La–Pt phases

12 phases (tier A 8, tier B 1, tier C 1, liquid 1, needs_review 1); 11 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 · La–Pt system page · Markdown · field reference

Phases of the La–Pt system (12)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:la-pt:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1134–1209 K, x(Pt) 0–0	0	1
DHCP phase:la-pt:dhcp-a3	alpha-La · A3' · hP4 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–550 K, x(Pt) 0–0	0	1
FCC_A1 phase:la-pt:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2499 K, x(Pt) 0–1	2	1
HCP_A3 phase:la-pt:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LA2PT7 phase:la-pt:la2pt7		needs_review	stable in 1 of 1 calculated diagram(s): 745.96–2350.25 K, x(Pt) 0.77778–0.77778	2	1
LA3PT2 phase:la-pt:la3pt2	Er3Ni2 · hR15 · R-3 (148)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 470.06–1319.6 K, x(Pt) 0.4–0.4	4	1
LA3PT4 phase:la-pt:la3pt4	Pd4Pu3 · hR14 · R-3 (148)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–1191.57 K, x(Pt) 0.57143–0.57143	2	1
LA7PT3_D102 phase:la-pt:la7pt3-d102	Fe3Th7 · D10_2 · hP20 · P6_3mc (186)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1167.63 K, x(Pt) 0.3–0.3	4	1
LAPT_B33 phase:la-pt:lapt-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1601.54 K, x(Pt) 0.5–0.5	6	1
LAPT2_C15 phase:la-pt:lapt2-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1761.23 K, x(Pt) 0.66667–0.7544	5	1
LAPT5_D2D phase:la-pt:lapt5-d2d	CaCu5 · D2_d · hP6 · P6/mmm (191)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2514.78 K, x(Pt) 0.83333–0.83333	3	1
LIQUID phase:la-pt:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1009.23–2514.78 K, x(Pt) 0–1	12	1

BCC_A2 (La–Pt)

Id: phase:la-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): 1134–1209 K, x(Pt) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:la-pt:bcc-a2
tdb: tdb:LaPt-06Rei.tdb:BCC_A2

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

LaPt-06Rei.tdb: BCC_A2, type code %B, sha256 2f34d1537e937633…

39: PHASE BCC_A2 %B 2 1 3 !
40: CONST BCC_A2 : LA% PT : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase

DHCP (La–Pt)

Id: phase:la-pt:dhcp-a3; status assigned
Structure: alpha-La · A3' · hP4 · P6_3/mmc (194); type st:a3-alpha-la-hp4; tier A: standard phase name; confidence high
Stoichiometry: La 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–550 K, x(Pt) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:la-pt:dhcp-a3
tdb: tdb:LaPt-06Rei.tdb:DHCP

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

LaPt-06Rei.tdb: DHCP, type code %, sha256 2f34d1537e937633…

49: PHASE DHCP % 1 1 !
50: CONST DHCP : LA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase

FCC_A1 (La–Pt)

Id: phase:la-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 K, x(Pt) 0–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:la-pt:fcc-a1
paper: paper:10.1016/j.jallcom.2005.10.016:(Pt)
tdb: tdb:LaPt-06Rei.tdb:FCC_A1

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

LaPt-06Rei.tdb: FCC_A1, type code %A, sha256 2f34d1537e937633…

34: PHASE FCC_A1 %A 2 1 1 !
35: CONST FCC_A1 : LA% PT% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase; reports values for this phase

HCP_A3 (La–Pt)

Id: phase:la-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
Stoichiometry: Pt 1.0000
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:la-pt:hcp-a3
tdb: tdb:LaPt-06Rei.tdb:HCP_A3

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

LaPt-06Rei.tdb: HCP_A3, type code %A, sha256 2f34d1537e937633…

44: PHASE HCP_A3 %A 2 1 0.5 !
45: CONST HCP_A3 : PT : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase

LA2PT7 (La–Pt)

Id: phase:la-pt:la2pt7; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (La2Pt7) · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): (La2Pt7) — Hallstedt 2025 mmc2 row for LA2PT7: La2Pt7
Stoichiometry: La 0.2222, Pt 0.7778
Stability: stable in 1 of 1 calculated diagram(s): 745.96–2350.25 K, x(Pt) 0.77778–0.77778
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:la-pt:la2pt7
paper: paper:10.1016/j.jallcom.2005.10.016:Pt7La2
tdb: tdb:LaPt-06Rei.tdb:LA2PT7

TDB models of LA2PT7 (1): PHASE and CONSTITUENT statements as written

LaPt-06Rei.tdb: LA2PT7, type code %, sha256 2f34d1537e937633…

79: PHASE LA2PT7 % 2 2 7 !
80: CONST LA2PT7 : LA : PT : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase; reports values for this phase

LA3PT2 (La–Pt)

Id: phase:la-pt:la3pt2; status assigned
Structure: Er3Ni2 · hR15 · R-3 (148); type st:er3ni2-hr15; 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_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: La 0.6000, Pt 0.4000
Stability: stable in 1 of 1 calculated diagram(s): 470.06–1319.6 K, x(Pt) 0.4–0.4
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:la-pt:la3pt2
paper: paper:10.1016/j.jallcom.2005.10.016:Pt2La3
tdb: tdb:LaPt-06Rei.tdb:LA3PT2

