Processing and dielectric properties of Bi-doped Sr(Ti0.95Zr0.05)O3 ceramics

This paper investigates Bi-doped Sr(Ti0.95Zr0.05)O3 ceramics prepared by solid state method. Both the effect of grinding time on particle size distribution of ceramic powders and the effect of sintering temperature on microstructure and dielectric properties of ceramics are studied. The samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). Apparent density measurements and their dielectric properties are established at room temperature. XRD analysis shows that the ceramics kept cubic perovskite structure with the grain size about 1–2 μm observed by SEM image. The relative density of the obtained materials reaches higher than 94% and they exhibit properties as follows: dielectric constant ɛr > 500 and dielectric loss tanδ < 6.0 × 10−3 under 1 MHz and the breakdown strength Eb > 10 kV/mm.