HEATING EFFECT OF BATIO3 IN MICROWAVE FIELD AND MICROSTRUCTURE OF BATIO3

Microwave equipment at 2 450 MHz was employed to prepare BaTiO3. The h eating effect of the system in the microwave field, which was influenc ed by several factors including dielectric properties of synthesis sys tem and thermal insulate structures, was discussed in detail. The heat ing rates of the synthesis system were mainly determined by BaCO3 and TiO2 at low temperature and by TiO2 and BaTiO3 at high temperature. Th e results show that the heating effects in microwave field are greatly different from those in conventional furnace. The reaction of BaCO3 a nd TiO2 only lasts for 3 min at 1 100 degrees C, and the fine, narrow- distributed and well-crystallized powders were prepared.