Microstructure and dielectric properties of PLZST ceramics prepared by a modified coprecipitation

Lead lanthanum zirconium titanium stannate (PLZST) has been synthesized by a modified coprecipitation in a polyvinyl alcohol (PVA) aqueous solution. X-ray diffraction (XRD) study shows single perovskite phase formation at 650 °C for 2 h. The average particle size of calcined powder was about 70 nm. The green pellets have been sintered at 1000 °C, 1050 °C, 1100 °C and 1150 °C for 2 h, respectively. Effect of sintering temperature on microstructure and dielectric properties has been investigated. Dense ceramics with average grain size about 2 μm were obtained at the relatively low temperature of 1050 °C for 2 h and dielectric constant of 1633 at 1 kHz has been observed. Also, a comparison of particle size and sintering process is made between the samples prepared by the modified coprecipitation and the conventional coprecipitation.