|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Temperature Dependence of the Dielectric Properties of Kaolin
||Stefan Csaki, Patrik Dobron, Igor Stubna, Libor Vozar, Viera Trnovcova, Jan Ondruska
|On-Site Speaker (Planned)
AC conductivity of kaolin (Sedlec region, Czech Republic) was investigated in a temperature range from 20 to 1100 °C at 10 selected frequencies from 500 Hz to 100 kHz. After the physically bound water is released, AC conductivity reaches its minima. The main charge carriers during dehydroxylation are OH- and H+ ions, while before and after dehydroxaltion Na+and K+ ions are the most important. A jump-like increase of the AC conductivity is observed around 950 °C, which is caused by the metakaolinite → Al-Si spinel transformation. The results of the auxiliary thermal analyses TGA, DSC, TDA reflected generally known facts about a release of the physically bound water, dehydroxylation, and metakaolinite → Al - Si spinel transformation. To avoid the temperature shifts of the processes investigated in different measurement units, the all thermal analyses were conducted with the heating rate of 5 °C/min.
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