Dielectric Relaxation, Complex Impedance Analysis and Magnetic Properties of Nickel Substituted Calcium Nano Ferrites for High Frequency Applications
In the present research article, the structural, dielectric properties and Magnetic properties of Nickel doped CaFe2O4 nano-particles (NCAF) prepared by propellant chemistry technique are being discussed. The prepared samples were characterized by Powder X-ray
diffraction (PXRD) for the confirmation of crystallinity as well as phase formation. The average crystallite size of the NCAF samples lies in the range of 27–54 nm. The morphology of the sample was studied by SEM which confirms the highly porous nature of the samples. The particle size
of the samples were analyzed by TEM using ImageJ software is in good agreement with crystallite size obtained by Debye sherers’ formula. The impedance analyzer and vibrating sample magnetometer (VSM) were employed to study Electrical and magnetic properties respectively. The dispersion
of the permittivity with frequency is explained using Maxwell-Wagner model of interfacial polarization in consonance with Koop’s theory. The cole–cole plot of NCAF samples shows semicircular arcs and suggests non-Debye nature of relaxation process. The M–H loop analysis of
NCAF samples confirms the ferromagnetic and soft nature. The magnetic parameters such as remanence (Mr
) saturation magnetization (Ms
), and magnetic moment (ηB
) are evaluated from the M–H loop. These parameters are found to increase
with increase in Ni2+, due to the decrease of relative number of Ca2+ ions in A-site which increases the A–B interaction. The NCAF nano composite shows high permittivity value (104) which makes these materials suitable for energy storage applications
and for EMI (Electromagnetic shielding) materials at high frequency. The remanent magnetization, saturation magnetization, and coerclivity reported on VSM curve suggests that the prepared NCAF samples are suitable magnetic recording and related industrial applications.
Keywords: A.C Conductivity; Cole–Cole Plot; Dielectric Properties; Impedance Spectroscopy; VSM
Document Type: Research Article
Affiliations: 1: Department of Physics, Sai Vidya Institute of Technology, Bengaluru 560064, India 2: Department of Physics, Don Bosco Institute of Technology, Bangalore 560074, India 3: Department of Physics, B.M.S. College of Engineering, Bengaluru 560019, India 4: Department of Physics, SJCIT, Chikkaballapura, Karnataka 562101, India 5: Department of Physics, Siddaganga Institute of Technology, B.H. Road, Tumkur 572103, India
Publication date: 01 November 2018
- Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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