Mg–Sb phases

8 phases (tier A 6, 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 · Mg–Sb system page · Markdown · field reference

Phases of the Mg–Sb system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBOHEDRAL_A7 phase:mg-sb:a7-rhombohedral	alpha-As · A7 · hR2 · R-3m (166)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–903.78 K, x(Sb) 1–1	6	3
BCC_A2 phase:mg-sb:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 3 calculated diagram(s)	0	3
FCC_A1 phase:mg-sb: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:mg-sb:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–926.98 K, x(Sb) 0–0.00071	6	3
ION phase:mg-sb:ion	liquid	liquid	stable in 1 of 1 calculated diagram(s): 851.75–2500 K, x(Sb) 0–1	2	1
LIQUID phase:mg-sb:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 853.07–2500 K, x(Sb) 0–1	12	2
MG3SB2_D52 phase:mg-sb:mg3sb2-d52	A-La2O3 · D5_2 · hP5 · P-3m1 (164)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1203.91 K, x(Sb) 0.37942–0.4	17	3
MG3SB2_D53 phase:mg-sb:mg3sb2-d53	Mn2O3 · D5_3 · cI80 · Ia-3 (206)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 1165.55–1583.07 K, x(Sb) 0.37561–0.39984	0	3

RHOMBOHEDRAL_A7 (Mg–Sb)

Id: phase:mg-sb: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: Sb 1.0000
Stability: stable in 3 of 3 calculated diagram(s): 300–903.78 K, x(Sb) 1–1
Literature: 6 values (6 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:mg-sb:a7-rhombohedral, corpus:phase:mg-sb:rhombohedral-a7
paper: paper:10.1007/bf02646653:α-Sb, paper:10.1016/j.calphad.2005.03.001:(Sb)
tdb: tdb:MgSb-05Bal.tdb:RHOMBOHEDRAL_A7, tdb:MgSb-21Zha.tdb:RHOMBOHEDRAL_A7, tdb:MgSb-87Jon.tdb:RHOMBOHEDRAL_A7

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

MgSb-05Bal.tdb: RHOMBOHEDRAL_A7, type code %, sha256 f1acf5dba3a7cdc8…

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

MgSb-21Zha.tdb: RHOMBOHEDRAL_A7, type code %, sha256 2dfe7cc47cfb6b8e…

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

MgSb-87Jon.tdb: RHOMBOHEDRAL_A7, type code %, sha256 9ad9f434fc7c389f…

53: PHASE RHOMBOHEDRAL_A7 % 1 1 !
54: CONST RHOMBOHEDRAL_A7 : SB : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2005.03.001 T. Balakumar, M. Medraj, Thermodynamic modeling of the Mg–Al–Sb system, Calphad 29, 24-36 (2005).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02646653 B. Joensson, J. Agren, Metall. Trans. A, 18A, 1395-1401(1987).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.calphad.2021.102361 J. Zhang, J. Wang, Y. Yuan, Calphad, 75, 102361(2021).
assessment that models this phase

BCC_A2 (Mg–Sb)

Id: phase:mg-sb: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:mg-sb:bcc-a2
tdb: tdb:MgSb-05Bal.tdb:BCC_A2, tdb:MgSb-21Zha.tdb:BCC_A2, tdb:MgSb-87Jon.tdb:BCC_A2

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

MgSb-05Bal.tdb: BCC_A2, type code %B, sha256 f1acf5dba3a7cdc8…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : MG SB : VA : !

MgSb-21Zha.tdb: BCC_A2, type code %B, sha256 2dfe7cc47cfb6b8e…

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

MgSb-87Jon.tdb: BCC_A2, type code %B, sha256 9ad9f434fc7c389f…

43: PHASE BCC_A2 %B 2 1 3 !
44: CONST BCC_A2 : MG SB : VA : !

Example references (3 of 3; assessments first):

doi:10.1007/BF02646653 B. Joensson, J. Agren, Metall. Trans. A, 18A, 1395-1401(1987).
assessment that models this phase
doi:10.1016/j.calphad.2005.03.001 T. Balakumar, M. Medraj, Thermodynamic modeling of the Mg–Al–Sb system, Calphad 29, 24-36 (2005).
assessment that models this phase
doi:10.1016/j.calphad.2021.102361 J. Zhang, J. Wang, Y. Yuan, Calphad, 75, 102361(2021).
assessment that models this phase

FCC_A1 (Mg–Sb)

Id: phase:mg-sb: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:mg-sb:fcc-a1
tdb: tdb:MgSb-05Bal.tdb:FCC_A1, tdb:MgSb-21Zha.tdb:FCC_A1, tdb:MgSb-87Jon.tdb:FCC_A1

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

MgSb-05Bal.tdb: FCC_A1, type code %A, sha256 f1acf5dba3a7cdc8…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : MG SB : VA : !

