# Ge–Mg phases > Ge–Mg system: 6 phases (tier A 5, liquid 1); 4 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references. HTML: https://data.orchid-project.org/phases/pages/GE-MG.html · Markdown: https://data.orchid-project.org/phases/pages/GE-MG.md 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](https://orchid-project.org/phases/?q=GE-MG) · [full JSON](https://data.orchid-project.org/phases/systems/GE-MG.json) · [Ge–Mg system page](https://data.orchid-project.org/systems/GE-MG.html) · [Markdown](https://data.orchid-project.org/phases/pages/GE-MG.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the Ge–Mg system (6) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [DIAMOND_A4](#phase-ge-mg-a4-diamond); _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 | 0 | 3 | | [BCC_A2](#phase-ge-mg-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) | 0 | 3 | | [FCC_A1](#phase-ge-mg-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) | 0 | 3 | | [GEMG2_C1](#phase-ge-mg-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 | 0 | 3 | | [HCP_A3](#phase-ge-mg-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 | 0 | 3 | | [LIQUID](#phase-ge-mg-liquid); _phase:ge-mg:liquid_ | liquid | liquid | stable in 3 of 3 calculated diagram(s): 903.71–2500 K, x(Mg) 0–1 | 0 | 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](https://orchid-project.org/phases/#phase:ge-mg:a4-diamond) 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](https://orchid-project.org/data/databases/sgte-binary/GeMg-06Isl.tdb): DIAMOND_A4, type code %, sha256 `8081df690d59d028…` ~~~~text 42: PHASE DIAMOND_A4 % 1 1 ! 43: CONST DIAMOND_A4 : GE : ! ~~~~ [GeMg-10Yan-1.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-1.tdb): DIAMOND_A4, type code %, sha256 `22c07581734a5757…` ~~~~text 47: PHASE DIAMOND_A4 % 1 1 ! 48: CONST DIAMOND_A4 : GE : ! ~~~~ [GeMg-10Yan-2.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-2.tdb): DIAMOND_A4, type code %, sha256 `12570a7d080460a4…` ~~~~text 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](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:ge-mg:bcc-a2) 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](https://orchid-project.org/data/databases/sgte-binary/GeMg-06Isl.tdb): BCC_A2, type code %B, sha256 `8081df690d59d028…` ~~~~text 32: PHASE BCC_A2 %B 2 1 3 ! 33: CONST BCC_A2 : GE MG : VA : ! ~~~~ [GeMg-10Yan-1.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-1.tdb): BCC_A2, type code %B, sha256 `22c07581734a5757…` ~~~~text 37: PHASE BCC_A2 %B 2 1 3 ! 38: CONST BCC_A2 : GE MG : VA : ! ~~~~ [GeMg-10Yan-2.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-2.tdb): BCC_A2, type code %B, sha256 `12570a7d080460a4…` ~~~~text 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](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:ge-mg:fcc-a1) 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](https://orchid-project.org/data/databases/sgte-binary/GeMg-06Isl.tdb): FCC_A1, type code %A, sha256 `8081df690d59d028…` ~~~~text 27: PHASE FCC_A1 %A 2 1 1 ! 28: CONST FCC_A1 : GE MG : VA : ! ~~~~ [GeMg-10Yan-1.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-1.tdb): FCC_A1, type code %A, sha256 `22c07581734a5757…` ~~~~text 32: PHASE FCC_A1 %A 2 1 1 ! 33: CONST FCC_A1 : GE MG : VA : ! ~~~~ [GeMg-10Yan-2.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-2.tdb): FCC_A1, type code %A, sha256 `12570a7d080460a4…` ~~~~text 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](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:ge-mg:gemg2-c1) 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](https://orchid-project.org/data/databases/sgte-binary/GeMg-06Isl.tdb): GEMG2_C1, type code %, sha256 `8081df690d59d028…` ~~~~text 47: PHASE GEMG2_C1 % 2 1 2 ! 48: CONST GEMG2_C1 : GE : MG : ! ~~~~ [GeMg-10Yan-1.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-1.tdb): GEMG2_C1, type code %, sha256 `22c07581734a5757…` ~~~~text 52: PHASE GEMG2_C1 % 2 1 2 ! 53: CONST GEMG2_C1 : GE : MG : ! ~~~~ [GeMg-10Yan-2.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-2.tdb): GEMG2_C1, type code %, sha256 `12570a7d080460a4…` ~~~~text 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](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:ge-mg:hcp-a3) 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](https://orchid-project.org/data/databases/sgte-binary/GeMg-06Isl.tdb): HCP_A3, type code %, sha256 `8081df690d59d028…` ~~~~text 37: PHASE HCP_A3 % 2 1 0.5 ! 38: CONST HCP_A3 : GE MG% : VA : ! ~~~~ [GeMg-10Yan-1.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-1.tdb): HCP_A3, type code %A, sha256 `22c07581734a5757…` ~~~~text 42: PHASE HCP_A3 %A 2 1 0.5 ! 43: CONST HCP_A3 : GE MG% : VA : ! ~~~~ [GeMg-10Yan-2.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-2.tdb): HCP_A3, type code %A, sha256 `12570a7d080460a4…` ~~~~text 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](https://doi.org/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](https://doi.org/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](https://orchid-project.org/phases/#phase:ge-mg:liquid) 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](https://orchid-project.org/data/databases/sgte-binary/GeMg-06Isl.tdb): LIQUID, type code %, sha256 `8081df690d59d028…` ~~~~text 22: PHASE LIQUID:L % 1 1 ! 23: CONST LIQUID:L : GE MG : ! ~~~~ [GeMg-10Yan-1.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-1.tdb): LIQUID, type code %, sha256 `22c07581734a5757…` ~~~~text 27: PHASE LIQUID:L % 1 1 ! 28: CONST LIQUID:L : GE MG : ! ~~~~ [GeMg-10Yan-2.tdb](https://orchid-project.org/data/databases/sgte-binary/GeMg-10Yan-2.tdb): LIQUID, type code %, sha256 `12570a7d080460a4…` ~~~~text 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](https://doi.org/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](https://doi.org/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). https://doi.org/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). https://doi.org/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. ```bibtex @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} } ``` --- Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).