Bi–Mg phases

8 phases (tier A 5, tier C 1, liquid 2); 6 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–Mg system page · Markdown · field reference

Phases of the Bi–Mg system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBOHEDRAL_A7 phase:bi-mg:a7-rhombohedral	alpha-As · A7 · hR2 · R-3m (166)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–544.55 K, x(Mg) 0–0	7	3
BCC_A2 phase:bi-mg:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
BI2MG3_BETA phase:bi-mg:bi2mg3-beta	Ag2S-beta · cI20 · Im-3m (229)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 3 of 3 calculated diagram(s): 960.97–1111.72 K, x(Mg) 0.60004–0.61257	17	3
BI2MG3_D52 phase:bi-mg:bi2mg3-d52	A-La2O3 · D5_2 · hP5 · P-3m1 (164)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–976.72 K, x(Mg) 0.6–0.65465	25	3
FCC_A1 phase:bi-mg:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
HCP_A3 phase:bi-mg:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–924 K, x(Mg) 0.98909–1	8	3
ION phase:bi-mg:ion	liquid	liquid	stable in 1 of 1 calculated diagram(s): 542.29–2500 K, x(Mg) 0–1	0	1
LIQUID phase:bi-mg:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 532.87–2500 K, x(Mg) 0–1	30	2

RHOMBOHEDRAL_A7 (Bi–Mg)

Id: phase:bi-mg: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 3 of 3 calculated diagram(s): 300–544.55 K, x(Mg) 0–0
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:bi-mg:a7-rhombohedral, corpus:phase:bi-mg:rhombohedral-a7
paper: paper:10.11890/1006-7191-121-19:Rhom
tdb: tdb:BiMg-12Niu.tdb:RHOMBOHEDRAL_A7, tdb:BiMg-14Zha.tdb:RHOMBOHEDRAL_A7, tdb:BiMg-92Oh-LB.tdb:RHOMBOHEDRAL_A7

TDB models of RHOMBOHEDRAL_A7 (3): PHASE and CONSTITUENT statements as written

BiMg-12Niu.tdb: RHOMBOHEDRAL_A7, type code %, sha256 d223b00da80d6852…

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

BiMg-14Zha.tdb: RHOMBOHEDRAL_A7, type code %, sha256 12f2cd6991a98668…

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

BiMg-92Oh-LB.tdb: RHOMBOHEDRAL_A7, type code %, sha256 cd58680284ba39f0…

52: PHASE RHOMBOHEDRAL_A7 % 1 1 !
53: CONST RHOMBOHEDRAL_A7 : BI : !

Example references (3 of 3; assessments first):

doi:10.11890/1006-7191-121-19 Acta Metall. Sin. Engl. Lett., 25, 19-28(2012).
assessment that models this phase; reports values for this phase
doi:10.1016/0364-5916(92)90006-J C.-S. Oh, S.-Y. Kang, D.N. Lee, Calphad, 16, 181-91(1992).
assessment that models this phase
doi:10.2298/JMMB130824017Z F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014).
assessment that models this phase

BCC_A2 (Bi–Mg)

Id: phase:bi-mg:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: not stable in 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:bi-mg:bcc-a2
tdb: tdb:BiMg-12Niu.tdb:BCC_A2, tdb:BiMg-14Zha.tdb:BCC_A2, tdb:BiMg-92Oh-LB.tdb:BCC_A2

TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written

BiMg-12Niu.tdb: BCC_A2, type code %B, sha256 d223b00da80d6852…

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

BiMg-14Zha.tdb: BCC_A2, type code %B, sha256 12f2cd6991a98668…

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

BiMg-92Oh-LB.tdb: BCC_A2, type code %B, sha256 cd58680284ba39f0…

42: PHASE BCC_A2 %B 2 1 3 !
43: CONST BCC_A2 : BI MG : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/0364-5916(92)90006-J C.-S. Oh, S.-Y. Kang, D.N. Lee, Calphad, 16, 181-91(1992).
assessment that models this phase
doi:10.11890/1006-7191-121-19 Acta Metall. Sin. Engl. Lett., 25, 19-28(2012).
assessment that models this phase
doi:10.2298/JMMB130824017Z F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014).
assessment that models this phase

BI2MG3_BETA (Bi–Mg)

