Ge–Mg phases

6 phases (tier A 5, liquid 1); 4 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 · Ge–Mg system page · Markdown · field reference

Phases of the Ge–Mg system (6)
Phase	Structure	Basis	Stability (calculated)	TDB models
DIAMOND_A4 phase:ge-mg:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1211.4 K, x(Mg) 0–0	3
BCC_A2 phase:ge-mg:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 3 calculated diagram(s)	3
FCC_A1 phase:ge-mg:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 3 calculated diagram(s)	3
GEMG2_C1 phase:ge-mg:gemg2-c1	CaF2 · C1 · cF12 · Fm-3m (225)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–1390.96 K, x(Mg) 0.66667–0.66667	3
HCP_A3 phase:ge-mg:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 3 of 3 calculated diagram(s): 300–2499.89 K, x(Mg) 1–1	3
LIQUID phase:ge-mg:liquid	liquid	liquid	stable in 3 of 3 calculated diagram(s): 903.71–2500 K, x(Mg) 0–1	3

DIAMOND_A4 (Ge–Mg)

Id: phase:ge-mg:a4-diamond; status assigned
Structure: C (diamond) · A4 · cF8 · Fd-3m (227); type st:a4-c-diamond-cf8; tier A: standard phase name; confidence high
Stoichiometry: Ge 1.0000
Stability: stable in 3 of 3 calculated diagram(s): 300–1211.4 K, x(Mg) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ge-mg:a4-diamond
tdb: tdb:GeMg-06Isl.tdb:DIAMOND_A4, tdb:GeMg-10Yan-1.tdb:DIAMOND_A4, tdb:GeMg-10Yan-2.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (3): PHASE and CONSTITUENT statements as written

GeMg-06Isl.tdb: DIAMOND_A4, type code %, sha256 8081df690d59d028…

42: PHASE DIAMOND_A4 % 1 1 !
43: CONST DIAMOND_A4 : GE : !

GeMg-10Yan-1.tdb: DIAMOND_A4, type code %, sha256 22c07581734a5757…

47: PHASE DIAMOND_A4 % 1 1 !
48: CONST DIAMOND_A4 : GE : !

GeMg-10Yan-2.tdb: DIAMOND_A4, type code %, sha256 12570a7d080460a4…

49: PHASE DIAMOND_A4 % 1 1 !
50: CONST DIAMOND_A4 : GE : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.01.050 F. Islam, A.K. Thykadavil, M. Medraj, A computational thermodynamic model of the Mg–Al–Ge system, Journal of Alloys and Compounds 425, 129-139 (2006).
assessment that models this phase
doi:10.3139/146.110436 H. Yan, Y. Du, L. Zhou, H. Xu, L. Zhang, S. Liu, Int. J. Mater. Res., 101, 1489-96(2010).
assessment that models this phase

BCC_A2 (Ge–Mg)

Id: phase:ge-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:ge-mg:bcc-a2
tdb: tdb:GeMg-06Isl.tdb:BCC_A2, tdb:GeMg-10Yan-1.tdb:BCC_A2, tdb:GeMg-10Yan-2.tdb:BCC_A2

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

GeMg-06Isl.tdb: BCC_A2, type code %B, sha256 8081df690d59d028…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : GE MG : VA : !

GeMg-10Yan-1.tdb: BCC_A2, type code %B, sha256 22c07581734a5757…

37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : GE MG : VA : !

GeMg-10Yan-2.tdb: BCC_A2, type code %B, sha256 12570a7d080460a4…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.01.050 F. Islam, A.K. Thykadavil, M. Medraj, A computational thermodynamic model of the Mg–Al–Ge system, Journal of Alloys and Compounds 425, 129-139 (2006).
assessment that models this phase
doi:10.3139/146.110436 H. Yan, Y. Du, L. Zhou, H. Xu, L. Zhang, S. Liu, Int. J. Mater. Res., 101, 1489-96(2010).
assessment that models this phase

FCC_A1 (Ge–Mg)

Id: phase:ge-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:ge-mg:fcc-a1
tdb: tdb:GeMg-06Isl.tdb:FCC_A1, tdb:GeMg-10Yan-1.tdb:FCC_A1, tdb:GeMg-10Yan-2.tdb:FCC_A1

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

GeMg-06Isl.tdb: FCC_A1, type code %A, sha256 8081df690d59d028…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : GE MG : VA : !

GeMg-10Yan-1.tdb: FCC_A1, type code %A, sha256 22c07581734a5757…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : GE MG : VA : !

