Effect of Bi and Li co-substituted SrTiO3 ceramics on structural and dielectric properties

Polycrystalline Sr(1-x)(Bi, Li)(x)TiO3 ceramics (x = 0 and 0.02) are prepared by a microwave processing method. The effect of co-substitution on structural, dielectric properties and ac-conductivity were investigated. The XRD of ceramics shows single phase with cubic structure. The lattice parameter of the compounds is estimated from the XRD patterns which confirm the incorporation of Bi and Li in SrTiO3 ceramics. Studies revealed that the dielectric constant and dielectric loss increased with an increase of temperature and decreased with an increase in frequency. The maximum dielectric constant obtained at room temperature is around 570 and increased to around 10(4) at 600 A degrees C measured at 1 kHz frequency whereas the maximum dielectric loss measured was 0.048 at 600 A degrees C and the loss measured at room temperature is 0.02. The activation energy of the samples were investigated using Arrhenius plots.