B–Ho phases

10 phases (tier A 6, tier C 1, liquid 1, needs_review 2); 9 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 · Markdown · field reference

Phases of the B–Ho system (10)
Phase	Structure	Basis	Stability (calculated)	TDB models
ALPHA_RHOMBO_B phase:b-ho:b-alpha-rhombo		needs_review	stable in 1 of 1 calculated diagram(s): 300–1388 K, x(B) 1–1	1
BETA_RHOMBO_B phase:b-ho:b-beta-rhombo		needs_review	stable in 1 of 1 calculated diagram(s): 1388–2353.29 K, x(B) 1–1	1
BCC_A2 phase:b-ho:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
HCP_A3 phase:b-ho:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1754 K, x(B) 0–0	1
HOB12_D2F phase:b-ho:hob12-d2f	UB12 · D2_f · cF52 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2372.51 K, x(B) 0.92308–0.92308	1
HOB2_C32 phase:b-ho:hob2-c32	AlB2 · C32 · hP3 · P6/mmm (191)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2476.14 K, x(B) 0.66667–0.66667	1
HOB4_D1E phase:b-ho:hob4-d1e	UB4 · D1_e · tP20 · P4/mbm (127)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2773.52 K, x(B) 0.8–0.8	1
HOB6_D21 phase:b-ho:hob6-d21	CaB6 · D2_1 · cP7 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2453.4 K, x(B) 0.85714–0.85714	1
HOB66 phase:b-ho:hob66	YB66 · cF1936 · Fm-3c (226)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2339.45 K, x(B) 0.98507–0.98507	1
LIQUID phase:b-ho:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1717.07–4000 K, x(B) 0–1	1

ALPHA_RHOMBO_B (B–Ho)

Id: phase:b-ho:b-alpha-rhombo; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:RHOMBO; no_structure_token
Candidate (sgte_mmc2): alpha-B · hR12 · R-3m (166) — Hallstedt 2025 mmc2 row for ALPHA_RHOMBO_B: Si_nB
Candidate (tdb_comment): alpha-B · hR12 · R-3m — HoB-20Wei.tdb: 'Prototype alpha-B (hR12, R-3m)'
Stoichiometry: B 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1388 K, x(B) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-ho:b-alpha-rhombo
tdb: tdb:HoB-20Wei.tdb:ALPHA_RHOMBO_B

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

HoB-20Wei.tdb: ALPHA_RHOMBO_B, type code %, sha256 2e0ce826e6e1fe99…

38: PHASE ALPHA_RHOMBO_B % 1 1 !
39: CONST ALPHA_RHOMBO_B : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

BETA_RHOMBO_B (B–Ho)

Id: phase:b-ho:b-beta-rhombo; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:RHOMBO; no_structure_token
Candidate (sgte_mmc2): beta-B · hR105 · R-3m (166) — Hallstedt 2025 mmc2 row for BETA_RHOMBO_B: beta-B
Candidate (tdb_comment): beta-B · hR105 · R-3m — HoB-20Wei.tdb: 'Prototype beta-B (hR105, R-3m)'
Stoichiometry: B 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 1388–2353.29 K, x(B) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-ho:b-beta-rhombo
tdb: tdb:HoB-20Wei.tdb:BETA_RHOMBO_B

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

HoB-20Wei.tdb: BETA_RHOMBO_B, type code %, sha256 2e0ce826e6e1fe99…

43: PHASE BETA_RHOMBO_B % 1 1 !
44: CONST BETA_RHOMBO_B : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

BCC_A2 (B–Ho)

Id: phase:b-ho:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stoichiometry: Ho 1.0000
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:b-ho:bcc-a2
tdb: tdb:HoB-20Wei.tdb:BCC_A2

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

HoB-20Wei.tdb: BCC_A2, type code %B, sha256 2e0ce826e6e1fe99…

28: PHASE BCC_A2 %B 2 1 3 !
29: CONST BCC_A2 : HO : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

HCP_A3 (B–Ho)

Id: phase:b-ho:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stoichiometry: Ho 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1754 K, x(B) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-ho:hcp-a3
tdb: tdb:HoB-20Wei.tdb:HCP_A3

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

HoB-20Wei.tdb: HCP_A3, type code %A, sha256 2e0ce826e6e1fe99…

33: PHASE HCP_A3 %A 2 1 0.5 !
34: CONST HCP_A3 : HO : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

HOB12_D2F (B–Ho)

