# Ho–Mg phases > Ho–Mg system: 7 phases (tier A 6, liquid 1); 6 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/HO-MG.html · Markdown: https://data.orchid-project.org/phases/pages/HO-MG.md 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](https://orchid-project.org/phases/?q=HO-MG) · [full JSON](https://data.orchid-project.org/phases/systems/HO-MG.json) · [Ho–Mg system page](https://data.orchid-project.org/systems/HO-MG.html) · [Markdown](https://data.orchid-project.org/phases/pages/HO-MG.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the Ho–Mg system (7) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [BCC_A2](#phase-ho-mg-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 | 0 | 4 | | [B2_BCC](#phase-ho-mg-bcc-b2); _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 | 0 | 2 | | [C14_LAVES](#phase-ho-mg-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 | 0 | 2 | | [FCC_A1](#phase-ho-mg-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) | 0 | 2 | | [HCP_A3](#phase-ho-mg-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 | 0 | 2 | | [HO5MG24_A12](#phase-ho-mg-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 | 0 | 2 | | [LIQUID](#phase-ho-mg-liquid); _phase:ho-mg:liquid_ | liquid | liquid | stable in 2 of 2 calculated diagram(s): 842.88–2500 K, x(Mg) 0–1 | 0 | 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](https://orchid-project.org/phases/#phase:ho-mg:bcc-a2) 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](https://orchid-project.org/data/databases/sgte-binary/HoMg-03Cac-LB.tdb): A2_BCC, type code %B, sha256 `b1d78ae01625f0f3…` ~~~~text 36: PHASE A2_BCC %B 2 1 3 ! 37: CONST A2_BCC : HO MG : VA : ! ~~~~ [HoMg-03Cac-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/HoMg-03Cac-LB.tdb): BCC_A2, type code %B, sha256 `b1d78ae01625f0f3…` ~~~~text 31: PHASE BCC_A2 %B 2 1 3 ! 32: CONST BCC_A2 : HO MG : VA : ! ~~~~ [HoMg-13Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/HoMg-13Tok.tdb): A2_BCC, type code %B, sha256 `e7b08f0b3a66762f…` ~~~~text 41: PHASE A2_BCC %B 2 1 3 ! 42: CONST A2_BCC : HO MG : VA : ! ~~~~ [HoMg-13Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/HoMg-13Tok.tdb): BCC_A2, type code %B, sha256 `e7b08f0b3a66762f…` ~~~~text 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](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003). _assessment that models this phase_ - [doi:10.2320/matertrans.MI201226](https://doi.org/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](https://orchid-project.org/phases/#phase:ho-mg:bcc-b2) 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](https://orchid-project.org/data/databases/sgte-binary/HoMg-03Cac-LB.tdb): B2_BCC, type code %O, sha256 `b1d78ae01625f0f3…` ~~~~text 41: PHASE B2_BCC %O 3 0.5 0.5 3 ! 42: CONST B2_BCC : HO% MG : HO MG% : VA : ! ~~~~ [HoMg-13Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/HoMg-13Tok.tdb): B2_BCC, type code %O, sha256 `e7b08f0b3a66762f…` ~~~~text 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](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003). _assessment that models this phase_ - [doi:10.2320/matertrans.MI201226](https://doi.org/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](https://orchid-project.org/phases/#phase:ho-mg:c14-laves) 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](https://orchid-project.org/data/databases/sgte-binary/HoMg-03Cac-LB.tdb): C14_LAVES, type code %, sha256 `b1d78ae01625f0f3…` ~~~~text 51: PHASE C14_LAVES % 2 2 1 ! 52: CONST C14_LAVES : HO MG% : HO% MG : ! ~~~~ [HoMg-13Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/HoMg-13Tok.tdb): C14_LAVES, type code %, sha256 `e7b08f0b3a66762f…` ~~~~text 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](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003). _assessment that models this phase_ - [doi:10.2320/matertrans.MI201226](https://doi.org/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](https://orchid-project.org/phases/#phase:ho-mg:fcc-a1) 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](https://orchid-project.org/data/databases/sgte-binary/HoMg-03Cac-LB.tdb): FCC_A1, type code %A, sha256 `b1d78ae01625f0f3…` ~~~~text 26: PHASE FCC_A1 %A 2 1 1 ! 27: CONST FCC_A1 : HO MG : VA : ! ~~~~ [HoMg-13Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/HoMg-13Tok.tdb): FCC_A1, type code %A, sha256 `e7b08f0b3a66762f…` ~~~~text 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](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003). _assessment that models this phase_ - [doi:10.2320/matertrans.MI201226](https://doi.org/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](https://orchid-project.org/phases/#phase:ho-mg:hcp-a3) 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](https://orchid-project.org/data/databases/sgte-binary/HoMg-03Cac-LB.tdb): HCP_A3, type code %A, sha256 `b1d78ae01625f0f3…` ~~~~text 46: PHASE HCP_A3 %A 2 1 0.5 ! 47: CONST HCP_A3 : HO MG : VA : ! ~~~~ [HoMg-13Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/HoMg-13Tok.tdb): HCP_A3, type code %A, sha256 `e7b08f0b3a66762f…` ~~~~text 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](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003). _assessment that models this phase_ - [doi:10.2320/matertrans.MI201226](https://doi.org/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](https://orchid-project.org/phases/#phase:ho-mg:ho5mg24-a12) 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](https://orchid-project.org/data/databases/sgte-binary/HoMg-03Cac-LB.tdb): HO5MG24_A12, type code %, sha256 `b1d78ae01625f0f3…` ~~~~text 56: PHASE HO5MG24_A12 % 3 5 12 12 ! 57: CONST HO5MG24_A12 : HO% MG : MG : MG : ! ~~~~ [HoMg-13Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/HoMg-13Tok.tdb): HO5MG24_A12, type code %, sha256 `e7b08f0b3a66762f…` ~~~~text 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](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003). _assessment that models this phase_ - [doi:10.2320/matertrans.MI201226](https://doi.org/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](https://orchid-project.org/phases/#phase:ho-mg:liquid) 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](https://orchid-project.org/data/databases/sgte-binary/HoMg-03Cac-LB.tdb): LIQUID, type code %, sha256 `b1d78ae01625f0f3…` ~~~~text 21: PHASE LIQUID:L % 1 1 ! 22: CONST LIQUID:L : HO MG : ! ~~~~ [HoMg-13Tok.tdb](https://orchid-project.org/data/databases/sgte-binary/HoMg-13Tok.tdb): LIQUID, type code %, sha256 `e7b08f0b3a66762f…` ~~~~text 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](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003). _assessment that models this phase_ - [doi:10.2320/matertrans.MI201226](https://doi.org/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). 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).