|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Temperature Dependence of the AC Conductivity of an Illitic Clay with Calcite Addition
||Stefan Csaki, Ján Ondruška, Patrik Dobroň, Viera Trnovcová, Igor Štubňa, Tomáš Húlan, Libor Vozár
|On-Site Speaker (Planned)
AC conductivity of mixtures prepared from an illitic clay (Hungary) and calcite was investigated in the temperature range from 120 °C to 1100 °C at 20 selected frequencies from 500 Hz to 4 MHz. During heating (up to 200 °C), OH- and H+ ions, which are the products of the physically bound water dissociation, were the dominant charge carriers. In the temperature interval from 200 °to 400 °C loosely bound alkali ions were dominating the AC conductivity. Above 400 °C, the release of the chemically bound water supported the conduction mechanism through the diffusion of OH- groups. The decomposition of calcite occurred between 700 °and 900 °C, thus Ca2+ ions became dominant charge carriers. The results of the AC conductivity measurements were supported by auxiliary thermal analyses –DTA, TG, and DIL. To avoid the temperature shifts of the, the all thermal analyses were carried out with heating rate 5°C/min.
||Planned: None Selected