Hf–Ir phases

10 phases (tier A 6, tier B 1, tier C 1, liquid 1, needs_review 1); 10 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 · Hf–Ir system page · Markdown · field reference

Phases of the Hf–Ir system (10)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:hf-ir:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1674.39–2506 K, x(Ir) 0–0.0617	1
FCC_A1 phase:hf-ir:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2724.52 K, x(Ir) 0.92834–1	1
HCP_A3 phase:hf-ir:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2016.02 K, x(Ir) 0–0.01304	1
HF2IR phase:hf-ir:hf2ir	NiTi2 · cF96 · Fd-3m (227)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1997.83 K, x(Ir) 0.28359–0.33333	1
HF5IR3 phase:hf-ir:hf5ir3	Ir3Zr5 · hP48 · P6_122 (178)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–2193.99 K, x(Ir) 0.375–0.375	1
HFIR_ALPHA phase:hf-ir:hfir-alpha		needs_review	stable in 1 of 1 calculated diagram(s): 300–1237.16 K, x(Ir) 0.47983–0.48001	1
HFIR_B2 phase:hf-ir:hfir-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1219.38–2707.64 K, x(Ir) 0.48762–0.5063	1
HFIR_L10 phase:hf-ir:hfir-l10	AuCu · L1_0 · tP4 · P4/mmm (123)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 917.21–1219.51 K, x(Ir) 0.49998–0.50013	1
HFIR3_L12 phase:hf-ir:hfir3-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2738.88 K, x(Ir) 0.74997–0.81062	1
LIQUID phase:hf-ir:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1735.4–4000 K, x(Ir) 0–1	1

BCC_A2 (Hf–Ir)

Id: phase:hf-ir: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): 1674.39–2506 K, x(Ir) 0–0.0617
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hf-ir:bcc-a2
tdb: tdb:HfIr-18Idb.tdb:BCC_A2

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

HfIr-18Idb.tdb: BCC_A2, type code %B, sha256 37ce1bf38cdad3fb…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : HF% IR : VA : !

Example references (1 of 1; assessments first):

doi:10.1051/metal/2018001 M. Idbenali, C. Servant, M. Feddaoui, Metall. Res. Technol., 115, 503(2018).
assessment that models this phase

FCC_A1 (Hf–Ir)

Id: phase:hf-ir: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): 300–2724.52 K, x(Ir) 0.92834–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hf-ir:fcc-a1
tdb: tdb:HfIr-18Idb.tdb:FCC_A1

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

HfIr-18Idb.tdb: FCC_A1, type code %A, sha256 37ce1bf38cdad3fb…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : HF IR% : VA : !

Example references (1 of 1; assessments first):

doi:10.1051/metal/2018001 M. Idbenali, C. Servant, M. Feddaoui, Metall. Res. Technol., 115, 503(2018).
assessment that models this phase

HCP_A3 (Hf–Ir)

Id: phase:hf-ir: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 1 of 1 calculated diagram(s): 300–2016.02 K, x(Ir) 0–0.01304
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hf-ir:hcp-a3
tdb: tdb:HfIr-18Idb.tdb:HCP_A3

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

HfIr-18Idb.tdb: HCP_A3, type code %A, sha256 37ce1bf38cdad3fb…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : HF% IR : VA : !

Example references (1 of 1; assessments first):

doi:10.1051/metal/2018001 M. Idbenali, C. Servant, M. Feddaoui, Metall. Res. Technol., 115, 503(2018).
assessment that models this phase

HF2IR (Hf–Ir)

Id: phase:hf-ir:hf2ir; status assigned
Structure: NiTi2 · cF96 · Fd-3m (227); type st:niti2-cf96; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 300–1997.83 K, x(Ir) 0.28359–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hf-ir:hf2ir
tdb: tdb:HfIr-18Idb.tdb:HF2IR

TDB models of HF2IR (1): PHASE and CONSTITUENT statements as written

HfIr-18Idb.tdb: HF2IR, type code %, sha256 37ce1bf38cdad3fb…

46: PHASE HF2IR % 2 2 1 !
47: CONST HF2IR : HF : HF IR% : !

Example references (1 of 1; assessments first):

doi:10.1051/metal/2018001 M. Idbenali, C. Servant, M. Feddaoui, Metall. Res. Technol., 115, 503(2018).
assessment that models this phase

HF5IR3 (Hf–Ir)

Id: phase:hf-ir:hf5ir3; status assigned
Structure: Ir3Zr5 · hP48 · P6_122 (178); type st:ir3zr5-hp48; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Hf 0.6250, Ir 0.3750
Stability: stable in 1 of 1 calculated diagram(s): 300–2193.99 K, x(Ir) 0.375–0.375
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:hf-ir:hf5ir3
mp: mp:mp-aaacqzqp
oqmd: oqmd:oqmd-2052706
tdb: tdb:HfIr-18Idb.tdb:HF5IR3

TDB models of HF5IR3 (1): PHASE and CONSTITUENT statements as written

HfIr-18Idb.tdb: HF5IR3, type code %, sha256 37ce1bf38cdad3fb…

51: PHASE HF5IR3 % 2 5 3 !
52: CONST HF5IR3 : HF : IR : !

