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7163994 
Journal Article 
AC Electrical Conductivity and Dielectric Properties of Perovskite (Pb, Ca)TiO3 Ceramic 
El-Mallah, HM; , 
2012 
Yes 
Acta Physica Polonica. Series A: General Physics, Physics of Condensed Matter, Optics and Quantum Electronics, Atomic and Molecular Physics, Applied Physics
ISSN: 0587-4246 
POLISH ACAD SCIENCES INST PHYSICS 
WARSAW 
174-179 
WOS:000307259400035 
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 x 10(3)-5 x 10(6) Hz and temperature range 303-473 K. The experimental results indicate that the ac conductivity sigma(ac)(omega), dielectric constant epsilon' and dielectric loss epsilon '' depend on the temperature and frequency. The ac conductivity was found to obey the power law omega(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 epsilon' and dielectric loss epsilon '' were found to be temperature and frequency dependent and the maximum barrier height W-m is calculated.