Mohanty, Suchismita and Kumar, Ashok and Choudhary, R. N. P. (2015) Studies of structural, dielectric, electrical and ferroelectric characteristics of BiFeO3 and (Bi0.5K0.5)(Fe0.5Ta0.5)O-3. Journal of Materials Science: Materials in Electronics, 26 (12). 9640-9648. ISSN 0957-4522

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Abstract

The polycrystalline samples of BiFeO3 and (Bi0.5K0.5)(Fe0.5Ta0.5)O-3 were prepared using a solid-state reaction technique. Using room-temperature X-ray diffraction data the formation of a single-phase hexagonal crystal system of (Bi0.5K0.5)(Fe0.5Ta0.5)O-3 was confirmed. Scanning electron micrographs confirming the polycrystalline nature of the samples contain uniform grain distribution of unequal size. Temperature-frequency dependence of dielectric studies does not show any dielectric anomaly or phase transition in the materials in the studied temperature range. However, existence of hysteresis loop at room temperature has confirmed the known ferroelectricity of BiFeO3 and (Bi0.5Li0.5)(Fe0.5Ta0.5)O-3. Analysis of complex impedance data has provided the amount of contributions of grain/grain boundary in the materials resistance. This analysis also shows that that the system has Negative temperature coefficient of resistance type behaviour. The electrical conductivity and relaxation characteristics of the system suggest the existence of thermally activated process, and their values suggest that the system has similar type of conductivity and relaxation species. The frequency dependence of the ac conductivity obeys Jonscher's universal power law.

Item Type:	Article
Subjects:	Engineering > Electronics and Electrical Engineering Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	21 Oct 2016 05:13
Last Modified:	21 Oct 2016 05:13
URI:	http://npl.csircentral.net/id/eprint/2010

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