Effect of Mn doping on the dielectric properties of BaTi0.9Sn0.1O3 ceramics

Abstract

Pure and Mn-doped BaTi0.9Sn0.1O3 ceramics are prepared via the conventional solid state reaction method. The microstructures, dielectric properties, and diffuse transition of BaTi0.9Sn0.1O3 ceramics with 0, 0.2, 1 and 2 at.% Mn have been investigated. The results indicate that manganese ions enter the unit cell maintaining the perovskite structure of solid solution. Grain size of BaTi0.9Sn0.1O3 ceramics sharply decreases after doping MnO2. However, once MnO2 content is more than 0.2 at.%, the average grain size of Mn-doped BaTi0.9Sn0.1O3 ceramics increases with the increasing of MnO2 content. The addition of manganese leads to the increase of the Curie temperature. The diffuseness of the phase transition of Mn-doped BTS ceramics decreases with the increase of Mn content, which may be due to grain size effect.