Journal
CURRENT APPLIED PHYSICS
Volume 10, Issue 1, Pages 21-25Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2009.04.006
Keywords
Impedance spectroscopy; Barium iron niobate; Giant dielectric
Funding
- Royal Golden jubilee Ph.D. Program [PHD/0060/2547]
- Commission on higher education, Thailand, Graduate school and Faculty of Science, Chiang Mai University, Thailand and Department of Materials Science and Engineering, Faculty of Engineering
- National University of Singapore, Singapore
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Single-phase BaFe0.5Nb0.5O3 (BFN) ceramics were prepared by solid-state reaction method and were chatacterized by X-ray Diffraction (XRD) technique. Then, impedance spectroscopy measurements were conducted in a frequency range from 100 Hz to I MHz and in a temperature range from 293 to 600 K. Relaxation phenomena of non-Debye type have been observed in the BFN ceramics, as confirmed by the Cole-Cole plots. The higher values of epsilon' at the lower frequencies are explained on the basis of the Maxwell-Wagner (MW) polarization model. Complex impedance analysis enables us to separate the contributions from grains and grain boundaries Of Our samples. We found that at higher temperatures grain boundary resistance is higher than grain resistance, irrespective of composition. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
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