Abstract
Chromium substituted cobalt zinc (Co0.8 - xZn0.2CrxFe2O4; (0 <= x <= 0.1; step 0.02), referred to Co-Zn-Cr) nanoferrite materials were synthesized by citrate nitrate combustion method. The effect of Cr(3+)dopant on the crystal structure, magnetic properties, dielectric properties, electrical transport and impedance analysis of Co-Zn nanoferrites was predestined. The cubic spinel phase formation without any impurity phase for Co-Cr-Zn nanoferrites was assured by XRD, FTIR and HRTEM analysis. Magnetic parameters displayed a peculiar demeanor as a function of Cr content, based on the crystallite size impact. Dielectric phenomena versus frequency and temperature were discussed relying on charge carriers (electrons and holes) hopping between diverse ions. Complex impedance analysis revealed the entity of electrical relaxations in the investigated samples besides the predominant of grain boundaries contributions to the conduction process. A distinctive attitude for dielectric parameters was obtained with Cr dopant, regarding the cation-anion and cation-cation bond length. The nanoferrite Co0.72Zn0.2Cr0.08Fe2O4 has the optimum magnetic and dielectric properties, which qualifies it for recording media and high frequency devices.