Cr–Pt phases

7 phases (tier A 4, liquid 1, needs_review 2); 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 · Cr–Pt system page · Markdown · field reference

Phases of the Cr–Pt system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:cr-pt:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2202.68 K, x(Pt) 0–0.0706	2	3
CR3PT_A15 phase:cr-pt:cr3pt-a15		needs_review	stable in 3 of 3 calculated diagram(s): 300–1904.94 K, x(Pt) 0.16476–0.25	7	3
CRPT3_L12 phase:cr-pt:crpt3-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1421.05 K, x(Pt) 0.37505–0.84228	0	1
FCC_4SL phase:cr-pt:fcc-4sl		needs_review	stable in 1 of 1 calculated diagram(s): 300–2050 K, x(Pt) 0.28697–1	4	1
FCC_A1 phase:cr-pt:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2062.24 K, x(Pt) 0.28028–1	8	4
HCP_A3 phase:cr-pt:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
LIQUID phase:cr-pt:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 1821.34–4000 K, x(Pt) 0–1	8	3

BCC_A2 (Cr–Pt)

Id: phase:cr-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: stable in 3 of 3 calculated diagram(s): 300–2202.68 K, x(Pt) 0–0.0706
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:cr-pt:bcc-a2
paper: paper:10.1016/j.msea.2008.10.059:Cr bcc, paper:10.1016/j.msea.2008.10.059:bcc
tdb: tdb:CrPt-01Oik.tdb:BCC_A2, tdb:CrPt-09Pre.tdb:BCC_A2, tdb:CrPt-98Spe-LB.tdb:BCC_A2

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

CrPt-01Oik.tdb: BCC_A2, type code %B, sha256 e67e8c07062774a0…

31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : CR% PT : VA : !

CrPt-09Pre.tdb: BCC_A2, type code %B, sha256 812667dfc13e00cf…

47: PHASE BCC_A2 %B 2 1 3 !
48: CONST BCC_A2 : CR% PT : VA : !

CrPt-98Spe-LB.tdb: BCC_A2, type code %B, sha256 82886ea74acc67cb…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : CR% PT : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.msea.2008.10.059 Johannes Preußner, Sara Prins, Rainer Völkl, Zi-Kui Liu, Uwe Glatzel, Determination of phases in the system chromium–platinum (Cr–Pt) and thermodynamic calculations, Materials Science and Engineering: A 510-511, 322-327 (2009).
assessment that models this phase; reports values for 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

CR3PT_A15 (Cr–Pt)

Id: phase:cr-pt:cr3pt-a15; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_A15; stoichiometry_contradicts_A15:CrPt-98Spe-LB.tdb
Candidate (literature_printed): Cr3Si · cP8 — printed with a label mapped to this phase
Candidate (name_token): Cr3Si · A15 · cP8 · Pm-3n (223) — Strukturbericht/word 'A15' in the TDB name
Candidate (sgte_mmc2): Cr3Si · A15 · cP8 · Pm-3n (223) — Hallstedt 2025 mmc2 row for CR3PT_A15: Cr4Pt
Candidate (tdb_comment): Cr3Si · cP8 · Pm-3n — CrPt-01Oik.tdb: 'Prototype Cr3Si (cP8, Pm-3n)'
Candidate (tdb_comment): Cr3Si · cP8 · Pm-3n — CrPt-09Pre.tdb: 'Prototype Cr3Si (cP8, Pm-3n)'
Candidate (tdb_comment): Cr3Si · cP8 · Pm-3n — CrPt-98Spe-LB.tdb: 'Prototype Cr3Si (cP8, Pm-3n)'
Stability: stable in 3 of 3 calculated diagram(s): 300–1904.94 K, x(Pt) 0.16476–0.25
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:cr-pt:cr3pt-a15
paper: paper:10.1016/j.msea.2008.10.059:A15, paper:10.1016/j.msea.2008.10.059:A15 Cr3Pt
tdb: tdb:CrPt-01Oik.tdb:CR3PT_A15, tdb:CrPt-09Pre.tdb:CR3PT_A15, tdb:CrPt-98Spe-LB.tdb:CR3PT_A15

TDB models of CR3PT_A15 (3): PHASE and CONSTITUENT statements as written

CrPt-01Oik.tdb: CR3PT_A15, type code %, sha256 e67e8c07062774a0…

41: PHASE CR3PT_A15 % 2 3 1 !
42: CONST CR3PT_A15 : CR% PT : CR PT% : !

