La–Pb phases

12 phases (tier A 7, tier C 2, liquid 1, needs_review 2); 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–Pb system page · Markdown · field reference

Phases of the La–Pb system (12)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:la-pb:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1112.89–1202.89 K, x(Pb) 0–0.0133	1
DHCP phase:la-pb:dhcp-a3	alpha-La · A3' · hP4 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–762.49 K, x(Pb) 0–0	1
FCC_A1 phase:la-pb:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1134 K, x(Pb) 0–1	1
HCP_A3 phase:la-pb:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
LA3PB4_HT phase:la-pb:la3pb4-ht		needs_review	stable in 1 of 1 calculated diagram(s): 988.02–1457.71 K, x(Pb) 0.57143–0.57143	1
LA3PB4_LT phase:la-pb:la3pb4-lt		needs_review	stable in 1 of 1 calculated diagram(s): 300–988.02 K, x(Pb) 0.57143–0.57143	1
LA4PB3_D73 phase:la-pb:la4pb3-d73	Th3P4 · D7_3 · cI28 · I-43d (220)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1691.7 K, x(Pb) 0.42857–0.42857	1
LA5PB3_D88 phase:la-pb:la5pb3-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1726.13 K, x(Pb) 0.375–0.375	1
LA5PB4 phase:la-pb:la5pb4	Ge4Sm5 · oP36 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1623.75 K, x(Pb) 0.44444–0.44444	1
LAPB2 phase:la-pb:lapb2	CuZr2 · tI6 · I4/mmm (139)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1371.83 K, x(Pb) 0.66667–0.66667	1
LAPB3_L12 phase:la-pb:lapb3-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1436.97 K, x(Pb) 0.75–0.75	1
LIQUID phase:la-pb:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 588.3–2500 K, x(Pb) 0–1	1

BCC_A2 (La–Pb)

Id: phase:la-pb: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): 1112.89–1202.89 K, x(Pb) 0–0.0133
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:la-pb:bcc-a2
tdb: tdb:LaPb-09Idb.tdb:BCC_A2

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

LaPb-09Idb.tdb: BCC_A2, type code %B, sha256 ee98d00c51140961…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : LA% PB : VA : !

DHCP (La–Pb)

Id: phase:la-pb: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): 300–762.49 K, x(Pb) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:la-pb:dhcp-a3
tdb: tdb:LaPb-09Idb.tdb:DHCP

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

LaPb-09Idb.tdb: DHCP, type code %, sha256 ee98d00c51140961…

40: PHASE DHCP % 1 1 !
41: CONST DHCP : LA : !

FCC_A1 (La–Pb)

Id: phase:la-pb: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): 300–1134 K, x(Pb) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:la-pb:fcc-a1
tdb: tdb:LaPb-09Idb.tdb:FCC_A1

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

LaPb-09Idb.tdb: FCC_A1, type code %A, sha256 ee98d00c51140961…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : LA% PB% : VA : !

HCP_A3 (La–Pb)

Id: phase:la-pb: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: Pb 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-pb:hcp-a3
tdb: tdb:LaPb-09Idb.tdb:HCP_A3

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

LaPb-09Idb.tdb: HCP_A3, type code %A, sha256 ee98d00c51140961…

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

LA3PB4_HT (La–Pb)

Id: phase:la-pb:la3pb4-ht; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete
Candidate (dft_oqmd): Cmcm (63) — on-hull OQMD La3 Pb4 at x(PB)=0.5714
Candidate (sgte_mmc2): (La3Pb4-ht) — Hallstedt 2025 mmc2 row for LA3PB4_HT: La3Pb4 (high T)
Stoichiometry: La 0.4286, Pb 0.5714
Stability: stable in 1 of 1 calculated diagram(s): 988.02–1457.71 K, x(Pb) 0.57143–0.57143
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:la-pb:la3pb4-ht
tdb: tdb:LaPb-09Idb.tdb:LA3PB4_HT

TDB models of LA3PB4_HT (1): PHASE and CONSTITUENT statements as written

LaPb-09Idb.tdb: LA3PB4_HT, type code %, sha256 ee98d00c51140961…

65: PHASE LA3PB4_HT % 2 3 4 !
66: CONST LA3PB4_HT : LA : PB : !

LA3PB4_LT (La–Pb)

Id: phase:la-pb:la3pb4-lt; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete
Candidate (dft_oqmd): Cmcm (63) — on-hull OQMD La3 Pb4 at x(PB)=0.5714
Candidate (sgte_mmc2): (La3Pb4-lt) — Hallstedt 2025 mmc2 row for LA3PB4_LT: La3Pb4 (low T)
Stoichiometry: La 0.4286, Pb 0.5714
Stability: stable in 1 of 1 calculated diagram(s): 300–988.02 K, x(Pb) 0.57143–0.57143
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:la-pb:la3pb4-lt
tdb: tdb:LaPb-09Idb.tdb:LA3PB4_LT

TDB models of LA3PB4_LT (1): PHASE and CONSTITUENT statements as written

LaPb-09Idb.tdb: LA3PB4_LT, type code %, sha256 ee98d00c51140961…

60: PHASE LA3PB4_LT % 2 3 4 !
61: CONST LA3PB4_LT : LA : PB : !

