Mg–Sc 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 · Mg–Sc system page · Markdown · field reference

Phases of the Mg–Sc system (5)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:mg-sc:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 688.26–2499 K, x(Sc) 0.20163–1	2
FCC_A1 phase:mg-sc:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 2 calculated diagram(s)	2
HCP_A3 phase:mg-sc:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1812.99 K, x(Sc) 0–1	2
LIQUID phase:mg-sc:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 923–2500 K, x(Sc) 0–1	2
MGSC_B2 phase:mg-sc:mgsc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–797.61 K, x(Sc) 0.28526–0.5	2

BCC_A2 (Mg–Sc)

Id: phase:mg-sc:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 688.26–2499 K, x(Sc) 0.20163–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-sc:bcc-a2
tdb: tdb:MgSc-22Wan.tdb:BCC_A2, tdb:MgSc-98Pis-LB.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

MgSc-22Wan.tdb: BCC_A2, type code %B, sha256 0c840466b260fee1…

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

MgSc-98Pis-LB.tdb: BCC_A2, type code %B, sha256 a01e1abe7e26d7d9…

31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : MG SC% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2022.102406 Y. Wang, K. Gao, X. Tao, W.-S. Ko, J. Wang, F. Chen, G. Xu, Y. Cui, Calphad, 77, 102406(2022).
assessment that models this phase
doi:10.3139/ijmr-1998-0086 A. Pisch, R. Schmid-Fetzer, G. Cacciamani, P. Riani, A. Saccone, R. Ferro, Z. Metallkd., 89, 474-77(1998).
assessment that models this phase

FCC_A1 (Mg–Sc)

Id: phase:mg-sc: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 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-sc:fcc-a1
tdb: tdb:MgSc-22Wan.tdb:FCC_A1, tdb:MgSc-98Pis-LB.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

MgSc-22Wan.tdb: FCC_A1, type code %A, sha256 0c840466b260fee1…

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

MgSc-98Pis-LB.tdb: FCC_A1, type code %A, sha256 a01e1abe7e26d7d9…

26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : MG SC : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2022.102406 Y. Wang, K. Gao, X. Tao, W.-S. Ko, J. Wang, F. Chen, G. Xu, Y. Cui, Calphad, 77, 102406(2022).
assessment that models this phase
doi:10.3139/ijmr-1998-0086 A. Pisch, R. Schmid-Fetzer, G. Cacciamani, P. Riani, A. Saccone, R. Ferro, Z. Metallkd., 89, 474-77(1998).
assessment that models this phase

HCP_A3 (Mg–Sc)

Id: phase:mg-sc: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 2 of 2 calculated diagram(s): 300–1812.99 K, x(Sc) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-sc:hcp-a3
tdb: tdb:MgSc-22Wan.tdb:HCP_A3, tdb:MgSc-98Pis-LB.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

MgSc-22Wan.tdb: HCP_A3, type code %A, sha256 0c840466b260fee1…

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

MgSc-98Pis-LB.tdb: HCP_A3, type code %A, sha256 a01e1abe7e26d7d9…

36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : MG SC : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2022.102406 Y. Wang, K. Gao, X. Tao, W.-S. Ko, J. Wang, F. Chen, G. Xu, Y. Cui, Calphad, 77, 102406(2022).
assessment that models this phase
doi:10.3139/ijmr-1998-0086 A. Pisch, R. Schmid-Fetzer, G. Cacciamani, P. Riani, A. Saccone, R. Ferro, Z. Metallkd., 89, 474-77(1998).
assessment that models this phase

LIQUID (Mg–Sc)

Id: phase:mg-sc:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 923–2500 K, x(Sc) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-sc:liquid
tdb: tdb:MgSc-22Wan.tdb:LIQUID, tdb:MgSc-98Pis-LB.tdb:LIQUID

TDB models of LIQUID (2): PHASE and CONSTITUENT statements as written

MgSc-22Wan.tdb: LIQUID, type code %, sha256 0c840466b260fee1…

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

MgSc-98Pis-LB.tdb: LIQUID, type code %, sha256 a01e1abe7e26d7d9…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : MG SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2022.102406 Y. Wang, K. Gao, X. Tao, W.-S. Ko, J. Wang, F. Chen, G. Xu, Y. Cui, Calphad, 77, 102406(2022).
assessment that models this phase
doi:10.3139/ijmr-1998-0086 A. Pisch, R. Schmid-Fetzer, G. Cacciamani, P. Riani, A. Saccone, R. Ferro, Z. Metallkd., 89, 474-77(1998).
assessment that models this phase

MGSC_B2 (Mg–Sc)

Id: phase:mg-sc:mgsc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–797.61 K, x(Sc) 0.28526–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-sc:mgsc-b2
tdb: tdb:MgSc-22Wan.tdb:MGSC_B2, tdb:MgSc-98Pis-LB.tdb:MGSC_B2

TDB models of MGSC_B2 (2): PHASE and CONSTITUENT statements as written

MgSc-22Wan.tdb: MGSC_B2, type code %, sha256 0c840466b260fee1…

42: PHASE MGSC_B2 % 2 1 1 !
43: CONST MGSC_B2 : MG : MG SC% : !

MgSc-98Pis-LB.tdb: MGSC_B2, type code %, sha256 a01e1abe7e26d7d9…

41: PHASE MGSC_B2 % 2 1 1 !
42: CONST MGSC_B2 : MG : SC : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2022.102406 Y. Wang, K. Gao, X. Tao, W.-S. Ko, J. Wang, F. Chen, G. Xu, Y. Cui, Calphad, 77, 102406(2022).
assessment that models this phase
doi:10.3139/ijmr-1998-0086 A. Pisch, R. Schmid-Fetzer, G. Cacciamani, P. Riani, A. Saccone, R. Ferro, Z. Metallkd., 89, 474-77(1998).
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}
}