Electrical and Dielectric Relaxation Characterization of Ni1−x Zn x Ga0.5Fe1.5O4

Abstract

The ferrite system, Ni 1−x Zn x Ga 0.5 Fe 1.5 O 4 (x ranges from 0.0 to 0.5 in steps of 0.1), has been synthesized by a solid-state reaction technique. Single-phase cubic spinel structure was confirmed with X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) results. The effect of introducing zinc in the unit cell on the electrical properties was investigated in the ranges 10 2 -10 5 Hz and 300-600 K of frequency and temperature, respectively. Semiconducting behavior over all studied ranges of frequency and temperature was observed. This behavior is attributed to the cation-anion-cation interaction, which is most predominant at B-sites in these samples. Variation of the universal exponents with temperature indicates the presence of a correlated barrier hopping (CBH) mechanism. The determined transition temperature T C was found to decrease with increasing the compositional parameter x.