Impedance study of giant dielectric permittivity in BaFe0.5Nb0.5O3 perovskite ceramic |
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| Authors: | Uraiwan Intatha Sukum Eitssayeam John Wang Tawee Tunkasiri |
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| Institution: | aSchool of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand;bDepartment of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50202, Thailand;cDepartment of Materials Science and Engineering. Faculty of Engineering, National University of Singapore, Singapore 117576, Singapore |
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| Abstract: | Single-phase BaFe0.5Nb0.5O3 (BFN) ceramics were prepared by solid-state reaction method and were characterized by X-ray Diffraction (XRD) technique. Then, impedance spectroscopy measurements were conducted in a frequency range from 100 Hz to 1 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 ε′ 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. |
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| Keywords: | Impedance spectroscopy Barium iron niobate Giant dielectric |
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