LA4PB3_D73 (La–Pb)

Id: phase:la-pb:la4pb3-d73; status assigned
Structure: Th3P4 · D7_3 · cI28 · I-43d (220); type st:d7-3-th3p4-ci28; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaabgnem and oqmd-30655, space group 220
Stoichiometry: La 0.5714, Pb 0.4286
Stability: stable in 1 of 1 calculated diagram(s): 300–1691.7 K, x(Pb) 0.42857–0.42857
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:la-pb:la4pb3-d73
mp: mp:mp-aaabgnem
oqmd: oqmd:oqmd-30655
tdb: tdb:LaPb-09Idb.tdb:LA4PB3_D73

TDB models of LA4PB3_D73 (1): PHASE and CONSTITUENT statements as written

LaPb-09Idb.tdb: LA4PB3_D73, type code %, sha256 ee98d00c51140961…

50: PHASE LA4PB3_D73 % 2 4 3 !
51: CONST LA4PB3_D73 : LA : PB : !

LA5PB3_D88 (La–Pb)

Id: phase:la-pb:la5pb3-d88; status assigned
Structure: Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193); type st:d8-8-mn5si3-hp16; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaackxym and oqmd-31337, space group 193
Stoichiometry: La 0.6250, Pb 0.3750
Stability: stable in 1 of 1 calculated diagram(s): 300–1726.13 K, x(Pb) 0.375–0.375
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:la-pb:la5pb3-d88
mp: mp:mp-aaackxym
oqmd: oqmd:oqmd-31337
tdb: tdb:LaPb-09Idb.tdb:LA5PB3_D88

TDB models of LA5PB3_D88 (1): PHASE and CONSTITUENT statements as written

LaPb-09Idb.tdb: LA5PB3_D88, type code %, sha256 ee98d00c51140961…

45: PHASE LA5PB3_D88 % 2 5 3 !
46: CONST LA5PB3_D88 : LA : PB : !

LA5PB4 (La–Pb)

Id: phase:la-pb:la5pb4; status assigned
Structure: Ge4Sm5 · oP36 · Pnma (62); type st:ge4sm5-op36; 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 (dft_space_group_62_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: La 0.5556, Pb 0.4444
Stability: stable in 1 of 1 calculated diagram(s): 300–1623.75 K, x(Pb) 0.44444–0.44444
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:la-pb:la5pb4
tdb: tdb:LaPb-09Idb.tdb:LA5PB4

TDB models of LA5PB4 (1): PHASE and CONSTITUENT statements as written

LaPb-09Idb.tdb: LA5PB4, type code %, sha256 ee98d00c51140961…

55: PHASE LA5PB4 % 2 5 4 !
56: CONST LA5PB4 : LA : PB : !

LAPB2 (La–Pb)

Id: phase:la-pb:lapb2; status assigned
Structure: CuZr2 · tI6 · I4/mmm (139); type st:cuzr2-ti6; 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 0.3333, Pb 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1371.83 K, x(Pb) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:la-pb:lapb2
tdb: tdb:LaPb-09Idb.tdb:LAPB2

TDB models of LAPB2 (1): PHASE and CONSTITUENT statements as written

LaPb-09Idb.tdb: LAPB2, type code %, sha256 ee98d00c51140961…

70: PHASE LAPB2 % 2 1 2 !
71: CONST LAPB2 : LA : PB : !

LAPB3_L12 (La–Pb)

Id: phase:la-pb:lapb3-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaabfsi and oqmd-17568, space group 221
Stoichiometry: La 0.2500, Pb 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–1436.97 K, x(Pb) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:la-pb:lapb3-l12
mp: mp:mp-aaaabfsi
oqmd: oqmd:oqmd-17568
tdb: tdb:LaPb-09Idb.tdb:LAPB3_L12

TDB models of LAPB3_L12 (1): PHASE and CONSTITUENT statements as written

LaPb-09Idb.tdb: LAPB3_L12, type code %, sha256 ee98d00c51140961…

75: PHASE LAPB3_L12 % 2 1 3 !
76: CONST LAPB3_L12 : LA : PB : !

LIQUID (La–Pb)

Id: phase:la-pb:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 588.3–2500 K, x(Pb) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:la-pb:liquid
tdb: tdb:LaPb-09Idb.tdb:LIQUID

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

LaPb-09Idb.tdb: LIQUID, type code %, sha256 ee98d00c51140961…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : LA PB : !

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}
}