B–Cr system

70 accepted literature values from 1 paper(s) (experimental 45, model 25); 0 calculated phase diagram(s). 10 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · phases (12) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	45
model	25

Accepted values by property group
Property group	Values
invariant reaction	14
phase transition	9
formation	16
crystal structure	31

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull CrB-02Cam · CALPHAD hull CrB-91Pan-LB

Invariant reactions (literature)

Invariant reactions reported in the literature for the B–Cr system (14)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
2356.15	peritectic: L + CrB2 -> Cr3B4	L: B 0.533; CrB2: B 0.667; Cr3B4: B 0.571	model	[1] Campbell 2002	Table 2, p. 3, row 14 report
2354.15	eutectic: L -> CrB + Cr3B4	L: B 0.529; CrB: B 0.5; Cr3B4: B 0.571	model	[1] Campbell 2002	Table 2, p. 3, row 12 report
2343.15	peritectic: L + CrB2 -> Cr3B4	L: B 0.56; CrB2: B 0.667; Cr3B4: B 0.571	experimental	[1] Campbell 2002 cites ref. 18	Table 2, p. 3, row 13 report
2323.15	eutectic: L -> CrB + Cr3B4	L: B 0.535; CrB: B 0.5; Cr3B4: B 0.571	experimental	[1] Campbell 2002 cites ref. 19	Table 2, p. 3, row 11 report
2187.15	peritectic: L + CrB -> Cr5B3	L: B 0.357; CrB: B 0.5; Cr5B3: B 0.375	model	[1] Campbell 2002	Table 2, p. 3, row 8 report
2173.15	peritectic: L + CrB -> Cr5B3	L: B 0.34; CrB: B 0.5; Cr5B3: B 0.375	experimental	[1] Campbell 2002 cites ref. 18	Table 2, p. 3, row 7 report
2151.15	peritectic: L + Cr5B3 -> Cr2B	L: B 0.313; Cr5B3: B 0.375; Cr2B: B 0.333	model	[1] Campbell 2002	Table 2, p. 3, row 6 report
2143.15	peritectic: L + Cr5B3 -> Cr2B	L: B 0.31; Cr5B3: B 0.375; Cr2B: B 0.333	experimental	[1] Campbell 2002 cites ref. 18	Table 2, p. 3, row 5 report
2112.15	eutectic: L -> CrB2 + β(B)	L: B 0.835; CrB2: B 0.667; β(B): B 1	model	[1] Campbell 2002	Table 2, p. 3, row 18 report
2103.15	eutectic: L -> CrB2 + β(B)	L: B 0.83; CrB2: B 0.667; β(B): B 0.98	experimental	[1] Campbell 2002 cites ref. 19	Table 2, p. 3, row 17 report
1903.15	eutectic: L -> BCC(Cr) + Cr2B	L: B 0.135; BCC(Cr): B 0.01; Cr2B: B 0.333	experimental	[1] Campbell 2002 cites ref. 19	Table 2, p. 3, row 3 report
1878.15	eutectic: L -> BCC(Cr) + Cr2B	L: B 0.168; BCC(Cr): B 0.0105; Cr2B: B 0.333	model	[1] Campbell 2002	Table 2, p. 3, row 4 report
1779.15	peritectoid: CrB2 + β(B) -> CrB4	CrB2: B 0.667; β(B): B 1; CrB4: B 0.8	model	[1] Campbell 2002	Table 2, p. 3, row 20 report
1773.15	peritectoid: CrB2 + β(B) -> CrB4	CrB2: B 0.667; β(B): B 1; CrB4: B 0.8	experimental	[1] Campbell 2002 cites ref. 21	Table 2, p. 3, row 19 report

