B–Cu phases

5 phases (tier A 3, liquid 1, needs_review 1); 3 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–Cu system page · Markdown · field reference

Phases of the B–Cu system (5)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BETA_RHOMBO_B phase:b-cu:b-beta-rhombo		needs_review	stable in 2 of 2 calculated diagram(s): 300–3999.5 K, x(B) 0.96458–1	6	2
BCC_A2 phase:b-cu:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
FCC_A1 phase:b-cu:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1357.77 K, x(B) 0–0.00357	6	2
HCP_A3 phase:b-cu:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
LIQUID phase:b-cu:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1286.15–4000 K, x(B) 0–1	6	2

BETA_RHOMBO_B (B–Cu)

Id: phase:b-cu: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 — CuB-09Wan.tdb: 'Prototype beta-B (hR105, R-3m)'
Candidate (tdb_comment): beta-B · hR105 · R-3m — CuB-09Zha.tdb: 'Prototype beta-B (hR105, R-3m)'
Stability: stable in 2 of 2 calculated diagram(s): 300–3999.5 K, x(B) 0.96458–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:b-cu:b-beta-rhombo, corpus:phase:b-cu:beta-rhombo-b
paper: paper:10.1016/j.jallcom.2009.03.101:(B)
tdb: tdb:CuB-09Wan.tdb:BETA_RHOMBO_B, tdb:CuB-09Zha.tdb:BETA_RHOMBO_B

TDB models of BETA_RHOMBO_B (2): PHASE and CONSTITUENT statements as written

CuB-09Wan.tdb: BETA_RHOMBO_B, type code %, sha256 ae21f67242115ca2…

41: PHASE BETA_RHOMBO_B % 1 1 !
42: CONST BETA_RHOMBO_B : B% CU : !

CuB-09Zha.tdb: BETA_RHOMBO_B, type code %, sha256 bf22d31613d93de6…

41: PHASE BETA_RHOMBO_B % 2 93 12 !
42: CONST BETA_RHOMBO_B : B : B CU : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2009.03.101 C.P. Wang, S.H. Guo, A.T. Tang, F.S. Pan, X.J. Liu, K. Ishida, Thermodynamic assessments of the Cu–B and Cu–Tm systems, Journal of Alloys and Compounds 482, 67-72 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/s11669-009-9561-7 Wei-Wei Zhang, Yong Du, Honghui Xu, Wei Xiong, Yi Kong, Weihua Sun et al., Thermodynamic Assessment of the Cu-B System Supported by Key Experiment and First-Principles Calculations, J. Phase Equilib. Diffus. 30, 480-486 (2009).
assessment that models this phase
doi:10.1016/0022-5088(65)90126-8 Fritz Wald, Richard W. Stormont, Investigations on the constitution of certain binary boron-metal systems, Journal of the Less Common Metals 9, 423-433 (1965).
cited as the source of values for this phase

BCC_A2 (B–Cu)

Id: phase:b-cu:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-cu:bcc-a2
tdb: tdb:CuB-09Wan.tdb:BCC_A2, tdb:CuB-09Zha.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

CuB-09Wan.tdb: BCC_A2, type code %B, sha256 ae21f67242115ca2…

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

CuB-09Zha.tdb: BCC_A2, type code %B, sha256 bf22d31613d93de6…

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

Example references (2 of 2; assessments first):

doi:10.1007/s11669-009-9561-7 Wei-Wei Zhang, Yong Du, Honghui Xu, Wei Xiong, Yi Kong, Weihua Sun et al., Thermodynamic Assessment of the Cu-B System Supported by Key Experiment and First-Principles Calculations, J. Phase Equilib. Diffus. 30, 480-486 (2009).
assessment that models this phase
doi:10.1016/j.jallcom.2009.03.101 C.P. Wang, S.H. Guo, A.T. Tang, F.S. Pan, X.J. Liu, K. Ishida, Thermodynamic assessments of the Cu–B and Cu–Tm systems, Journal of Alloys and Compounds 482, 67-72 (2009).
assessment that models this phase

FCC_A1 (B–Cu)

