# B–Sc system

> B–Sc system: 34 accepted literature values (crystal structure 13, invariant reaction 13, phase transition 8) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote.

HTML: https://data.orchid-project.org/systems/B-SC.html · Markdown: https://data.orchid-project.org/systems/B-SC.md

34 accepted literature values from 2 paper(s) (experimental 7, model 12, unspecified 15); 0 calculated phase diagram(s). 1 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: [JSON](https://data.orchid-project.org/literature/systems/B-SC.json) · [CSV](https://data.orchid-project.org/systems/B-SC.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#B-SC) · [phases (7)](https://data.orchid-project.org/phases/pages/B-SC.html) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/B-SC.html) · [Markdown](https://data.orchid-project.org/systems/B-SC.md)

Table: Accepted values by evidence class

| Evidence class | Values |
|---|---:|
| experimental | 7 |
| model | 12 |
| unspecified | 15 |

Table: Accepted values by property group

| Property group | Values |
|---|---:|
| invariant reaction | 13 |
| phase transition | 8 |
| crystal structure | 13 |

Convex hulls: [Materials Project DFT hull](https://data.orchid-project.org/hulls/dft-mp/B/B-SC.json) · [OQMD DFT hull](https://data.orchid-project.org/hulls/dft-oqmd/B/B-SC.json) · [CALPHAD hull ScB-90Spe-LB](https://data.orchid-project.org/hulls/calphad-sgte/B/B-SC--ScB-90Spe-LB.json)

## Invariant reactions (literature)

Table: Invariant reactions reported in the literature for the B–Sc system (13)

| T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote |
|---:|---|---|---|---|---|---|
| 2523.15 | congruent melting: L -> ScB2 | ScB2: B 0.67 | unspecified | [1] Spear 1990; _cites ref. 60Sam_ | Table I, p. 1, row 4; `ORC-BLN7XB67OY` |  |
| 2365.15 | congruent melting: L -> βB | βB: B 1 | model | [1] Spear 1990 | Table I, p. 1, row 8; `ORC-Z6HD7ZOVQN` |  |
| 2313.15 | congruent melting: L -> ScB12 | ScB12: B 0.92 | experimental | [1] Spear 1990; _cites Peshev 1976_ | Table I, p. 1, row 6; `ORC-QDPN3YQYKE` |  |
| 2279.05 | eutectic: L -> βB + ScB12 | L: B 0.959; βB: B 0.984; ScB12: B 0.923 | model | [2] Liu 2009 | Table 5, p. 5, row 4; `ORC-S5GMORR6N4` |  |
| 2276.15 | eutectic: L -> ScB12 + (βB) | L: B 0.96; ScB12: B 0.92; (βB): B 0.965 | model | [1] Spear 1990 | Table I, p. 1, row 7; `ORC-JUC6IK5FFJ` |  |
| 2276.15 | eutectic: L -> βB + ScB12 | L: B 0.96; βB: B 0.965; ScB12: B 0.923 | unspecified | [2] Liu 2009; _cites Callmer 1978_ [doi](https://doi.org/10.1016/0022-4596%2878%2990089-0) | Table 5, p. 5, row 3; `ORC-VLGEATE32B` |  |
| 2150.15 | eutectic: L -> ScB2 + ScB12 | L: B 0.83; ScB2: B 0.667; ScB12: B 0.923 | experimental | [2] Liu 2009; _cites Spear 1990_ [doi](https://doi.org/10.1007/bf02843307) | Table 5, p. 5, row 7; `ORC-76X57JEBFY` |  |
| 2150.15 | eutectic: L -> ScB2 + ScB12 | L: B 0.83; ScB2: B 0.67; ScB12: B 0.92 | model | [1] Spear 1990 | Table I, p. 1, row 5; `ORC-M5C4OOKS2B` |  |
| 2144.75 | eutectic: L -> ScB2 + ScB12 | L: B 0.831; ScB2: B 0.667; ScB12: B 0.923 | model | [2] Liu 2009 | Table 5, p. 5, row 8; `ORC-GFRESOU6ZP` |  |
| 1814.15 | congruent melting: L -> βSc | βSc: B 0 | model | [1] Spear 1990 | Table I, p. 1, row 1; `ORC-6FGJSPXKTD` |  |
| 1551.05 | eutectic: L -> ScB2 + αSc | L: B 0.176; ScB2: B 0.667; αSc: B 0 | model | [2] Liu 2009 | Table 5, p. 5, row 12; `ORC-2IFHSPNHI6` |  |
| 1550.15 | eutectic: L -> ScB2 + αSc | L: B 0.17; ScB2: B 0.667; αSc: B 0 | experimental | [2] Liu 2009; _cites Spear 1990_ [doi](https://doi.org/10.1007/bf02843307) | Table 5, p. 5, row 11; `ORC-UEA7HKDQG2` |  |
| 1550.15 | eutectic: L -> (αSc) + ScB2 | L: B 0.17; ScB2: B 0.67 | model | [1] Spear 1990 | Table I, p. 1, row 3; `ORC-VLC3Q2UW4M` |  |

