Author(s)

Sanchita Dewanjee, Rajib Chandra Das, Muhammed Yusuf Miah

Department of Applied Chemistry and Chemical Engineering, Noakhali Science and Technology University, Noakhali, Bangladesh.

In order to explore new application opportunities of Barium Strontium Titanate (BST) ceramic composite by modifying the conventional ferroelectric properties of BST through La₂O₃ doping in BST matrix sintered at different temperature was investigated in this current study. Unadulterated Ba_0.3Sr_0.7TiO₃ (BST) matrix was prepared from BaTiO₃ (99.95%) and SrTiO₃ (99.95%) taken in stoichiometric extents which later doped by La₂O₃ (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 La₂O₃ doped BST) sintered at 1460°C and reverse is found in impedance analysis. These electrical properties showed visible frequency dependent response irrespective of sintering temperature and doping.

Barium Strontium Titanate, Lanthanum Oxide, Ceramics, Dielectric Constant, Conductivity, Impedance

Dewanjee, S. , Das, R. and Miah, M. (2020) Preparation and Characterization of La₂O₃ Doped Ba_0.3Sr_0.7TiO₃ Perovskite Ceramics of Varied Sintering Temperature and Doping. Advances in Materials Physics and Chemistry, 10, 253-262. doi: 10.4236/ampc.2020.1011019.