Ceramics-Silikáty 21, (2) 147 - 150 (1977) |
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SINGLE-CRYSTAL STUDY OF THERMAL DECOMPOSITION OF SILLIMANITE |
Gyepesová Dalma, Ďurovič Slavomil |
Institute of Inorganic Chemistry, Slovak Academy of Sciences, 809 34 Bratislava, Dúbravská cesta 5
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The sillimanite-mullite transformation has been investigated by means of X-ray single-crystal methods. A single crystal of sillimanite Al[SiAlO5] was successively heated to temperatures up to 1650 °C. It turned out that sillimanite-like structure was preserved in the specimen until 1600 °C, accompanied from 1500 °C by polycrystalline corundum. Only the latter phase, together with glass, was observed in the specimen after heating to 1650 °C. The surprising occurrence of corundum after heat treatment of sillimanite suggests that the thermal decomposition of sillimanite to mullite might proceed through intermediate steps. |
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