Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 29, Issue 16, Pages 14248-14260Publisher
SPRINGER
DOI: 10.1007/s10854-018-9558-2
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Funding
- Department of Science and Technology, India under INSPIRE Scheme DST/INSPIRE Fellowship [2014/IF140812]
- VSM, DST, India [EMR/2014/000341]
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Cobalt ferrites nanoparticles doped with gadolinium CoFe2-x Gd (x) O-4, referred to as CFGO (x = 0.0, 0.1, 0.3, 0.5 and 0.7) was achieved by glycine nitrate process. The phase confirmation and crystallite size were obtained from X-ray diffraction spectra and their variation with dopants content was determined. The Williamson-Hall plot was used to investigate the individual contributions of crystallite sizes and lattice strain on the peak broadening of the CFGO nanoparticles. Further confirmation of the spinel structure was done by Fourier transform infrared spectra. Dielectric properties such as dielectric constant (epsilon') and dielectric loss (epsilon aEuro(3)) have been investigated in the frequency range 100 Hz-1 MHz. The dielectric constant (epsilon') dispersion for CFGO nanoferrites is fitted in accordance with the modified Debye's function. The complex impedances and complex modulus analysis confirm a grain interior mechanism contributing to the dielectric properties. The electrical behaviour of the CFGO nanoferrites exhibited small polaron conduction mechanism. From the temperature dependence curve of dielectric relaxation, activation energies for CFGO samples have been calculated. The low loss dielectric makes these samples promising materials to be used at high frequencies.
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