Id: phase:bi-mg:bi2mg3-beta; status assigned
Structure: Ag2S-beta · cI20 · Im-3m (229); type st:ag2s-beta-ci20; 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, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 3 of 3 calculated diagram(s): 960.97–1111.72 K, x(Mg) 0.60004–0.61257
Literature: 17 values (17 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-mg:bi2mg3-beta
paper: paper:10.11890/1006-7191-121-19:β-Bi2Mg3
tdb: tdb:BiMg-12Niu.tdb:BI2MG3_BETA, tdb:BiMg-14Zha.tdb:BI2MG3_BETA, tdb:BiMg-92Oh-LB.tdb:BI2MG3_BETA

TDB models of BI2MG3_BETA (3): PHASE and CONSTITUENT statements as written

BiMg-12Niu.tdb: BI2MG3_BETA, type code %, sha256 d223b00da80d6852…

55: PHASE BI2MG3_BETA % 3 1 3 6 !
56: CONST BI2MG3_BETA : BI : BI VA : MG : !

BiMg-14Zha.tdb: BI2MG3_BETA, type code %, sha256 12f2cd6991a98668…

59: PHASE BI2MG3_BETA % 2 2 3 !
60: CONST BI2MG3_BETA : BI VA : MG : !

BiMg-92Oh-LB.tdb: BI2MG3_BETA, type code %, sha256 cd58680284ba39f0…

62: PHASE BI2MG3_BETA % 2 2 3 !
63: CONST BI2MG3_BETA : BI VA : MG : !

Example references (3 of 3; assessments first):

doi:10.11890/1006-7191-121-19 Acta Metall. Sin. Engl. Lett., 25, 19-28(2012).
assessment that models this phase; reports values for this phase
doi:10.1016/0364-5916(92)90006-J C.-S. Oh, S.-Y. Kang, D.N. Lee, Calphad, 16, 181-91(1992).
assessment that models this phase
doi:10.2298/JMMB130824017Z F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014).
assessment that models this phase

BI2MG3_D52 (Bi–Mg)

Id: phase:bi-mg:bi2mg3-d52; status assigned
Structure: A-La2O3 · D5_2 · hP5 · P-3m1 (164); type st:d5-2-a-la2o3-hp5; tier A: standard phase name; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 300–976.72 K, x(Mg) 0.6–0.65465
Literature: 25 values (25 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:bi-mg:bi2mg3-d52
paper: paper:10.11890/1006-7191-121-19:α-Bi2M3, paper:10.11890/1006-7191-121-19:α-Bi2Mg3
tdb: tdb:BiMg-12Niu.tdb:BI2MG3_D52, tdb:BiMg-14Zha.tdb:BI2MG3_D52, tdb:BiMg-92Oh-LB.tdb:BI2MG3_D52

TDB models of BI2MG3_D52 (3): PHASE and CONSTITUENT statements as written

BiMg-12Niu.tdb: BI2MG3_D52, type code %, sha256 d223b00da80d6852…

50: PHASE BI2MG3_D52 % 2 2 3 !
51: CONST BI2MG3_D52 : BI VA : MG : !

BiMg-14Zha.tdb: BI2MG3_D52, type code %, sha256 12f2cd6991a98668…

54: PHASE BI2MG3_D52 % 2 2 3 !
55: CONST BI2MG3_D52 : BI VA : MG : !

BiMg-92Oh-LB.tdb: BI2MG3_D52, type code %, sha256 cd58680284ba39f0…

57: PHASE BI2MG3_D52 % 2 2 3 !
58: CONST BI2MG3_D52 : BI VA : MG : !

