Ir–Mo phases

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 · full JSON · Ir–Mo system page · Markdown · field reference

Phases of the Ir–Mo system (9)
Phase	Structure	Basis	Stability (calculated)	TDB models
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	1
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	1
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)	1
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	1
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	1
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	1
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	1
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	1
LIQUID phase:ir-mo:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 2355.85–4000 K, x(Mo) 0–1	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

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: BCC_A2, type code %B, sha256 459a311c8def4706…

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 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

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: FCC_A1, type code %A, sha256 459a311c8def4706…

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 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

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: HCP_A3, type code %A, sha256 459a311c8def4706…

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 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

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: IR3MO_D019, type code %, sha256 459a311c8def4706…

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 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

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: IR3MO7_D8B, type code %, sha256 459a311c8def4706…

60: PHASE IR3MO7_D8B %  2 17 43 !
61: CONST IR3MO7_D8B : IR : MO : !

Example references (1 of 1; assessments first):

doi: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

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: IRMO_A3, type code %, sha256 459a311c8def4706…

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 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

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: IRMO_B19, type code %, sha256 459a311c8def4706…

50: PHASE IRMO_B19 %  2 1 1 !
51: CONST IRMO_B19 : IR : MO : !

Example references (1 of 1; assessments first):

doi: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

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: IRMO3_A15, type code %, sha256 459a311c8def4706…

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 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

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: LIQUID, type code %, sha256 459a311c8def4706…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : IR MO : !

Example references (1 of 1; assessments first):

doi: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). 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}
}