NSU Research Contributions

Title : Effect of annealing temperature on the structural, dielectric andelectric properties of Ni0.7Cd0.3Fe2O4ferrites

Authors : M ARIFUZZAMAN?, M B HOSSEN, M H RASHID, M S AHMED and M S ISLAM

Abstract : A composition of Ni0.7Cd0.3Fe2O4(NCF) ferrite nanoparticles was synthesized by a sol–gel auto-combustiontechnique. The particles in powder form were annealed at 550 and 700?C to study the structural, dielectric and electricproperties of NCF by using X-ray diffraction (XRD), field emission scanning electron microscopy, impedance and modulusspectroscopy. XRD patterns confirmed the single phase cubic spinel structure of the sample. The average crystallite size ofNCF was found to be 17 nm at 550?C and 31 nm at 700?C, respectively. The variation in complex dielectric constant, losstangent and impedance along with the modulus properties of NCF with frequencies was observed at room temperature becauseof their size and annealing temperature. Notably, dielectric dispersion of the materials was observed at low frequenciesbecause of Maxwell–Wagner interfacial polarization. The impedance and modulus spectroscopy were used to investigatethe electric properties of the materials, which revealed the increase in grain and grain boundary resistance with annealingtemperature. A non-Debye type of relaxation in the materials was evidenced through the Cole–Cole study of impedance andmodulus spectra.

Journal : Bulletin of Materials Science	Volume : 43	Year : 2020	Issue :
Pages : 155	City :	Edition :	Editors :
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