Co–Pt phases

7 phases (tier A 5, liquid 1, needs_review 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–Pt system page · Markdown · field reference

Phases of the Co–Pt system (7)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:co-pt:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 3 calculated diagram(s)	3
COPT_L10 phase:co-pt:copt-l10	AuCu · L1_0 · tP4 · P4/mmm (123)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1101.5 K, x(Pt) 0.39722–0.63247	1
COPT3_L12 phase:co-pt:copt3-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1026.9 K, x(Pt) 0.69701–0.77468	1
FCC_4SL phase:co-pt:fcc-4sl		needs_review	stable in 1 of 1 calculated diagram(s): 300–2041.5 K, x(Pt) 0–1	1
FCC_A1 phase:co-pt:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2499 K, x(Pt) 0–1	4
HCP_A3 phase:co-pt:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–887.96 K, x(Pt) 0–0.40323	3
LIQUID phase:co-pt:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 1700.78–2500 K, x(Pt) 0–1	3

BCC_A2 (Co–Pt)

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

Names (4): corpus: corpus:phase:co-pt:bcc-a2
tdb: tdb:CoPt-01Oik.tdb:BCC_A2, tdb:CoPt-11Kim.tdb:BCC_A2, tdb:CoPt-90Spe-LB.tdb:BCC_A2

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

CoPt-01Oik.tdb: BCC_A2, type code %B, sha256 adf708dbafc5b2c3…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : CO PT : VA : !

CoPt-11Kim.tdb: BCC_A2, type code %B, sha256 335cf2628217f37f…

42: PHASE BCC_A2 %B 2 1 3 !
43: CONST BCC_A2 : CO PT : VA : !

CoPt-90Spe-LB.tdb: BCC_A2, type code %B, sha256 8a9bf4d4f4636b89…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2011.04.005 DongEung Kim, James E. Saal, Liangcai Zhou, ShunLi Shang, Yong Du, Zi-Kui Liu, Thermodynamic modeling of fcc order/disorder transformations in the Co–Pt system, Calphad 35, 323-330 (2011).
assessment that models this phase
doi:10.1016/S0304-8853(00)00520-5 K. Oikawa, G.W. Qin, T. Ikeshoji, O. Kitakami, Y. Shimada, K. Ishida, K. Fukamichi, J. Magn. Magn. Mater., 236, 220-33(2001).
assessment that models this phase

COPT_L10 (Co–Pt)

Id: phase:co-pt:copt-l10; status assigned
Structure: AuCu · L1_0 · tP4 · P4/mmm (123); type st:l1-0-aucu-tp4; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1101.5 K, x(Pt) 0.39722–0.63247
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-pt:copt-l10
tdb: tdb:CoPt-90Spe-LB.tdb:COPT_L10

TDB models of COPT_L10 (1): PHASE and CONSTITUENT statements as written

CoPt-90Spe-LB.tdb: COPT_L10, type code %A, sha256 8a9bf4d4f4636b89…

40: PHASE COPT_L10 %A 1 1 !
41: CONST COPT_L10 : CO PT : !

COPT3_L12 (Co–Pt)

Id: phase:co-pt:copt3-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1026.9 K, x(Pt) 0.69701–0.77468
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-pt:copt3-l12
tdb: tdb:CoPt-90Spe-LB.tdb:COPT3_L12

TDB models of COPT3_L12 (1): PHASE and CONSTITUENT statements as written

CoPt-90Spe-LB.tdb: COPT3_L12, type code %A, sha256 8a9bf4d4f4636b89…

45: PHASE COPT3_L12 %A 1 1 !
46: CONST COPT3_L12 : CO PT : !

FCC_4SL (Co–Pt)

Id: phase:co-pt:fcc-4sl; status needs_review
No structure assigned. Why: order_disorder_ambiguity:CoPt-11Kim.tdb_model_is_partitioned; sgte_mmc2_row_disagrees_with_name:FCC_4SL; sgte_mmc2_rows_disagree; unrecognised_name_tokens:4SL
Candidate (dft_mp): P6_3/mmc (194) — on-hull MP Co3Pt at x(PT)=0.2500
Candidate (dft_mp): P4/mmm (123) — on-hull MP CoPt at x(PT)=0.5000
Candidate (dft_mp): Pm-3m (221) — on-hull MP CoPt3 at x(PT)=0.7500
Candidate (dft_oqmd): I4/mmm (139) — on-hull OQMD Co1 Pt2 at x(PT)=0.6667
Candidate (dft_oqmd): I4/mmm (139) — on-hull OQMD Co1 Pt8 at x(PT)=0.8889
Candidate (dft_oqmd): Pm (6) — on-hull OQMD Co19 Pt1 at x(PT)=0.0500
Candidate (dft_oqmd): C2/m (12) — on-hull OQMD Co2 Pt7 at x(PT)=0.7778
Candidate (dft_oqmd): P63/mmc (194) — on-hull OQMD Co3 Pt1 at x(PT)=0.2500
Stability: stable in 1 of 1 calculated diagram(s): 300–2041.5 K, x(Pt) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:co-pt:fcc-4sl
tdb: tdb:CoPt-11Kim.tdb:FCC_4SL

