Impedance spectroscopy and conductivity studies in SrBi2(Ta1-xWx)(2)O-9 ferroelectric ceramics
authors Coondoo, I; Panwar, N; Tomar, A; Jha, AK; Agarwal, SK
nationality International
journal PHYSICA B-CONDENSED MATTER
author keywords Ferroelectric; Impedance; ac Conductivity
keywords MODULUS SPECTROSCOPY; COMPLEX IMPEDANCE; SRBI2TA2O9; RELAXATION; TRANSPORT; GLASSES; OXIDES
abstract Complex impedance spectroscopy (CIS) technique has been utilized to investigate the intra- and intergranular contributions to the impedance in pristine and wolframium (tungsten, W) -substituted strontium bismuth tantalate [SrBi2(Ta1-xWx)(2)O-9 (SBTW); x=0.0, 0.025, 0.05, 0.075, 0.1 and 0.2] ceramics as a function of temperature and frequency. CIS studies reveal that the electrical relaxation process was temperature dependent and non-Debye type. The temperature dependence of the relaxation time was found to obey the Arrhenius law. DC conductivity of the studied samples obtained from the CIS data decreased for W content upto x=0.05, followed by a subsequent increase with x > 0.05. Electrical conductivity data including the typical values of the activation energies at high temperature indicated that the conductivity in the studied ceramics was essentially due to the contribution of doubly ionized oxygen vacancies to the conduction process. (C) 2012 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0921-4526
year published 2012
volume 407
issue 24
beginning page 4712
ending page 4720
digital object identifier (doi) 10.1016/j.physb.2012.09.024
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000311026800018
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