Structural and dielectric properties of Na0.7Bi0.3TiO3

Na0.7Bi0.3TiO3 pervoskite were developed through solid state reaction method. The formation of rhombohedral crystal structure was confirmed from the XRD and rietveld refinement. Dielectric properties of the sample were studied in the frequency range 1kHz to 5MHz in temperature range from room temperature to 400°C. Dielectric constant and tangent loss increases with increase in temperature and decrease with increase in frequency for prepared composition. AC conductivity pattern obey Jonscher’s power law and appears nearly constant at lower frequencies and increases at higher frequencies. Dc conductivity and corresponding activation energy for the prepared composition were measured. DC conductivity obeys Arrehenius relation. Dc conductivity and activation energy increases as temperature increases.