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Intermediate Si-Al spinel phase formation in phase transformation of diphasic mullite gel

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Abstract

Al2O3-SiO2 diphasic mullite gel (Si/Al=1/3) has been synthesized by using Al(NO3)3·9H2O and Ludox in basic conditions. Its phase transformation behaviour has been studied by qualitative and quantitative X-ray diffraction techniques. The results indicate that a noncrystalline alumino-silicate phase forms together with the slow crystallization of Si-Al spinel phase of a mullite-like composition up to 1250 °C. Thereafter, it transforms suddenly to orthorhombic mullite around 1325 °C. Earlier studies, e.g. alkali leaching, and measurement of co-ordination number of aluminium in 1000 °C heated diphasic gel, confirm Si-Al spinel formation as an intermediary phase.

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  1. Central Glass and Ceramic Research Institute, 32, Calcutta, India

    A. K. Chakravorty

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  1. A. K. Chakravorty
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Chakravorty, A.K. Intermediate Si-Al spinel phase formation in phase transformation of diphasic mullite gel. JOURNAL OF MATERIALS SCIENCE 28, 3839–3844 (1993). https://doi.org/10.1007/BF00353188

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