Ho–Mg phases

7 phases (tier A 6, liquid 1); 6 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 · Ho–Mg system page · Markdown · field reference

Phases of the Ho–Mg system (7)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:ho-mg:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 958.15–1600 K, x(Mg) 0.08–0.42442	4
B2_BCC phase:ho-mg:bcc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1625.33 K, x(Mg) 0.06164–0.62095	2
C14_LAVES phase:ho-mg:c14-laves	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–967.06 K, x(Mg) 0.64097–0.6858	2
FCC_A1 phase:ho-mg:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 2 calculated diagram(s)	2
HCP_A3 phase:ho-mg:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1753.18 K, x(Mg) 0–1	2
HO5MG24_A12 phase:ho-mg:ho5mg24-a12	alpha-Mn · A12 · cI58 · I-43m (217)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–862.27 K, x(Mg) 0.82759–0.84828	2
LIQUID phase:ho-mg:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 842.88–2500 K, x(Mg) 0–1	2

BCC_A2 (Ho–Mg)

Id: phase:ho-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: stable in 2 of 2 calculated diagram(s): 958.15–1600 K, x(Mg) 0.08–0.42442
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ho-mg:bcc-a2
tdb: tdb:HoMg-03Cac-LB.tdb:A2_BCC, tdb:HoMg-03Cac-LB.tdb:BCC_A2, tdb:HoMg-13Tok.tdb:A2_BCC, tdb:HoMg-13Tok.tdb:BCC_A2

TDB models of BCC_A2 (4): PHASE and CONSTITUENT statements as written

HoMg-03Cac-LB.tdb: A2_BCC, type code %B, sha256 b1d78ae01625f0f3…

36: PHASE A2_BCC %B 2 1 3 !
37: CONST A2_BCC : HO MG : VA : !

HoMg-03Cac-LB.tdb: BCC_A2, type code %B, sha256 b1d78ae01625f0f3…

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

HoMg-13Tok.tdb: A2_BCC, type code %B, sha256 e7b08f0b3a66762f…

41: PHASE A2_BCC %B 2 1 3 !
42: CONST A2_BCC : HO MG : VA : !

HoMg-13Tok.tdb: BCC_A2, type code %B, sha256 e7b08f0b3a66762f…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : HO MG : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/S0966-9795(03)00151-1 G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).
assessment that models this phase
doi:10.2320/matertrans.MI201226 T. Tokunaga, H. Kominato, S. Iikubo, H. Ohtani, Mater. Trans. (JIM), 54, 647-55(2013).
assessment that models this phase

B2_BCC (Ho–Mg)

Id: phase:ho-mg:bcc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: HoMg-03Cac-LB.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
Caveat: HoMg-13Tok.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
Caveat: partitioned order/disorder model in HoMg-03Cac-LB.tdb also describes the disordered state
Caveat: partitioned order/disorder model in HoMg-13Tok.tdb also describes the disordered state
Stability: stable in 2 of 2 calculated diagram(s): 300–1625.33 K, x(Mg) 0.06164–0.62095
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ho-mg:bcc-b2
tdb: tdb:HoMg-03Cac-LB.tdb:B2_BCC, tdb:HoMg-13Tok.tdb:B2_BCC

TDB models of B2_BCC (2): PHASE and CONSTITUENT statements as written

HoMg-03Cac-LB.tdb: B2_BCC, type code %O, sha256 b1d78ae01625f0f3…

41: PHASE B2_BCC %O 3 0.5 0.5 3 !
42: CONST B2_BCC : HO% MG : HO MG% : VA : !

HoMg-13Tok.tdb: B2_BCC, type code %O, sha256 e7b08f0b3a66762f…

46: PHASE B2_BCC %O 3 0.5 0.5 3 !
47: CONST B2_BCC : HO% MG : HO MG% : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/S0966-9795(03)00151-1 G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).
assessment that models this phase
doi:10.2320/matertrans.MI201226 T. Tokunaga, H. Kominato, S. Iikubo, H. Ohtani, Mater. Trans. (JIM), 54, 647-55(2013).
assessment that models this phase

C14_LAVES (Ho–Mg)

Id: phase:ho-mg:c14-laves; status assigned
Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type st:c14-mgzn2-hp12; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in HoMg-03Cac-LB.tdb also describes the disordered state
Caveat: partitioned order/disorder model in HoMg-13Tok.tdb also describes the disordered state
Stability: stable in 2 of 2 calculated diagram(s): 300–967.06 K, x(Mg) 0.64097–0.6858
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ho-mg:c14-laves
tdb: tdb:HoMg-03Cac-LB.tdb:C14_LAVES, tdb:HoMg-13Tok.tdb:C14_LAVES

TDB models of C14_LAVES (2): PHASE and CONSTITUENT statements as written

HoMg-03Cac-LB.tdb: C14_LAVES, type code %, sha256 b1d78ae01625f0f3…

51: PHASE C14_LAVES % 2 2 1 !
52: CONST C14_LAVES : HO MG% : HO% MG : !

