Dielectric properties of BaTiO3 based materials with addition of transition metal ions with variable valence

Abstract

Dielectric properties of BaTiO3 (BT), BaTiO3+0.1wt. %MnO2 (BTMn) and BaTiO3+0.1 wt.%Fe2O 3 (BTFe) solid solution was investigated. The effects of substitution on the microstructure and on the electric properties of BaTiO3 samples were studied by performing X-ray diffraction and electric measurements. X-ray diffraction analysis of the samples shows the formation of single-phase compound with a tetragonal structure at room temperature. SEM microphotographs exhibit the uniform distribution of grains. The electric properties (a real part of electrical permittivity(') and an imaginary part of electric modulus (M")) were investigated in the temperature range from 150K to 600K and in the frequency range from 0.1 Hz to 10 MHz. It was found that a Fe and Mn ions -doping influence the electric properties of the investigated polycrystalline materials. © Published under licence by IOP Publishing Ltd.