Bi–La phases

11 phases (tier A 8, tier C 1, liquid 1, needs_review 1); 10 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 · Bi–La system page · Markdown · field reference

Phases of the Bi–La system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBOHEDRAL_A7 phase:bi-la:a7-rhombohedral	alpha-As · A7 · hR2 · R-3m (166)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–544.55 K, x(La) 0–0	0	2
BCC_A2 phase:bi-la:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1022.13–2499.37 K, x(La) 0.97813–1	0	2
BI2LA phase:bi-la:bi2la		needs_review	stable in 2 of 2 calculated diagram(s): 300–1209.91 K, x(La) 0.33333–0.33333	0	2
BI3LA4_D73 phase:bi-la:bi3la4-d73	Th3P4 · D7_3 · cI28 · I-43d (220)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1943.76 K, x(La) 0.57143–0.57143	0	2
BI3LA5_D88 phase:bi-la:bi3la5-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1620.04 K, x(La) 0.625–0.625	0	2
BILA_B1 phase:bi-la:bila-b1	NaCl · B1 · cF8 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1884.85 K, x(La) 0.5–0.5	0	2
BILA2 phase:bi-la:bila2	La2Sb · tI12 · I4/mmm (139)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1524.01 K, x(La) 0.66667–0.66667	0	2
DHCP phase:bi-la:dhcp-a3	alpha-La · A3' · hP4 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–550 K, x(La) 1–1	0	2
FCC_A1 phase:bi-la:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 550–1134 K, x(La) 1–1	0	2
HCP_A3 phase:bi-la:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
LIQUID phase:bi-la:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 544.51–2500 K, x(La) 0–1	3	2

RHOMBOHEDRAL_A7 (Bi–La)

Id: phase:bi-la:a7-rhombohedral; status assigned
Structure: alpha-As · A7 · hR2 · R-3m (166); type st:a7-alpha-as-hr2; tier A: standard phase name; confidence high
Stoichiometry: Bi 1.0000
Stability: stable in 2 of 2 calculated diagram(s): 300–544.55 K, x(La) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-la:a7-rhombohedral
tdb: tdb:BiLa-13Tan-ass.tdb:RHOMBOHEDRAL_A7, tdb:BiLa-13Tan.tdb:RHOMBOHEDRAL_A7

TDB models of RHOMBOHEDRAL_A7 (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: RHOMBOHEDRAL_A7, type code %, sha256 4dc0336198f36d73…

54: PHASE RHOMBOHEDRAL_A7 % 1 1 !
55: CONST RHOMBOHEDRAL_A7 : BI : !

BiLa-13Tan.tdb: RHOMBOHEDRAL_A7, type code %, sha256 45fbc62a11037c40…

50: PHASE RHOMBOHEDRAL_A7 % 1 1 !
51: CONST RHOMBOHEDRAL_A7 : BI : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase

BCC_A2 (Bi–La)

Id: phase:bi-la: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 2 of 2 calculated diagram(s): 1022.13–2499.37 K, x(La) 0.97813–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-la:bcc-a2
tdb: tdb:BiLa-13Tan-ass.tdb:BCC_A2, tdb:BiLa-13Tan.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: BCC_A2, type code %B, sha256 4dc0336198f36d73…

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

BiLa-13Tan.tdb: BCC_A2, type code %B, sha256 45fbc62a11037c40…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : BI LA% : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase

BI2LA (Bi–La)

Id: phase:bi-la:bi2la; status needs_review
No structure assigned. Why: no_on_hull_entry_in_mp; no_structure_token; sgte_mmc2_row_incomplete
Candidate (dft_oqmd): Cmcm (63) — on-hull OQMD Bi2 La1 at x(LA)=0.3333
Candidate (sgte_mmc2): (Bi2La) · oP12 — Hallstedt 2025 mmc2 row for BI2LA: Bi2La
Stoichiometry: Bi 0.6667, La 0.3333
Stability: stable in 2 of 2 calculated diagram(s): 300–1209.91 K, x(La) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-la:bi2la
tdb: tdb:BiLa-13Tan-ass.tdb:BI2LA, tdb:BiLa-13Tan.tdb:BI2LA

TDB models of BI2LA (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: BI2LA, type code %, sha256 4dc0336198f36d73…

59: PHASE BI2LA % 2 2 1 !
60: CONST BI2LA : BI : LA : !

BiLa-13Tan.tdb: BI2LA, type code %, sha256 45fbc62a11037c40…

55: PHASE BI2LA % 2 2 1 !
56: CONST BI2LA : BI : LA : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase

BI3LA4_D73 (Bi–La)

Id: phase:bi-la:bi3la4-d73; status assigned
Structure: Th3P4 · D7_3 · cI28 · I-43d (220); type st:d7-3-th3p4-ci28; tier A: standard phase name; confidence high
Stoichiometry: Bi 0.4286, La 0.5714
Stability: stable in 2 of 2 calculated diagram(s): 300–1943.76 K, x(La) 0.57143–0.57143
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-la:bi3la4-d73
tdb: tdb:BiLa-13Tan-ass.tdb:BI3LA4_D73, tdb:BiLa-13Tan.tdb:BI3LA4_D73

TDB models of BI3LA4_D73 (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: BI3LA4_D73, type code %, sha256 4dc0336198f36d73…

69: PHASE BI3LA4_D73 % 2 3 4 !
70: CONST BI3LA4_D73 : BI : LA : !

