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

M. V. Santhosh Kumar, G. J. Shankarmurthy, E. Melagiriyappa, K. K. Nagaraja, H. S. Jayanna, M. P. Telenkov

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Abstract

We report on the preparation and transport properties of Gadolinium substituted Ni (1-x) Zn x Gd y Fe (2-y) O 4 (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.

Original languageEnglish
Pages (from-to)12-19
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Volume478
DOIs
Publication statusPublished - 15-05-2019

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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