Bi–Gd phases

9 phases (tier A 6, tier C 1, liquid 1, needs_review 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–Gd system page · Markdown · field reference

Phases of the Bi–Gd system (9)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBOHEDRAL_A7 phase:bi-gd: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(Gd) 0–0	2	1
BCC_A2 phase:bi-gd:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1508.15–2499.4 K, x(Gd) 1–1	0	1
BI2GD phase:bi-gd:bi2gd		needs_review	stable in 1 of 1 calculated diagram(s): 300–1179.06 K, x(Gd) 0.33333–0.33333	4	1
BI3GD4_D73 phase:bi-gd:bi3gd4-d73	Th3P4 · D7_3 · cI28 · I-43d (220)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1852.34 K, x(Gd) 0.57143–0.57143	4	1
BI3GD5 phase:bi-gd:bi3gd5	Bi3Y5 · oP32 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1751.06 K, x(Gd) 0.625–0.625	4	1
BIGD_B1 phase:bi-gd:bigd-b1	NaCl · B1 · cF8 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2041.69 K, x(Gd) 0.5–0.5	6	1
FCC_A1 phase:bi-gd: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-gd:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1508.15 K, x(Gd) 1–1	2	1
LIQUID phase:bi-gd:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 540.71–2500 K, x(Gd) 0–1	18	1

RHOMBOHEDRAL_A7 (Bi–Gd)

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

Names (4): corpus: corpus:phase:bi-gd:a7-rhombohedral, corpus:phase:bi-gd:rhombohedral-a7
paper: paper:10.1016/j.calphad.2013.01.003:Rhomb_A7 (Bi)
tdb: tdb:BiGd-13Wan.tdb:RHOMBOHEDRAL_A7

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

BiGd-13Wan.tdb: RHOMBOHEDRAL_A7, type code %, sha256 deb2422aa42efa6f…

46: PHASE RHOMBOHEDRAL_A7 % 1 1 !
47: CONST RHOMBOHEDRAL_A7 : BI : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2013.01.003 Jinsan Wang, Changrong Li, Cuiping Guo, Zhenmin Du, Bo Wu, Thermodynamic assessment of the Gd–Bi and the Ho–Bi systems, Calphad 41, 1-5 (2013).
assessment that models this phase; reports values for this phase

BCC_A2 (Bi–Gd)

Id: phase:bi-gd: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): 1508.15–2499.4 K, x(Gd) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:bi-gd:bcc-a2
tdb: tdb:BiGd-13Wan.tdb:BCC_A2

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

BiGd-13Wan.tdb: BCC_A2, type code %B, sha256 deb2422aa42efa6f…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : BI GD% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2013.01.003 Jinsan Wang, Changrong Li, Cuiping Guo, Zhenmin Du, Bo Wu, Thermodynamic assessment of the Gd–Bi and the Ho–Bi systems, Calphad 41, 1-5 (2013).
assessment that models this phase

BI2GD (Bi–Gd)

Id: phase:bi-gd:bi2gd; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (Bi2Gd) · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): (Bi2Gd) — Hallstedt 2025 mmc2 row for BI2GD: Bi2Gd
Stoichiometry: Bi 0.6667, Gd 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1179.06 K, x(Gd) 0.33333–0.33333
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-gd:bi2gd
paper: paper:10.1016/j.calphad.2013.01.003:GdBi2
tdb: tdb:BiGd-13Wan.tdb:BI2GD

TDB models of BI2GD (1): PHASE and CONSTITUENT statements as written

BiGd-13Wan.tdb: BI2GD, type code %, sha256 deb2422aa42efa6f…

51: PHASE BI2GD % 2 2 1 !
52: CONST BI2GD : BI : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2013.01.003 Jinsan Wang, Changrong Li, Cuiping Guo, Zhenmin Du, Bo Wu, Thermodynamic assessment of the Gd–Bi and the Ho–Bi systems, Calphad 41, 1-5 (2013).
assessment that models this phase; reports values for this phase

BI3GD4_D73 (Bi–Gd)

Id: phase:bi-gd:bi3gd4-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, Gd 0.5714
Stability: stable in 1 of 1 calculated diagram(s): 300–1852.34 K, x(Gd) 0.57143–0.57143
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-gd:bi3gd4-d73
paper: paper:10.1016/j.calphad.2013.01.003:Gd4Bi3
tdb: tdb:BiGd-13Wan.tdb:BI3GD4_D73

