Pb–Pt phases

7 phases (tier A 5, tier C 1, liquid 1); 5 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 · Pb–Pt system page · Markdown · field reference

Phases of the Pb–Pt system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:pb-pt:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
FCC_A1 phase:pb-pt:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2499.45 K, x(Pt) 0–1	4	1
HCP_A3 phase:pb-pt:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LIQUID phase:pb-pt:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 556.4–2500 K, x(Pt) 0–1	8	1
PB4PT phase:pb-pt:pb4pt	Pb4Pt · tP10 · P4/nbm (125)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–633.23 K, x(Pt) 0.2–0.2	4	1
PBPT_B81 phase:pb-pt:pbpt-b81	NiAs · B8_1 · hP4 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1064.51 K, x(Pt) 0.5–0.5	4	1
PBPT3_L12 phase:pb-pt:pbpt3-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1189.45 K, x(Pt) 0.75–0.75	4	1

BCC_A2 (Pb–Pt)

Id: phase:pb-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 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pb-pt:bcc-a2
tdb: tdb:PbPt-09Lon.tdb:BCC_A2

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

PbPt-09Lon.tdb: BCC_A2, type code %B, sha256 1c1ed1ff0d289a0a…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11669-009-9530-1 Z. H. Long, X. M. Tao, H. S. Liu, Z. P. Jin, First-Principle Calculation Assisted Thermodynamic Assessment of the Pt-Pb System, J. Phase Equilib. Diffus. 30, 318-322 (2009).
assessment that models this phase

FCC_A1 (Pb–Pt)

Id: phase:pb-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): 300–2499.45 K, x(Pt) 0–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:pb-pt:fcc-a1
paper: paper:10.1007/s11669-009-9530-1:fcc (Pb), paper:10.1007/s11669-009-9530-1:fcc (Pt)
tdb: tdb:PbPt-09Lon.tdb:FCC_A1

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

PbPt-09Lon.tdb: FCC_A1, type code %A, sha256 1c1ed1ff0d289a0a…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11669-009-9530-1 Z. H. Long, X. M. Tao, H. S. Liu, Z. P. Jin, First-Principle Calculation Assisted Thermodynamic Assessment of the Pt-Pb System, J. Phase Equilib. Diffus. 30, 318-322 (2009).
assessment that models this phase; reports values for this phase

HCP_A3 (Pb–Pt)

Id: phase:pb-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 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pb-pt:hcp-a3
tdb: tdb:PbPt-09Lon.tdb:HCP_A3

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

PbPt-09Lon.tdb: HCP_A3, type code %A, sha256 1c1ed1ff0d289a0a…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11669-009-9530-1 Z. H. Long, X. M. Tao, H. S. Liu, Z. P. Jin, First-Principle Calculation Assisted Thermodynamic Assessment of the Pt-Pb System, J. Phase Equilib. Diffus. 30, 318-322 (2009).
assessment that models this phase

LIQUID (Pb–Pt)

Id: phase:pb-pt:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 556.4–2500 K, x(Pt) 0–1
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pb-pt:liquid
paper: paper:10.1007/s11669-009-9530-1:L
tdb: tdb:PbPt-09Lon.tdb:LIQUID

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

PbPt-09Lon.tdb: LIQUID, type code %, sha256 1c1ed1ff0d289a0a…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11669-009-9530-1 Z. H. Long, X. M. Tao, H. S. Liu, Z. P. Jin, First-Principle Calculation Assisted Thermodynamic Assessment of the Pt-Pb System, J. Phase Equilib. Diffus. 30, 318-322 (2009).
assessment that models this phase; reports values for this phase

PB4PT (Pb–Pt)

Id: phase:pb-pt:pb4pt; status assigned
Structure: Pb4Pt · tP10 · P4/nbm (125); type st:pb4pt-tp10; 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 (mp_oqmd_space_groups_differ, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Pb 0.8000, Pt 0.2000
Stability: stable in 1 of 1 calculated diagram(s): 300–633.23 K, x(Pt) 0.2–0.2
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pb-pt:pb4pt
paper: paper:10.1007/s11669-009-9530-1:PtPb4
tdb: tdb:PbPt-09Lon.tdb:PB4PT

TDB models of PB4PT (1): PHASE and CONSTITUENT statements as written

PbPt-09Lon.tdb: PB4PT, type code %, sha256 1c1ed1ff0d289a0a…

41: PHASE PB4PT % 2 4 1 !
42: CONST PB4PT : PB : PT : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-009-9530-1 Z. H. Long, X. M. Tao, H. S. Liu, Z. P. Jin, First-Principle Calculation Assisted Thermodynamic Assessment of the Pt-Pb System, J. Phase Equilib. Diffus. 30, 318-322 (2009).
assessment that models this phase; reports values for this phase

PBPT_B81 (Pb–Pt)

Id: phase:pb-pt:pbpt-b81; status assigned
Structure: NiAs · B8_1 · hP4 · P6_3/mmc (194); type st:b8-1-nias-hp4; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacirio and oqmd-2013509, space group 194
Stoichiometry: Pb 0.5000, Pt 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1064.51 K, x(Pt) 0.5–0.5
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:pb-pt:pbpt-b81
mp: mp:mp-aaacirio
oqmd: oqmd:oqmd-2013509
paper: paper:10.1007/s11669-009-9530-1:PtPb
tdb: tdb:PbPt-09Lon.tdb:PBPT_B81

TDB models of PBPT_B81 (1): PHASE and CONSTITUENT statements as written

PbPt-09Lon.tdb: PBPT_B81, type code %, sha256 1c1ed1ff0d289a0a…

46: PHASE PBPT_B81 % 2 1 1 !
47: CONST PBPT_B81 : PB : PT : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-009-9530-1 Z. H. Long, X. M. Tao, H. S. Liu, Z. P. Jin, First-Principle Calculation Assisted Thermodynamic Assessment of the Pt-Pb System, J. Phase Equilib. Diffus. 30, 318-322 (2009).
assessment that models this phase; reports values for this phase

PBPT3_L12 (Pb–Pt)

Id: phase:pb-pt:pbpt3-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Stoichiometry: Pb 0.2500, Pt 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–1189.45 K, x(Pt) 0.75–0.75
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pb-pt:pbpt3-l12
paper: paper:10.1007/s11669-009-9530-1:Pt3Pb
tdb: tdb:PbPt-09Lon.tdb:PBPT3_L12

TDB models of PBPT3_L12 (1): PHASE and CONSTITUENT statements as written

PbPt-09Lon.tdb: PBPT3_L12, type code %, sha256 1c1ed1ff0d289a0a…

51: PHASE PBPT3_L12 % 2 1 3 !
52: CONST PBPT3_L12 : PB : PT : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-009-9530-1 Z. H. Long, X. M. Tao, H. S. Liu, Z. P. Jin, First-Principle Calculation Assisted Thermodynamic Assessment of the Pt-Pb System, J. Phase Equilib. Diffus. 30, 318-322 (2009).
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}
}