B4Cr1
B4Cr1 has a DFT band gap of 0.13 eV across 10 reported structures in 5 space groups; its lowest-energy polymorph is orthorhombic (Pnnm (No. 58)). Cross-validated across 2 computational databases.
At a glance
Key Properties
Cross-validated computational properties for B4Cr1, aggregated across 2 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
0.13 eV
Range across DFT structures
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
0.000 eV/atom
Best (lowest) across sources
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
On hull (stable)
1 DFT source
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
10
2 databases, 5 space groups
Crystallography
Reported Structures
Lowest-energy structures reported for B4Cr1, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| Pnnm (No. 58) | orthorhombic | 0.00 | 0.0000 | -9.157 | 4.34 |
| Immm (No. 71) | orthorhombic | 0.13 | 0.0086 | -9.149 | 4.30 |
| Immm (No. 71) | — | — | — | — | — |
| Im-3m (No. 229) | — | — | — | — | — |
| Immm (No. 71) | — | — | — | — | — |
| Immm (No. 71) | — | — | — | — | — |
| Immm (No. 71) | — | — | — | — | — |
| Immm (No. 71) | — | — | — | — | — |
| I4/mmm (No. 139) | — | — | — | — | — |
| I4/m (No. 87) | — | — | — | — | — |
Reference
Frequently Asked Questions
Common questions about B4Cr1, answered from cross-validated data.
What is the band gap of B4Cr1?
B4Cr1 has a DFT-computed band gap of 0.13 eV across 10 reported structures.
More questions
Is B4Cr1 a metal, semiconductor, or insulator?
With a band gap up to 0.13 eV it is a semiconductor.
Is B4Cr1 thermodynamically stable?
Yes — B4Cr1 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of B4Cr1?
The lowest-energy reported polymorph of B4Cr1 is orthorhombic symmetry, space group Pnnm (No. 58).
What is the density of B4Cr1?
The computed density of the ground-state structure of B4Cr1 is 4.34 g/cm³.
How many polymorphs of B4Cr1 are known?
10 structures of B4Cr1 are reported across 2 databases, spanning 5 distinct space groups.
What elements does B4Cr1 contain?
B4Cr1 contains B and Cr (2 elements).
Where does the data for B4Cr1 come from?
B4Cr1 data is cross-referenced from materials_project, aflow.
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Related Compounds
Other Transition-Metal Borides in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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