Preparation and Electrical Properties of Mn-Doped Ba1-xSrxTiO3 Ceramic Powder

Abstract

Mn-doped Ba_1-xSr_xTiO₃ (BST) ceramic powder had been successfully prepared by sol-gel process. The formation process of Ba_0.4Sr_0.5Mn_0.1TiO₃ (BSMT) was tested through thermal analysis (TG-DTA) and X-ray diffraction. The electrical properties and microstructure of Mn-doped BST showed that manganese, which was doped at the A-site of ABO₃ perovskite materials, could not affect the perovskite phase structure, but could influence the resistance voltage characteristics in low frequency and the resistance value was lowered from 10381-1076 kW, about 10 times decline. The relationship between resistance and temperature exhibited that in middle frequency, the sample displayed double peak effect and the electrical characteristics related to ferroelectricity of grains and shifted from high temperature to low temperature with an increasing frequency. But in low frequency, it revealed the characteristics of resistance and capacitance of grains. These phenomena could be interpreted by Heywang model theory.