1Department of Physics and Meteorology, I.I.T Kharagpur, West Bengal, 721302, India
2Department of Physics, Institute of Technical Education and Research SOA University, Bhubaneswar, India
Adv. Mater. Lett., 2012, 3 (2), pp 97-101
DOI: 10.5185/amlett.2011.4250
Publication Date (Web): Apr 14, 2012
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The polycrystalline sample of (K0.5Bi0.5)(Fe0.5Nb0.5)O3 was synthesized by a high- temperature solid-state reaction technique. The material crystallizes in cubic structure at room temperature. The dielectric properties of the material were investigated in a temperature range from 30-200 ºC in the frequency range (102–107 Hz). Impedance data is well fitted using proper equivalent circuit composed of a parallel resistance and capacitance in series with a parallel resistance, constant phase element and a capacitance. The compound shows a typical negative temperature coefficient of resistance type (NTCR) behavior like that of semiconductors. Modulus spectroscopy and dielectric conductivity formalism were employed to study dielectric relaxation phenomena in the material. The frequency dependence of conductivity is well fitted to Jonscher’s single power law.
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