# Ir–Mo phases > Ir–Mo system: 9 phases (tier A 6, liquid 1, needs_review 2); 8 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/IR-MO.html · Markdown: https://data.orchid-project.org/phases/pages/IR-MO.md 9 phases (tier A 6, liquid 1, needs_review 2); 8 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=IR-MO) · [full JSON](https://data.orchid-project.org/phases/systems/IR-MO.json) · [Ir–Mo system page](https://data.orchid-project.org/systems/IR-MO.html) · [Markdown](https://data.orchid-project.org/phases/pages/IR-MO.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the Ir–Mo system (9) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [BCC_A2](#phase-ir-mo-bcc-a2); _phase:ir-mo:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–3999.76 K, x(Mo) 0.84441–1 | 0 | 1 | | [FCC_A1](#phase-ir-mo-fcc-a1); _phase:ir-mo:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–2737.95 K, x(Mo) 0–0.22015 | 0 | 1 | | [HCP_A3](#phase-ir-mo-hcp-a3); _phase:ir-mo:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | not stable in 1 calculated diagram(s) | 0 | 1 | | [IR3MO_D019](#phase-ir-mo-ir3mo-d019); _phase:ir-mo:ir3mo-d019_ | Ni3Sn · D0_19 · hP8 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–2566.3 K, x(Mo) 0.20449–0.42924 | 0 | 1 | | [IR3MO7_D8B](#phase-ir-mo-ir3mo7-d8b); _phase:ir-mo:ir3mo7-d8b_ | | needs_review | stable in 1 of 1 calculated diagram(s): 2200–2362.52 K, x(Mo) 0.71667–0.71667 | 0 | 1 | | [IRMO_A3](#phase-ir-mo-irmo-a3); _phase:ir-mo:irmo-a3_ | | needs_review | stable in 1 of 1 calculated diagram(s): 1749.92–2572.01 K, x(Mo) 0.31203–0.61781 | 0 | 1 | | [IRMO_B19](#phase-ir-mo-irmo-b19); _phase:ir-mo:irmo-b19_ | AuCd · B19 · oP4 · Pmma (51) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1794.77 K, x(Mo) 0.5–0.5 | 0 | 1 | | [IRMO3_A15](#phase-ir-mo-irmo3-a15); _phase:ir-mo:irmo3-a15_ | Cr3Si · A15 · cP8 · Pm-3n (223) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 663.97–2388.79 K, x(Mo) 0.74174–0.78648 | 0 | 1 | | [LIQUID](#phase-ir-mo-liquid); _phase:ir-mo:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 2355.85–4000 K, x(Mo) 0–1 | 0 | 1 | ## BCC_A2 (Ir–Mo) - Id: `phase:ir-mo: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 1 of 1 calculated diagram(s): 300–3999.76 K, x(Mo) 0.84441–1 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ir-mo:bcc-a2) Names (2): _corpus: _corpus:phase:ir-mo:bcc-a2 _tdb: _tdb:IrMo-20Hua.tdb:BCC_A2 ### TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written [IrMo-20Hua.tdb](https://orchid-project.org/data/databases/sgte-binary/IrMo-20Hua.tdb): BCC_A2, type code %B, sha256 `459a311c8def4706…` ~~~~text 35: PHASE BCC_A2 %B 2 1 3 ! 36: CONST BCC_A2 : IR MO% : VA : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.2298/JMMB190211001H](https://doi.org/10.2298/JMMB190211001H) Y.-Y. Huang, B. Wu, F. Li, L.-L. Chen, Z.-X. Deng, K. Chang, J. Mining Metall. B, 56, 109-18(2020). _assessment that models this phase_ ## FCC_A1 (Ir–Mo) - Id: `phase:ir-mo: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): 300–2737.95 K, x(Mo) 0–0.22015 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ir-mo:fcc-a1) Names (2): _corpus: _corpus:phase:ir-mo:fcc-a1 _tdb: _tdb:IrMo-20Hua.tdb:FCC_A1 ### TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written [IrMo-20Hua.tdb](https://orchid-project.org/data/databases/sgte-binary/IrMo-20Hua.tdb): FCC_A1, type code %A, sha256 `459a311c8def4706…` ~~~~text 30: PHASE FCC_A1 %A 2 1 1 ! 31: CONST FCC_A1 : IR% MO : VA : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.2298/JMMB190211001H](https://doi.org/10.2298/JMMB190211001H) Y.-Y. Huang, B. Wu, F. Li, L.-L. Chen, Z.