Electrically heterogeneous high dielectric BaTi0.4(Fe0.5Nb0.5)(0.6)O-3 ceramic

摘要

The effect of sintering temperatures on the lattice parameters, microstructure and electrical properties of BaTi0.4(Fe0.5Nb0.5)(0.6)O-3 perovskite ceramics were investigated. Impedance spectroscopy analysis confirms that this material is electrically heterogeneous which plays a major role for the high dielectric constant. The sintering temperatures have a sensitive influence on the values of the dielectric constant. High dielectric constant (12,708) with low dielectric loss (0.23) was achieved at room temperature for 1250 degrees C sintered ceramic. Activation energy was found to be 0.25 eV and 0.31 eV corresponding to grain and grain boundary, respectively which confirms that the grain boundaries are more insulating than grains. We observed the high magnetocapacitance ( 5.8%) at 9 kOe for 1250 degrees C sintered sample which is useful for the practical application. This study will help to modify the BaFe0.5Nb0.5O3 based materials and lead to more applications in the microelectronics devices. (C) 2017 Elsevier Ltd. All rights reserved.