Effect of lanthanum doping on electrical and electromechanical properties of Ba1−x La x TiO3

The effect of lanthanum doping is studied on ferroelectric properties of Ba1- x La xTiO3 withx = 0.0005, 0.001, 0.003 prepared through solid state sintering route. Dielectric and impedance spectroscopic studies have been carried out. The tetragonal distortion of the unit cell decreased and ferroelectric transition temperature,T cincreased with the increase of lanthanum content. Combined impedance and admittance spectroscopy was used to analyse impedance data. The electromechanical parameters were calculated from the resonant and anti-resonant frequencies from vector admittance plots. The electromechanical coefficients for Ba1−xLaxTiO3 withx = 0.003 were found to be much larger than that of pure barium titanate.