-X. Deng, K. Chang, J. Mining Metall. B, 56, 109-18(2020). _assessment that models this phase_ ## HCP_A3 (Ir–Mo) - Id: `phase:ir-mo: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: not stable in 1 calculated diagram(s) - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ir-mo:hcp-a3) Names (2): _corpus: _corpus:phase:ir-mo:hcp-a3 _tdb: _tdb:IrMo-20Hua.tdb:HCP_A3 ### TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written [IrMo-20Hua.tdb](https://orchid-project.org/data/databases/sgte-binary/IrMo-20Hua.tdb): HCP_A3, type code %A, sha256 `459a311c8def4706…` ~~~~text 40: PHASE HCP_A3 %A 2 1 0.5 ! 41: CONST HCP_A3 : IR MO : VA: ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.2298/JMMB190211001H](https://doi.org/10.2298/JMMB190211001H) Y.-Y. Huang, B. Wu, F. Li, L.-L. Chen, Z.-X. Deng, K. Chang, J. Mining Metall. B, 56, 109-18(2020). _assessment that models this phase_ ## IR3MO_D019 (Ir–Mo) - Id: `phase:ir-mo:ir3mo-d019`; status `assigned` - Structure: Ni3Sn · D0_19 · hP8 · P6_3/mmc (194); type `st:d0-19-ni3sn-hp8`; tier A: standard phase name; confidence high - Caveat: partitioned order/disorder model in IrMo-20Hua.tdb also describes the disordered state - Stability: stable in 1 of 1 calculated diagram(s): 300–2566.3 K, x(Mo) 0.20449–0.42924 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ir-mo:ir3mo-d019) Names (2): _corpus: _corpus:phase:ir-mo:ir3mo-d019 _tdb: _tdb:IrMo-20Hua.tdb:IR3MO_D019 ### TDB models of IR3MO_D019 (1): PHASE and CONSTITUENT statements as written [IrMo-20Hua.tdb](https://orchid-project.org/data/databases/sgte-binary/IrMo-20Hua.tdb): IR3MO_D019, type code %, sha256 `459a311c8def4706…` ~~~~text 45: PHASE IR3MO_D019 % 2 3 1 ! 46: CONST IR3MO_D019 : IR% MO : IR MO% : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.2298/JMMB190211001H](https://doi.org/10.2298/JMMB190211001H) Y.-Y. Huang, B. Wu, F. Li, L.-L. Chen, Z.-X. Deng, K. Chang, J. Mining Metall. B, 56, 109-18(2020). _assessment that models this phase_ ## IR3MO7_D8B (Ir–Mo) - Id: `phase:ir-mo:ir3mo7-d8b`; status `needs_review` - No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_D8_b; stoichiometry_contradicts_D8_b:IrMo-20Hua.tdb - Candidate (name_token): sigma-CrFe · D8_b · tP30 · P4_2/mnm (136) — Strukturbericht/word 'D8B' in the TDB name - Candidate (sgte_mmc2): sigma-CrFe · D8_b · tP30 · P4_2/mnm (136) — Hallstedt 2025 mmc2 row for IR3MO7_D8B: Ir3Mo7 - Candidate (tdb_comment): CrFe · tP30 · P4_2/mnm — IrMo-20Hua.tdb: 'Prototype CrFe (tP30, P4_2/mnm), sigma' - Stoichiometry: Ir 0.2833, Mo 0.7167 - Stability: stable in 1 of 1 calculated diagram(s): 2200–2362.52 K, x(Mo) 0.71667–0.71667 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ir-mo:ir3mo7-d8b) Names (2): _corpus: _corpus:phase:ir-mo:ir3mo7-d8b _tdb: _tdb:IrMo-20Hua.tdb:IR3MO7_D8B ### TDB models of IR3MO7_D8B (1): PHASE and CONSTITUENT statements as written [IrMo-20Hua.tdb](https://orchid-project.org/data/databases/sgte-binary/IrMo-20Hua.tdb): IR3MO7_D8B, type code %, sha256 `459a311c8def4706…` ~~~~text 60: PHASE IR3MO7_D8B % 2 17 43 ! 61: CONST IR3MO7_D8B : IR : MO : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.2298/JMMB190211001H](https://doi.org/10.2298/JMMB190211001H) Y.-Y. Huang, B. Wu, F. Li, L.-L. Chen, Z.-X. Deng, K. Chang, J. Mining Metall. B, 56, 109-18(2020). _assessment that models this phase_ ## IRMO_A3 (Ir–Mo) - Id: `phase:ir-mo:irmo-a3`; status `needs_review` - No structure assigned. Why: assessment_declared_blocked_by:order_disorder_ambiguity; order_disorder_ambiguity:IrMo-20Hua.tdb_model_is_partitioned - Candidate (dft_mp): Pmma (51) — on-hull MP MoIr at x(MO)=0.5000 - Candidate (dft_oqmd): Pmma (51) — on-hull OQMD Ir1 Mo1 at x(MO)=0.5000 - Candidate (dft_oqmd): Amm2 (38) — on-hull OQMD Ir5 Mo3 at x(MO)=0.3750 - Candidate (name_token): Mg · A3 · hP2 · P6_3/mmc (194) — Strukturbericht/word 'A3' in the TDB name - Candidate (sgte_mmc2): Mg · A3 · hP2 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for IRMO_A3: IrMo (high T) - Candidate (tdb_comment): Mg · hP2 · P6_3/mmc — IrMo-20Hua.tdb: 'Prototype Mg (hP2, P6_3/mmc), epsilon, this is hcp!' - Stability: stable in 1 of 1 calculated diagram(s): 1749.92–2572.01 K, x(Mo) 0.31203–0.61781 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ir-mo:irmo-a3) Names (2): _corpus: _corpus:phase:ir-mo:irmo-a3 _tdb: _tdb:IrMo-20Hua.tdb:IRMO_A3 ### TDB models of IRMO_A3 (1): PHASE and CONSTITUENT statements as written [IrMo-20Hua.tdb](https://orchid-project.org/data/databases/sgte-binary/IrMo-20Hua.tdb): IRMO_A3, type code %, sha256 `459a311c8def4706…` ~~~~text 55: PHASE IRMO_A3 % 2 1 1 ! 