Eu–Mg phases

8 phases (tier A 4, tier C 3, liquid 1); 0 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 · Eu–Mg system page · Markdown · field reference

Phases of the Eu–Mg system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:eu-mg:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	no calculated diagram	0	1
EU2MG17 phase:eu-mg:eu2mg17	Ni17Th2 · hP38 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	no calculated diagram	0	1
EUMG_B2 phase:eu-mg:eumg-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	no calculated diagram	0	1
EUMG2_C14 phase:eu-mg:eumg2-c14	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	no calculated diagram	0	1
EUMG4 phase:eu-mg:eumg4	Mg4Sr · hP90 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	no calculated diagram	0	1
EUMG5 phase:eu-mg:eumg5	EuMg5 · hP42 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	no calculated diagram	0	1
HCP_A3 phase:eu-mg:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	no calculated diagram	0	1
LIQUID phase:eu-mg:liquid	liquid	liquid	no calculated diagram	4	1

BCC_A2 (Eu–Mg)

Id: phase:eu-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: Eu 1.0000
Stability: no calculated diagram
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-mg:bcc-a2
tdb: tdb:EuMg-08Tao.tdb:BCC_A2

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

EuMg-08Tao.tdb: BCC_A2, type code %B, sha256 8aec385f6e458adc…

28: PHASE BCC_A2 %B 2 1 3 !
29: CONST BCC_A2 : EU : VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2008.07.003 X.M. Tao, H. Wang, W.J. Zhu, H.S. Liu, Y.F. Ouyang, Z.P. Jin, Thermodynamic description of the Mg–Eu binary system, Calphad 32, 462-465 (2008).
assessment that models this phase

EU2MG17 (Eu–Mg)

Id: phase:eu-mg:eu2mg17; status assigned
Structure: Ni17Th2 · hP38 · P6_3/mmc (194); type st:ni17th2-hp38; 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_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Eu 0.1053, Mg 0.8947
Stability: no calculated diagram
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-mg:eu2mg17
tdb: tdb:EuMg-08Tao.tdb:EU2MG17

TDB models of EU2MG17 (1): PHASE and CONSTITUENT statements as written

EuMg-08Tao.tdb: EU2MG17, type code %, sha256 8aec385f6e458adc…

60: PHASE EU2MG17 % 2 2 17 !
61: CONST EU2MG17 : EU : MG : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2008.07.003 X.M. Tao, H. Wang, W.J. Zhu, H.S. Liu, Y.F. Ouyang, Z.P. Jin, Thermodynamic description of the Mg–Eu binary system, Calphad 32, 462-465 (2008).
assessment that models this phase

EUMG_B2 (Eu–Mg)

Id: phase:eu-mg:eumg-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Stoichiometry: Eu 0.5000, Mg 0.5000
Stability: no calculated diagram
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-mg:eumg-b2
tdb: tdb:EuMg-08Tao.tdb:EUMG_B2

TDB models of EUMG_B2 (1): PHASE and CONSTITUENT statements as written

EuMg-08Tao.tdb: EUMG_B2, type code %, sha256 8aec385f6e458adc…

38: PHASE EUMG_B2 % 2 1 1 !
39: CONST EUMG_B2 : EU : MG : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2008.07.003 X.M. Tao, H. Wang, W.J. Zhu, H.S. Liu, Y.F. Ouyang, Z.P. Jin, Thermodynamic description of the Mg–Eu binary system, Calphad 32, 462-465 (2008).
assessment that models this phase

EUMG2_C14 (Eu–Mg)

Id: phase:eu-mg:eumg2-c14; status assigned
Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type st:c14-mgzn2-hp12; tier A: standard phase name; confidence high
Stoichiometry: Eu 0.3333, Mg 0.6667
Stability: no calculated diagram
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-mg:eumg2-c14
tdb: tdb:EuMg-08Tao.tdb:EUMG2_C14

