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

Research output: Contribution to journalArticle

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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Gadolinium
Ferrites
gadolinium
Nickel
Transport properties
Zinc
ferrites
zinc
nickel
impedance
Ions
Rietveld refinement
Dielectric relaxation
Curie temperature
Citric Acid
Grain boundaries
Permittivity
Activation energy
Porosity
Crystal structure

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Santhosh Kumar, M. V. ; Shankarmurthy, G. J. ; Melagiriyappa, E. ; Nagaraja, K. K. ; Jayanna, H. S. ; Telenkov, M. P. / Induced effects of Zn +2 on the transport and complex impedance properties of Gadolinium substituted nickel-zinc nano ferrites. In: Journal of Magnetism and Magnetic Materials. 2019 ; Vol. 478. pp. 12-19.
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Induced effects of Zn +2 on the transport and complex impedance properties of Gadolinium substituted nickel-zinc nano ferrites. / Santhosh Kumar, M. V.; Shankarmurthy, G. J.; Melagiriyappa, E.; Nagaraja, K. K.; Jayanna, H. S.; Telenkov, M. P.

In: Journal of Magnetism and Magnetic Materials, Vol. 478, 15.05.2019, p. 12-19.

Research output: Contribution to journalArticle

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AU - Santhosh Kumar, M. V.

AU - Shankarmurthy, G. J.

AU - Melagiriyappa, E.

AU - Nagaraja, K. K.

AU - Jayanna, H. S.

AU - Telenkov, M. P.

PY - 2019/5/15

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N2 - 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.

AB - 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.

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