Abstract
Boron nitride with the wurtzite structure forming as a result of phase transformation from graphitelike BN subjected to shock compression is distinguished by its high level of lattice distortions, which result in both diffuseness of lines in x-ray diffraction photographs and the displacement of some lines from their ideal structure positions. The level of distortions of one type, interpreted in terms of the size of coherent scattering regions (CSR) and lattice strain compensated within the limits of CSR, can be appreciably lowered by chemical means, through the dissolution of the most defective grains. Another type of distortions, linked with uncompensated extension of the coordination tetrahedron along the c axis, is independent of the concentration of distortions of the first type and constitutes a characteristic of the structure of the wurtzitetype boron nitride modification forming under the action of shock compression.
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