Negi, N. S. and Sharma, Anshu and Shah, J. and Kotnala, R. K. (2014) Investigation on impedance response, magnetic and ferroelectric properties of 0.20(Co1-xZnxFe2-yMnyO4)-0.80(Pb0.70Ca0.30TiO3) magnetoelectric composites. Materials Chemistry and Physics, 148 (3). pp. 1221-1229. ISSN 0254-0584

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Abstract

In the present work, we report on structural, dielectric, multiferroic, magnetoelectric properties and impedance spectroscopic studies of 0.20(Co1-xZnxFe2-yMnyO4)-0.80(Pb0.70Ca0.30TiO3) (x = 0.4, y = 0; x = 0, y = 0.2 and x = 0.4, y = 0.2) composites. The composites were prepared by metallo-organic decomposition (MOD) route. The coexistence of a cubic spinel phase and a tetragonal phase in the composites is confirmed by the X-ray diffraction measurement. Scanning electron micrographs show well distributed ferrite and ferroelectric phases in the composites. The dielectric properties of the composites have been studied in a wide range of frequency at different temperatures. The temperature dependent dielectric properties of the composites reveal that the ferroelectric-paraelectric transition temperature lies in the range of 499-546 degrees C. The impedance spectroscopic measurements of the composites indicate non-Debye type dielectric relaxation. The grain and grain boundary contributions in the composites have been separated using impedance spectroscopy analysis. The magnetization hysteresis (M-H) loop of the composites shows ferrimagnetic behavior with saturation magnetization values M-s similar to 12-13.4 emu/g and coercive field H-c similar to 71-273.5 Oe. The Curie temperature of the composites as determined from the inverse susceptibility vs. temperature curves is in the range of 297-480 degrees C. All the composites exhibit typical ferroelectric hysteresis loops indicating the presence of spontaneous polarization. A maximum value of magnetoelectric coupling co-efficient alpha similar to 17.4 mV/cm Oe has been observed for the composite with x = 0.4 and y = 0.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S Elsevier.
Uncontrolled Keywords:	Ceramics Chemical synthesis Electrical properties Magnetic properties
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	16 Oct 2015 07:33
Last Modified:	16 Oct 2015 07:33
URI:	http://npl.csircentral.net/id/eprint/1357

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