CrPt-09Pre.tdb: CR3PT_A15, type code %, sha256 812667dfc13e00cf…

57: PHASE CR3PT_A15 % 2 3 1 !
58: CONST CR3PT_A15 : CR% PT : CR PT% : !

CrPt-98Spe-LB.tdb: CR3PT_A15, type code %, sha256 82886ea74acc67cb…

45: PHASE CR3PT_A15 % 2 4 1 !
46: CONST CR3PT_A15 : CR : PT : !

Example references (2 of 2; assessments first):

doi:10.1016/j.msea.2008.10.059 Johannes Preußner, Sara Prins, Rainer Völkl, Zi-Kui Liu, Uwe Glatzel, Determination of phases in the system chromium–platinum (Cr–Pt) and thermodynamic calculations, Materials Science and Engineering: A 510-511, 322-327 (2009).
assessment that models this phase; reports values for 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

CRPT3_L12 (Cr–Pt)

Id: phase:cr-pt:crpt3-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): 300–1421.05 K, x(Pt) 0.37505–0.84228
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:cr-pt:crpt3-l12
tdb: tdb:CrPt-98Spe-LB.tdb:CRPT3_L12

TDB models of CRPT3_L12 (1): PHASE and CONSTITUENT statements as written

CrPt-98Spe-LB.tdb: CRPT3_L12, type code %, sha256 82886ea74acc67cb…

50: PHASE CRPT3_L12 % 1 1 !
51: CONST CRPT3_L12 : CR PT : !

FCC_4SL (Cr–Pt)

Id: phase:cr-pt:fcc-4sl; status needs_review
No structure assigned. Why: order_disorder_ambiguity:CrPt-09Pre.tdb_model_is_partitioned; sgte_mmc2_row_disagrees_with_name:FCC_4SL; sgte_mmc2_rows_disagree; unrecognised_name_tokens:4SL
Candidate (dft_mp): Pm-3m (221) — on-hull MP CrPt3 at x(PT)=0.7500
Candidate (dft_oqmd): Pm-3m (221) — on-hull OQMD Cr1 Pt3 at x(PT)=0.7500
Candidate (literature_printed): AuCu · tP4 — printed with a label mapped to this phase
Candidate (name_token): Cu · A1 · cF4 · Fm-3m (225) — Strukturbericht/word 'A1' in the TDB name
Candidate (sgte_mmc2): AuCu · L1_0 · tP4 · P4/mmm (123) — Hallstedt 2025 mmc2 row for FCC_4SL: AlTi, AuCu, CoPt, CrPt, FeNi, FePt, MnNi
Candidate (sgte_mmc2): AuCu3 · L1_2 · cP4 · Pm-3m (221) — Hallstedt 2025 mmc2 row for FCC_4SL: Ag3Mg, Al3Li, AlNi3, AlPt3, Au3Cu, AuCu3, Co3Pt, CoPt3, Cr3Pt, CrPt3, Cu3Pt, FeNi3, Fe3Pt, FePt3, MnNi3, Ni3Pt, NiPt3, Ni3Si (beta-1)
Candidate (tdb_comment): AuCu · L1_0 · tP2, P4/mmm — CrPt-09Pre.tdb: 'Prototype AuCu (L1_0, tP2, P4/mmm) and AuCu3 (L1_2, cP4, Pm-3m)'
Stability: stable in 1 of 1 calculated diagram(s): 300–2050 K, x(Pt) 0.28697–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:cr-pt:fcc-4sl
paper: paper:10.1016/j.msea.2008.10.059:L10 CrPt, paper:10.1016/j.msea.2008.10.059:L12 Cr3Pt, paper:10.1016/j.msea.2008.10.059:L12 CrPt3
tdb: tdb:CrPt-09Pre.tdb:FCC_4SL

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

CrPt-09Pre.tdb: FCC_4SL, type code %AY, sha256 812667dfc13e00cf…

42: PHASE FCC_4SL:F %AY 5 0.25 0.25 0.25 0.25 1 !
43: CONST FCC_4SL:F : CR% PT : CR PT% : CR PT% : CR PT% : VA :  !