Id: phase:b-cu: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 2 of 2 calculated diagram(s): 300–1357.77 K, x(B) 0–0.00357
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:b-cu:fcc-a1
paper: paper:10.1016/j.jallcom.2009.03.101:(Cu)
tdb: tdb:CuB-09Wan.tdb:FCC_A1, tdb:CuB-09Zha.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

CuB-09Wan.tdb: FCC_A1, type code %A, sha256 ae21f67242115ca2…

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

CuB-09Zha.tdb: FCC_A1, type code %A, sha256 bf22d31613d93de6…

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

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2009.03.101 C.P. Wang, S.H. Guo, A.T. Tang, F.S. Pan, X.J. Liu, K. Ishida, Thermodynamic assessments of the Cu–B and Cu–Tm systems, Journal of Alloys and Compounds 482, 67-72 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/s11669-009-9561-7 Wei-Wei Zhang, Yong Du, Honghui Xu, Wei Xiong, Yi Kong, Weihua Sun et al., Thermodynamic Assessment of the Cu-B System Supported by Key Experiment and First-Principles Calculations, J. Phase Equilib. Diffus. 30, 480-486 (2009).
assessment that models this phase
doi:10.1016/0022-5088(65)90126-8 Fritz Wald, Richard W. Stormont, Investigations on the constitution of certain binary boron-metal systems, Journal of the Less Common Metals 9, 423-433 (1965).
cited as the source of values for this phase

HCP_A3 (B–Cu)

Id: phase:b-cu: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 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-cu:hcp-a3
tdb: tdb:CuB-09Wan.tdb:HCP_A3, tdb:CuB-09Zha.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

CuB-09Wan.tdb: HCP_A3, type code %A, sha256 ae21f67242115ca2…

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

CuB-09Zha.tdb: HCP_A3, type code %A, sha256 bf22d31613d93de6…

36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : CU : B VA% : !

Example references (2 of 2; assessments first):

doi:10.1007/s11669-009-9561-7 Wei-Wei Zhang, Yong Du, Honghui Xu, Wei Xiong, Yi Kong, Weihua Sun et al., Thermodynamic Assessment of the Cu-B System Supported by Key Experiment and First-Principles Calculations, J. Phase Equilib. Diffus. 30, 480-486 (2009).
assessment that models this phase
doi:10.1016/j.jallcom.2009.03.101 C.P. Wang, S.H. Guo, A.T. Tang, F.S. Pan, X.J. Liu, K. Ishida, Thermodynamic assessments of the Cu–B and Cu–Tm systems, Journal of Alloys and Compounds 482, 67-72 (2009).
assessment that models this phase

LIQUID (B–Cu)

Id: phase:b-cu:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1286.15–4000 K, x(B) 0–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:b-cu:liquid
paper: paper:10.1016/j.jallcom.2009.03.101:L
tdb: tdb:CuB-09Wan.tdb:LIQUID, tdb:CuB-09Zha.tdb:LIQUID

TDB models of LIQUID (2): PHASE and CONSTITUENT statements as written

CuB-09Wan.tdb: LIQUID, type code %, sha256 ae21f67242115ca2…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : B CU : !

CuB-09Zha.tdb: LIQUID, type code %, sha256 bf22d31613d93de6…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : B CU : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2009.03.101 C.P. Wang, S.H. Guo, A.T. Tang, F.S. Pan, X.J. Liu, K. Ishida, Thermodynamic assessments of the Cu–B and Cu–Tm systems, Journal of Alloys and Compounds 482, 67-72 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/s11669-009-9561-7 Wei-Wei Zhang, Yong Du, Honghui Xu, Wei Xiong, Yi Kong, Weihua Sun et al., Thermodynamic Assessment of the Cu-B System Supported by Key Experiment and First-Principles Calculations, J. Phase Equilib. Diffus. 30, 480-486 (2009).
assessment that models this phase
doi:10.1016/0022-5088(65)90126-8 Fritz Wald, Richard W. Stormont, Investigations on the constitution of certain binary boron-metal systems, Journal of the Less Common Metals 9, 423-433 (1965).
cited as the source of 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}
}