Bi–Tb phases

9 phases (tier A 7, 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 · Bi–Tb system page · Markdown · field reference

Phases of the Bi–Tb system (9)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBOHEDRAL_A7 phase:bi-tb:a7-rhombohedral	alpha-As · A7 · hR2 · R-3m (166)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–544.55 K, x(Tb) 0–0	2	1
BCC_A2 phase:bi-tb:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1539.58–1967 K, x(Tb) 0.99051–1	2	1
BI3TB4_D73 phase:bi-tb:bi3tb4-d73	Th3P4 · D7_3 · cI28 · I-43d (220)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1876.41 K, x(Tb) 0.57143–0.57143	4	1
BI3TB5_LT phase:bi-tb:bi3tb5	Bi3Y5 · oP32 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 316.83–1682.24 K, x(Tb) 0.625–0.625	4	1
BI3TB5_D88 phase:bi-tb:bi3tb5-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1682.24–1758.85 K, x(Tb) 0.625–0.625	4	1
BITB_B1 phase:bi-tb:bitb-b1	NaCl · B1 · cF8 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2032.88 K, x(Tb) 0.5–0.5	6	1
FCC_A1 phase:bi-tb:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
HCP_A3 phase:bi-tb:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1562 K, x(Tb) 0.99235–1	4	1
LIQUID phase:bi-tb:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 543.42–2500 K, x(Tb) 0–1	12	1

RHOMBOHEDRAL_A7 (Bi–Tb)

Id: phase:bi-tb: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
Stability: stable in 1 of 1 calculated diagram(s): 300–544.55 K, x(Tb) 0–0
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-tb:a7-rhombohedral
paper: paper:10.1007/s11669-011-9939-1:(Bi)
tdb: tdb:BiTb-11Wan.tdb:RHOMBOHEDRAL_A7

TDB models of RHOMBOHEDRAL_A7 (1): PHASE and CONSTITUENT statements as written

BiTb-11Wan.tdb: RHOMBOHEDRAL_A7, type code %, sha256 86634d657f268f1a…

45: PHASE RHOMBOHEDRAL_A7 % 1 1 !
46: CONST RHOMBOHEDRAL_A7 : BI% TB : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-011-9939-1 S. L. Wang, Z. B. Hu, F. Gao, C. P. Wang, X. J. Liu, Thermodynamic Assessments of the Bi-Tb and Bi-Y Systems, J. Phase Equilib. Diffus. 32, 441-446 (2011).
assessment that models this phase; reports values for this phase

BCC_A2 (Bi–Tb)

Id: phase:bi-tb: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): 1539.58–1967 K, x(Tb) 0.99051–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-tb:bcc-a2
paper: paper:10.1007/s11669-011-9939-1:βTb
tdb: tdb:BiTb-11Wan.tdb:BCC_A2

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

BiTb-11Wan.tdb: BCC_A2, type code %B, sha256 86634d657f268f1a…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11669-011-9939-1 S. L. Wang, Z. B. Hu, F. Gao, C. P. Wang, X. J. Liu, Thermodynamic Assessments of the Bi-Tb and Bi-Y Systems, J. Phase Equilib. Diffus. 32, 441-446 (2011).
assessment that models this phase; reports values for this phase

BI3TB4_D73 (Bi–Tb)

Id: phase:bi-tb:bi3tb4-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, Tb 0.5714
Stability: stable in 1 of 1 calculated diagram(s): 300–1876.41 K, x(Tb) 0.57143–0.57143
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-tb:bi3tb4-d73
paper: paper:10.1007/s11669-011-9939-1:Bi3Tb4
tdb: tdb:BiTb-11Wan.tdb:BI3TB4_D73

TDB models of BI3TB4_D73 (1): PHASE and CONSTITUENT statements as written

BiTb-11Wan.tdb: BI3TB4_D73, type code %, sha256 86634d657f268f1a…

55: PHASE BI3TB4_D73 % 2 3 4 !
56: CONST BI3TB4_D73 : BI : TB : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-011-9939-1 S. L. Wang, Z. B. Hu, F. Gao, C. P. Wang, X. J. Liu, Thermodynamic Assessments of the Bi-Tb and Bi-Y Systems, J. Phase Equilib. Diffus. 32, 441-446 (2011).
assessment that models this phase; reports values for this phase

BI3TB5_LT (Bi–Tb)

Id: phase:bi-tb:bi3tb5; status assigned
Structure: Bi3Y5 · oP32 · Pnma (62); type st:bi3y5-op32; 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, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Bi 0.3750, Tb 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 316.83–1682.24 K, x(Tb) 0.625–0.625
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-tb:bi3tb5
paper: paper:10.1007/s11669-011-9939-1:αBi3Tb5
tdb: tdb:BiTb-11Wan.tdb:BI3TB5_LT

