AUTOR

AC Electrical Conductivity and Dielectric Properties of Perovskite (Pb, Ca)TiO3 Ceramic
H.M. El-Mallah
Department of Physics & Mathematical Engineering, Faculty of Engineering, Port-Said University, 42523 Port-Said, Egypt
Received: July 22, 2011; in final form April 14, 2012
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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 × 103 - 5 × 106 Hz and temperature range 303-473 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 ωS 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.
DOI: 10.12693/APhysPolA.122.174
PACS numbers: 71.45.Gm, 72.20.-i, 72.80.-r