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–Cr system (16)
Phase	Compound	Value	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
Cr2B	Cr2B	-36 kJ/mol-atom	model	-35.874 (mp-aaabgkiy)	-36.091 (oqmd-28322)	[1] Campbell 2002 cites ref. 41	Table 4, p. 6, row 19 report
Cr2B	Cr2B	-30.8 kJ/mol-atom	model	-35.874 (mp-aaabgkiy)	-36.091 (oqmd-28322)	[1] Campbell 2002	Table 4, p. 6, row 14 report
Cr2B	Cr2B	-28.3 kJ/mol-atom	model	-35.874 (mp-aaabgkiy)	-36.091 (oqmd-28322)	[1] Campbell 2002 cites ref. 16	Table 4, p. 6, row 9 report
Cr2B	Cr2B	-28.3 kJ/mol-atom	model	-35.874 (mp-aaabgkiy)	-36.091 (oqmd-28322)	[1] Campbell 2002 cites ref. 42	Table 4, p. 6, row 4 report
Cr3B4	Cr3B4	-43 kJ/mol-atom	model	-44.409 (mp-aaaaabif)	-44.171 (oqmd-68007)	[1] Campbell 2002 cites ref. 41	Table 4, p. 6, row 20 report
Cr3B4	Cr3B4	-42.9 kJ/mol-atom	model	-44.409 (mp-aaaaabif)	-44.171 (oqmd-68007)	[1] Campbell 2002	Table 4, p. 6, row 15 report
Cr3B4	Cr3B4	-40.8 kJ/mol-atom	model	-44.409 (mp-aaaaabif)	-44.171 (oqmd-68007)	[1] Campbell 2002 cites ref. 42	Table 4, p. 6, row 5 report
Cr3B4	Cr3B4	-40.3 kJ/mol-atom	model	-44.409 (mp-aaaaabif)	-44.171 (oqmd-68007)	[1] Campbell 2002 cites ref. 16	Table 4, p. 6, row 10 report
Cr5B3	Cr5B3	-40 kJ/mol-atom	model	-40.104 (mp-aaaaaxcr)	-40.349 (oqmd-5250)	[1] Campbell 2002 cites ref. 41	Table 4, p. 6, row 18 report
Cr5B3	Cr5B3	-36.7 kJ/mol-atom	model	-40.104 (mp-aaaaaxcr)	-40.349 (oqmd-5250)	[1] Campbell 2002 cites ref. 42	Table 4, p. 6, row 3 report
Cr5B3	Cr5B3	-34.2 kJ/mol-atom	model	-40.104 (mp-aaaaaxcr)	-40.349 (oqmd-5250)	[1] Campbell 2002	Table 4, p. 6, row 13 report
Cr5B3	Cr5B3	-31.2 kJ/mol-atom	model	-40.104 (mp-aaaaaxcr)	-40.349 (oqmd-5250)	[1] Campbell 2002 cites ref. 16	Table 4, p. 6, row 8 report
CrB	CrB	-45 kJ/mol-atom	model	-50.189 (mp-aaaaaaka)	-49.899 (oqmd-5878)	[1] Campbell 2002 cites ref. 41	Table 4, p. 6, row 17 report
CrB	CrB	-39.9 kJ/mol-atom	model	-50.189 (mp-aaaaaaka)	-49.899 (oqmd-5878)	[1] Campbell 2002 cites ref. 42	Table 4, p. 6, row 2 report
CrB	CrB	-39.4 kJ/mol-atom	model	-50.189 (mp-aaaaaaka)	-49.899 (oqmd-5878)	[1] Campbell 2002 cites ref. 16	Table 4, p. 6, row 7 report
CrB	CrB	-37.8 kJ/mol-atom	model	-50.189 (mp-aaaaaaka)	-49.899 (oqmd-5878)	[1] Campbell 2002	Table 4, p. 6, row 12 report

Other properties

Phase transition (9)

Phase transition, B–Cr system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	2136.15 K	2136.15	congruent melting: L -> BCC(Cr) BCC(Cr): B 0	experimental	[1] Campbell 2002 cites ref. 25	Table 2, p. 3, row 1 report
Phase transition	2180.15 K	2180.15	congruent melting: L -> BCC(Cr) BCC(Cr): B 0	experimental	[1] Campbell 2002 cites ref. 10	Table 2, p. 3, row 2 report
Phase transition	2348.15 K	2348.15	congruent melting: L -> β(B) β(B): B 1	experimental	[1] Campbell 2002 cites ref. 10	Table 2, p. 3, row 22 report
Phase transition	2360.15 K	2360.15	congruent melting: L -> CrB L: B 0.5; CrB: B 0.5	model	[1] Campbell 2002	Table 2, p. 3, row 10 report
Phase transition	2365.15 K	2365.15	congruent melting: L -> β(B) β(B): B 1	experimental	[1] Campbell 2002 cites ref. 26	Table 2, p. 3, row 21 report
Phase transition	2373.15 K	2373.15	congruent melting: L -> CrB L: B 0.5; CrB: B 0.5	experimental	[1] Campbell 2002 cites ref. 19	Table 2, p. 3, row 9 report
Phase transition	2373.15 K	2373.15	congruent transformation	experimental	[1] Campbell 2002	p. 5 report	The calculated congruent melting temperature of CrB is 13 degrees below the measured temperature of 2100 "C.
Phase transition	2430.15 K	2430.15	congruent melting: L -> CrB2 L: B 0.667; CrB2: B 0.667	model	[1] Campbell 2002	Table 2, p. 3, row 16 report
Phase transition	2473.15 K	2473.15	congruent melting: L -> CrB2 L: B 0.667; CrB2: B 0.667	experimental	[1] Campbell 2002 cites ref. 19	Table 2, p. 3, row 15 report