TDB models of BI3TB5_LT (1): PHASE and CONSTITUENT statements as written

BiTb-11Wan.tdb: BI3TB5_LT, type code %, sha256 86634d657f268f1a…

60: PHASE BI3TB5_LT % 2 3 5 !
61: CONST BI3TB5_LT : BI : TB : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-011-9939-1 S. L. Wang, Z. B. Hu, F. Gao, C. P. Wang, X. J. Liu, Thermodynamic Assessments of the Bi-Tb and Bi-Y Systems, J. Phase Equilib. Diffus. 32, 441-446 (2011).
assessment that models this phase; reports values for this phase

BI3TB5_D88 (Bi–Tb)

Id: phase:bi-tb:bi3tb5-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, Tb 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 1682.24–1758.85 K, x(Tb) 0.625–0.625
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-tb:bi3tb5-d88
paper: paper:10.1007/s11669-011-9939-1:βBi3Tb5
tdb: tdb:BiTb-11Wan.tdb:BI3TB5_D88

TDB models of BI3TB5_D88 (1): PHASE and CONSTITUENT statements as written

BiTb-11Wan.tdb: BI3TB5_D88, type code %, sha256 86634d657f268f1a…

65: PHASE BI3TB5_D88 % 2 3 5 !
66: CONST BI3TB5_D88 : BI : TB : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-011-9939-1 S. L. Wang, Z. B. Hu, F. Gao, C. P. Wang, X. J. Liu, Thermodynamic Assessments of the Bi-Tb and Bi-Y Systems, J. Phase Equilib. Diffus. 32, 441-446 (2011).
assessment that models this phase; reports values for this phase

BITB_B1 (Bi–Tb)

Id: phase:bi-tb:bitb-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, Tb 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–2032.88 K, x(Tb) 0.5–0.5
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-tb:bitb-b1
paper: paper:10.1007/s11669-011-9939-1:BiTb
tdb: tdb:BiTb-11Wan.tdb:BITB_B1

TDB models of BITB_B1 (1): PHASE and CONSTITUENT statements as written

BiTb-11Wan.tdb: BITB_B1, type code %, sha256 86634d657f268f1a…

50: PHASE BITB_B1 % 2 1 1 !
51: CONST BITB_B1 : BI : TB : !

Example references (1 of 1; assessments first):

doi:10.1007/s11669-011-9939-1 S. L. Wang, Z. B. Hu, F. Gao, C. P. Wang, X. J. Liu, Thermodynamic Assessments of the Bi-Tb and Bi-Y Systems, J. Phase Equilib. Diffus. 32, 441-446 (2011).
assessment that models this phase; reports values for this phase

FCC_A1 (Bi–Tb)

Id: phase:bi-tb:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: Bi 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:bi-tb:fcc-a1
tdb: tdb:BiTb-11Wan.tdb:FCC_A1

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

BiTb-11Wan.tdb: FCC_A1, type code %A, sha256 86634d657f268f1a…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11669-011-9939-1 S. L. Wang, Z. B. Hu, F. Gao, C. P. Wang, X. J. Liu, Thermodynamic Assessments of the Bi-Tb and Bi-Y Systems, J. Phase Equilib. Diffus. 32, 441-446 (2011).
assessment that models this phase

HCP_A3 (Bi–Tb)

Id: phase:bi-tb: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): 300–1562 K, x(Tb) 0.99235–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-tb:hcp-a3
paper: paper:10.1007/s11669-011-9939-1:αTb
tdb: tdb:BiTb-11Wan.tdb:HCP_A3

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

BiTb-11Wan.tdb: HCP_A3, type code %A, sha256 86634d657f268f1a…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11669-011-9939-1 S. L. Wang, Z. B. Hu, F. Gao, C. P. Wang, X. J. Liu, Thermodynamic Assessments of the Bi-Tb and Bi-Y Systems, J. Phase Equilib. Diffus. 32, 441-446 (2011).
assessment that models this phase; reports values for this phase

LIQUID (Bi–Tb)

Id: phase:bi-tb:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 543.42–2500 K, x(Tb) 0–1
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-tb:liquid
paper: paper:10.1007/s11669-011-9939-1:L
tdb: tdb:BiTb-11Wan.tdb:LIQUID

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

BiTb-11Wan.tdb: LIQUID, type code %, sha256 86634d657f268f1a…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11669-011-9939-1 S. L. Wang, Z. B. Hu, F. Gao, C. P. Wang, X. J. Liu, Thermodynamic Assessments of the Bi-Tb and Bi-Y Systems, J. Phase Equilib. Diffus. 32, 441-446 (2011).
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}
}