PREPARATION OF BORON NITRIDE OF CUBIC SYSTEM

摘要

PURPOSE:To prepare easily a boron nitride of cubic system having a large crystal particle size, by heating Sr3B2N4 or Ba3B2N4 and hexagonal boron nitride under the thermodynamic stable pressure of the boron nitride of cubic system at >= a specific temperature. CONSTITUTION:Sr3B2N4 or Ba3B2N4 and hexagonal boron nitride are heated under the thermodynamic stable pressure of boron nitride of cubic system at >=125 deg.C. By this method, since the tolerance value widths of temperature and pressure range are wide, the growth rate of crystal particle is controlled easily, so that high-purity and high-quality boron nitride crystal of cubic system having large particle diameter can be produced easily.