MgSb-21Zha.tdb: FCC_A1, type code %A, sha256 2dfe7cc47cfb6b8e…

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

MgSb-87Jon.tdb: FCC_A1, type code %A, sha256 9ad9f434fc7c389f…

38: PHASE FCC_A1 %A 2 1 1 !
39: CONST FCC_A1 : MG SB : VA : !

Example references (3 of 3; assessments first):

doi:10.1007/BF02646653 B. Joensson, J. Agren, Metall. Trans. A, 18A, 1395-1401(1987).
assessment that models this phase
doi:10.1016/j.calphad.2005.03.001 T. Balakumar, M. Medraj, Thermodynamic modeling of the Mg–Al–Sb system, Calphad 29, 24-36 (2005).
assessment that models this phase
doi:10.1016/j.calphad.2021.102361 J. Zhang, J. Wang, Y. Yuan, Calphad, 75, 102361(2021).
assessment that models this phase

HCP_A3 (Mg–Sb)

Id: phase:mg-sb: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): 300–926.98 K, x(Sb) 0–0.00071
Literature: 6 values (6 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:mg-sb:hcp-a3
paper: paper:10.1007/bf02646653:HCP, paper:10.1016/j.calphad.2005.03.001:(Mg)
tdb: tdb:MgSb-05Bal.tdb:HCP_A3, tdb:MgSb-21Zha.tdb:HCP_A3, tdb:MgSb-87Jon.tdb:HCP_A3

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

MgSb-05Bal.tdb: HCP_A3, type code %A, sha256 f1acf5dba3a7cdc8…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : MG% SB : VA : !

MgSb-21Zha.tdb: HCP_A3, type code %A, sha256 2dfe7cc47cfb6b8e…

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

MgSb-87Jon.tdb: HCP_A3, type code %A, sha256 9ad9f434fc7c389f…

48: PHASE HCP_A3 %A 2 1 0.5 !
49: CONST HCP_A3 : MG% SB : VA : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2005.03.001 T. Balakumar, M. Medraj, Thermodynamic modeling of the Mg–Al–Sb system, Calphad 29, 24-36 (2005).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02646653 B. Joensson, J. Agren, Metall. Trans. A, 18A, 1395-1401(1987).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.calphad.2021.102361 J. Zhang, J. Wang, Y. Yuan, Calphad, 75, 102361(2021).
assessment that models this phase

ION (Mg–Sb)

Id: phase:mg-sb:ion; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 851.75–2500 K, x(Sb) 0–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-sb:ion
paper: paper:10.1007/bf02646653:Liq
tdb: tdb:MgSb-87Jon.tdb:ION

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

MgSb-87Jon.tdb: ION, type code %, sha256 9ad9f434fc7c389f…

33: PHASE ION:Y % 2 1 1 !
34: CONST ION:Y : MG+2 : SB-3 VA SB : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02646653 B. Joensson, J. Agren, Metall. Trans. A, 18A, 1395-1401(1987).
assessment that models this phase; reports values for this phase

LIQUID (Mg–Sb)

Id: phase:mg-sb:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 853.07–2500 K, x(Sb) 0–1
Literature: 12 values (12 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:mg-sb:liquid
paper: paper:10.1007/bf02646653:Liq, paper:10.1016/j.calphad.2005.03.001:L
tdb: tdb:MgSb-05Bal.tdb:LIQUID, tdb:MgSb-21Zha.tdb:LIQUID

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

MgSb-05Bal.tdb: LIQUID, type code %, sha256 f1acf5dba3a7cdc8…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : MG SB : !