## Other properties

### Phase transition (8)

Table: Phase transition, B–Sc system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Phase transition | 1814.15 K | 1814.15 | congruent melting: L -> βSc; _βSc: B 0_ | model | [2] Liu 2009 | Table 5, p. 5, row 16; `ORC-4V5XIVRWHS` |  |
| Phase transition | 1814.15 K | 1814.15 | congruent melting: L -> βSc; _βSc: B 0_ | experimental | [2] Liu 2009; _cites Spear 1990_ [doi](https://doi.org/10.1007/bf02843307) | Table 5, p. 5, row 15; `ORC-KVYUJWNZUG` |  |
| Phase transition | 2313.15 K | 2313.15 | congruent melting: L -> ScB12; _L: B 0.923; ScB12: B 0.923_ | experimental | [2] Liu 2009; _cites Peshev 1970_ [doi](https://doi.org/10.1016/0025-5408%2870%2990017-6) | Table 5, p. 5, row 5; `ORC-YUHBKKFWDB` |  |
| Phase transition | 2315.75 K | 2315.75 | congruent melting: L -> ScB12; _L: B 0.923; ScB12: B 0.923_ | model | [2] Liu 2009 | Table 5, p. 5, row 6; `ORC-UVPTIPA3A2` |  |
| Phase transition | 2365.15 K | 2365.15 | congruent melting: L -> βB; _βB: B 1_ | model | [2] Liu 2009 | Table 5, p. 5, row 2; `ORC-6X46DJOZLV` |  |
| Phase transition | 2365.15 K | 2365.15 | congruent melting: L -> βB; _βB: B 1_ | experimental | [2] Liu 2009; _cites Spear 1990_ [doi](https://doi.org/10.1007/bf02843307) | Table 5, p. 5, row 1; `ORC-B5OFLEBAXQ` |  |
| Phase transition | 2523.15 K | 2523.15 | congruent melting: L -> ScB2; _L: B 0.667; ScB2: B 0.667_ | experimental | [2] Liu 2009; _cites Samsonov 1965_ | Table 5, p. 5, row 9; `ORC-FMJ4W6NLIT` |  |
| Phase transition | 2523.35 K | 2523.35 | congruent melting: L -> ScB2; _L: B 0.667; ScB2: B 0.667_ | model | [2] Liu 2009 | Table 5, p. 5, row 10; `ORC-ISXN7E74CJ` |  |

### Crystal structure (13)

Table: Crystal structure, B–Sc system

| Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote |
|---|---:|---:|---|---|---|---|---|
| Lattice a | 10.962 Å | 298.15 | (βB)(a); _alloy: B 0.965, Sc 0.035_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 9; `ORC-3WZQTNJ2NB.9b161d` |  |
| Lattice a | 10.966 Å | 298.15 | (βB)(a); _(βB)(a): B 0.965, Sc 0.035_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 8; `ORC-HORW4PELBT.dd50a0` |  |
| Lattice a | 5.22 Å | 298.15 | ScB12; _ScB12: B 0.92, Sc 0.08_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 6; `ORC-7Z5YJDX6RW.03d1a7` |  |
| Lattice a | 5.2347 Å | 298.15 | ScB12; _ScB12: B 0.92, Sc 0.08_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 7; `ORC-TXIEZGT6NE.cdf942` |  |
| Lattice a | 3.148 Å | 298.15 | ScB2; _ScB2: B 0.67, Sc 0.33_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 3; `ORC-C24L4ZDRBW.907891` |  |
| Lattice a | 3.146 Å | 298.15 | ScB2; _ScB2: B 0.67, Sc 0.33_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 4; `ORC-PYVYBZQQCG.573941` |  |
| Lattice c | 24.075 Å | 298.15 | (βB)(a); _alloy: Sc 0_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 9; `ORC-3WZQTNJ2NB.596a10` |  |
| Lattice c | 24.088 Å | 298.15 | (βB)(a); _(βB)(a): B 0.965, Sc 0.035_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 8; `ORC-HORW4PELBT.a2e09d` |  |
| Lattice c | 7.35 Å | 298.15 | ScB12; _ScB12: B 0.92, Sc 0.08_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 6; `ORC-7Z5YJDX6RW.240be8` |  |
| Lattice c | 7.3583 Å | 298.15 | ScB12; _ScB12: B 0.92, Sc 0.08_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 7; `ORC-TXIEZGT6NE.e7cca2` |  |
| Lattice c | 3.516 Å | 298.15 | ScB2; _ScB2: B 0.67, Sc 0.33_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 3; `ORC-C24L4ZDRBW.c13ac7` |  |
| Lattice c | 3.517 Å | 298.15 | ScB2; _ScB2: B 0.67, Sc 0.33_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 4; `ORC-PYVYBZQQCG.a7d78c` |  |
| Lattice c | 3.518 Å | 298.15 | ScB2; _ScB2: B 0.67, Sc 0.33_ | unspecified | [1] Spear 1990 | Table 3, p. 3, row 5; `ORC-YHZ4SDCBCN.78ddd8` |  |

## Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

1. K. E. Spear, P. K. Liao, The B-Sc (Boron-Scandium) system, Bulletin of Alloy Phase Diagrams 11, 321-324 (1990). [doi:10.1007/bf02843307](https://doi.org/10.1007/bf02843307)
2. 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). [doi:10.1016/j.jallcom.2008.02.018](https://doi.org/10.1016/j.jallcom.2008.02.018)

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569
- R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). https://doi.org/10.5281/zenodo.23735891
- R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); 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); 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.

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.

```bibtex
@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\<id>, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).