Abstract
Bismuth layer structured ferroelectric ceramics, Sr0.3Ba0.7Bi3.7La0.3Ti4O15 (abbreviated as SBBLT), were fabricated by conventional and two-step sintering techniques. The effects of sintering processes on microstructure and dielectric properties of Sr0.3Ba0.7Bi3.7La0.3Ti4O15 ceramics were investigated. Dense and homogeneous ceramic materials with grain size of 1-3 μm were obtained. The decrease of oxygen vacancies in the two-step sintered ceramics decreases the conductivity, and also dielectric constant and dielectric loss at high temperature. The Curie temperature is shifted from 408°C of conventionally sintered ceramics to 345°C of two-step sintered ceramics at a soaking time of 15 h, which might attributed to smaller rattling space resulting from the decrease of unit-cell volume. The conductivity at high temperature decreases with increasing soaking time. The decrease in the conductivity is about one order of magnitude in two-step sintered samples.
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