Hg–Mg phases

11 phases (tier A 8, 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 · Hg–Mg system page · Markdown · field reference

Phases of the Hg–Mg system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
RHOMBO_A10 phase:hg-mg:a10-rhombo	alpha-Hg · A10 · hR1 · R-3m (166)	tier A: standard phase name	not stable in 1 calculated diagram(s)	3	1
BCC_A2 phase:hg-mg:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
FCC_A1 phase:hg-mg: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:hg-mg:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1258 K, x(Mg) 0.98164–1	4	1
HG2MG_C11B phase:hg-mg:hg2mg-c11b	MoSi2 · C11_b · tI6 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–441.1 K, x(Mg) 0.33333–0.33333	7	1
HG2MG5 phase:hg-mg:hg2mg5		needs_review	stable in 1 of 1 calculated diagram(s): 300–794.16 K, x(Mg) 0.71429–0.71429	6	1
HG3MG5_D88 phase:hg-mg:hg3mg5-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–834 K, x(Mg) 0.625–0.625	9	1
HGMG_B2 phase:hg-mg:hgmg-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–899.22 K, x(Mg) 0.5–0.5	11	1
HGMG2_C37 phase:hg-mg:hgmg2-c37	Co2Si · C37 · oP12 · Pnma (62)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–841.39 K, x(Mg) 0.66667–0.66667	10	1
HGMG3 phase:hg-mg:hgmg3	HgMg3 · hR24 · R32 (155)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–780.47 K, x(Mg) 0.75–0.75	7	1
LIQUID phase:hg-mg:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 300–2500 K, x(Mg) 0–1	34	1

RHOMBO_A10 (Hg–Mg)

Id: phase:hg-mg:a10-rhombo; status assigned
Structure: alpha-Hg · A10 · hR1 · R-3m (166); type st:a10-alpha-hg-hr1; tier A: standard phase name; confidence high
Stoichiometry: Hg 1.0000
Stability: not stable in 1 calculated diagram(s)
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:hg-mg:a10-rhombo, corpus:phase:hg-mg:rhombo-a10
paper: paper:10.1007/s11771-009-0005-7:Hg
tdb: tdb:HgMg-09Fen.tdb:RHOMBO_A10

TDB models of RHOMBO_A10 (1): PHASE and CONSTITUENT statements as written

HgMg-09Fen.tdb: RHOMBO_A10, type code %, sha256 ddfcb316b5d22cbe…

49: PHASE RHOMBO_A10 % 1 1 !
50: CONST RHOMBO_A10 : HG : !

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
assessment that models this phase; reports values for this phase

BCC_A2 (Hg–Mg)

Id: phase:hg-mg:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stoichiometry: Mg 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:hg-mg:bcc-a2
tdb: tdb:HgMg-09Fen.tdb:BCC_A2

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

HgMg-09Fen.tdb: BCC_A2, type code %B, sha256 ddfcb316b5d22cbe…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
assessment that models this phase

FCC_A1 (Hg–Mg)

Id: phase:hg-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 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hg-mg:fcc-a1
tdb: tdb:HgMg-09Fen.tdb:FCC_A1

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

HgMg-09Fen.tdb: FCC_A1, type code %A, sha256 ddfcb316b5d22cbe…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
assessment that models this phase

HCP_A3 (Hg–Mg)

Id: phase:hg-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 1 of 1 calculated diagram(s): 300–1258 K, x(Mg) 0.98164–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-mg:hcp-a3
paper: paper:10.1007/s11771-009-0005-7:(Mg)
tdb: tdb:HgMg-09Fen.tdb:HCP_A3

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

HgMg-09Fen.tdb: HCP_A3, type code %A, sha256 ddfcb316b5d22cbe…

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

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
assessment that models this phase; reports values for this phase

HG2MG_C11B (Hg–Mg)

Id: phase:hg-mg:hg2mg-c11b; status assigned
Structure: MoSi2 · C11_b · tI6 · I4/mmm (139); type st:c11-b-mosi2-ti6; tier A: standard phase name; confidence high
Stoichiometry: Hg 0.6667, Mg 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–441.1 K, x(Mg) 0.33333–0.33333
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-mg:hg2mg-c11b
paper: paper:10.1007/s11771-009-0005-7:MgHg2
tdb: tdb:HgMg-09Fen.tdb:HG2MG_C11B

TDB models of HG2MG_C11B (1): PHASE and CONSTITUENT statements as written

HgMg-09Fen.tdb: HG2MG_C11B, type code %, sha256 ddfcb316b5d22cbe…

54: PHASE HG2MG_C11B % 2 2 1 !
55: CONST HG2MG_C11B : HG : MG : !

