Islamia University of Bahawalpur, Pakistan
Posters & Accepted Abstracts: Res. Rev. J Mat. Sci
Polycrystalline PbTiO3 ceramics were fabricated through solid state sintering reaction method at Pb/Ti molar ratio of x=1.00, 0.98 and 0.94. Keeping the technological position of PbTiO3 ceramics for variety of applications; electrical investigations of crack free sintered PbTiO3 ceramics were struggled under varying processing parameters in the wide spread spectrum of temperature from 40-700 Â°C at 1k Hz frequency. Stoichiometry and sintering regime strongly influenced the phase transition (TC) of PbTiO3 ceramics; compositions-1.00 and 0.98 showed sharp phase transition predominantly at 490oC. Impedance spectroscopy revealed dielectric anomalies with a relaxor like behavior at higher temperatures. The temperature dependence of alternative current conductivity (Ïac) confirmed the presence of ferroelectric to para-electric phase transition. At room temperature, resistivity (Ï25) increased with increasing titanium contents. All specimens showed semiconductor behavior with Negative Temperature Coefficient of Resistivity (NTCR) characteristics; expanding drift mobility, Âµd through increasing temperature concerted the rise in conductivity. The bulk conductivity followed the Arrhenius law with Ea=2.3265- 2.6269, 0.8302-0.7246 and 1.7665-0.3889 eV which can be attributed to the ionic conduction governed by V''Pb, V'O and V''O vacancies. Dielectric studies at PbTiO3 ceramics fabricated with optimal 0.98 compositions have potential application for high temperature applications.