56: CONST IRMO_A3 : IR% MO : IR MO% : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.2298/JMMB190211001H](https://doi.org/10.2298/JMMB190211001H) Y.-Y. Huang, B. Wu, F. Li, L.-L. Chen, Z.-X. Deng, K. Chang, J. Mining Metall. B, 56, 109-18(2020). _assessment that models this phase_ ## IRMO_B19 (Ir–Mo) - Id: `phase:ir-mo:irmo-b19`; status `assigned` - Structure: AuCd · B19 · oP4 · Pmma (51); type `st:b19-aucd-op4`; tier A: standard phase name; confidence high - Caveat: DFT agrees: on-hull mp-aaaaaqzp and oqmd-17498, space group 51 - Stoichiometry: Ir 0.5000, Mo 0.5000 - Stability: stable in 1 of 1 calculated diagram(s): 300–1794.77 K, x(Mo) 0.5–0.5 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ir-mo:irmo-b19) Names (4): _corpus: _corpus:phase:ir-mo:irmo-b19 _mp: _mp:mp-aaaaaqzp _oqmd: _oqmd:oqmd-17498 _tdb: _tdb:IrMo-20Hua.tdb:IRMO_B19 ### TDB models of IRMO_B19 (1): PHASE and CONSTITUENT statements as written [IrMo-20Hua.tdb](https://orchid-project.org/data/databases/sgte-binary/IrMo-20Hua.tdb): IRMO_B19, type code %, sha256 `459a311c8def4706…` ~~~~text 50: PHASE IRMO_B19 % 2 1 1 ! 51: CONST IRMO_B19 : IR : MO : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.2298/JMMB190211001H](https://doi.org/10.2298/JMMB190211001H) Y.-Y. Huang, B. Wu, F. Li, L.-L. Chen, Z.-X. Deng, K. Chang, J. Mining Metall. B, 56, 109-18(2020). _assessment that models this phase_ ## IRMO3_A15 (Ir–Mo) - Id: `phase:ir-mo:irmo3-a15`; status `assigned` - Structure: Cr3Si · A15 · cP8 · Pm-3n (223); type `st:a15-cr3si-cp8`; tier A: standard phase name; confidence high - Caveat: partitioned order/disorder model in IrMo-20Hua.tdb also describes the disordered state - Stability: stable in 1 of 1 calculated diagram(s): 663.97–2388.79 K, x(Mo) 0.74174–0.78648 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ir-mo:irmo3-a15) Names (2): _corpus: _corpus:phase:ir-mo:irmo3-a15 _tdb: _tdb:IrMo-20Hua.tdb:IRMO3_A15 ### TDB models of IRMO3_A15 (1): PHASE and CONSTITUENT statements as written [IrMo-20Hua.tdb](https://orchid-project.org/data/databases/sgte-binary/IrMo-20Hua.tdb): IRMO3_A15, type code %, sha256 `459a311c8def4706…` ~~~~text 65: PHASE IRMO3_A15 % 2 1 3 ! 66: CONST IRMO3_A15 : IR% MO : IR MO% : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.2298/JMMB190211001H](https://doi.org/10.2298/JMMB190211001H) Y.-Y. Huang, B. Wu, F. Li, L.-L. Chen, Z.-X. Deng, K. Chang, J. Mining Metall. B, 56, 109-18(2020). _assessment that models this phase_ ## LIQUID (Ir–Mo) - Id: `phase:ir-mo:liquid`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: stable in 1 of 1 calculated diagram(s): 2355.85–4000 K, x(Mo) 0–1 - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:ir-mo:liquid) Names (2): _corpus: _corpus:phase:ir-mo:liquid _tdb: _tdb:IrMo-20Hua.tdb:LIQUID ### TDB models of LIQUID (1): PHASE and CONSTITUENT statements as written [IrMo-20Hua.tdb](https://orchid-project.org/data/databases/sgte-binary/IrMo-20Hua.tdb): LIQUID, type code %, sha256 `459a311c8def4706…` ~~~~text 25: PHASE LIQUID:L % 1 1 ! 26: CONST LIQUID:L : IR MO : ! ~~~~ Example references (1 of 1; assessments first): - [doi:10.2298/JMMB190211001H](https://doi.org/10.2298/JMMB190211001H) Y.-Y. Huang, B. Wu, F. Li, L.-L. Chen, Z.-X. Deng, K. Chang, J. Mining Metall. B, 56, 109-18(2020). _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).