Crystal Structure of 27R-SiAlON Synthesized Under
Carbothermal Nitridation |
Mita Biswas, Aditi Sahoo, K. Muraleedharan and Siddhartha Bandyopadhyay*
Pages : 1-5
DOI : 10.1080/0371750X.2020.1852972 |
Abstract |
Laboratory synthesized (carbothermal-reduction-nitridation) 27R-SiAlON is studied
in terms of crystallographic and microscopic features by detailed X-ray diffraction
and electron microscopy experiments. 27R-SiAlON is analyzed to possess
rhombohedral R3m structure and is best represented as Si1.1Al7.9O1.9N8.1. Lattice
parameters, ion positions, bond lengths, angles as well as the crystallite size and
strain have been determined for the constituent phase. The R3m phase in hexagonal
setting exhibits enormous anisotropy with pseudo-tetragonality ratio c/a6 ~10. The
electron microscopy too offers evidence of preferential growth of platelike crystals of
SiAlON due to its large c-axis.
[Keywords: 27R-SiAlON, Crystal structure, Distortion, Anisotropy] |
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