Author/Authors :
Zhang، نويسنده , , J. and Cui، نويسنده , , Q. and Li، نويسنده , , X. and He، نويسنده , , Z. and Li، نويسنده , , W. and Ma، نويسنده , , Y. and Guan، نويسنده , , Q. and Gao، نويسنده , , W. and Zou، نويسنده , , G.، نويسنده ,
Abstract :
The transition from sp2 to sp3 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.
