B–Sc phases

7 phases (tier A 4, liquid 1, needs_review 2); 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 · B–Sc system page · Markdown · field reference

Phases of the B–Sc system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BETA_RHOMBO_B phase:b-sc:b-beta-rhombo		needs_review	stable in 2 of 2 calculated diagram(s): 300–2359.42 K, x(B) 0.98395–1	4	2
BCC_A2 phase:b-sc:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1607.98–3999.24 K, x(B) 0–1e-05	3	2
FCC_A1 phase:b-sc:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
HCP_A3 phase:b-sc:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1812.99 K, x(B) 0–0	3	2
LIQUID phase:b-sc:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1546.19–4000 K, x(B) 0–1	22	2
SCB12_D2F phase:b-sc:scb12-d2f		needs_review	stable in 2 of 2 calculated diagram(s): 300–2316.53 K, x(B) 0.92308–0.92308	13	2
SCB2_C32 phase:b-sc:scb2-c32	AlB2 · C32 · hP3 · P6/mmm (191)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2523.25 K, x(B) 0.66667–0.66667	14	2

BETA_RHOMBO_B (B–Sc)

Id: phase:b-sc: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 — ScB-09Liu.tdb: 'Prototype beta-B (hR105, R-3m)'
Candidate (tdb_comment): beta-B · hR105 · R-3m — ScB-90Spe-LB.tdb: 'Prototype beta-B (hR105, R-3m)'
Stability: stable in 2 of 2 calculated diagram(s): 300–2359.42 K, x(B) 0.98395–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:b-sc:b-beta-rhombo, corpus:phase:b-sc:beta-rhombo-b
paper: paper:10.1016/j.jallcom.2008.02.018:βB
tdb: tdb:ScB-09Liu.tdb:BETA_RHOMBO_B, tdb:ScB-90Spe-LB.tdb:BETA_RHOMBO_B

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

ScB-09Liu.tdb: BETA_RHOMBO_B, type code %, sha256 4ddfc8ae1edee788…

40: PHASE BETA_RHOMBO_B % 1 1 !
41: CONST BETA_RHOMBO_B : B% SC : !

ScB-90Spe-LB.tdb: BETA_RHOMBO_B, type code %, sha256 a196e50efc20f9b4…

50: PHASE BETA_RHOMBO_B % 1 1 !
51: CONST BETA_RHOMBO_B : B : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2008.02.018 X.J. Liu, S.L. Wang, C.P. Wang, Thermodynamic assessments of the Sc–M (M: Ag, B and Th) systems, Journal of Alloys and Compounds 469, 186-192 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02843307 K.E. Spear, P.K. Liao, Bull. Alloy Phase Diag., 11, 321-24(1990).
assessment that models this phase; cited as the source of values for this phase
doi:10.1016/0022-4596(78)90089-0 Bengt Callmer, A single-crystal diffractometry investigation of scandium in β-rhombohedral boron, Journal of Solid State Chemistry 23, 391-398 (1978).
cited as the source of values for this phase

BCC_A2 (B–Sc)

Id: phase:b-sc: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 2 of 2 calculated diagram(s): 1607.98–3999.24 K, x(B) 0–1e-05
Literature: 3 values (3 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:b-sc:bcc-a2
paper: paper:10.1007/bf02843307:βSc, paper:10.1016/j.jallcom.2008.02.018:βSc
tdb: tdb:ScB-09Liu.tdb:BCC_A2, tdb:ScB-90Spe-LB.tdb:BCC_A2

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

ScB-09Liu.tdb: BCC_A2, type code %B, sha256 4ddfc8ae1edee788…

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

ScB-90Spe-LB.tdb: BCC_A2, type code %B, sha256 a196e50efc20f9b4…

40: PHASE BCC_A2 %B 2 1 3 !
41: CONST BCC_A2 : SC : B VA : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02843307 K.E. Spear, P.K. Liao, Bull. Alloy Phase Diag., 11, 321-24(1990).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.jallcom.2008.02.018 X.J. Liu, S.L. Wang, C.P. Wang, Thermodynamic assessments of the Sc–M (M: Ag, B and Th) systems, Journal of Alloys and Compounds 469, 186-192 (2009).
assessment that models this phase; reports values for this phase

FCC_A1 (B–Sc)