Id: phase:b-ho:hob12-d2f; status assigned
Structure: UB12 · D2_f · cF52 · Fm-3m (225); type st:d2-f-ub12-cf52; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaackwab and oqmd-28455, space group 225
Stoichiometry: B 0.9231, Ho 0.0769
Stability: stable in 1 of 1 calculated diagram(s): 300–2372.51 K, x(B) 0.92308–0.92308
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:b-ho:hob12-d2f
mp: mp:mp-aaackwab
oqmd: oqmd:oqmd-28455
tdb: tdb:HoB-20Wei.tdb:HOB12_D2F

TDB models of HOB12_D2F (1): PHASE and CONSTITUENT statements as written

HoB-20Wei.tdb: HOB12_D2F, type code %, sha256 2e0ce826e6e1fe99…

63: PHASE HOB12_D2F % 2 1 12 !
64: CONST HOB12_D2F : HO : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

HOB2_C32 (B–Ho)

Id: phase:b-ho:hob2-c32; status assigned
Structure: AlB2 · C32 · hP3 · P6/mmm (191); type st:c32-alb2-hp3; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaadjf and oqmd-8366, space group 191
Stoichiometry: B 0.6667, Ho 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–2476.14 K, x(B) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:b-ho:hob2-c32
mp: mp:mp-aaaaadjf
oqmd: oqmd:oqmd-8366
tdb: tdb:HoB-20Wei.tdb:HOB2_C32

TDB models of HOB2_C32 (1): PHASE and CONSTITUENT statements as written

HoB-20Wei.tdb: HOB2_C32, type code %, sha256 2e0ce826e6e1fe99…

48: PHASE HOB2_C32 % 2 1 2 !
49: CONST HOB2_C32 : HO : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

HOB4_D1E (B–Ho)

Id: phase:b-ho:hob4-d1e; status assigned
Structure: UB4 · D1_e · tP20 · P4/mbm (127); type st:d1-e-ub4-tp20; tier A: standard phase name; confidence high
Stoichiometry: B 0.8000, Ho 0.2000
Stability: stable in 1 of 1 calculated diagram(s): 300–2773.52 K, x(B) 0.8–0.8
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-ho:hob4-d1e
tdb: tdb:HoB-20Wei.tdb:HOB4_D1E

TDB models of HOB4_D1E (1): PHASE and CONSTITUENT statements as written

HoB-20Wei.tdb: HOB4_D1E, type code %, sha256 2e0ce826e6e1fe99…

53: PHASE HOB4_D1E % 2 1 4 !
54: CONST HOB4_D1E : HO : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

HOB6_D21 (B–Ho)

Id: phase:b-ho:hob6-d21; status assigned
Structure: CaB6 · D2_1 · cP7 · Pm-3m (221); type st:d2-1-cab6-cp7; tier A: standard phase name; confidence high
Stoichiometry: B 0.8571, Ho 0.1429
Stability: stable in 1 of 1 calculated diagram(s): 300–2453.4 K, x(B) 0.85714–0.85714
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-ho:hob6-d21
tdb: tdb:HoB-20Wei.tdb:HOB6_D21

TDB models of HOB6_D21 (1): PHASE and CONSTITUENT statements as written

HoB-20Wei.tdb: HOB6_D21, type code %, sha256 2e0ce826e6e1fe99…

58: PHASE HOB6_D21 % 2 1 6 !
59: CONST HOB6_D21 : HO : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

HOB66 (B–Ho)

Id: phase:b-ho:hob66; status assigned
Structure: YB66 · cF1936 · Fm-3c (226); type st:yb66-cf1936; 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_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: B 0.9851, Ho 0.0149
Stability: stable in 1 of 1 calculated diagram(s): 300–2339.45 K, x(B) 0.98507–0.98507
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-ho:hob66
tdb: tdb:HoB-20Wei.tdb:HOB66

TDB models of HOB66 (1): PHASE and CONSTITUENT statements as written

HoB-20Wei.tdb: HOB66, type code %, sha256 2e0ce826e6e1fe99…

68: PHASE HOB66 % 2 1 66 !
69: CONST HOB66 : HO : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(2020).
assessment that models this phase

LIQUID (B–Ho)

Id: phase:b-ho:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1717.07–4000 K, x(B) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:b-ho:liquid
tdb: tdb:HoB-20Wei.tdb:LIQUID

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

HoB-20Wei.tdb: LIQUID, type code %, sha256 2e0ce826e6e1fe99…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : B HO : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101796 Q. Wei, M.H. Rong, S. Li, D. Su, Q.R. Yao, J. Wang, G.H. Rao, H.Y. Zhou, Calphad, 70, 101796(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}
}