초미분 질화붕소의 제조에 관한 연구 (1) ( 기상반응법에 의한 질산붕소의 생성 )

To obtain fundamental informations for fine hexagonal boron nitride powders, the preparation of fine hexagonal boron nitride powders by vapor phase reaction procedures of BCl₃with NH₃has been carried out in the temperature range of 700-1400℃. The effects of reaction conditions on particle size and morphology of hexagonal boron nitride powders have been investigated by utilizing X-ray diffraction, SEM and IR spectroscopy techniques. The synthesis temperature of the h-BN crystal is higher than 1100℃. The h-BN crystal was obtained by heating at 1100℃ or higher in NH₃ambient again the reaction products which was obtained in the temperature range of 700-1100℃. The size of the reaction products obtained at 1400℃ is about 0.1 ㎛ and the shape of h-BN is spherical. Crystallite size and lattice parameter are found to have little influence in the molar ratio of BCl₃and NH₃. Temperature dependence of the crystasllite size is weak and the lattice parameters a and c decreases gradually with increasing reaction temperature.