Observation on Original Crystals of hBN and cBN by EMS

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 diffraction. The results show that self-structure of these crystals is already formed in size 200～300 nm. However, characteristic morphology of the crystals does not appear. We guess that the crystals are in original growth. We also deduce that the size of the critical grain of the crystals is about 100 nm.