In order to explore new application opportunities of Barium Strontium Titanate (BST) ceramic composite by modifying the conventional ferroelectric properties of BST through La<sub>2</sub>O<sub>3</...In order to explore new application opportunities of Barium Strontium Titanate (BST) ceramic composite by modifying the conventional ferroelectric properties of BST through La<sub>2</sub>O<sub>3</sub> doping in BST matrix sintered at different temperature was investigated in this current study. Unadulterated Ba<sub>0.3</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> (BST) matrix was prepared from BaTiO<sub>3</sub> (99.95%) and SrTiO<sub>3</sub> (99.95%) taken in stoichiometric extents which later doped by La<sub>2</sub>O<sub>3</sub> (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<sub>2</sub>O<sub>3</sub> doped BST) sintered at 1460<span style="white-space:nowrap;">°</span>C and reverse is found in impedance analysis. These electrical properties showed visible frequency dependent response irrespective of sintering temperature and doping.展开更多
文摘In order to explore new application opportunities of Barium Strontium Titanate (BST) ceramic composite by modifying the conventional ferroelectric properties of BST through La<sub>2</sub>O<sub>3</sub> doping in BST matrix sintered at different temperature was investigated in this current study. Unadulterated Ba<sub>0.3</sub>Sr<sub>0.7</sub>TiO<sub>3</sub> (BST) matrix was prepared from BaTiO<sub>3</sub> (99.95%) and SrTiO<sub>3</sub> (99.95%) taken in stoichiometric extents which later doped by La<sub>2</sub>O<sub>3</sub> (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<sub>2</sub>O<sub>3</sub> doped BST) sintered at 1460<span style="white-space:nowrap;">°</span>C and reverse is found in impedance analysis. These electrical properties showed visible frequency dependent response irrespective of sintering temperature and doping.
