Abstract

The transition from sp 2 to sp 3 hybridization in boron nitride has been induced in plasma. Nano-crystals of cubic boron nitride (cBN) have been synthesized by direct current arc discharge method using hexagonal boron nitride (hBN) as the starting material. The characterization of the as-grown powders is carried out by X-ray diffraction, Fourier transform infrared spectroscopy and transmission electron microscopy. It has been shown that cBN and hBN grains with 20–60 nm in size co-exist in the powders. A reaction route of sublimation – re-hybridization – crystallization had been put forward to explain the mechanism of the hybridization transition and the growth of cBN by this method.

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