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
assessment that models this phase; reports values for this phase

HG2MG5 (Hg–Mg)

Id: phase:hg-mg:hg2mg5; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): (Hg2Mg5) · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): (Hg2Mg5) — Hallstedt 2025 mmc2 row for HG2MG5: Hg2Mg5
Stoichiometry: Hg 0.2857, Mg 0.7143
Stability: stable in 1 of 1 calculated diagram(s): 300–794.16 K, x(Mg) 0.71429–0.71429
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-mg:hg2mg5
paper: paper:10.1007/s11771-009-0005-7:Mg5Hg2
tdb: tdb:HgMg-09Fen.tdb:HG2MG5

TDB models of HG2MG5 (1): PHASE and CONSTITUENT statements as written

HgMg-09Fen.tdb: HG2MG5, type code %, sha256 ddfcb316b5d22cbe…

74: PHASE HG2MG5 % 2 2 5 !
75: CONST HG2MG5 : HG : MG : !

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
assessment that models this phase; reports values for this phase

HG3MG5_D88 (Hg–Mg)

Id: phase:hg-mg:hg3mg5-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
Caveat: DFT agrees: on-hull mp-aaaaaqyz and oqmd-17412, space group 193
Stoichiometry: Hg 0.3750, Mg 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 300–834 K, x(Mg) 0.625–0.625
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:hg-mg:hg3mg5-d88
mp: mp:mp-aaaaaqyz
oqmd: oqmd:oqmd-17412
paper: paper:10.1007/s11771-009-0005-7:Mg5Hg3
tdb: tdb:HgMg-09Fen.tdb:HG3MG5_D88

TDB models of HG3MG5_D88 (1): PHASE and CONSTITUENT statements as written

HgMg-09Fen.tdb: HG3MG5_D88, type code %, sha256 ddfcb316b5d22cbe…

64: PHASE HG3MG5_D88 % 2 3 5 !
65: CONST HG3MG5_D88 : HG : MG : !

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
assessment that models this phase; reports values for this phase

HGMG_B2 (Hg–Mg)

Id: phase:hg-mg:hgmg-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Stoichiometry: Hg 0.5000, Mg 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–899.22 K, x(Mg) 0.5–0.5
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-mg:hgmg-b2
paper: paper:10.1007/s11771-009-0005-7:MgHg
tdb: tdb:HgMg-09Fen.tdb:HGMG_B2

TDB models of HGMG_B2 (1): PHASE and CONSTITUENT statements as written

HgMg-09Fen.tdb: HGMG_B2, type code %, sha256 ddfcb316b5d22cbe…

59: PHASE HGMG_B2 % 2 1 1 !
60: CONST HGMG_B2 : HG : MG : !

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
assessment that models this phase; reports values for this phase

HGMG2_C37 (Hg–Mg)

Id: phase:hg-mg:hgmg2-c37; status assigned
Structure: Co2Si · C37 · oP12 · Pnma (62); type st:c37-co2si-op12; tier A: standard phase name; confidence high
Stoichiometry: Hg 0.3333, Mg 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–841.39 K, x(Mg) 0.66667–0.66667
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-mg:hgmg2-c37
paper: paper:10.1007/s11771-009-0005-7:Mg2Hg
tdb: tdb:HgMg-09Fen.tdb:HGMG2_C37

TDB models of HGMG2_C37 (1): PHASE and CONSTITUENT statements as written

HgMg-09Fen.tdb: HGMG2_C37, type code %, sha256 ddfcb316b5d22cbe…

69: PHASE HGMG2_C37 % 2 1 2 !
70: CONST HGMG2_C37 : HG : MG : !

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
assessment that models this phase; reports values for this phase

HGMG3 (Hg–Mg)

Id: phase:hg-mg:hgmg3; status assigned
Structure: HgMg3 · hR24 · R32 (155); type st:hgmg3-hr24; 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_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Hg 0.2500, Mg 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–780.47 K, x(Mg) 0.75–0.75
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-mg:hgmg3
paper: paper:10.1007/s11771-009-0005-7:Mg3Hg
tdb: tdb:HgMg-09Fen.tdb:HGMG3

TDB models of HGMG3 (1): PHASE and CONSTITUENT statements as written

HgMg-09Fen.tdb: HGMG3, type code %, sha256 ddfcb316b5d22cbe…

79: PHASE HGMG3 % 2 1 3 !
80: CONST HGMG3 : HG : MG : !

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
assessment that models this phase; reports values for this phase

LIQUID (Hg–Mg)

Id: phase:hg-mg:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2500 K, x(Mg) 0–1
Literature: 34 values (34 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hg-mg:liquid
paper: paper:10.1007/s11771-009-0005-7:L
tdb: tdb:HgMg-09Fen.tdb:LIQUID

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

HgMg-09Fen.tdb: LIQUID, type code %, sha256 ddfcb316b5d22cbe…

29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : HG MG : !

Example references (1 of 1; assessments first):

doi:10.1007/s11771-009-0005-7 Yan Feng, Ri-chu Wang, Chao-qun Peng, Hua-shan Liu, Thermodynamic reassessment of Ga-Hg and Mg-Hg systems, J. Cent. South Univ. Technol. 16, 32-37 (2009).
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}
}