TDB models of LA3PT2 (1): PHASE and CONSTITUENT statements as written

LaPt-06Rei.tdb: LA3PT2, type code %, sha256 2f34d1537e937633…

59: PHASE LA3PT2 % 2 3 2 !
60: CONST LA3PT2 : LA : PT : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase; reports values for this phase

LA3PT4 (La–Pt)

Id: phase:la-pt:la3pt4; status assigned
Structure: Pd4Pu3 · hR14 · R-3 (148); type st:pd4pu3-hr14; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: La 0.4286, Pt 0.5714
Stability: stable in 1 of 1 calculated diagram(s): 300–1191.57 K, x(Pt) 0.57143–0.57143
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:la-pt:la3pt4
mp: mp:mp-aaackwkm
oqmd: oqmd:oqmd-2027663
paper: paper:10.1016/j.jallcom.2005.10.016:Pt4La3
tdb: tdb:LaPt-06Rei.tdb:LA3PT4

TDB models of LA3PT4 (1): PHASE and CONSTITUENT statements as written

LaPt-06Rei.tdb: LA3PT4, type code %, sha256 2f34d1537e937633…

69: PHASE LA3PT4 % 2 3 4 !
70: CONST LA3PT4 : LA : PT : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase; reports values for this phase

LA7PT3_D102 (La–Pt)

Id: phase:la-pt:la7pt3-d102; status assigned
Structure: Fe3Th7 · D10_2 · hP20 · P6_3mc (186); type st:d10-2-fe3th7-hp20; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacprqb and oqmd-1821163, space group 186
Stoichiometry: La 0.7000, Pt 0.3000
Stability: stable in 1 of 1 calculated diagram(s): 300–1167.63 K, x(Pt) 0.3–0.3
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:la-pt:la7pt3-d102
mp: mp:mp-aaacprqb
oqmd: oqmd:oqmd-1821163
paper: paper:10.1016/j.jallcom.2005.10.016:Pt3La7
tdb: tdb:LaPt-06Rei.tdb:LA7PT3_D102

TDB models of LA7PT3_D102 (1): PHASE and CONSTITUENT statements as written

LaPt-06Rei.tdb: LA7PT3_D102, type code %, sha256 2f34d1537e937633…

54: PHASE LA7PT3_D102 % 2 7 3 !
55: CONST LA7PT3_D102 : LA : PT : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase; reports values for this phase

LAPT_B33 (La–Pt)

Id: phase:la-pt:lapt-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacfakm and oqmd-30659, space group 63
Stoichiometry: La 0.5000, Pt 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1601.54 K, x(Pt) 0.5–0.5
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:la-pt:lapt-b33
mp: mp:mp-aaacfakm
oqmd: oqmd:oqmd-30659
paper: paper:10.1016/j.jallcom.2005.10.016:PtLa
tdb: tdb:LaPt-06Rei.tdb:LAPT_B33

TDB models of LAPT_B33 (1): PHASE and CONSTITUENT statements as written

LaPt-06Rei.tdb: LAPT_B33, type code %, sha256 2f34d1537e937633…

64: PHASE LAPT_B33 % 2 1 1 !
65: CONST LAPT_B33 : LA : PT : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase; reports values for this phase

LAPT2_C15 (La–Pt)

Id: phase:la-pt:lapt2-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1761.23 K, x(Pt) 0.66667–0.7544
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:la-pt:lapt2-c15
paper: paper:10.1016/j.jallcom.2005.10.016:Pt2La
tdb: tdb:LaPt-06Rei.tdb:LAPT2_C15

TDB models of LAPT2_C15 (1): PHASE and CONSTITUENT statements as written

LaPt-06Rei.tdb: LAPT2_C15, type code %, sha256 2f34d1537e937633…

74: PHASE LAPT2_C15 % 2 1 2 !
75: CONST LAPT2_C15 : LA% PT : PT : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase; reports values for this phase

LAPT5_D2D (La–Pt)

Id: phase:la-pt:lapt5-d2d; status assigned
Structure: CaCu5 · D2_d · hP6 · P6/mmm (191); type st:d2-d-cacu5-hp6; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaacsm and oqmd-17574, space group 191
Stoichiometry: La 0.1667, Pt 0.8333
Stability: stable in 1 of 1 calculated diagram(s): 300–2514.78 K, x(Pt) 0.83333–0.83333
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:la-pt:lapt5-d2d
mp: mp:mp-aaaaacsm
oqmd: oqmd:oqmd-17574
paper: paper:10.1016/j.jallcom.2005.10.016:Pt5La
tdb: tdb:LaPt-06Rei.tdb:LAPT5_D2D

TDB models of LAPT5_D2D (1): PHASE and CONSTITUENT statements as written

LaPt-06Rei.tdb: LAPT5_D2D, type code %, sha256 2f34d1537e937633…

84: PHASE LAPT5_D2D % 2 1 5 !
85: CONST LAPT5_D2D : LA : PT : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
assessment that models this phase; reports values for this phase

LIQUID (La–Pt)

Id: phase:la-pt:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1009.23–2514.78 K, x(Pt) 0–1
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:la-pt:liquid
paper: paper:10.1016/j.jallcom.2005.10.016:L
tdb: tdb:LaPt-06Rei.tdb:LIQUID

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

LaPt-06Rei.tdb: LIQUID, type code %, sha256 2f34d1537e937633…

29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : LA PT : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.10.016 S. Reimann, H.-J. Schaller, Constitution and thermodynamics of Pt–La alloys, Journal of Alloys and Compounds 419, 133-139 (2006).
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}
}