Example references (1 of 1; assessments first):

doi:10.1051/metal/2018001 M. Idbenali, C. Servant, M. Feddaoui, Metall. Res. Technol., 115, 503(2018).
assessment that models this phase

HFIR_ALPHA (Hf–Ir)

Id: phase:hf-ir:hfir-alpha; status needs_review
No structure assigned. Why: no_structure_token; off_stoichiometric_model
Candidate (sgte_mmc2): (HfIr) · Pmma (51) — Hallstedt 2025 mmc2 row for HFIR_ALPHA: HfIr-alpha
Stability: stable in 1 of 1 calculated diagram(s): 300–1237.16 K, x(Ir) 0.47983–0.48001
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hf-ir:hfir-alpha
tdb: tdb:HfIr-18Idb.tdb:HFIR_ALPHA

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

HfIr-18Idb.tdb: HFIR_ALPHA, type code %, sha256 37ce1bf38cdad3fb…

56: PHASE HFIR_ALPHA % 2 0.52 0.48 !
57: CONST HFIR_ALPHA : HF% IR : HF IR% : !

Example references (1 of 1; assessments first):

doi:10.1051/metal/2018001 M. Idbenali, C. Servant, M. Feddaoui, Metall. Res. Technol., 115, 503(2018).
assessment that models this phase

HFIR_B2 (Hf–Ir)

Id: phase:hf-ir:hfir-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in HfIr-18Idb.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 1219.38–2707.64 K, x(Ir) 0.48762–0.5063
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hf-ir:hfir-b2
tdb: tdb:HfIr-18Idb.tdb:HFIR_B2

TDB models of HFIR_B2 (1): PHASE and CONSTITUENT statements as written

HfIr-18Idb.tdb: HFIR_B2, type code %, sha256 37ce1bf38cdad3fb…

66: PHASE HFIR_B2 % 2 1 1 !
67: CONST HFIR_B2 : HF% IR : HF IR% : !

Example references (1 of 1; assessments first):

doi:10.1051/metal/2018001 M. Idbenali, C. Servant, M. Feddaoui, Metall. Res. Technol., 115, 503(2018).
assessment that models this phase

HFIR_L10 (Hf–Ir)

Id: phase:hf-ir:hfir-l10; status assigned
Structure: AuCu · L1_0 · tP4 · P4/mmm (123); type st:l1-0-aucu-tp4; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in HfIr-18Idb.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 917.21–1219.51 K, x(Ir) 0.49998–0.50013
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hf-ir:hfir-l10
tdb: tdb:HfIr-18Idb.tdb:HFIR_L10

TDB models of HFIR_L10 (1): PHASE and CONSTITUENT statements as written

HfIr-18Idb.tdb: HFIR_L10, type code %, sha256 37ce1bf38cdad3fb…

61: PHASE HFIR_L10 % 2 1 1 !
62: CONST HFIR_L10 : HF% IR : HF IR% : !

Example references (1 of 1; assessments first):

doi:10.1051/metal/2018001 M. Idbenali, C. Servant, M. Feddaoui, Metall. Res. Technol., 115, 503(2018).
assessment that models this phase

HFIR3_L12 (Hf–Ir)

Id: phase:hf-ir:hfir3-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in HfIr-18Idb.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–2738.88 K, x(Ir) 0.74997–0.81062
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hf-ir:hfir3-l12
tdb: tdb:HfIr-18Idb.tdb:HFIR3_L12

TDB models of HFIR3_L12 (1): PHASE and CONSTITUENT statements as written

HfIr-18Idb.tdb: HFIR3_L12, type code %, sha256 37ce1bf38cdad3fb…

71: PHASE HFIR3_L12 % 2 1 3 !
72: CONST HFIR3_L12 : HF% IR : HF IR% : !

Example references (1 of 1; assessments first):

doi:10.1051/metal/2018001 M. Idbenali, C. Servant, M. Feddaoui, Metall. Res. Technol., 115, 503(2018).
assessment that models this phase

LIQUID (Hf–Ir)

Id: phase:hf-ir:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1735.4–4000 K, x(Ir) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:hf-ir:liquid
tdb: tdb:HfIr-18Idb.tdb:LIQUID

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

HfIr-18Idb.tdb: LIQUID, type code %, sha256 37ce1bf38cdad3fb…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : HF IR : !

Example references (1 of 1; assessments first):

doi:10.1051/metal/2018001 M. Idbenali, C. Servant, M. Feddaoui, Metall. Res. Technol., 115, 503(2018).
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}
}