GeMg-10Yan-2.tdb: FCC_A1, type code %A, sha256 12570a7d080460a4…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.01.050 F. Islam, A.K. Thykadavil, M. Medraj, A computational thermodynamic model of the Mg–Al–Ge system, Journal of Alloys and Compounds 425, 129-139 (2006).
assessment that models this phase
doi:10.3139/146.110436 H. Yan, Y. Du, L. Zhou, H. Xu, L. Zhang, S. Liu, Int. J. Mater. Res., 101, 1489-96(2010).
assessment that models this phase

GEMG2_C1 (Ge–Mg)

Id: phase:ge-mg:gemg2-c1; status assigned
Structure: CaF2 · C1 · cF12 · Fm-3m (225); type st:c1-caf2-cf12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaaps and oqmd-646873, space group 225
Stoichiometry: Ge 0.3333, Mg 0.6667
Stability: stable in 3 of 3 calculated diagram(s): 300–1390.96 K, x(Mg) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:ge-mg:gemg2-c1
mp: mp:mp-aaaaaaps
oqmd: oqmd:oqmd-646873
tdb: tdb:GeMg-06Isl.tdb:GEMG2_C1, tdb:GeMg-10Yan-1.tdb:GEMG2_C1, tdb:GeMg-10Yan-2.tdb:GEMG2_C1

TDB models of GEMG2_C1 (3): PHASE and CONSTITUENT statements as written

GeMg-06Isl.tdb: GEMG2_C1, type code %, sha256 8081df690d59d028…

47: PHASE GEMG2_C1 % 2 1 2 !
48: CONST GEMG2_C1 : GE : MG : !

GeMg-10Yan-1.tdb: GEMG2_C1, type code %, sha256 22c07581734a5757…

52: PHASE GEMG2_C1 % 2 1 2 !
53: CONST GEMG2_C1 : GE : MG : !

GeMg-10Yan-2.tdb: GEMG2_C1, type code %, sha256 12570a7d080460a4…

54: PHASE GEMG2_C1 % 2 1 2 !
55: CONST GEMG2_C1 : GE : MG : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.01.050 F. Islam, A.K. Thykadavil, M. Medraj, A computational thermodynamic model of the Mg–Al–Ge system, Journal of Alloys and Compounds 425, 129-139 (2006).
assessment that models this phase
doi:10.3139/146.110436 H. Yan, Y. Du, L. Zhou, H. Xu, L. Zhang, S. Liu, Int. J. Mater. Res., 101, 1489-96(2010).
assessment that models this phase

HCP_A3 (Ge–Mg)

Id: phase:ge-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): 300–2499.89 K, x(Mg) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ge-mg:hcp-a3
tdb: tdb:GeMg-06Isl.tdb:HCP_A3, tdb:GeMg-10Yan-1.tdb:HCP_A3, tdb:GeMg-10Yan-2.tdb:HCP_A3

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

GeMg-06Isl.tdb: HCP_A3, type code %, sha256 8081df690d59d028…

37: PHASE HCP_A3 % 2 1 0.5 !
38: CONST HCP_A3 : GE MG% : VA : !

GeMg-10Yan-1.tdb: HCP_A3, type code %A, sha256 22c07581734a5757…

42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : GE MG% : VA : !

GeMg-10Yan-2.tdb: HCP_A3, type code %A, sha256 12570a7d080460a4…

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

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.01.050 F. Islam, A.K. Thykadavil, M. Medraj, A computational thermodynamic model of the Mg–Al–Ge system, Journal of Alloys and Compounds 425, 129-139 (2006).
assessment that models this phase
doi:10.3139/146.110436 H. Yan, Y. Du, L. Zhou, H. Xu, L. Zhang, S. Liu, Int. J. Mater. Res., 101, 1489-96(2010).
assessment that models this phase

LIQUID (Ge–Mg)

Id: phase:ge-mg:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 3 of 3 calculated diagram(s): 903.71–2500 K, x(Mg) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ge-mg:liquid
tdb: tdb:GeMg-06Isl.tdb:LIQUID, tdb:GeMg-10Yan-1.tdb:LIQUID, tdb:GeMg-10Yan-2.tdb:LIQUID

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

GeMg-06Isl.tdb: LIQUID, type code %, sha256 8081df690d59d028…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : GE MG : !

GeMg-10Yan-1.tdb: LIQUID, type code %, sha256 22c07581734a5757…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : GE MG : !

GeMg-10Yan-2.tdb: LIQUID, type code %, sha256 12570a7d080460a4…

29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : GE GEMG2 MG : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2006.01.050 F. Islam, A.K. Thykadavil, M. Medraj, A computational thermodynamic model of the Mg–Al–Ge system, Journal of Alloys and Compounds 425, 129-139 (2006).
assessment that models this phase
doi:10.3139/146.110436 H. Yan, Y. Du, L. Zhou, H. Xu, L. Zhang, S. Liu, Int. J. Mater. Res., 101, 1489-96(2010).
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}
}