Abstract
Boron carbide crystals of various compositions were studied by X-ray powder diffraction in the temperature range of 25-700 °C. The formation of a metastable structure of boron carbide under the conditions of self-propagating high-temperature synthesis was detected. Its metastability manifested in a decrease of the unit cell volume after the first heating-cooling cycle. The cell volume change disappeared in all the subsequent heating-cooling cycles. For B12C3 crystals this effect did not occur. The metastability of boron carbide crystals was explained by the presence of C and/or B atoms in crystalline structure channels and their motion along the channels and up to position of structural vacancies under the temperature increasing.
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