IR-spectra and phases structure of sialons

IR-spectra of Si-Al-O-N system ceramic materials with prevailing phase maintenance-X-phase, beta-sialon, 15R obtained by carbothermal reduction and simultaneous nitration of kaolin at various proportions of kaolin and carbon were studied. Complex contours of absorption bands are divided into separate components. Separate components contours are approximated with Gauss function. Integral intensities of absorption bands are calculated. The totality of IR-spectra data of silicon and aluminium nitride absorption spectra, corundum as well as kaolin absorption spectra was used for interpretation of sialon spectra. It was shown that IR spectroscopy data correlate well with chemical structure of examined sialons and allow to obtain information enlarging X-ray data. (C) 2002 Elsevier Science B.V All rights reserved.