I.R. spectroscopy characterization of various types of structural irregularities in pyrolytic boron nitride

Article abstract of DOI:10.1007/BF00367846

Samples of pyrolytic BN ceramics were produced by CVD from BCl₃ -NH₃-N₂ mixtures at temperatures of 1300-2100°C, pressures 1-20 torr and varying partial pressures of the components. A theoretical analysis of the dependences of i.r. spectral band frequencies on interlayer distance and crystal block size is given. Five BN structure modifications have been found in BN ceramics from i.r. band shape analysis: hexagonal graphite-like, partially ordered, turbostratic, dense amorphous and highly dispersed amorphous, whose relative content strongly depends on the synthesis conditions.