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Peculiarities of structure and phase transformations of turbostratic BN under high pressure and temperature

G.Olieinyk,
 
I.A.Petrusha,
 
A.Kotko,
 
M.V.Nikishina
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Electron Microscopy and Strength of Materials - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2015, #21
http://www.materials.kiev.ua/article/1736

Abstract

The transformation of turbostratic BNt into the sphalerite phase BNs has been studied using TEM procedures on thin foils and split-off particles combined with microelectron diffraction. It was established that under the conditions for a quasihydrostatic compression under a pressure of 7 GPa the transformation starts at 1200 °C, whereas under 11 GPa it does at 900—1000 °C. In both cases, this process is anticipated by the formation of the ordered graphite-like phase BNg. On the basis of the peculiarities of the formed BNs structure, it was assumed that the BNg—BNs transformation occurs through a deformation mechanism. Full text download


BORON NITRIDE, GRAPHITE-LIKE, MICROELECTRON DIFFRACTION PATTERN, ORDERING, PRESSURE, SHAPING, SPHALERITE BORON NITRIDE, TURBOSTRATIC

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