AC Conductivity and Dielectric Properties of BiScO3-PbTiO3 Piezoelectric Ceramics

Bi-based BiMeO3 (where Me is a transition metal) has been extensively studied owing to its outstanding ferroelectric properties. The dielectric and electrical properties of piezoelectric ceramics can be enhanced by the addition of Bi-based materials such as BiAlO3, BiScO3, and Bi(Mg, Ti)O-3. Among them, BiScO3-PbTiO3 ceramics have shown excellent piezoelectric properties and temperature stability near the morphotropic phase boundary (MPB) region. Meanwhile, it is important to study the electrical properties of piezoelectric materials such as dielectric permittivity, conductivity of ferroelectric compounds, since dielectric and conductivities are related to pyroelectricity and piezoelectricity. In this study, the AC conductivity and dielectric properties of BiScO3-PbTiO3 ceramics were investigated with a wide range of frequencies and temperatures. Especially, the effect of PbTiO3 content on dielectric behavior of the BiScO3-PbTiO3 system was intensively studied by impedance spectroscopy.