BiLa-13Tan.tdb: BI3LA4_D73, type code %, sha256 45fbc62a11037c40…

65: PHASE BI3LA4_D73 % 2 3 4 !
66: CONST BI3LA4_D73 : BI : LA : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase

BI3LA5_D88 (Bi–La)

Id: phase:bi-la:bi3la5-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
Stoichiometry: Bi 0.3750, La 0.6250
Stability: stable in 2 of 2 calculated diagram(s): 300–1620.04 K, x(La) 0.625–0.625
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-la:bi3la5-d88
tdb: tdb:BiLa-13Tan-ass.tdb:BI3LA5_D88, tdb:BiLa-13Tan.tdb:BI3LA5_D88

TDB models of BI3LA5_D88 (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: BI3LA5_D88, type code %, sha256 4dc0336198f36d73…

74: PHASE BI3LA5_D88 % 2 3 5 !
75: CONST BI3LA5_D88 : BI : LA : !

BiLa-13Tan.tdb: BI3LA5_D88, type code %, sha256 45fbc62a11037c40…

70: PHASE BI3LA5_D88 % 2 3 5 !
71: CONST BI3LA5_D88 : BI : LA : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase

BILA_B1 (Bi–La)

Id: phase:bi-la:bila-b1; status assigned
Structure: NaCl · B1 · cF8 · Fm-3m (225); type st:b1-nacl-cf8; tier A: standard phase name; confidence high
Stoichiometry: Bi 0.5000, La 0.5000
Stability: stable in 2 of 2 calculated diagram(s): 300–1884.85 K, x(La) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-la:bila-b1
tdb: tdb:BiLa-13Tan-ass.tdb:BILA_B1, tdb:BiLa-13Tan.tdb:BILA_B1

TDB models of BILA_B1 (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: BILA_B1, type code %, sha256 4dc0336198f36d73…

64: PHASE BILA_B1 % 2 1 1 !
65: CONST BILA_B1 : BI : LA : !

BiLa-13Tan.tdb: BILA_B1, type code %, sha256 45fbc62a11037c40…

60: PHASE BILA_B1 % 2 1 1 !
61: CONST BILA_B1 : BI : LA : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase

BILA2 (Bi–La)

Id: phase:bi-la:bila2; status assigned
Structure: La2Sb · tI12 · I4/mmm (139); type st:la2sb-ti12; 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_139_matches_7_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Bi 0.3333, La 0.6667
Stability: stable in 2 of 2 calculated diagram(s): 300–1524.01 K, x(La) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-la:bila2
tdb: tdb:BiLa-13Tan-ass.tdb:BILA2, tdb:BiLa-13Tan.tdb:BILA2

TDB models of BILA2 (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: BILA2, type code %, sha256 4dc0336198f36d73…

79: PHASE BILA2 % 2 1 2 !
80: CONST BILA2 : BI : LA : !

BiLa-13Tan.tdb: BILA2, type code %, sha256 45fbc62a11037c40…

75: PHASE BILA2 % 2 1 2 !
76: CONST BILA2 : BI : LA : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase

DHCP (Bi–La)

Id: phase:bi-la: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 2 of 2 calculated diagram(s): 300–550 K, x(La) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-la:dhcp-a3
tdb: tdb:BiLa-13Tan-ass.tdb:DHCP, tdb:BiLa-13Tan.tdb:DHCP

TDB models of DHCP (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: DHCP, type code %, sha256 4dc0336198f36d73…

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

BiLa-13Tan.tdb: DHCP, type code %, sha256 45fbc62a11037c40…

45: PHASE DHCP % 1 1 !
46: CONST DHCP : LA : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase

FCC_A1 (Bi–La)

Id: phase:bi-la: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 2 of 2 calculated diagram(s): 550–1134 K, x(La) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-la:fcc-a1
tdb: tdb:BiLa-13Tan-ass.tdb:FCC_A1, tdb:BiLa-13Tan.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: FCC_A1, type code %A, sha256 4dc0336198f36d73…

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

BiLa-13Tan.tdb: FCC_A1, type code %A, sha256 45fbc62a11037c40…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : BI LA% : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase

HCP_A3 (Bi–La)

Id: phase:bi-la: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: Bi 1.0000
Stability: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-la:hcp-a3
tdb: tdb:BiLa-13Tan-ass.tdb:HCP_A3, tdb:BiLa-13Tan.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: HCP_A3, type code %A, sha256 4dc0336198f36d73…

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

BiLa-13Tan.tdb: HCP_A3, type code %A, sha256 45fbc62a11037c40…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase

LIQUID (Bi–La)

Id: phase:bi-la:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 544.51–2500 K, x(La) 0–1
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-la:liquid
paper: paper:10.1007/s11669-013-0231-4:Liquid, paper:10.1007/s11669-013-0231-4:liquid
tdb: tdb:BiLa-13Tan-ass.tdb:LIQUID, tdb:BiLa-13Tan.tdb:LIQUID

TDB models of LIQUID (2): PHASE and CONSTITUENT statements as written

BiLa-13Tan-ass.tdb: LIQUID, type code %, sha256 4dc0336198f36d73…

29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : BI BI3LA4 LA : !

BiLa-13Tan.tdb: LIQUID, type code %, sha256 45fbc62a11037c40…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : BI LA : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-013-0231-4 Ying Tang, Biao Hu, Jiong Wang, Qiannan Gao, Yong Du, Xiaoming Yuan et al., Thermodynamic Modeling of the La-B and La-Bi Systems Supported by First-Principles Calculations, J. Phase Equilib. Diffus. 34, 297-306 (2013).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(77)90007-8 K Nomura, H Hayakawa, S Ono, The lanthanum-bismuth alloy system, Journal of the Less Common Metals 52, 259-269 (1977).
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}
}