Example references (3 of 3; assessments first):

doi:10.11890/1006-7191-121-19 Acta Metall. Sin. Engl. Lett., 25, 19-28(2012).
assessment that models this phase; reports values for this phase
doi:10.1016/0364-5916(92)90006-J C.-S. Oh, S.-Y. Kang, D.N. Lee, Calphad, 16, 181-91(1992).
assessment that models this phase
doi:10.2298/JMMB130824017Z F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014).
assessment that models this phase

FCC_A1 (Bi–Mg)

Id: phase:bi-mg: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 3 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:bi-mg:fcc-a1
tdb: tdb:BiMg-12Niu.tdb:FCC_A1, tdb:BiMg-14Zha.tdb:FCC_A1, tdb:BiMg-92Oh-LB.tdb:FCC_A1

TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written

BiMg-12Niu.tdb: FCC_A1, type code %A, sha256 d223b00da80d6852…

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

BiMg-14Zha.tdb: FCC_A1, type code %A, sha256 12f2cd6991a98668…

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

BiMg-92Oh-LB.tdb: FCC_A1, type code %A, sha256 cd58680284ba39f0…

37: PHASE FCC_A1 %A 2 1 1 !
38: CONST FCC_A1 : BI MG : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/0364-5916(92)90006-J C.-S. Oh, S.-Y. Kang, D.N. Lee, Calphad, 16, 181-91(1992).
assessment that models this phase
doi:10.11890/1006-7191-121-19 Acta Metall. Sin. Engl. Lett., 25, 19-28(2012).
assessment that models this phase
doi:10.2298/JMMB130824017Z F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014).
assessment that models this phase

HCP_A3 (Bi–Mg)

Id: phase:bi-mg: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 3 of 3 calculated diagram(s): 300–924 K, x(Mg) 0.98909–1
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-mg:hcp-a3
paper: paper:10.11890/1006-7191-121-19:hcp_A3
tdb: tdb:BiMg-12Niu.tdb:HCP_A3, tdb:BiMg-14Zha.tdb:HCP_A3, tdb:BiMg-92Oh-LB.tdb:HCP_A3

TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written

BiMg-12Niu.tdb: HCP_A3, type code %A, sha256 d223b00da80d6852…

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

BiMg-14Zha.tdb: HCP_A3, type code %A, sha256 12f2cd6991a98668…

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

BiMg-92Oh-LB.tdb: HCP_A3, type code %A, sha256 cd58680284ba39f0…

47: PHASE HCP_A3 %A 2 1 0.5 !
48: CONST HCP_A3 : BI MG% : VA : !

Example references (3 of 3; assessments first):

doi:10.11890/1006-7191-121-19 Acta Metall. Sin. Engl. Lett., 25, 19-28(2012).
assessment that models this phase; reports values for this phase
doi:10.1016/0364-5916(92)90006-J C.-S. Oh, S.-Y. Kang, D.N. Lee, Calphad, 16, 181-91(1992).
assessment that models this phase
doi:10.2298/JMMB130824017Z F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014).
assessment that models this phase

ION (Bi–Mg)

Id: phase:bi-mg:ion; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 542.29–2500 K, x(Mg) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:bi-mg:ion
tdb: tdb:BiMg-92Oh-LB.tdb:ION

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

BiMg-92Oh-LB.tdb: ION, type code %, sha256 cd58680284ba39f0…

32: PHASE ION:Y % 2 1 1 !
33: CONST ION:Y : MG+2 : BI-3 VA BI : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(92)90006-J C.-S. Oh, S.-Y. Kang, D.N. Lee, Calphad, 16, 181-91(1992).
assessment that models this phase

LIQUID (Bi–Mg)

Id: phase:bi-mg:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 532.87–2500 K, x(Mg) 0–1
Literature: 30 values (30 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:bi-mg:liquid
paper: paper:10.1016/0364-5916(92)90006-j:liquid, paper:10.11890/1006-7191-121-19:L
tdb: tdb:BiMg-12Niu.tdb:LIQUID, tdb:BiMg-14Zha.tdb:LIQUID

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

BiMg-12Niu.tdb: LIQUID, type code %, sha256 d223b00da80d6852…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : BI BI2MG3 MG : !

BiMg-14Zha.tdb: LIQUID, type code %, sha256 12f2cd6991a98668…

29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : BI BI2MG3 MG : !

Example references (3 of 3; assessments first):

doi:10.11890/1006-7191-121-19 Acta Metall. Sin. Engl. Lett., 25, 19-28(2012).
assessment that models this phase; reports values for this phase
doi:10.2298/JMMB130824017Z F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014).
assessment that models this phase
doi:10.1016/0364-5916(92)90006-j Oh Chang-Seok, Kang Soo-Young, Nyung Lee Dong, Assessment of the mg-bi system, Calphad 16, 181-191 (1992).
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}
}