Preparation and Characterization of La_2O_3 Doped Ba_(0.3)Sr_(0.7)TiO_3 Perovskite Ceramics of Varied Sintering Temperature and Doping

摘要

In order to explore new application opportunities of Barium Strontium Titanate (BST) ceramic composite by modifying the conventional ferroelectric properties of BST through La_2O_3 doping in BST matrix sintered at different temperature was investigated in this current study. Unadulterated Ba_(0.3)Sr_(0.7)TiO_3 (BST) matrix was prepared from BaTiO_3 (99.95%) and SrTiO3 (99.95%) taken in stoichiometric extents which later doped by La_2O_3 (99.99%) in varying extents (0.05 g, 0.10 g and 0.15 g) exploiting solid state reaction route. Doping caused drag effect for the penetration of impurities and sintering temperature helped the impurities migration to BST. Dielectric constant gets lower with rising of frequency, as electrons do not get enough time to polarize at high frequency. Dielectric constant and conductance are found maximum for the sample (0.1 g La_2O_3 doped BST) sintered at 1460 and reverse is found in impedance analysis. These electrical properties showed visible frequency dependent response irrespective of sintering temperature and doping.