Dielectric and Ferroelectric Properties of (1-x)BaTiO₃ – xBiScO₃ Solid Solution

Abstract

Ceramics of (1-x)BaTiO ₃ −xBiScO ₃ solid solution with compositions x = 0, 0.01, 0.03, 0.05 and 0.10 were synthesized in pure perovskite phase by a solid state reaction. The dielectric and ferroelectric properties were investigated. The temperature dependence of the dielectric permittivity shows that the ferroelectric T _C increases with the increasing amount of BiScO ₃ substitution, which was confirmed by differential scanning calorimetry (DSC). While three dielectric anomalies associated with the three structural phase transitions were clearly observed in pure BaTiO ₃ , the two anomalies at lower temperatures were impaired by the substitutions of BiScO ₃ for BaTiO ₃ . The DSC measurements reveal that the two peaks associated with the lower temperature phase transitions disappear after the BiScO ₃ substitution. These results demonstrate the significant effects of BiScO ₃ on the structural phase transitions and dielectric and ferroelectric properties of the (1-x)BaTiO ₃ −xBiScO ₃ solid solution.

Keywords:

• BaTiO₃–BiScO₃ solid solution
• chemical disorder
• dielectric properties
• ferroelectricity