AC Electrical Conductivity and Dielectric Properties of Perovskite (Pb,Ca)TiO 3 Ceramic

Pb1-xCaxTiO3 perovskite crystalline structure with x = 0, 0.2, 0.6, 0.7, and 0.8 were prepared by mixture method.The ac conductivity and dielectric properties of the studied bulk compositions have been investigated in the frequency range 1 × 10 3 5 × 10 6 Hz and temperature range 303473 K.The experimental results indicate that the ac conductivity σac(ω), dielectric constant ε ′ and dielectric loss ε ′′ depend on the temperature and frequency.The ac conductivity was found to obey the power law ω S with the frequency exponent S > 1 decreasing with increasing temperature.The present results are compared to the principal theories that describe the universal dielectric response behavior.Values of dielectric constant ε ′ and dielectric loss ε ′′ were found to be temperature and frequency dependent and the maximum barrier height Wm is calculated.