Articles
  • Influence of Dy2O3 doping amount on barium strontium carcium titanate thick films by screen-printing method
  • Hyun-Ji Noha, Sung-Gap Leea,*, Kyu-Hong Hwanga, Sung-Gurl Chob, Jae-Kyong Chob and Young-Hie Leec
  • aDept. of Ceramic Engineering, Eng. Res. Insti., Gyeongsang National University, Gyeongnam, 660-701, Korea b Dept. of Electronic Materials Eng. Gyeongsang National University, Gyeongnam, 660-701, Korea c Dept. of Electric Materials Engineering, Kwangwoon University, Seoul 139-701, Korea
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 oC 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 μm. The thickness of all the BSCT thick films was approximately 60 μm. The Curie temperature of the 0.1 mol% Dy2O3 doped BSCT specimens was 0 oC, and the dielectric constant and dielectric loss at this temperature were 6650 and 3.5%, respectively.

Keywords: sol-gel, Screen-printing, Thick films, Ferroelectric, Dielectric constant.

This Article

  • 2009; 10(4): 577-580

    Published on Aug 31, 2009