Mo–Pt phases

8 phases (tier A 6, tier C 1, liquid 1); 8 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 · Mo–Pt system page · Markdown · field reference

Phases of the Mo–Pt system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:mo-pt:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2900.01 K, x(Pt) 0–0.14368	12	1
FCC_A1 phase:mo-pt:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2296.51 K, x(Pt) 0.58668–1	6	1
HCP_A3 phase:mo-pt:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1738.7–2450 K, x(Pt) 0.32857–0.58024	12	1
LIQUID phase:mo-pt:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 2041.5–4000 K, x(Pt) 0–1	6	1
MO6PT_A15 phase:mo-pt:mo6pt-a15	Cr3Si · A15 · cP8 · Pm-3n (223)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1550–2060 K, x(Pt) 0.18326–0.18901	14	1
MOPT_B19 phase:mo-pt:mopt-b19	AuCd · B19 · oP4 · Pmma (51)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2320 K, x(Pt) 0.36–0.5065	15	1
MOPT_D019 phase:mo-pt:mopt-d019	Ni3Sn · D0_19 · hP8 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1260–2430 K, x(Pt) 0.3318–0.52577	12	1
MOPT2 phase:mo-pt:mopt2	MoPt2 · oI6 · Immm (71)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2210 K, x(Pt) 0.61354–0.99	31	1

BCC_A2 (Mo–Pt)

Id: phase:mo-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 1 of 1 calculated diagram(s): 300–2900.01 K, x(Pt) 0–0.14368
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mo-pt:bcc-a2
paper: paper:10.1016/j.calphad.2024.102665:A2
tdb: tdb:MoPt-24Fio.tdb:BCC_A2

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

MoPt-24Fio.tdb: BCC_A2, type code %B, sha256 e0c202c305972988…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : MO% PT : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2024.102665 J.-M. Fiorani, M. Siblani, J.-M. Joubert, C. Barreteau, J.-C. Crivello, N. David et al., Thermodynamic modeling of the Mo–Pt system based on the NACEF approach, Calphad 84, 102665 (2024).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02881200 L. Brewer, R.H. Lamoreaux, Bull. Alloy Phase Diagrams, 1 (1980) 89-91.
cited as the source of values for this phase

FCC_A1 (Mo–Pt)

Id: phase:mo-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 1 of 1 calculated diagram(s): 300–2296.51 K, x(Pt) 0.58668–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mo-pt:fcc-a1
paper: paper:10.1016/j.calphad.2024.102665:A1
tdb: tdb:MoPt-24Fio.tdb:FCC_A1

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

MoPt-24Fio.tdb: FCC_A1, type code %A, sha256 e0c202c305972988…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : MO PT% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2024.102665 J.-M. Fiorani, M. Siblani, J.-M. Joubert, C. Barreteau, J.-C. Crivello, N. David et al., Thermodynamic modeling of the Mo–Pt system based on the NACEF approach, Calphad 84, 102665 (2024).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02881200 L. Brewer, R.H. Lamoreaux, Bull. Alloy Phase Diagrams, 1 (1980) 89-91.
cited as the source of values for this phase

HCP_A3 (Mo–Pt)

Id: phase:mo-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 1 of 1 calculated diagram(s): 1738.7–2450 K, x(Pt) 0.32857–0.58024
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mo-pt:hcp-a3
paper: paper:10.1016/j.calphad.2024.102665:A3
tdb: tdb:MoPt-24Fio.tdb:HCP_A3

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

MoPt-24Fio.tdb: HCP_A3, type code %A, sha256 e0c202c305972988…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : MO PT : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2024.102665 J.-M. Fiorani, M. Siblani, J.-M. Joubert, C. Barreteau, J.-C. Crivello, N. David et al., Thermodynamic modeling of the Mo–Pt system based on the NACEF approach, Calphad 84, 102665 (2024).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02881200 L. Brewer, R.H. Lamoreaux, Bull. Alloy Phase Diagrams, 1 (1980) 89-91.
cited as the source of values for this phase

LIQUID (Mo–Pt)

Id: phase:mo-pt:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 2041.5–4000 K, x(Pt) 0–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mo-pt:liquid
paper: paper:10.1016/j.calphad.2024.102665:L
tdb: tdb:MoPt-24Fio.tdb:LIQUID

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

MoPt-24Fio.tdb: LIQUID, type code %, sha256 e0c202c305972988…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : MO PT : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2024.102665 J.-M. Fiorani, M. Siblani, J.-M. Joubert, C. Barreteau, J.-C. Crivello, N. David et al., Thermodynamic modeling of the Mo–Pt system based on the NACEF approach, Calphad 84, 102665 (2024).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02881200 L. Brewer, R.H. Lamoreaux, Bull. Alloy Phase Diagrams, 1 (1980) 89-91.
cited as the source of values for this phase

MO6PT_A15 (Mo–Pt)

Id: phase:mo-pt:mo6pt-a15; status assigned
Structure: Cr3Si · A15 · cP8 · Pm-3n (223); type st:a15-cr3si-cp8; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in MoPt-24Fio.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 1550–2060 K, x(Pt) 0.18326–0.18901
Literature: 14 values (14 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mo-pt:mo6pt-a15
paper: paper:10.1016/j.calphad.2024.102665:A15
tdb: tdb:MoPt-24Fio.tdb:MO6PT_A15

