Coondoo, Indrani and Panwar, Neeraj and Tomar, Amit and Jha, A. K. and Agarwal, S. K. (2012) Impedance spectroscopy and conductivity studies in SrBi2(Ta1-xWx)(2)O-9 ferroelectric ceramics. Physica B: Condensed Matter, 407 (24). pp. 4712-4720. ISSN 0921-4526

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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.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Subjects: Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 12 Mar 2020 11:35
Last Modified: 12 Mar 2020 11:35

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