Impedance Properties Of 0.7(BiFeO3)-0.3 (PbTiO3) Composite

Materials Research Laboratory, School of Physics, Sambalpur University, Jyoti Vihar Burla 768019, Odisha, India

Adv. Mater. Lett., 2013, Current Issue, 4 (2), pp 141-145

DOI: 10.5185/amlett.2012.6359

Publication Date (Web): Dec 09, 2012

Copyright © IAAM-VBRI Press

E-mail: banarjibehera@gmail.com

Abstract

The polycrystalline sample of 0.7(BiFeO₃)-0.3(PbTiO₃) [0.7(BFO)-0.3(PT)] was prepared by a high temperature solid state reaction technique. Studies of structural analysis confirm the formation of the compound with rhombohedral structure at room temperature. The electrical properties (impedance, modulus and conductivity) of the material were analyzed using a complex impedance spectroscopy technique in a wide temperature (225-300 ^oC) and frequency (10² -10⁶ Hz) range. The studied material exhibits a significant contribution of grain (bulk) effect and non-Debye of relaxation process. The bulk resistance decreases with rise in temperature which exhibits negative temperature coefficient of resistance (NTCR) behavior. Electrical modulus study confirms the presence of bulk effect in the material. This compound also exhibits the temperature dependence of relaxation phenomena. The ac and dc conductivity of the materials were found to be increase with increase in temperature. The activation energy of the compound is found to be less than 1eV and suggests the conduction process is of mixed type (ionic-polaronic and singly-ionized oxygen ion vacancies).

Keywords

X-Ray diffraction, complex impedance, modulus study, conductivity.