TDB models of BI3GD4_D73 (1): PHASE and CONSTITUENT statements as written

BiGd-13Wan.tdb: BI3GD4_D73, type code %, sha256 deb2422aa42efa6f…

61: PHASE BI3GD4_D73 % 2 3 4 !
62: CONST BI3GD4_D73 : BI : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2013.01.003 Jinsan Wang, Changrong Li, Cuiping Guo, Zhenmin Du, Bo Wu, Thermodynamic assessment of the Gd–Bi and the Ho–Bi systems, Calphad 41, 1-5 (2013).
assessment that models this phase; reports values for this phase

BI3GD5 (Bi–Gd)

Id: phase:bi-gd:bi3gd5; 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_on_hull_entry_in_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Bi 0.3750, Gd 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 300–1751.06 K, x(Gd) 0.625–0.625
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-gd:bi3gd5
paper: paper:10.1016/j.calphad.2013.01.003:Gd5Bi3
tdb: tdb:BiGd-13Wan.tdb:BI3GD5

TDB models of BI3GD5 (1): PHASE and CONSTITUENT statements as written

BiGd-13Wan.tdb: BI3GD5, type code %, sha256 deb2422aa42efa6f…

66: PHASE BI3GD5 % 2 3 5 !
67: CONST BI3GD5 : BI : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2013.01.003 Jinsan Wang, Changrong Li, Cuiping Guo, Zhenmin Du, Bo Wu, Thermodynamic assessment of the Gd–Bi and the Ho–Bi systems, Calphad 41, 1-5 (2013).
assessment that models this phase; reports values for this phase

BIGD_B1 (Bi–Gd)

Id: phase:bi-gd:bigd-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, Gd 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–2041.69 K, x(Gd) 0.5–0.5
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-gd:bigd-b1
paper: paper:10.1016/j.calphad.2013.01.003:GdBi
tdb: tdb:BiGd-13Wan.tdb:BIGD_B1

TDB models of BIGD_B1 (1): PHASE and CONSTITUENT statements as written

BiGd-13Wan.tdb: BIGD_B1, type code %, sha256 deb2422aa42efa6f…

56: PHASE BIGD_B1 % 2 1 1 !
57: CONST BIGD_B1 : BI : GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2013.01.003 Jinsan Wang, Changrong Li, Cuiping Guo, Zhenmin Du, Bo Wu, Thermodynamic assessment of the Gd–Bi and the Ho–Bi systems, Calphad 41, 1-5 (2013).
assessment that models this phase; reports values for this phase

FCC_A1 (Bi–Gd)

Id: phase:bi-gd:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; 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:bi-gd:fcc-a1
tdb: tdb:BiGd-13Wan.tdb:FCC_A1

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

BiGd-13Wan.tdb: FCC_A1, type code %A, sha256 deb2422aa42efa6f…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2013.01.003 Jinsan Wang, Changrong Li, Cuiping Guo, Zhenmin Du, Bo Wu, Thermodynamic assessment of the Gd–Bi and the Ho–Bi systems, Calphad 41, 1-5 (2013).
assessment that models this phase

HCP_A3 (Bi–Gd)

Id: phase:bi-gd: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): 300–1508.15 K, x(Gd) 1–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:bi-gd:hcp-a3
paper: paper:10.1016/j.calphad.2013.01.003:Hcp_A3 (Gd)
tdb: tdb:BiGd-13Wan.tdb:HCP_A3

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

BiGd-13Wan.tdb: HCP_A3, type code %A, sha256 deb2422aa42efa6f…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2013.01.003 Jinsan Wang, Changrong Li, Cuiping Guo, Zhenmin Du, Bo Wu, Thermodynamic assessment of the Gd–Bi and the Ho–Bi systems, Calphad 41, 1-5 (2013).
assessment that models this phase; reports values for this phase

LIQUID (Bi–Gd)

Id: phase:bi-gd:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 540.71–2500 K, x(Gd) 0–1
Literature: 18 values (18 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:bi-gd:liquid
paper: paper:10.1016/j.calphad.2013.01.003:L, paper:10.1016/j.calphad.2013.01.003:Liquid
tdb: tdb:BiGd-13Wan.tdb:LIQUID

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

BiGd-13Wan.tdb: LIQUID, type code %, sha256 deb2422aa42efa6f…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : BI GD : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2013.01.003 Jinsan Wang, Changrong Li, Cuiping Guo, Zhenmin Du, Bo Wu, Thermodynamic assessment of the Gd–Bi and the Ho–Bi systems, Calphad 41, 1-5 (2013).
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}
}