B–Lu phases

10 phases (tier A 6, tier C 1, 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 · B–Lu system page · Markdown · field reference

Phases of the B–Lu system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
ALPHA_RHOMBO_B phase:b-lu:b-alpha-rhombo		needs_review	stable in 1 of 1 calculated diagram(s): 300–1388 K, x(B) 1–1	0	1
BETA_RHOMBO_B phase:b-lu:b-beta-rhombo		needs_review	stable in 1 of 1 calculated diagram(s): 1388–2350.67 K, x(B) 1–1	2	1
BCC_A2 phase:b-lu:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
FCC_A1 phase:b-lu:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
HCP_A3 phase:b-lu:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–3999.75 K, x(B) 0–0.00087	2	1
LIQUID phase:b-lu:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1767.35–4000 K, x(B) 0–1	12	1
LUB12_D2F phase:b-lu:lub12-d2f	UB12 · D2_f · cF52 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2449.26 K, x(B) 0.92308–0.92308	4	1
LUB2_C32 phase:b-lu:lub2-c32	AlB2 · C32 · hP3 · P6/mmm (191)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2524.98 K, x(B) 0.66667–0.66667	4	1
LUB4_D1E phase:b-lu:lub4-d1e	UB4 · D1_e · tP20 · P4/mbm (127)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2873.35 K, x(B) 0.8–0.8	6	1
LUB66 phase:b-lu:lub66	YB66 · cF1936 · Fm-3c (226)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2380.33 K, x(B) 0.98507–0.98507	5	1

ALPHA_RHOMBO_B (B–Lu)

Id: phase:b-lu: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 — LuB-20Li.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-lu:b-alpha-rhombo
tdb: tdb:LuB-20Li.tdb:ALPHA_RHOMBO_B

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

LuB-20Li.tdb: ALPHA_RHOMBO_B, type code %, sha256 209af1f02647e3d6…

40: PHASE ALPHA_RHOMBO_B % 1 1 !
41: CONST ALPHA_RHOMBO_B : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101740 S. Li, M.H. Rong, L. Xu, Q. Wei, J. Wang, G.H. Rao et al., Thermodynamic assessment of the RE-B (RE = Ce, Dy, Lu) binary systems, Calphad 68, 101740 (2020).
assessment that models this phase

BETA_RHOMBO_B (B–Lu)

Id: phase:b-lu: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 — LuB-20Li.tdb: 'Prototype beta-B (hR105, R-3m)'
Stoichiometry: B 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 1388–2350.67 K, x(B) 1–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:b-lu:b-beta-rhombo, corpus:phase:b-lu:beta-rhombo-b
paper: paper:10.1016/j.calphad.2020.101740:β-B
tdb: tdb:LuB-20Li.tdb:BETA_RHOMBO_B

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

LuB-20Li.tdb: BETA_RHOMBO_B, type code %, sha256 209af1f02647e3d6…

45: PHASE BETA_RHOMBO_B % 1 1 !
46: CONST BETA_RHOMBO_B : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101740 S. Li, M.H. Rong, L. Xu, Q. Wei, J. Wang, G.H. Rao et al., Thermodynamic assessment of the RE-B (RE = Ce, Dy, Lu) binary systems, Calphad 68, 101740 (2020).
assessment that models this phase; reports values for this phase

BCC_A2 (B–Lu)

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

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

LuB-20Li.tdb: BCC_A2, type code %B, sha256 209af1f02647e3d6…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : B : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101740 S. Li, M.H. Rong, L. Xu, Q. Wei, J. Wang, G.H. Rao et al., Thermodynamic assessment of the RE-B (RE = Ce, Dy, Lu) binary systems, Calphad 68, 101740 (2020).
assessment that models this phase

FCC_A1 (B–Lu)

Id: phase:b-lu:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: B 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-lu:fcc-a1
tdb: tdb:LuB-20Li.tdb:FCC_A1

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

LuB-20Li.tdb: FCC_A1, type code %A, sha256 209af1f02647e3d6…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : B : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101740 S. Li, M.H. Rong, L. Xu, Q. Wei, J. Wang, G.H. Rao et al., Thermodynamic assessment of the RE-B (RE = Ce, Dy, Lu) binary systems, Calphad 68, 101740 (2020).
assessment that models this phase

HCP_A3 (B–Lu)

Id: phase:b-lu: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): 300–3999.75 K, x(B) 0–0.00087
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-lu:hcp-a3
paper: paper:10.1016/j.calphad.2020.101740:α-Lu
tdb: tdb:LuB-20Li.tdb:HCP_A3

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

LuB-20Li.tdb: HCP_A3, type code %A, sha256 209af1f02647e3d6…

35: PHASE HCP_A3 %A 2 1 0.5 !
36: CONST HCP_A3 : B LU% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101740 S. Li, M.H. Rong, L. Xu, Q. Wei, J. Wang, G.H. Rao et al., Thermodynamic assessment of the RE-B (RE = Ce, Dy, Lu) binary systems, Calphad 68, 101740 (2020).
assessment that models this phase; reports values for this phase

LIQUID (B–Lu)

