B–W phases

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

Phases of the B–W system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BETA_RHOMBO_B phase:b-w:b-beta-rhombo		needs_review	stable in 1 of 1 calculated diagram(s): 300–2350 K, x(B) 1–1	0	1
BCC_A2 phase:b-w:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–3999.78 K, x(B) 0–0.00151	4	1
M2B_C16 phase:b-w:c16-m2b	Al2Cu · C16 · tI12 · I4/mcm (140)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2932.09 K, x(B) 0.33333–0.33333	21	1
FCC_A1 phase:b-w: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-w:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LIQUID phase:b-w:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 2174.06–4000 K, x(B) 0–1	20	1
W2B5_D8I phase:b-w:w2b5-d8i	Mo2B5 · D8_i · hR7 · R-3m (166)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2633.82 K, x(B) 0.67528–0.71224	16	1
W2B9 phase:b-w:w2b9	W2B9 · hP22 · P-3 (147)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2309.91 K, x(B) 0.81818–0.81818	4	1
WB_B33 phase:b-w:wb-b33	CrB · B33 · oC8 · Cmcm (63)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 2328.11–2951.98 K, x(B) 0.47381–0.49722	13	1
WB_BG phase:b-w:wb-bg	MoB · B_g · tI16 · I4_1/amd (141)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2436.49 K, x(B) 0.48014–0.5	16	1

BETA_RHOMBO_B (B–W)

Id: phase:b-w: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 — WB-95Dus-LB.tdb: 'Prototype beta-B (hR105, R-3m)'
Stoichiometry: B 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–2350 K, x(B) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-w:b-beta-rhombo, corpus:phase:b-w:beta-rhombo-b
tdb: tdb:WB-95Dus-LB.tdb:BETA_RHOMBO_B

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

WB-95Dus-LB.tdb: BETA_RHOMBO_B, type code %, sha256 9983d096ff608c15…

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

Example references (1 of 1; assessments first):

doi:10.1007/BF02664852 H. Duschanek, P. Rogl, J. Phase Equilib., 16, 150-61(1995).
assessment that models this phase

BCC_A2 (B–W)

Id: phase:b-w: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): 300–3999.78 K, x(B) 0–0.00151
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-w:bcc-a2
paper: paper:10.1007/bf02664852:W
tdb: tdb:WB-95Dus-LB.tdb:BCC_A2

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

WB-95Dus-LB.tdb: BCC_A2, type code %B, sha256 9983d096ff608c15…

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

Example references (1 of 1; assessments first):

doi:10.1007/BF02664852 H. Duschanek, P. Rogl, J. Phase Equilib., 16, 150-61(1995).
assessment that models this phase; reports values for this phase

M2B_C16 (B–W)

Id: phase:b-w:c16-m2b; status assigned
Structure: Al2Cu · C16 · tI12 · I4/mcm (140); type st:c16-al2cu-ti12; 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: DFT agrees: on-hull mp-aaaaabqv and oqmd-4586, space group 140
Caveat: not certain from the name or DFT alone (unrecognised_name_tokens:M2B); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: B 0.3333, W 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–2932.09 K, x(B) 0.33333–0.33333
Literature: 21 values (21 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:b-w:c16-m2b, corpus:phase:b-w:m2b-c16
mp: mp:mp-aaaaabqv
oqmd: oqmd:oqmd-4586
paper: paper:10.1007/bf02664852:W2B
tdb: tdb:WB-95Dus-LB.tdb:M2B_C16

TDB models of M2B_C16 (1): PHASE and CONSTITUENT statements as written

WB-95Dus-LB.tdb: M2B_C16, type code %, sha256 9983d096ff608c15…

51: PHASE M2B_C16 % 2 2 1 !
52: CONST M2B_C16 : W : B : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02664852 H. Duschanek, P. Rogl, J. Phase Equilib., 16, 150-61(1995).
assessment that models this phase; reports values for this phase

FCC_A1 (B–W)

Id: phase:b-w: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:b-w:fcc-a1
tdb: tdb:WB-95Dus-LB.tdb:FCC_A1

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

WB-95Dus-LB.tdb: FCC_A1, type code %A, sha256 9983d096ff608c15…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : W : B VA% : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02664852 H. Duschanek, P. Rogl, J. Phase Equilib., 16, 150-61(1995).
assessment that models this phase

HCP_A3 (B–W)