TDB models of EUMG2_C14 (1): PHASE and CONSTITUENT statements as written

EuMg-08Tao.tdb: EUMG2_C14, type code %, sha256 8aec385f6e458adc…

43: PHASE EUMG2_C14 % 2 1 2 !
44: CONST EUMG2_C14 : EU : MG : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2008.07.003 X.M. Tao, H. Wang, W.J. Zhu, H.S. Liu, Y.F. Ouyang, Z.P. Jin, Thermodynamic description of the Mg–Eu binary system, Calphad 32, 462-465 (2008).
assessment that models this phase

EUMG4 (Eu–Mg)

Id: phase:eu-mg:eumg4; status assigned
Structure: Mg4Sr · hP90 · P6_3/mmc (194); type st:mg4sr-hp90; 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_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Eu 0.2000, Mg 0.8000
Stability: no calculated diagram
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-mg:eumg4
tdb: tdb:EuMg-08Tao.tdb:EUMG4

TDB models of EUMG4 (1): PHASE and CONSTITUENT statements as written

EuMg-08Tao.tdb: EUMG4, type code %, sha256 8aec385f6e458adc…

48: PHASE EUMG4 % 2 1 4 !
49: CONST EUMG4 : EU : MG : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2008.07.003 X.M. Tao, H. Wang, W.J. Zhu, H.S. Liu, Y.F. Ouyang, Z.P. Jin, Thermodynamic description of the Mg–Eu binary system, Calphad 32, 462-465 (2008).
assessment that models this phase

EUMG5 (Eu–Mg)

Id: phase:eu-mg:eumg5; status assigned
Structure: EuMg5 · hP42 · P6_3/mmc (194); type st:eumg5-hp42; 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_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Eu 0.1667, Mg 0.8333
Stability: no calculated diagram
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-mg:eumg5
tdb: tdb:EuMg-08Tao.tdb:EUMG5

TDB models of EUMG5 (1): PHASE and CONSTITUENT statements as written

EuMg-08Tao.tdb: EUMG5, type code %, sha256 8aec385f6e458adc…

55: PHASE EUMG5 % 2 1 5 !
56: CONST EUMG5 : EU : MG : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2008.07.003 X.M. Tao, H. Wang, W.J. Zhu, H.S. Liu, Y.F. Ouyang, Z.P. Jin, Thermodynamic description of the Mg–Eu binary system, Calphad 32, 462-465 (2008).
assessment that models this phase

HCP_A3 (Eu–Mg)

Id: phase:eu-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
Stoichiometry: Mg 1.0000
Stability: no calculated diagram
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:eu-mg:hcp-a3
tdb: tdb:EuMg-08Tao.tdb:HCP_A3

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

EuMg-08Tao.tdb: HCP_A3, type code %A, sha256 8aec385f6e458adc…

33: PHASE HCP_A3 %A 2 1 0.5 !
34: CONST HCP_A3 : MG% : VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2008.07.003 X.M. Tao, H. Wang, W.J. Zhu, H.S. Liu, Y.F. Ouyang, Z.P. Jin, Thermodynamic description of the Mg–Eu binary system, Calphad 32, 462-465 (2008).
assessment that models this phase

LIQUID (Eu–Mg)

Id: phase:eu-mg:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: no calculated diagram
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:eu-mg:liquid
paper: paper:10.1016/j.calphad.2008.07.003:L
tdb: tdb:EuMg-08Tao.tdb:LIQUID

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

EuMg-08Tao.tdb: LIQUID, type code %, sha256 8aec385f6e458adc…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : EU MG : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2008.07.003 X.M. Tao, H. Wang, W.J. Zhu, H.S. Liu, Y.F. Ouyang, Z.P. Jin, Thermodynamic description of the Mg–Eu binary system, Calphad 32, 462-465 (2008).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(69)90045-9 Werner Mühlpfordt, Wilhelm Klemm, Zur Kenntnis des systems Magnesium-Europium III. Das Zustandsdiagramm des systems MgEu, Journal of the Less Common Metals 17, 127-129 (1969).
cited as the source of 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}
}