Crystal structure (31)

Crystal structure, B–Cr system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	14.71 Å	298.15	Cr2B alloy: B 0.333333, Cr 0.666667	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 1 report
Lattice a	14.692 Å	298.15	Cr2B alloy: B 0.333333, Cr 0.666667	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 2 report
Lattice a	2.984 Å	298.15	Cr3B4 alloy: B 0.571429, Cr 0.428571	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 8 report
Lattice a	2.946 Å	298.15	Cr3B4 alloy: B 0.571429, Cr 0.428571	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 9 report
Lattice a	5.468 Å	298.15	Cr5B3 alloy: B 0.375, Cr 0.625	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 4 report
Lattice a	5.46 Å	298.15	Cr5B3 alloy: B 0.375, Cr 0.625	experimental	[1] Campbell 2002 cites ref. 19	Table 1, p. 2, row 5 report
Lattice a	5.46 Å	298.15	Cr5B3 alloy: B 0.375, Cr 0.625	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 3 report
Lattice a	2.975 Å	298.15	CrB alloy: B 0.5, Cr 0.5	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 7 report
Lattice a	2.969 Å	298.15	CrB alloy: B 0.5, Cr 0.5	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 6 report
Lattice a	2.973 Å	298.15	CrB2 alloy: B 0.666667, Cr 0.333333	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 11 report
Lattice a	2.969 Å	298.15	CrB2 alloy: B 0.666667, Cr 0.333333	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 10 report
Lattice a	4.74 Å	298.15	CrB4 alloy: B 0.8, Cr 0.2	experimental	[1] Campbell 2002 cites ref. 21	Table 1, p. 2, row 12 report
Lattice b	7.41 Å	298.15	Cr2B alloy: B 0.333333, Cr 0.666667	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 1 report
Lattice b	7.399 Å	298.15	Cr2B alloy: B 0.333333, Cr 0.666667	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 2 report
Lattice b	13.02 Å	298.15	Cr3B4 alloy: B 0.571429, Cr 0.428571	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 8 report
Lattice b	13.018 Å	298.15	Cr3B4 alloy: B 0.571429, Cr 0.428571	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 9 report
Lattice b	7.866 Å	298.15	CrB alloy: B 0.5, Cr 0.5	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 7 report
Lattice b	7.858 Å	298.15	CrB alloy: B 0.5, Cr 0.5	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 6 report
Lattice b	5.477 Å	298.15	CrB4 alloy: B 0.8, Cr 0.2	experimental	[1] Campbell 2002 cites ref. 21	Table 1, p. 2, row 12 report
Lattice c	4.25 Å	298.15	Cr2B alloy: B 0.333333, Cr 0.666667	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 1 report
Lattice c	4.266 Å	298.15	Cr2B alloy: B 0.333333, Cr 0.666667	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 2 report
Lattice c	2.953 Å	298.15	Cr3B4 alloy: B 0.571429, Cr 0.428571	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 8 report
Lattice c	2.964 Å	298.15	Cr3B4 alloy: B 0.571429, Cr 0.428571	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 9 report
Lattice c	10.089 Å	298.15	Cr5B3 alloy: B 0.375, Cr 0.625	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 4 report
Lattice c	10.64 Å	298.15	Cr5B3 alloy: B 0.375, Cr 0.625	experimental	[1] Campbell 2002 cites ref. 19	Table 1, p. 2, row 5 report
Lattice c	10.46 Å	298.15	Cr5B3 alloy: B 0.375, Cr 0.625	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 3 report
Lattice c	2.934 Å	298.15	CrB alloy: B 0.5, Cr 0.5	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 7 report
Lattice c	2.932 Å	298.15	CrB alloy: B 0.5, Cr 0.5	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 6 report
Lattice c	3.07 Å	298.15	CrB2 alloy: B 0.666667, Cr 0.333333	experimental	[1] Campbell 2002 cites ref. 20	Table 1, p. 2, row 11 report
Lattice c	3.066 Å	298.15	CrB2 alloy: B 0.666667, Cr 0.333333	experimental	[1] Campbell 2002 cites ref. 18	Table 1, p. 2, row 10 report
Lattice c	2.866 Å	298.15	CrB4 alloy: B 0.8, Cr 0.2	experimental	[1] Campbell 2002 cites ref. 21	Table 1, p. 2, row 12 report

Sources

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

C.E. Campbell, U.R. Kattner, Assessment of the Cr-B system and extrapolation to the Ni-Al-Cr-B quaternary system, Calphad 26, 477-490 (2002). doi:10.1016/s0364-5916(02)00058-5

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}
}