Example references (1 of 1; assessments first):

doi:10.1016/j.msea.2008.10.059 Johannes Preußner, Sara Prins, Rainer Völkl, Zi-Kui Liu, Uwe Glatzel, Determination of phases in the system chromium–platinum (Cr–Pt) and thermodynamic calculations, Materials Science and Engineering: A 510-511, 322-327 (2009).
assessment that models this phase; reports values for this phase

FCC_A1 (Cr–Pt)

Id: phase:cr-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): 300–2062.24 K, x(Pt) 0.28028–1
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:cr-pt:fcc-a1
paper: paper:10.1016/j.msea.2008.10.059:Pt fcc, paper:10.1016/j.msea.2008.10.059:fcc
tdb: tdb:CrPt-01Oik.tdb:FCC_A1, tdb:CrPt-09Pre.tdb:A1_FCC, tdb:CrPt-09Pre.tdb:FCC_A1, tdb:CrPt-98Spe-LB.tdb:FCC_A1

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

CrPt-01Oik.tdb: FCC_A1, type code %A, sha256 e67e8c07062774a0…

26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : CR PT% : VA : !

CrPt-09Pre.tdb: A1_FCC, type code %A, sha256 812667dfc13e00cf…

37: PHASE A1_FCC %A 2 1 1 !
38: CONST A1_FCC : CR PT% : VA : !

CrPt-09Pre.tdb: FCC_A1, type code %A, sha256 812667dfc13e00cf…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : CR PT% : VA : !

CrPt-98Spe-LB.tdb: FCC_A1, type code %A, sha256 82886ea74acc67cb…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : CR PT% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.msea.2008.10.059 Johannes Preußner, Sara Prins, Rainer Völkl, Zi-Kui Liu, Uwe Glatzel, Determination of phases in the system chromium–platinum (Cr–Pt) and thermodynamic calculations, Materials Science and Engineering: A 510-511, 322-327 (2009).
assessment that models this phase; reports values for 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 (Cr–Pt)

Id: phase:cr-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: not stable in 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:cr-pt:hcp-a3
tdb: tdb:CrPt-01Oik.tdb:HCP_A3, tdb:CrPt-09Pre.tdb:HCP_A3, tdb:CrPt-98Spe-LB.tdb:HCP_A3

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

CrPt-01Oik.tdb: HCP_A3, type code %A, sha256 e67e8c07062774a0…

36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : CR PT : VA : !

CrPt-09Pre.tdb: HCP_A3, type code %A, sha256 812667dfc13e00cf…

52: PHASE HCP_A3 %A 2 1 0.5 !
53: CONST HCP_A3 : CR PT : VA : !

CrPt-98Spe-LB.tdb: HCP_A3, type code %A, sha256 82886ea74acc67cb…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : CR PT : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.msea.2008.10.059 Johannes Preußner, Sara Prins, Rainer Völkl, Zi-Kui Liu, Uwe Glatzel, Determination of phases in the system chromium–platinum (Cr–Pt) and thermodynamic calculations, Materials Science and Engineering: A 510-511, 322-327 (2009).
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 (Cr–Pt)

Id: phase:cr-pt:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 1821.34–4000 K, x(Pt) 0–1
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:cr-pt:liquid
paper: paper:10.1016/j.msea.2008.10.059:L
tdb: tdb:CrPt-01Oik.tdb:LIQUID, tdb:CrPt-09Pre.tdb:LIQUID, tdb:CrPt-98Spe-LB.tdb:LIQUID

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

CrPt-01Oik.tdb: LIQUID, type code %, sha256 e67e8c07062774a0…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : CR PT : !

CrPt-09Pre.tdb: LIQUID, type code %, sha256 812667dfc13e00cf…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : CR PT : !

CrPt-98Spe-LB.tdb: LIQUID, type code %, sha256 82886ea74acc67cb…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : CR PT : !

Example references (2 of 2; assessments first):

doi:10.1016/j.msea.2008.10.059 Johannes Preußner, Sara Prins, Rainer Völkl, Zi-Kui Liu, Uwe Glatzel, Determination of phases in the system chromium–platinum (Cr–Pt) and thermodynamic calculations, Materials Science and Engineering: A 510-511, 322-327 (2009).
assessment that models this phase; reports values for 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}
}