Journal
PHYSICA B-CONDENSED MATTER
Volume 407, Issue 24, Pages 4712-4720Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2012.09.024
Keywords
Ferroelectric; Impedance; ac Conductivity
Categories
Funding
- Portuguese Foundation for Science and Technology (FCT) [SFRH/BPD/81032/2011]
- Council of Scientific and Industrial Research (CSIR), India
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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.
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