Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
74 (1993), S. 2440-2444
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Rhombohedral forms of layered boron nitride (r-BN) as mixtures with copper powders were shock compressed and quenched from pressures in the range 8–50 GPa. Recovered specimens were investigated by x-ray diffraction and electron microscopy. The graphite-like BN (h-BN) and turbostratic BN (t-BN) phases are observed in the pressure range 8–22 GPa and wurtzite-type BN (w-BN) in the range 17–39 GPa. The zincblende-type BN (c-BN) phase is identified from specimens subjected to high shock temperatures and consists of very fine grains mostly less than 10 nm. The mechanism of phase transformation of r-BN to c-BN is proposed to occur through two paths: (i) direct conversion by relatively strong shocks and (ii) indirect, kinetically controlled conversion via intermediate phases by shock loadings generating relatively weak pressures (〈50 GPa). The possible intermediate phases are h-BN, t-BN, and w-BN.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.354680
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