HoMg-13Tok.tdb: C14_LAVES, type code %, sha256 e7b08f0b3a66762f…

56: PHASE C14_LAVES % 2 2 1 !
57: CONST C14_LAVES : HO MG% : HO% MG : !

Example references (2 of 2; assessments first):

doi:10.1016/S0966-9795(03)00151-1 G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).
assessment that models this phase
doi:10.2320/matertrans.MI201226 T. Tokunaga, H. Kominato, S. Iikubo, H. Ohtani, Mater. Trans. (JIM), 54, 647-55(2013).
assessment that models this phase

FCC_A1 (Ho–Mg)

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

Names (3): corpus: corpus:phase:ho-mg:fcc-a1
tdb: tdb:HoMg-03Cac-LB.tdb:FCC_A1, tdb:HoMg-13Tok.tdb:FCC_A1

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

HoMg-03Cac-LB.tdb: FCC_A1, type code %A, sha256 b1d78ae01625f0f3…

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

HoMg-13Tok.tdb: FCC_A1, type code %A, sha256 e7b08f0b3a66762f…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : HO MG : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/S0966-9795(03)00151-1 G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).
assessment that models this phase
doi:10.2320/matertrans.MI201226 T. Tokunaga, H. Kominato, S. Iikubo, H. Ohtani, Mater. Trans. (JIM), 54, 647-55(2013).
assessment that models this phase

HCP_A3 (Ho–Mg)

Id: phase:ho-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 2 of 2 calculated diagram(s): 300–1753.18 K, x(Mg) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ho-mg:hcp-a3
tdb: tdb:HoMg-03Cac-LB.tdb:HCP_A3, tdb:HoMg-13Tok.tdb:HCP_A3

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

HoMg-03Cac-LB.tdb: HCP_A3, type code %A, sha256 b1d78ae01625f0f3…

46: PHASE HCP_A3 %A 2 1 0.5 !
47: CONST HCP_A3 : HO MG : VA : !

HoMg-13Tok.tdb: HCP_A3, type code %A, sha256 e7b08f0b3a66762f…

51: PHASE HCP_A3 %A 2 1 0.5 !
52: CONST HCP_A3 : HO MG : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/S0966-9795(03)00151-1 G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).
assessment that models this phase
doi:10.2320/matertrans.MI201226 T. Tokunaga, H. Kominato, S. Iikubo, H. Ohtani, Mater. Trans. (JIM), 54, 647-55(2013).
assessment that models this phase

HO5MG24_A12 (Ho–Mg)

Id: phase:ho-mg:ho5mg24-a12; status assigned
Structure: alpha-Mn · A12 · cI58 · I-43m (217); type st:a12-alpha-mn-ci58; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–862.27 K, x(Mg) 0.82759–0.84828
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ho-mg:ho5mg24-a12
tdb: tdb:HoMg-03Cac-LB.tdb:HO5MG24_A12, tdb:HoMg-13Tok.tdb:HO5MG24_A12

TDB models of HO5MG24_A12 (2): PHASE and CONSTITUENT statements as written

HoMg-03Cac-LB.tdb: HO5MG24_A12, type code %, sha256 b1d78ae01625f0f3…

56: PHASE HO5MG24_A12 % 3 5 12 12 !
57: CONST HO5MG24_A12 : HO% MG : MG : MG : !

HoMg-13Tok.tdb: HO5MG24_A12, type code %, sha256 e7b08f0b3a66762f…

61: PHASE HO5MG24_A12 % 3 5 12 12 !
62: CONST HO5MG24_A12 : HO% MG : MG : MG : !

Example references (2 of 2; assessments first):

doi:10.1016/S0966-9795(03)00151-1 G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).
assessment that models this phase
doi:10.2320/matertrans.MI201226 T. Tokunaga, H. Kominato, S. Iikubo, H. Ohtani, Mater. Trans. (JIM), 54, 647-55(2013).
assessment that models this phase

LIQUID (Ho–Mg)

Id: phase:ho-mg:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 842.88–2500 K, x(Mg) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ho-mg:liquid
tdb: tdb:HoMg-03Cac-LB.tdb:LIQUID, tdb:HoMg-13Tok.tdb:LIQUID

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

HoMg-03Cac-LB.tdb: LIQUID, type code %, sha256 b1d78ae01625f0f3…

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

HoMg-13Tok.tdb: LIQUID, type code %, sha256 e7b08f0b3a66762f…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : HO MG : !

Example references (2 of 2; assessments first):

doi:10.1016/S0966-9795(03)00151-1 G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).
assessment that models this phase
doi:10.2320/matertrans.MI201226 T. Tokunaga, H. Kominato, S. Iikubo, H. Ohtani, Mater. Trans. (JIM), 54, 647-55(2013).
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}
}