13.4B: Structures of the Elements
- Page ID
- 34137
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Allotropes of boron
Boron can be prepared in several crystalline and amorphous forms. The best known crystalline forms are α-rhombohedral, β-rhombohedral, and β-tetragonal. Under special circumstances, boron can form α-tetragonal, and γ-orthorhombic allotropes. Two amorphous forms, one a finely divided powder and the other a glassy solid, are also known and a further 14 allotropes have been reported.
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B12 icosahedral unit |
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α-rhombohedral |
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β-rhombohedral |
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γ-orthorhombic high pressure form |