Influence of temperature on the dielectric behaviour of Co²⁺ substituted Li-Ni-Mn ferrites

Abstract

Li-Ni-Mn ferrites substituted with Co²⁺ having compositional formula Li₀․₄₅₋x/₂Ni₀․₁Mn₀․₁CoxFe₂․₃₅₋x/₂O₄ with x ranging from 0 to 0.1 in steps of 0.02 were prepared by the conventional ceramic technique. The temperature dependence of the dielectric constant and loss tangent have been investigated. The dielectric constant increased with the increase of temperature, the increase being more pronounced at lower frequencies indicating the dominant role played by the interfacial polarisation. Dielectric constant studied as a function of temperature showed peaks, which gets shifted to higher temperature as the frequency increased. The dielectric loss tangent was observed to increase with temperature. The results obtained are explained on the basis of Debye’s equation.