Structural and dielectric behavior of Cr{sup 3+} and Gd{sup 3+} substituted Ni-Zn nano ferrites
A series of Gd{sup 3+} doped nano crystalline Ni{sub 0.6}Zn{sub 0.4}Cr{sub 0.5}Gd{sub x}Fe{sub 1.5-x}O{sub 4} (where x=0. 00, 0.02, 0.04, 0.06) were prepared by solution combustion method using oxalyl dehydrazide (ODH) as a fuel. The Structural and dielectric behavior of as synthesized material was characterized through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR). XRD pattern reveals that the formation of single phase with cubic spinel structure. The average crystallite size and lattice parameter were found to increase with increasing Gd{sup 3+} concentration. The FTIR spectra shows two strong absorption bands at 387 cm{sup −1} and 564 cm{sup −1} both represents tetrahedral and octahedral stretching bonds respectively. The dielectric properties were carried out as a function of frequency and composition with the frequency range 40Hz to 10MHz. All the samples show the collective contribution of n-type and p-type carriers. The permittivity were found to decrease with increasing of Gd{sup 3+} concentration this is due to hopping off electrons and charge transport which is typical characteristic of polar dielectrics. Complex impedance was studied to know the contribution of grains and grain boundary resistance has explained according to the Maxwell Wagener type two layer model.
- OSTI ID:
- 22606564
- Journal Information:
- AIP Conference Proceedings, Vol. 1728, Issue 1; Conference: ICC 2015: International conference on condensed matter and applied physics, Bikaner (India), 30-31 Oct 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
CHARGE TRANSPORT
CHROMIUM COMPOUNDS
CONCENTRATION RATIO
DIELECTRIC MATERIALS
DOPED MATERIALS
FERRITES
FOURIER TRANSFORM SPECTROMETERS
FOURIER TRANSFORMATION
FREQUENCY DEPENDENCE
GADOLINIUM ADDITIONS
GRAIN BOUNDARIES
INFRARED SPECTRA
LATTICE PARAMETERS
NANOSTRUCTURES
NICKEL COMPOUNDS
PERMITTIVITY
X-RAY DIFFRACTION
ZINC COMPOUNDS