Influence of Dy2O3 doping amount on barium strontium carcium titanate thick films by screen-printing method

Abstract

(Ba0.57Sr0.33Ca0.10) TiO3 (BSCT) powders were prepared by a sol-gel method. The BSCT thick films were fabricated by a screen-printing techniques on alumina substrates and then sintered at 1420 degrees C for 2 h. We also investigated the structural and dielectric properties of BSCT thick films as a function of a variation of Dy2O3 content. The results of X-ray diffraction analysis showed a cubic perovskite structure without presence of the second phase in all BSCT thick films. A BSCT thick film doped with 0.1 mol% Dy2O3 showed a relatively dense microstructure with an average grain size of 1.26 mu m. The thickness of all the BSCT thick films was approximately 60 mu m. The Curie temperature of the 0.1 mol% Dy2O3 doped BSCT specimens was 0 degrees C, and the dielectric constant and dielectric loss at this temperature were 6650 and 3.5%, respectively.