ISSN:2321-6212

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Electrical investigations of PbTiO3 ceramics with Pb/Ti contents fabricated through solid state sintering reaction method


13th International Conference on Advanced Materials and Nanotechnology

OCTOBER 26-28, 2017 OSAKA, JAPAN

Nasira Sareecha

Islamia University of Bahawalpur, Pakistan

Posters & Accepted Abstracts: Res. Rev. J Mat. Sci

DOI: 10.4172/2321-6212-C1-009

Abstract

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 °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 (σac) confirmed the presence of ferroelectric to para-electric phase transition. At room temperature, resistivity (ρ25) increased with increasing titanium contents. All specimens showed semiconductor behavior with Negative Temperature Coefficient of Resistivity (NTCR) characteristics; expanding drift mobility, µd 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.