Structural and Dielectric Properties of ZnO Added (Na1/2Bi1/2)TiO3 Ceramics

Structural and dielectric properties of polycrystalline samples of lead-free (1-x)(Na1/2Bi1/2)TiO3-xZnO, prepared using a high-temperature solid-state reaction method, were investigated in the composition range of 0≤x≤0.10. Rietveld analyses of X-ray diffraction data indicated the formation of a single-phase hexagonal structure with R3c symmetry. Williamson-Hall approach was applied to estimate the apparent particle size and lattice strain of the compounds. Temperature dependence of dielectric constant showed that the addition of ZnO to (Na1/2Bi1/2)TiO3 shifted the phase transition temperature towards higher side, a property favourable for practical applications of these ceramics. Further, temperature dependent permittivity data provided low temperature coefficient of capacitance (Tcc<8%) up to 100°C. Furthermore, a decrease in the value of dielectric loss with an increase in ZnO content was observed.