Induced effects of Zn+2 on the transport and complex impedance properties of Gadolinium substituted nickel-zinc nano ferrites

Kumar, Santhosh M V and Shankarmurthy, G J and Melagiriyappa, E and Nagaraja, K K and Jayanna, H S and Telenkov, M P (2019) Induced effects of Zn+2 on the transport and complex impedance properties of Gadolinium substituted nickel-zinc nano ferrites. Journal of magnetism and Magnetic materials, 478 (1). pp. 12-19. ISSN 0304-8853

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Abstract

We report on the preparation and transport properties of Gadolinium substituted Ni(1−x)ZnxGdyFe(2−y)O4 (0 ⩽ x ⩽ 1, y = 0.1) nano particles using low temperature citrate precursor combustion method. The Rietveld refinement of PXRD data suggests the crystal structure of sample belongs to Fd-3m space group with an octahedral occupation of Gd+3 ions. FESEM micrographs show the existence of porosity in the samples. The dielectric studies reveal the good dielectric behaviour with high dielectric constant in Zn+2 substituted sample (x=0.4). An increase in a. c conductivity observed in the Zn+2 substituted sample due to the hopping mechanism. The impedance spectroscopy of the samples shows the existence of high grain boundary resistance and an alternate switching of dielectric relaxation from non-Debye to Debye type. The activation energies and Curie temperature estimated using D. C. conductivity measurements drop linearly with an increase in Zn+2 concentration. We attribute the observed transport properties mainly to the hopping of Fe+2↔Fe+3 ions.

Item Type: Article
Uncontrolled Keywords: Nickel-zinc ferrites;Rietveld refinement;Impedance spectroscopy;Activation energy;Curie temperature
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 02 May 2019 04:19
Last Modified: 02 May 2019 04:19
URI: http://eprints.manipal.edu/id/eprint/153746

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