb:CoIn-01Boa-LB.tdb:LIQUID

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

CoIn-01Boa-LB.tdb: LIQUID, type code %, sha256 7b7830ea54945b1a…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : CO IN : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(02)00014-7 D. Boa, B.K. Dongui, I. Ansara, Calphad, 25, 645-50(2001).
assessment that models this phase; 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}
}