Abstract
The data first obtained by the authors on the transformation (at 1650 K) of the boron nitride rhombohedral phase into the hexagonal one in cut tubes have been discussed. The transformation occurs with the participation of basal shears and the formation of the intermediate structures in the form of multilayer polytypes. It has been concluded that the development of the transformation is caused by the relaxation of stresses in the tubes, which generate in them because of the anisotropy of thermal expansion and facilitate the development of plastic shear along the (0001) plane in rBN.
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Solozhenko, V.L., Petrusha, I.A., and Svirid, A.A., Thermal Phase Stability of Rhombohedral Boron Nitride, High Pressure Research, 1996, vol. 15, pp. 95–103.
Dedkov, V.S., Kabyshev, A.V., Konusov, F.V., et al., Properties of Pyrolytic Rhombohedral Boron Nitride, Neorganicheskie Materialy, 1996, vol. 32, no. 6, pp. 690–695.
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Original Russian Text © G.S. Oleinik, V.I. Lyashenko, 2008, published in Sverkhtverdye Materialy, 2008, Vol. 30, No. 5, pp. 3–6.
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Oleinik, G.S., Lyashenko, V.I. Mechanism of the rBN → hBN transformation in Nano-and Microtubes. J. Superhard Mater. 30, 287–289 (2008). https://doi.org/10.3103/S1063457608050018
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DOI: https://doi.org/10.3103/S1063457608050018