B–V system

21 accepted literature values from 1 paper(s) (experimental 7, model 13, unspecified 1); 0 calculated phase diagram(s). 2 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · phases (11) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	7
model	13
unspecified	1

Accepted values by property group
Property group	Values
phase transition	14
formation	6
other property	1

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull VB-12Hom · CALPHAD hull VB-81Spe · CALPHAD hull VB-91Pan-LB

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, B–V system (1)
Phase	Compound	Value	T (K)	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location	Quote
V5B6	V5B6	-70.116 kJ/mol-atom		model	-80.098 (mp-aaacqqrp)	-78.876 (oqmd-1454661)	[1] Spear 1981	Table 2, p. 4, row 8 report

Other properties

Phase transition (14)

Phase transition, B–V system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	2008 K	2008	A L: V 0.85	model	[1] Spear 1981	Table 4, p. 6, row 2 report
Phase transition	2010 K	2010	A L: V 0.86	experimental	[1] Spear 1981	Table 4, p. 6, row 1 report
Phase transition	2173 K	2173	B L: V 0.74	experimental	[1] Spear 1981	Table 4, p. 6, row 3 report
Phase transition	2198 K	2198	B L: V 0.75	model	[1] Spear 1981	Table 4, p. 6, row 4 report
Phase transition	2308 K	2308	G L: V 0.02	experimental	[1] Spear 1981	Table 4, p. 6, row 13 report
Phase transition	2341 K	2341	G L: V 0.03	model	[1] Spear 1981	Table 4, p. 6, row 14 report
Phase transition	2824 K	2824	C L: V 0.51	model	[1] Spear 1981	Table 4, p. 6, row 6 report
Phase transition	2843 K	2843	C L: V 0.53	experimental	[1] Spear 1981	Table 4, p. 6, row 5 report
Phase transition	2883 K	2883	D L: V 0.46	experimental	[1] Spear 1981	Table 4, p. 6, row 7 report
Phase transition	2913 K	2913	D L: V 0.44	model	[1] Spear 1981	Table 4, p. 6, row 8 report
Phase transition	2926 K	2926	E L: V 0.43	model	[1] Spear 1981	Table 4, p. 6, row 10 report
Phase transition	2940 K	2940	E L: V 0.42	experimental	[1] Spear 1981	Table 4, p. 6, row 9 report
Phase transition	3020 K	3020	F L: V 0.33	experimental	[1] Spear 1981	Table 4, p. 6, row 11 report
Phase transition	3023 K	3023	F L: V 0.33	model	[1] Spear 1981	Table 4, p. 6, row 12 report

Formation (5)

Formation, B–V system
Property	Value	Phases / composition	Class	Source	Location
Entropy of formation printed: ΔSf°	-1.67 J/mol-atom/K	V3B2 alloy: V 0.6	model	[1] Spear 1981	Table 2, p. 4, row 4 report
Entropy of formation printed: ΔSf°	-2.85 J/mol-atom/K	V3B4 alloy: V 0.428571	model	[1] Spear 1981	Table 2, p. 4, row 10 report
Entropy of formation printed: ΔSf°	-2.85 J/mol-atom/K	V5B6 alloy: V 0.454545	model	[1] Spear 1981	Table 2, p. 4, row 8 report
Entropy of formation printed: ΔSf°	-2.51 J/mol-atom/K	VB alloy: V 0.5	model	[1] Spear 1981	Table 2, p. 4, row 6 report
Entropy of formation printed: ΔSf°	-3.35 J/mol-atom/K	VB2 alloy: V 0.333333	model	[1] Spear 1981	Table 2, p. 4, row 14 report

Other property (1)

Other property, B–V system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Transition enthalpy printed: ΔH°	50210 J (g at.)^-1	2365	UNKNOWN alloy: V 0	unspecified	[1] Spear 1981	Table 1, p. 4, row 17 report

Sources

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

K.E. Spear, J.H. Blanks, M.S. Wang, Thermodynamic modeling of the VB system, Journal of the Less Common Metals 82, 237-243 (1981). doi:10.1016/0022-5088(81)90224-1

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). doi: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). doi: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). doi: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.

@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}
}