Structural and frequency dependent dielectric properties of Ba doped Ni–Zn ferrite powders

Abstract

In this work, Ba doped Ni–Zn ferrite (Ni_0.8-xBa_xZn_0.20Fe₂O₄ (x = 0.1, 0.5, and 0.7) were prepared by sol-gel method. The X-ray diffraction pattern confirmed the structure of the samples to be cubic spinel structure with Fd3m space group. The average crystallite size and lattice parameters were found to increase with increase in Ba doping concentration. Fourier transform infrared spectroscopy ascertained the spinel structure by displaying the characteristic absorbance bands for the Ba doped Ni–Zn ferrite. Enhanced dielectric constant and reduced dielectric loss were obtained. The electronic conducting property of the ferrites were studied using impedance spectroscopy. The Cole–Cole plots were helpful in bringing out the non-Debye relaxation prevalent in the doped samples. These Ba doped Ni–Zn ferrites are expected to be potential candidates in high frequency electronic applications and magnetic memory devices.

Graphical Abstract

Keywords:

• Doped Ni–Zn ferrite
• sol-gel method
• dielectric
• Cole–Cole plots