TDB models of MO6PT_A15 (1): PHASE and CONSTITUENT statements as written

MoPt-24Fio.tdb: MO6PT_A15, type code %, sha256 e0c202c305972988…

46: PHASE MO6PT_A15 % 2 3 1 !
47: CONST MO6PT_A15 : MO% PT : MO PT% : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2024.102665 J.-M. Fiorani, M. Siblani, J.-M. Joubert, C. Barreteau, J.-C. Crivello, N. David et al., Thermodynamic modeling of the Mo–Pt system based on the NACEF approach, Calphad 84, 102665 (2024).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02881200 L. Brewer, R.H. Lamoreaux, Bull. Alloy Phase Diagrams, 1 (1980) 89-91.
cited as the source of values for this phase

MOPT_B19 (Mo–Pt)

Id: phase:mo-pt:mopt-b19; status assigned
Structure: AuCd · B19 · oP4 · Pmma (51); type st:b19-aucd-op4; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in MoPt-24Fio.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–2320 K, x(Pt) 0.36–0.5065
Literature: 15 values (15 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mo-pt:mopt-b19
paper: paper:10.1016/j.calphad.2024.102665:B19
tdb: tdb:MoPt-24Fio.tdb:MOPT_B19

TDB models of MOPT_B19 (1): PHASE and CONSTITUENT statements as written

MoPt-24Fio.tdb: MOPT_B19, type code %, sha256 e0c202c305972988…

56: PHASE MOPT_B19 % 2 1 1 !
57: CONST MOPT_B19 : MO% PT : MO PT% : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2024.102665 J.-M. Fiorani, M. Siblani, J.-M. Joubert, C. Barreteau, J.-C. Crivello, N. David et al., Thermodynamic modeling of the Mo–Pt system based on the NACEF approach, Calphad 84, 102665 (2024).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02881200 L. Brewer, R.H. Lamoreaux, Bull. Alloy Phase Diagrams, 1 (1980) 89-91.
cited as the source of values for this phase
doi:10.1103/physrevb.50.5962 Z. W. Lu, Barry M. Klein, Theoretical studies of the stability of ordered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">A</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><i>B</i>compounds, Phys. Rev. B 50, 5962-5970 (1994).
cited as the source of values for this phase

MOPT_D019 (Mo–Pt)

Id: phase:mo-pt:mopt-d019; status assigned
Structure: Ni3Sn · D0_19 · hP8 · P6_3/mmc (194); type st:d0-19-ni3sn-hp8; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in MoPt-24Fio.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 1260–2430 K, x(Pt) 0.3318–0.52577
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mo-pt:mopt-d019
paper: paper:10.1016/j.calphad.2024.102665:D019
tdb: tdb:MoPt-24Fio.tdb:MOPT_D019

TDB models of MOPT_D019 (1): PHASE and CONSTITUENT statements as written

MoPt-24Fio.tdb: MOPT_D019, type code %, sha256 e0c202c305972988…

51: PHASE MOPT_D019 % 2 3 1 !
52: CONST MOPT_D019 : MO% PT : MO PT% : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2024.102665 J.-M. Fiorani, M. Siblani, J.-M. Joubert, C. Barreteau, J.-C. Crivello, N. David et al., Thermodynamic modeling of the Mo–Pt system based on the NACEF approach, Calphad 84, 102665 (2024).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02881200 L. Brewer, R.H. Lamoreaux, Bull. Alloy Phase Diagrams, 1 (1980) 89-91.
cited as the source of values for this phase

MOPT2 (Mo–Pt)

Id: phase:mo-pt:mopt2; status assigned
Structure: MoPt2 · oI6 · Immm (71); type st:mopt2-oi6; 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_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 300–2210 K, x(Pt) 0.61354–0.99
Literature: 31 values (31 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mo-pt:mopt2
paper: paper:10.1016/j.calphad.2024.102665:MoPt2
tdb: tdb:MoPt-24Fio.tdb:MOPT2

TDB models of MOPT2 (1): PHASE and CONSTITUENT statements as written

MoPt-24Fio.tdb: MOPT2, type code %, sha256 e0c202c305972988…

61: PHASE MOPT2 % 2 2 1 !
62: CONST MOPT2 : MO PT% : MO% PT : !

Example references (5 of 5; assessments first):

doi:10.1016/j.calphad.2024.102665 J.-M. Fiorani, M. Siblani, J.-M. Joubert, C. Barreteau, J.-C. Crivello, N. David et al., Thermodynamic modeling of the Mo–Pt system based on the NACEF approach, Calphad 84, 102665 (2024).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02881200 L. Brewer, R.H. Lamoreaux, Bull. Alloy Phase Diagrams, 1 (1980) 89-91.
cited as the source of values for this phase
doi:10.1016/j.calphad.2005.01.002 Stefano Curtarolo A, Accuracy of ab initio methods in predicting the crystal structures of metals: A review of 80 binary alloys, Calphad (2005).
cited as the source of values for this phase
doi:10.1103/physrevb.50.5962 Z. W. Lu, Barry M. Klein, Theoretical studies of the stability of ordered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">A</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><i>B</i>compounds, Phys. Rev. B 50, 5962-5970 (1994).
cited as the source of values for this phase
doi:10.1103/physrevb.77.193111 M. Stojković, V. Koteski, J. Belošević-Čavor, B. Cekić, D. Stojić, V. Ivanovski, Structure and electronic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Mo</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:mtext>Pt</mml:mtext></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>MoPt</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>MoPt</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>: First-principles calculations, Phys. Rev. B 77 (2008).
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}
}