HYPOTHETICAL MODEL OF TURBOSTRATIC LAYERED BORON-NITRIDE

Characteristics of stacking faults in layered boron nitride were studi ed. For this purpose, a low-temperature (turbostratic) form of powder was synthesized. The powder was hot-pressed, and in a series consistin g of 75 ceramic specimens, the density, hardness, Young's modulus and graphitization index were measured, Based on results of mathematical a nalysis of the relationships between the physical parameters, diffract ion patterns and microscopic observations, a hypothetical model of tur bostratic disorder in layered boron nitride crystals has been proposed regarding tilting between boron nitride layers, which results in site s with enhanced overlapping of electronic orbitals. Both sp(2) and sp( 3) with the symmetry of trigonal pyramid are considered to contribute to the state of hybridization of electronic orbitals.