Id: phase:b-lu:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1767.35–4000 K, x(B) 0–1
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-lu:liquid
paper: paper:10.1016/j.calphad.2020.101740:L
tdb: tdb:LuB-20Li.tdb:LIQUID

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

LuB-20Li.tdb: LIQUID, type code %, sha256 209af1f02647e3d6…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : B LU : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101740 S. Li, M.H. Rong, L. Xu, Q. Wei, J. Wang, G.H. Rao et al., Thermodynamic assessment of the RE-B (RE = Ce, Dy, Lu) binary systems, Calphad 68, 101740 (2020).
assessment that models this phase; reports values for this phase

LUB12_D2F (B–Lu)

Id: phase:b-lu:lub12-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-aaackvor and oqmd-28503, space group 225
Stoichiometry: B 0.9231, Lu 0.0769
Stability: stable in 1 of 1 calculated diagram(s): 300–2449.26 K, x(B) 0.92308–0.92308
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:b-lu:lub12-d2f
mp: mp:mp-aaackvor
oqmd: oqmd:oqmd-28503
paper: paper:10.1016/j.calphad.2020.101740:LuB12
tdb: tdb:LuB-20Li.tdb:LUB12_D2F

TDB models of LUB12_D2F (1): PHASE and CONSTITUENT statements as written

LuB-20Li.tdb: LUB12_D2F, type code %, sha256 209af1f02647e3d6…

60: PHASE LUB12_D2F % 2 1 12 !
61: CONST LUB12_D2F : LU : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101740 S. Li, M.H. Rong, L. Xu, Q. Wei, J. Wang, G.H. Rao et al., Thermodynamic assessment of the RE-B (RE = Ce, Dy, Lu) binary systems, Calphad 68, 101740 (2020).
assessment that models this phase; reports values for this phase

LUB2_C32 (B–Lu)

Id: phase:b-lu:lub2-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-aaaaaqpn and oqmd-115218, space group 191
Stoichiometry: B 0.6667, Lu 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–2524.98 K, x(B) 0.66667–0.66667
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:b-lu:lub2-c32
mp: mp:mp-aaaaaqpn
oqmd: oqmd:oqmd-115218
paper: paper:10.1016/j.calphad.2020.101740:LuB2
tdb: tdb:LuB-20Li.tdb:LUB2_C32

TDB models of LUB2_C32 (1): PHASE and CONSTITUENT statements as written

LuB-20Li.tdb: LUB2_C32, type code %, sha256 209af1f02647e3d6…

50: PHASE LUB2_C32 % 2 1 2 !
51: CONST LUB2_C32 : LU : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101740 S. Li, M.H. Rong, L. Xu, Q. Wei, J. Wang, G.H. Rao et al., Thermodynamic assessment of the RE-B (RE = Ce, Dy, Lu) binary systems, Calphad 68, 101740 (2020).
assessment that models this phase; reports values for this phase

LUB4_D1E (B–Lu)

Id: phase:b-lu:lub4-d1e; status assigned
Structure: UB4 · D1_e · tP20 · P4/mbm (127); type st:d1-e-ub4-tp20; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaabgnkp and oqmd-19137, space group 127
Stoichiometry: B 0.8000, Lu 0.2000
Stability: stable in 1 of 1 calculated diagram(s): 300–2873.35 K, x(B) 0.8–0.8
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:b-lu:lub4-d1e
mp: mp:mp-aaabgnkp
oqmd: oqmd:oqmd-19137
paper: paper:10.1016/j.calphad.2020.101740:LuB4
tdb: tdb:LuB-20Li.tdb:LUB4_D1E

TDB models of LUB4_D1E (1): PHASE and CONSTITUENT statements as written

LuB-20Li.tdb: LUB4_D1E, type code %, sha256 209af1f02647e3d6…

55: PHASE LUB4_D1E % 2 1 4 !
56: CONST LUB4_D1E : LU : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101740 S. Li, M.H. Rong, L. Xu, Q. Wei, J. Wang, G.H. Rao et al., Thermodynamic assessment of the RE-B (RE = Ce, Dy, Lu) binary systems, Calphad 68, 101740 (2020).
assessment that models this phase; reports values for this phase

LUB66 (B–Lu)

Id: phase:b-lu:lub66; 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, Lu 0.0149
Stability: stable in 1 of 1 calculated diagram(s): 300–2380.33 K, x(B) 0.98507–0.98507
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-lu:lub66
paper: paper:10.1016/j.calphad.2020.101740:LuB66
tdb: tdb:LuB-20Li.tdb:LUB66

TDB models of LUB66 (1): PHASE and CONSTITUENT statements as written

LuB-20Li.tdb: LUB66, type code %, sha256 209af1f02647e3d6…

65: PHASE LUB66 % 2 1 66 !
66: CONST LUB66 : LU : B : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2020.101740 S. Li, M.H. Rong, L. Xu, Q. Wei, J. Wang, G.H. Rao et al., Thermodynamic assessment of the RE-B (RE = Ce, Dy, Lu) binary systems, Calphad 68, 101740 (2020).
assessment that models this phase; reports values for 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}
}