Be–Hf phases

7 phases (tier A 5, tier C 1, 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 · full JSON · Be–Hf system page · Markdown · field reference

Phases of the Be–Hf system (7)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:be-hf:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1526.98–3999.73 K, x(Hf) 0–1	1
BE17HF2 phase:be-hf:be17hf2	Th2Zn17 · hR19 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2174.33 K, x(Hf) 0.10526–0.10526	1
BE2HF_C32 phase:be-hf:be2hf-c32	AlB2 · C32 · hP3 · P6/mmm (191)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1639.58 K, x(Hf) 0.33333–0.33333	1
BE5HF_D2D phase:be-hf:be5hf-d2d	CaCu5 · D2_d · hP6 · P6/mmm (191)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1885.74 K, x(Hf) 0.16667–0.16667	1
FCC_A1 phase:be-hf:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
HCP_A3 phase:be-hf: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(Hf) 0–1	1
LIQUID phase:be-hf:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1415.02–4000 K, x(Hf) 0–1	1

BCC_A2 (Be–Hf)

Id: phase:be-hf: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): 1526.98–3999.73 K, x(Hf) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-hf:bcc-a2
tdb: tdb:BeHf-85Sau.tdb:BCC_A2

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

BeHf-85Sau.tdb: BCC_A2, type code %B, sha256 0c6236a0a4eadf3c…

31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : BE% HF% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase

BE17HF2 (Be–Hf)

Id: phase:be-hf:be17hf2; status assigned
Structure: Th2Zn17 · hR19 · R-3m (166); type st:th2zn17-hr19; 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 (mp_oqmd_space_groups_differ, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Be 0.8947, Hf 0.1053
Stability: stable in 1 of 1 calculated diagram(s): 300–2174.33 K, x(Hf) 0.10526–0.10526
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-hf:be17hf2
tdb: tdb:BeHf-85Sau.tdb:BE17HF2

TDB models of BE17HF2 (1): PHASE and CONSTITUENT statements as written

BeHf-85Sau.tdb: BE17HF2, type code %, sha256 0c6236a0a4eadf3c…

41: PHASE BE17HF2 % 2 17 2 !
42: CONST BE17HF2 : BE : HF : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase

BE2HF_C32 (Be–Hf)

Id: phase:be-hf:be2hf-c32; status assigned
Structure: AlB2 · C32 · hP3 · P6/mmm (191); type st:c32-alb2-hp3; tier A: standard phase name; confidence high
Stoichiometry: Be 0.6667, Hf 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1639.58 K, x(Hf) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-hf:be2hf-c32
tdb: tdb:BeHf-85Sau.tdb:BE2HF_C32

TDB models of BE2HF_C32 (1): PHASE and CONSTITUENT statements as written

BeHf-85Sau.tdb: BE2HF_C32, type code %, sha256 0c6236a0a4eadf3c…

51: PHASE BE2HF_C32 % 2 2 1 !
52: CONST BE2HF_C32 : BE : HF : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase

BE5HF_D2D (Be–Hf)

Id: phase:be-hf:be5hf-d2d; status assigned
Structure: CaCu5 · D2_d · hP6 · P6/mmm (191); type st:d2-d-cacu5-hp6; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaczx and oqmd-10884, space group 191
Stoichiometry: Be 0.8333, Hf 0.1667
Stability: stable in 1 of 1 calculated diagram(s): 300–1885.74 K, x(Hf) 0.16667–0.16667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:be-hf:be5hf-d2d
mp: mp:mp-aaaaaczx
oqmd: oqmd:oqmd-10884
tdb: tdb:BeHf-85Sau.tdb:BE5HF_D2D

TDB models of BE5HF_D2D (1): PHASE and CONSTITUENT statements as written

BeHf-85Sau.tdb: BE5HF_D2D, type code %, sha256 0c6236a0a4eadf3c…

46: PHASE BE5HF_D2D % 2 5 1 !
47: CONST BE5HF_D2D : BE : HF : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase

FCC_A1 (Be–Hf)

Id: phase:be-hf: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 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-hf:fcc-a1
tdb: tdb:BeHf-85Sau.tdb:FCC_A1

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

BeHf-85Sau.tdb: FCC_A1, type code %A, sha256 0c6236a0a4eadf3c…

26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : BE HF : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase

HCP_A3 (Be–Hf)

Id: phase:be-hf: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(Hf) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-hf:hcp-a3
tdb: tdb:BeHf-85Sau.tdb:HCP_A3

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

BeHf-85Sau.tdb: HCP_A3, type code %A, sha256 0c6236a0a4eadf3c…

36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : BE% HF% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
assessment that models this phase

LIQUID (Be–Hf)

Id: phase:be-hf:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1415.02–4000 K, x(Hf) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-hf:liquid
tdb: tdb:BeHf-85Sau.tdb:LIQUID

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

BeHf-85Sau.tdb: LIQUID, type code %, sha256 0c6236a0a4eadf3c…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : BE HF : !

Example references (1 of 1; assessments first):

doi:10.1016/0364-5916(85)90001-X N. Saunders, Calphad, 9, 297-309(1985).
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}
}