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

Names (3): corpus: corpus:phase:b-sc:fcc-a1
tdb: tdb:ScB-09Liu.tdb:FCC_A1, tdb:ScB-90Spe-LB.tdb:FCC_A1

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

ScB-09Liu.tdb: FCC_A1, type code %A, sha256 4ddfc8ae1edee788…

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

ScB-90Spe-LB.tdb: FCC_A1, type code %A, sha256 a196e50efc20f9b4…

35: PHASE FCC_A1 %A 2 1 1 !
36: CONST FCC_A1 : SC : B VA : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02843307 K.E. Spear, P.K. Liao, Bull. Alloy Phase Diag., 11, 321-24(1990).
assessment that models this phase
doi:10.1016/j.jallcom.2008.02.018 X.J. Liu, S.L. Wang, C.P. Wang, Thermodynamic assessments of the Sc–M (M: Ag, B and Th) systems, Journal of Alloys and Compounds 469, 186-192 (2009).
assessment that models this phase

HCP_A3 (B–Sc)

Id: phase:b-sc: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 2 of 2 calculated diagram(s): 300–1812.99 K, x(B) 0–0
Literature: 3 values (3 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:b-sc:hcp-a3
paper: paper:10.1007/bf02843307:(αSc), paper:10.1016/j.jallcom.2008.02.018:αSc
tdb: tdb:ScB-09Liu.tdb:HCP_A3, tdb:ScB-90Spe-LB.tdb:HCP_A3

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

ScB-09Liu.tdb: HCP_A3, type code %A, sha256 4ddfc8ae1edee788…

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

ScB-90Spe-LB.tdb: HCP_A3, type code %A, sha256 a196e50efc20f9b4…

45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : SC : B VA : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02843307 K.E. Spear, P.K. Liao, Bull. Alloy Phase Diag., 11, 321-24(1990).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.jallcom.2008.02.018 X.J. Liu, S.L. Wang, C.P. Wang, Thermodynamic assessments of the Sc–M (M: Ag, B and Th) systems, Journal of Alloys and Compounds 469, 186-192 (2009).
assessment that models this phase; reports values for this phase

LIQUID (B–Sc)

Id: phase:b-sc:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1546.19–4000 K, x(B) 0–1
Literature: 22 values (21 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:b-sc:liquid
paper: paper:10.1007/bf02843307:L, paper:10.1007/bf02843307:liquid, paper:10.1016/j.jallcom.2008.02.018:L
tdb: tdb:ScB-09Liu.tdb:LIQUID, tdb:ScB-90Spe-LB.tdb:LIQUID

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

ScB-09Liu.tdb: LIQUID, type code %, sha256 4ddfc8ae1edee788…

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

ScB-90Spe-LB.tdb: LIQUID, type code %, sha256 a196e50efc20f9b4…

30: PHASE LIQUID:L % 1 1 !
31: CONST LIQUID:L : B SC : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2008.02.018 X.J. Liu, S.L. Wang, C.P. Wang, Thermodynamic assessments of the Sc–M (M: Ag, B and Th) systems, Journal of Alloys and Compounds 469, 186-192 (2009).
assessment that models this phase; reports values for this phase
doi:10.1007/BF02843307 K.E. Spear, P.K. Liao, Bull. Alloy Phase Diag., 11, 321-24(1990).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/0022-4596(78)90089-0 Bengt Callmer, A single-crystal diffractometry investigation of scandium in β-rhombohedral boron, Journal of Solid State Chemistry 23, 391-398 (1978).
cited as the source of values for this phase
doi:10.1016/0025-5408(70)90017-6 P. Peshev, J. Etourneau, R. Naslain, Sur le systeme bore-scandium, Materials Research Bulletin 5, 319-327 (1970).
cited as the source of values for this phase

SCB12_D2F (B–Sc)

