Abstract

The solubility of vanadium in β-rhombohedral boron has been studied by single crystal diffractometry for two crystals of composition VB ∼65 and VB ∼165. The space group is R 3m and the hexagonal cell dimensions are a = 10.972 Å, c = 23.908 Å for VB ∼65 and a = 10.949 Å, c = 23.840 Å for VB ∼165. At the higher concentration of vanadium, the same two sets of holes are occupied as in CrB ∼41 and FeB ∼49. The boron framework is essentially the same as in undoped β-rhombohedral boron. Vanadium is found to expand the unit cell slightly.

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