MgSb-21Zha.tdb: LIQUID, type code %, sha256 2dfe7cc47cfb6b8e…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : MG MG3SB2 SB : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2005.03.001 T. Balakumar, M. Medraj, Thermodynamic modeling of the Mg–Al–Sb system, Calphad 29, 24-36 (2005).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2021.102361 J. Zhang, J. Wang, Y. Yuan, Calphad, 75, 102361(2021).
assessment that models this phase
doi:10.1007/bf02646653 Björn Jönsson, John Ågren, A theoretical evaluation of chemical ordering and glass transition in liquid Mg-Sb alloys, Metall Trans A 18, 1395-1401 (1987).
cited as the source of values for this phase; reports values for this phase

MG3SB2_D52 (Mg–Sb)

Id: phase:mg-sb:mg3sb2-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): 300–1203.91 K, x(Sb) 0.37942–0.4
Literature: 17 values (17 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:mg-sb:mg3sb2-d52
paper: paper:10.1007/bf02646653:α, paper:10.1007/bf02646653:α*, paper:10.1016/j.calphad.2005.03.001:α-Mg3Sb2
tdb: tdb:MgSb-05Bal.tdb:MG3SB2_D52, tdb:MgSb-21Zha.tdb:MG3SB2_D52, tdb:MgSb-87Jon.tdb:MG3SB2_D52

TDB models of MG3SB2_D52 (3): PHASE and CONSTITUENT statements as written

MgSb-05Bal.tdb: MG3SB2_D52, type code %, sha256 f1acf5dba3a7cdc8…

51: PHASE MG3SB2_D52 % 2 3 2 !
52: CONST MG3SB2_D52 : MG : SB : !

MgSb-21Zha.tdb: MG3SB2_D52, type code %, sha256 2dfe7cc47cfb6b8e…

50: PHASE MG3SB2_D52 % 2 3 2 !
51: CONST MG3SB2_D52 : MG : SB% VA : !

MgSb-87Jon.tdb: MG3SB2_D52, type code %, sha256 9ad9f434fc7c389f…

58: PHASE MG3SB2_D52 % 2 3 2 !
59: CONST MG3SB2_D52 : MG : SB : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2005.03.001 T. Balakumar, M. Medraj, Thermodynamic modeling of the Mg–Al–Sb system, Calphad 29, 24-36 (2005).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02646653 B. Joensson, J. Agren, Metall. Trans. A, 18A, 1395-1401(1987).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.calphad.2021.102361 J. Zhang, J. Wang, Y. Yuan, Calphad, 75, 102361(2021).
assessment that models this phase

MG3SB2_D53 (Mg–Sb)

Id: phase:mg-sb:mg3sb2-d53; status assigned
Structure: Mn2O3 · D5_3 · cI80 · Ia-3 (206); type st:d5-3-mn2o3-ci80; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in MgSb-05Bal.tdb also describes the disordered state
Stability: stable in 3 of 3 calculated diagram(s): 1165.55–1583.07 K, x(Sb) 0.37561–0.39984
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mg-sb:mg3sb2-d53
tdb: tdb:MgSb-05Bal.tdb:MG3SB2_D53, tdb:MgSb-21Zha.tdb:MG3SB2_D53, tdb:MgSb-87Jon.tdb:MG3SB2_D53

TDB models of MG3SB2_D53 (3): PHASE and CONSTITUENT statements as written

MgSb-05Bal.tdb: MG3SB2_D53, type code %, sha256 f1acf5dba3a7cdc8…

56: PHASE MG3SB2_D53 % 3 4 5 1 !
57: CONST MG3SB2_D53 : MG SB% : MG% SB : MG : !

MgSb-21Zha.tdb: MG3SB2_D53, type code %, sha256 2dfe7cc47cfb6b8e…

55: PHASE MG3SB2_D53 % 3 6 3 1 !
56: CONST MG3SB2_D53 : MG : SB% VA : SB : !

MgSb-87Jon.tdb: MG3SB2_D53, type code %, sha256 9ad9f434fc7c389f…

63: PHASE MG3SB2_D53:I % 2 3 2 !
64: CONST MG3SB2_D53:I : MG+2 : SB-3 SB-5 VA : !

Example references (3 of 3; assessments first):

doi:10.1007/BF02646653 B. Joensson, J. Agren, Metall. Trans. A, 18A, 1395-1401(1987).
assessment that models this phase
doi:10.1016/j.calphad.2005.03.001 T. Balakumar, M. Medraj, Thermodynamic modeling of the Mg–Al–Sb system, Calphad 29, 24-36 (2005).
assessment that models this phase
doi:10.1016/j.calphad.2021.102361 J. Zhang, J. Wang, Y. Yuan, Calphad, 75, 102361(2021).
assessment that models 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}
}