Id: phase:b-sc:scb12-d2f; status needs_review
No structure assigned. Why: sgte_mmc2_row_disagrees_with_name:SCB12_D2F; sgte_mmc2_rows_disagree
Candidate (dft_mp): Fm-3m (225) — on-hull MP ScB12 at x(SC)=0.0769
Candidate (dft_oqmd): Fm-3m (225) — on-hull OQMD B12 Sc1 at x(SC)=0.0769
Candidate (literature_printed): ScB12 · tI26 — printed with a label mapped to this phase
Candidate (name_token): UB12 · D2_f · cF52 · Fm-3m (225) — Strukturbericht/word 'D2F' in the TDB name
Candidate (sgte_mmc2): UB12 · D2_f · cF52 · Fm-3m (225) — Hallstedt 2025 mmc2 row for SCB12_D2F: ScB12 (alt. prototype ScB12)
Candidate (sgte_mmc2): ScB12 · tI26 · I4/mmm (139) — Hallstedt 2025 mmc2 row for SCB12_D2F: ScB12 (see UB12)
Candidate (tdb_comment): UB12 · cF52 · Fm-3m — ScB-09Liu.tdb: 'Prototype UB12 (cF52, Fm-3m)'
Candidate (tdb_comment): UB12 · cF52 · Fm-3m — ScB-90Spe-LB.tdb: 'Prototype UB12 (cF52, Fm-3m)'
Stoichiometry: B 0.9231, Sc 0.0769
Stability: stable in 2 of 2 calculated diagram(s): 300–2316.53 K, x(B) 0.92308–0.92308
Literature: 13 values (13 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:b-sc:scb12-d2f
paper: paper:10.1007/bf02843307:ScB12, paper:10.1016/j.jallcom.2008.02.018:ScB12
tdb: tdb:ScB-09Liu.tdb:SCB12_D2F, tdb:ScB-90Spe-LB.tdb:SCB12_D2F

TDB models of SCB12_D2F (2): PHASE and CONSTITUENT statements as written

ScB-09Liu.tdb: SCB12_D2F, type code %, sha256 4ddfc8ae1edee788…

52: PHASE SCB12_D2F % 2 1 12 !
53: CONST SCB12_D2F : SC : B : !

ScB-90Spe-LB.tdb: SCB12_D2F, type code %, sha256 a196e50efc20f9b4…

62: PHASE SCB12_D2F % 2 1 12 !
63: CONST SCB12_D2F : SC : B : !

Example references (4 of 4; assessments first):

doi:10.1007/BF02843307 K.E. Spear, P.K. Liao, Bull. Alloy Phase Diag., 11, 321-24(1990).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.jallcom.2008.02.018 X.J. Liu, S.L. Wang, C.P. Wang, Thermodynamic assessments of the Sc–M (M: Ag, B and Th) systems, Journal of Alloys and Compounds 469, 186-192 (2009).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-4596(78)90089-0 Bengt Callmer, A single-crystal diffractometry investigation of scandium in β-rhombohedral boron, Journal of Solid State Chemistry 23, 391-398 (1978).
cited as the source of values for this phase
doi:10.1016/0025-5408(70)90017-6 P. Peshev, J. Etourneau, R. Naslain, Sur le systeme bore-scandium, Materials Research Bulletin 5, 319-327 (1970).
cited as the source of values for this phase

SCB2_C32 (B–Sc)

Id: phase:b-sc:scb2-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-aaaaadiq and oqmd-8428, space group 191
Stoichiometry: B 0.6667, Sc 0.3333
Stability: stable in 2 of 2 calculated diagram(s): 300–2523.25 K, x(B) 0.66667–0.66667
Literature: 14 values (14 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:b-sc:scb2-c32
mp: mp:mp-aaaaadiq
oqmd: oqmd:oqmd-8428
paper: paper:10.1007/bf02843307:ScB2, paper:10.1016/j.jallcom.2008.02.018:ScB2
tdb: tdb:ScB-09Liu.tdb:SCB2_C32, tdb:ScB-90Spe-LB.tdb:SCB2_C32

TDB models of SCB2_C32 (2): PHASE and CONSTITUENT statements as written

ScB-09Liu.tdb: SCB2_C32, type code %, sha256 4ddfc8ae1edee788…

45: PHASE SCB2_C32 % 2 1 2 !
46: CONST SCB2_C32 : SC : B : !

ScB-90Spe-LB.tdb: SCB2_C32, type code %, sha256 a196e50efc20f9b4…

55: PHASE SCB2_C32 % 2 1 2 !
56: CONST SCB2_C32 : SC : B : !

Example references (2 of 2; assessments first):

doi:10.1007/BF02843307 K.E. Spear, P.K. Liao, Bull. Alloy Phase Diag., 11, 321-24(1990).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1016/j.jallcom.2008.02.018 X.J. Liu, S.L. Wang, C.P. Wang, Thermodynamic assessments of the Sc–M (M: Ag, B and Th) systems, Journal of Alloys and Compounds 469, 186-192 (2009).
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}
}