Spectroscopic analysis and temperature-dependent dielectric properties of bulk Ni-Zn ceramics

Abstract

In the present work, series of Zn ion-doped Ni1-xZn x Fe 2 O 4 (0.0≤x≤0.5) ceramics were prepared by the double sintered solid-state reaction route to find out the influence of Zn 2+ ions on the crystal structure, lattice structure and dielectric behavior of parent NiFe 2 O 4 . X-ray diffraction (XRD) study favors that all the prepared compounds belong to the cubic spinel structure. Lattice parameters found to have increasing value with increased Zn2+ ion substitution. The Raman scattering measurement discerns optical-active modes with blue shift as the doping increases. The dielectric constant (ϵ′) and dielectric tangent loss (tan′) decrease with an increase in frequency and at higher frequency, both become constant. Dielectric parameters observe nonlinear behavior with increasing Zn 2+ ion substitution. Room temperature dielectric constant of 10% Zn ion-doped NiFe 2 O 4 [Ni 0.9 Zn 0.1 Fe 2 O 4 ] is much higher as compared to other prepared ceramics. The room temperature ac conductivity is found to increase with increase in frequency and temperature-dependent ac conductivity increases with increase in temperature.