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

Names (2): corpus: corpus:phase:b-w:hcp-a3
tdb: tdb:WB-95Dus-LB.tdb:HCP_A3

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

WB-95Dus-LB.tdb: HCP_A3, type code %A, sha256 9983d096ff608c15…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : W : B VA% : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02664852 H. Duschanek, P. Rogl, J. Phase Equilib., 16, 150-61(1995).
assessment that models this phase

LIQUID (B–W)

Id: phase:b-w:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 2174.06–4000 K, x(B) 0–1
Literature: 20 values (20 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-w:liquid
paper: paper:10.1007/bf02664852:L
tdb: tdb:WB-95Dus-LB.tdb:LIQUID

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

WB-95Dus-LB.tdb: LIQUID, type code %, sha256 9983d096ff608c15…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : B W : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02664852 H. Duschanek, P. Rogl, J. Phase Equilib., 16, 150-61(1995).
assessment that models this phase; reports values for this phase

W2B5_D8I (B–W)

Id: phase:b-w:w2b5-d8i; status assigned
Structure: Mo2B5 · D8_i · hR7 · R-3m (166); type st:d8-i-mo2b5-hr7; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2633.82 K, x(B) 0.67528–0.71224
Literature: 16 values (16 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:b-w:w2b5-d8i
paper: paper:10.1007/bf02664852:W2B5, paper:10.1007/bf02664852:W2B5-x
tdb: tdb:WB-95Dus-LB.tdb:W2B5_D8I

TDB models of W2B5_D8I (1): PHASE and CONSTITUENT statements as written

WB-95Dus-LB.tdb: W2B5_D8I, type code %, sha256 9983d096ff608c15…

66: PHASE W2B5_D8I % 2 2 5 !
67: CONST W2B5_D8I : W : B VA : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02664852 H. Duschanek, P. Rogl, J. Phase Equilib., 16, 150-61(1995).
assessment that models this phase; reports values for this phase

W2B9 (B–W)

Id: phase:b-w:w2b9; status assigned
Structure: W2B9 · hP22 · P-3 (147); type st:w2b9-hp22; 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 0.8182, W 0.1818
Stability: stable in 1 of 1 calculated diagram(s): 300–2309.91 K, x(B) 0.81818–0.81818
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-w:w2b9
paper: paper:10.1007/bf02664852:W1-xB3
tdb: tdb:WB-95Dus-LB.tdb:W2B9

TDB models of W2B9 (1): PHASE and CONSTITUENT statements as written

WB-95Dus-LB.tdb: W2B9, type code %, sha256 9983d096ff608c15…

71: PHASE W2B9 % 2 2 9 !
72: CONST W2B9 : W : B : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02664852 H. Duschanek, P. Rogl, J. Phase Equilib., 16, 150-61(1995).
assessment that models this phase; reports values for this phase

WB_B33 (B–W)

Id: phase:b-w:wb-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; 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_token_is_also_a_formula); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 2328.11–2951.98 K, x(B) 0.47381–0.49722
Literature: 13 values (13 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-w:wb-b33
paper: paper:10.1007/bf02664852:βWB
tdb: tdb:WB-95Dus-LB.tdb:WB_B33

TDB models of WB_B33 (1): PHASE and CONSTITUENT statements as written

WB-95Dus-LB.tdb: WB_B33, type code %, sha256 9983d096ff608c15…

61: PHASE WB_B33 % 2 1 1 !
62: CONST WB_B33 : W : B VA : !

Example references (1 of 1; assessments first):

doi:10.1007/BF02664852 H. Duschanek, P. Rogl, J. Phase Equilib., 16, 150-61(1995).
assessment that models this phase; reports values for this phase

WB_BG (B–W)

Id: phase:b-w:wb-bg; status assigned
Structure: MoB · B_g · tI16 · I4_1/amd (141); type st:b-g-mob-ti16; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2436.49 K, x(B) 0.48014–0.5
Literature: 16 values (16 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:b-w:wb-bg
paper: paper:10.1007/bf02664852:αWB
tdb: tdb:WB-95Dus-LB.tdb:WB_BG

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

WB-95Dus-LB.tdb: WB_BG, type code %, sha256 9983d096ff608c15…

56: PHASE WB_BG % 2 1 1 !
57: CONST WB_BG : W : B VA : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02664852 H. Duschanek, P. Rogl, J. Phase Equilib., 16, 150-61(1995).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(76)90180-6 A.R. Miedema, On the heat of formation of solid alloys. II, Journal of the Less Common Metals 46, 67-83 (1976).
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}
}