TDB models of FCC_4SL (1): PHASE and CONSTITUENT statements as written

CoPt-11Kim.tdb: FCC_4SL, type code %AY, sha256 335cf2628217f37f…

37: PHASE FCC_4SL:F %AY 5 0.25 0.25 0.25 0.25 1 !
38: CONST FCC_4SL:F : CO PT : CO PT : CO PT : CO PT : VA :  !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2011.04.005 DongEung Kim, James E. Saal, Liangcai Zhou, ShunLi Shang, Yong Du, Zi-Kui Liu, Thermodynamic modeling of fcc order/disorder transformations in the Co–Pt system, Calphad 35, 323-330 (2011).
assessment that models this phase

FCC_A1 (Co–Pt)

Id: phase:co-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 3 of 3 calculated diagram(s): 300–2499 K, x(Pt) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-pt:fcc-a1
tdb: tdb:CoPt-01Oik.tdb:FCC_A1, tdb:CoPt-11Kim.tdb:A1_FCC, tdb:CoPt-11Kim.tdb:FCC_A1, tdb:CoPt-90Spe-LB.tdb:FCC_A1

TDB models of FCC_A1 (4): PHASE and CONSTITUENT statements as written

CoPt-01Oik.tdb: FCC_A1, type code %A, sha256 adf708dbafc5b2c3…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : CO% PT% : VA : !

CoPt-11Kim.tdb: A1_FCC, type code %A, sha256 335cf2628217f37f…

32: PHASE A1_FCC %A 2 1 1 !
33: CONST A1_FCC : CO PT : VA : !

CoPt-11Kim.tdb: FCC_A1, type code %A, sha256 335cf2628217f37f…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : CO% PT% : VA : !

CoPt-90Spe-LB.tdb: FCC_A1, type code %A, sha256 8a9bf4d4f4636b89…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2011.04.005 DongEung Kim, James E. Saal, Liangcai Zhou, ShunLi Shang, Yong Du, Zi-Kui Liu, Thermodynamic modeling of fcc order/disorder transformations in the Co–Pt system, Calphad 35, 323-330 (2011).
assessment that models this phase
doi:10.1016/S0304-8853(00)00520-5 K. Oikawa, G.W. Qin, T. Ikeshoji, O. Kitakami, Y. Shimada, K. Ishida, K. Fukamichi, J. Magn. Magn. Mater., 236, 220-33(2001).
assessment that models this phase

HCP_A3 (Co–Pt)

Id: phase:co-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: stable in 3 of 3 calculated diagram(s): 300–887.96 K, x(Pt) 0–0.40323
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:co-pt:hcp-a3
tdb: tdb:CoPt-01Oik.tdb:HCP_A3, tdb:CoPt-11Kim.tdb:HCP_A3, tdb:CoPt-90Spe-LB.tdb:HCP_A3

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

CoPt-01Oik.tdb: HCP_A3, type code %A, sha256 adf708dbafc5b2c3…

37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : CO% PT : VA : !

CoPt-11Kim.tdb: HCP_A3, type code %A, sha256 335cf2628217f37f…

47: PHASE HCP_A3 %A 2 1 0.5 !
48: CONST HCP_A3 : CO% PT : VA : !

CoPt-90Spe-LB.tdb: HCP_A3, type code %A, sha256 8a9bf4d4f4636b89…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2011.04.005 DongEung Kim, James E. Saal, Liangcai Zhou, ShunLi Shang, Yong Du, Zi-Kui Liu, Thermodynamic modeling of fcc order/disorder transformations in the Co–Pt system, Calphad 35, 323-330 (2011).
assessment that models this phase
doi:10.1016/S0304-8853(00)00520-5 K. Oikawa, G.W. Qin, T. Ikeshoji, O. Kitakami, Y. Shimada, K. Ishida, K. Fukamichi, J. Magn. Magn. Mater., 236, 220-33(2001).
assessment that models this phase

LIQUID (Co–Pt)

Id: phase:co-pt:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 1700.78–2500 K, x(Pt) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:co-pt:liquid
tdb: tdb:CoPt-01Oik.tdb:LIQUID, tdb:CoPt-11Kim.tdb:LIQUID, tdb:CoPt-90Spe-LB.tdb:LIQUID

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

CoPt-01Oik.tdb: LIQUID, type code %, sha256 adf708dbafc5b2c3…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : CO PT : !

CoPt-11Kim.tdb: LIQUID, type code %, sha256 335cf2628217f37f…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : CO PT : !

CoPt-90Spe-LB.tdb: LIQUID, type code %, sha256 8a9bf4d4f4636b89…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2011.04.005 DongEung Kim, James E. Saal, Liangcai Zhou, ShunLi Shang, Yong Du, Zi-Kui Liu, Thermodynamic modeling of fcc order/disorder transformations in the Co–Pt system, Calphad 35, 323-330 (2011).
assessment that models this phase
doi:10.1016/S0304-8853(00)00520-5 K. Oikawa, G.W. Qin, T. Ikeshoji, O. Kitakami, Y. Shimada, K. Ishida, K. Fukamichi, J. Magn. Magn. Mater., 236, 220-33(2001).
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}
}