Abstract
Structural features and mechanisms of transformation of graphite-like rhombohedral boron nitride modification (rBN) into the diamond-like wurtzite (wBN) and zinc blende (zBN) types have been studied. The puckering mechanism of the rBN→zBN transformation in shock waves was first proved structurally. It has been found that in static compression of CVD rBN (8 GPa, 20–2600 °C), transformations occur in the following sequence: rBN→(S,T)→I g→wBN→I d→cBN, where (S,T) are structures deformed via basal shears or twinning, and I g and I d are intermediate graphite- and diamond-like structures, respectively. The structure of wBN formed from rBN has been shown to be much more disordered than that of wBN obtained from the BN hexagonal modification (hBN).
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