Investigation of the Frequency-Dependent Dielectric Properties of the As-Prepared LaNiO3/Co3O4 Nanocomposites

Abstract

This article presents a detailed study of the dielectric properties, AC conductivity, electric modulus, and impedance spectroscopy of the LaNiO3/Co3O4 as-prepared nanocomposite. The composite was prepared using the modified citrate gel autocombustion method. Transmission electron microscopy and atomic force microscopy images revealed nonuniform nanoparticles of varying shapes and sizes. Impedance analysis indicated a negative temperature coefficient of resistance and semiconducting behavior of the nanocomposite. The Nyquist plot displayed one semicircular curve. The AC conductivity was found to be dependent on both temperature and frequency, adhering to Jonscher’s power law, with conductivity governed by a sudden hopping process. A high dissipation factor was observed, which decreased with frequency. A non-Debye relaxation type was defined for the nanocomposite.