LAUSR

Abstract The dielectric and electrical properties of praseodymium substituted MnFe 2 O 4 ferrite as a function of frequency (1 MHz–3 GHz) at room temperature have been studied. The dielectric constant and complex dielectric constant of these samples decreased with an increase of the praseodymium concentration, following the Maxwell–Wagner two-layer model. Complex impedance analysis has been used to separate the role of grains and the grain boundary's resistance of MnPr y Fe 2-y O 4 (y = 0.00, 0.025, 0.05, 0.075, 0.10. The values of the activation energy, calculated from the direct current conductivity, increase with the substitution of praseodymium, which suggests that the conduction mechanism in the present ferrite system is due to polaron hopping. The complex impedance plane plots show a single semicircle, which indicates that the capacitive and resistive properties of the materials are due to the contribution of grains and grain boundaries in ferrites. All these properties suggest that our prepared spinel ferrites are suitable for high frequency multilayer chip inductors.