【摘要】 利用高分辨率（０．２ｎｍ）电子显微镜对经高温高压处理的ｈＢＮ－触媒体系中纳米尺度的产物进行了观察，并通过电子衍射方法确定了其中的ｈＢＮ、ｃＢＮ相。结果表明，ｈＢＮ、ｃＢＮ晶粒在２００～３００ｎｍ尺寸范围内时其自身结构已确定，但其外观不具有各自的晶体特征。推断该种尺寸的晶粒处于成核生长的初期阶段，从热力学公式粗略估算，临界晶粒尺寸在百纳米左右更多还原

【Abstract】 In the paper,the original products of hBN catalyst system after treatments under high pressure and high temperature were observed by EMS.hBN and cBN phases were determined by method of electron diffrection.The results show that self structure of these crystals is already formed in size 200～300nm.However,characteristic morpholoy of the crystals does not appeared.We guess that the crystals are in original growth.We also deduce that the size of the critical grain of the crystals is about 100nm.更多还原