Ir–W phases

8 phases (tier A 6, liquid 1, needs_review 1); 7 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–W system page · Markdown · field reference

Phases of the Ir–W system (8)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:ir-w:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–3999.88 K, x(W) 0.93883–1	1
FCC_A1 phase:ir-w:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2719 K, x(W) 0–0.20837	1
HCP_A3 phase:ir-w:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
IR3W_D019 phase:ir-w:ir3w-d019	Ni3Sn · D0_19 · hP8 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1921.14 K, x(W) 0.16092–0.33617	1
IRW_A3 phase:ir-w:irw-a3		needs_review	stable in 1 of 1 calculated diagram(s): 1507.94–2790 K, x(W) 0.23656–0.60218	1
IRW_B19 phase:ir-w:irw-b19	AuCd · B19 · oP4 · Pmma (51)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1900 K, x(W) 0.47838–0.5	1
IRW3_D8B phase:ir-w:irw3-d8b	sigma-CrFe · D8_b · tP30 · P4_2/mnm (136)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 2074.88–2846.18 K, x(W) 0.74814–0.7995	1
LIQUID phase:ir-w:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 2579.39–4000 K, x(W) 0–1	1

BCC_A2 (Ir–W)

Id: phase:ir-w: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): 300–3999.88 K, x(W) 0.93883–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ir-w:bcc-a2
tdb: tdb:IrW-20Hua.tdb:BCC_A2

TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written

IrW-20Hua.tdb: BCC_A2, type code %B, sha256 ad9a9f3cc83e1154…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : IR W% : 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–W)

Id: phase:ir-w: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): 300–2719 K, x(W) 0–0.20837
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ir-w:fcc-a1
tdb: tdb:IrW-20Hua.tdb:FCC_A1

TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

IrW-20Hua.tdb: FCC_A1, type code %A, sha256 ad9a9f3cc83e1154…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : IR% W : 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–W)

Id: phase:ir-w: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-w:hcp-a3
tdb: tdb:IrW-20Hua.tdb:HCP_A3

TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

IrW-20Hua.tdb: HCP_A3, type code %A, sha256 ad9a9f3cc83e1154…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : IR W : 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

IR3W_D019 (Ir–W)

Id: phase:ir-w:ir3w-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 IrW-20Hua.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–1921.14 K, x(W) 0.16092–0.33617
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ir-w:ir3w-d019
tdb: tdb:IrW-20Hua.tdb:IR3W_D019

TDB models of IR3W_D019 (1): PHASE and CONSTITUENT statements as written

IrW-20Hua.tdb: IR3W_D019, type code %, sha256 ad9a9f3cc83e1154…

45: PHASE IR3W_D019 %  2 3 1 !
46: CONST IR3W_D019 : IR% W : IR W% : !

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

IRW_A3 (Ir–W)

Id: phase:ir-w:irw-a3; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:order_disorder_ambiguity; order_disorder_ambiguity:IrW-20Hua.tdb_model_is_partitioned
Candidate (dft_mp): P6_3/mmc (194) — on-hull MP Ir3W at x(W)=0.2500
Candidate (dft_mp): Pmma (51) — on-hull MP IrW at x(W)=0.5000
Candidate (dft_oqmd): Pmma (51) — on-hull OQMD Ir1 W1 at x(W)=0.5000
Candidate (dft_oqmd): P63/mmc (194) — on-hull OQMD Ir3 W1 at x(W)=0.2500
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 IRW_A3: IrW (high T)
Candidate (tdb_comment): Mg · hP2 · P6_3/mmc — IrW-20Hua.tdb: 'Prototype Mg (hP2, P6_3/mmc), epsilon, this is hcp!'
Stability: stable in 1 of 1 calculated diagram(s): 1507.94–2790 K, x(W) 0.23656–0.60218
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ir-w:irw-a3
tdb: tdb:IrW-20Hua.tdb:IRW_A3

TDB models of IRW_A3 (1): PHASE and CONSTITUENT statements as written

IrW-20Hua.tdb: IRW_A3, type code %, sha256 ad9a9f3cc83e1154…

55: PHASE IRW_A3 %  2 1 1 !
56: CONST IRW_A3 : IR% W : IR W% : !

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

IRW_B19 (Ir–W)

Id: phase:ir-w:irw-b19; status assigned
Structure: AuCd · B19 · oP4 · Pmma (51); type st:b19-aucd-op4; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1900 K, x(W) 0.47838–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ir-w:irw-b19
tdb: tdb:IrW-20Hua.tdb:IRW_B19

TDB models of IRW_B19 (1): PHASE and CONSTITUENT statements as written

IrW-20Hua.tdb: IRW_B19, type code %, sha256 ad9a9f3cc83e1154…

50: PHASE IRW_B19 %  2 1 1 !
51: CONST IRW_B19 : IR : IR W% : !

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

IRW3_D8B (Ir–W)

Id: phase:ir-w:irw3-d8b; status assigned
Structure: sigma-CrFe · D8_b · tP30 · P4_2/mnm (136); type st:d8-b-sigma-crfe-tp30; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in IrW-20Hua.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 2074.88–2846.18 K, x(W) 0.74814–0.7995
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ir-w:irw3-d8b
tdb: tdb:IrW-20Hua.tdb:IRW3_D8B

TDB models of IRW3_D8B (1): PHASE and CONSTITUENT statements as written

IrW-20Hua.tdb: IRW3_D8B, type code %, sha256 ad9a9f3cc83e1154…

60: PHASE IRW3_D8B %  2 1 3 !
61: CONST IRW3_D8B : IR% W : IR W% : !

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–W)

Id: phase:ir-w:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 2579.39–4000 K, x(W) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ir-w:liquid
tdb: tdb:IrW-20Hua.tdb:LIQUID

TDB models of LIQUID (1): PHASE and CONSTITUENT statements as written

IrW-20Hua.tdb: LIQUID, type code %, sha256 ad9a9f3cc83e1154…

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

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}
}