Dielectric properties of Bi{sub}2O{sub}3-ZnO-Ta{sub}2O{sub}5 ceramics sintered by microwave

摘要

Here we report dielectric studies carried out on a Bi{sub}2Zn{sub}(2/3)Ta{sub}(4/3)O{sub}7 (abbreviated as (3-BZT) composition. The material was synthesized by conventional ceramic method and microwave sintering processing. The dielectric properties were studied as a function of frequency and temperature. Dielectric constant of Bi{sub}2Zn{sub}(2/3)Ta{sub}(4/3)O{sub}7 ceramics prepared from microwave is slightly smaller than that of the conventional sintered ones. The dissipation factor and temperature coefficient of dielectric constant are low for microwave-sintered samples. Microwave sintering of Bi{sub}2Zn{sub}(2/3)Ta{sub}(4/3)O{sub}7 ceramics led to higher densification and the fine microstructure in much shorter time duration compared to conventional procedures, improved microstructure and dielectric properties. To achieve the same densification, it requires 4 h of soaking at the same temperature in conventional sintering process. Microwave sintering method may lead to energy savings because of rapid kinetics of synthesis.