Influence of A-site substitution on dielectric and impedance behavior of Mn3O4 spinels

Abstract

Abstract In this paper, we report the influence of A-site substitution on dielectric and electrical behavior of Mn3O4 based modified spinels at room temperature. All the three spinels substituted with Mn, Zn and Co at A-site showed slight decrease in relative permittivity (ε′) and dissipation factor (tanδ) in the studied frequency range of 40 Hz to 8 MHz. However, the influence of A-site substitution was noticeable because of it dominant influence on relative permittivity and dissipation factor over pure Mn3O4 spinel. The relative permittivity increased from ∼ 16 to 95 after substitution of Zn in A-site whereas the substitution of Co increased the magnitude upto 40. Similar trend was observed with tan δ measurement after A-site substitution. The frequency dependent impedance measurement revealed the better conducting behavior of pure and modified spinels because of its low impedance range and better frequency dependent ac-conductivity.