Co–Mg phases

5 phases (tier A 4, 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 · Co–Mg system page · Markdown · field reference

Phases of the Co–Mg system (5)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:co-mg:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
CO2MG_C14 phase:co-mg:co2mg-c14	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1242.77 K, x(Mg) 0.33333–0.33333	5	1
FCC_A1 phase:co-mg:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 657.5–1790.45 K, x(Mg) 0–0.00444	2	1
HCP_A3 phase:co-mg:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–924.23 K, x(Mg) 0–1	3	1
LIQUID phase:co-mg:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 909.23–2500 K, x(Mg) 0–1	10	1

BCC_A2 (Co–Mg)

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

Names (2): corpus: corpus:phase:co-mg:bcc-a2
tdb: tdb:CoMg-22Yan.tdb:BCC_A2

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

CoMg-22Yan.tdb: BCC_A2, type code %B, sha256 edaa24ff0861bcf5…

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

Example references (1 of 1; assessments first):

doi:10.2298/JMMB210606051Y L.-F. Yang, X.-D. Si, H.-Q. Zhang, F.-Y. Gao, Y.-P. Zheng, Y.-L. Liu, Y.-R. Wang, Y. Du, J. Min. Metall. B, 58, 109-15(2022).
assessment that models this phase

CO2MG_C14 (Co–Mg)

Id: phase:co-mg:co2mg-c14; status assigned
Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type st:c14-mgzn2-hp12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaabxfmp and oqmd-2066444, space group 194
Stoichiometry: Co 0.6667, Mg 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1242.77 K, x(Mg) 0.33333–0.33333
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:co-mg:co2mg-c14
mp: mp:mp-aaabxfmp
oqmd: oqmd:oqmd-2066444
paper: paper:10.2298/jmmb210606051y:MgCo2
tdb: tdb:CoMg-22Yan.tdb:CO2MG_C14

TDB models of CO2MG_C14 (1): PHASE and CONSTITUENT statements as written

CoMg-22Yan.tdb: CO2MG_C14, type code %, sha256 edaa24ff0861bcf5…

47: PHASE CO2MG_C14 % 2 2 1 !
48: CONST CO2MG_C14 : CO : MG : !

Example references (1 of 1; assessments first):

doi:10.2298/JMMB210606051Y L.-F. Yang, X.-D. Si, H.-Q. Zhang, F.-Y. Gao, Y.-P. Zheng, Y.-L. Liu, Y.-R. Wang, Y. Du, J. Min. Metall. B, 58, 109-15(2022).
assessment that models this phase; reports values for this phase

FCC_A1 (Co–Mg)

Id: phase:co-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: stable in 1 of 1 calculated diagram(s): 657.5–1790.45 K, x(Mg) 0–0.00444
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:co-mg:fcc-a1
paper: paper:10.2298/jmmb210606051y:(αCo)
tdb: tdb:CoMg-22Yan.tdb:FCC_A1

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

CoMg-22Yan.tdb: FCC_A1, type code %A, sha256 edaa24ff0861bcf5…

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

Example references (1 of 1; assessments first):

doi:10.2298/JMMB210606051Y L.-F. Yang, X.-D. Si, H.-Q. Zhang, F.-Y. Gao, Y.-P. Zheng, Y.-L. Liu, Y.-R. Wang, Y. Du, J. Min. Metall. B, 58, 109-15(2022).
assessment that models this phase; reports values for this phase

HCP_A3 (Co–Mg)

Id: phase:co-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): 300–924.23 K, x(Mg) 0–1
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:co-mg:hcp-a3
paper: paper:10.2298/jmmb210606051y:(Mg)
tdb: tdb:CoMg-22Yan.tdb:HCP_A3

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

CoMg-22Yan.tdb: HCP_A3, type code %A, sha256 edaa24ff0861bcf5…

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

Example references (1 of 1; assessments first):

doi:10.2298/JMMB210606051Y L.-F. Yang, X.-D. Si, H.-Q. Zhang, F.-Y. Gao, Y.-P. Zheng, Y.-L. Liu, Y.-R. Wang, Y. Du, J. Min. Metall. B, 58, 109-15(2022).
assessment that models this phase; reports values for this phase

LIQUID (Co–Mg)

Id: phase:co-mg:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 909.23–2500 K, x(Mg) 0–1
Literature: 10 values (10 accepted) from 2 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:co-mg:liquid
paper: paper:10.1007/bf02869271:liquid, paper:10.2298/jmmb210606051y:L
tdb: tdb:CoMg-22Yan.tdb:LIQUID

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

CoMg-22Yan.tdb: LIQUID, type code %, sha256 edaa24ff0861bcf5…

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

Example references (2 of 2; assessments first):

doi:10.2298/JMMB210606051Y L.-F. Yang, X.-D. Si, H.-Q. Zhang, F.-Y. Gao, Y.-P. Zheng, Y.-L. Liu, Y.-R. Wang, Y. Du, J. Min. Metall. B, 58, 109-15(2022).
assessment that models this phase; reports values for this phase
doi:10.1007/bf02869271 R. I. Sheldon, E. M. Foltyn, D. E. Peterson, The Sn-U (Tin-Uranium) system, Bulletin of Alloy Phase Diagrams 8, 347-352 (1987).
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}
}