Grain size effect on electric properties of novel BaTiO₃/PVDF composite piezoelectric ceramics

Researches on barium titanate ceramics have been prosperous since its lead-free feature. In this paper, we classified the BaTiO₃ ceramics into four different groups to study the effect of grain size on the electrical properties. According to the analysis of element, size distribution, conductivity, piezoelectric, and dielectric properties, we found that group #3, compounded distribution where the majority is small size, exhibited the best performance among four groups. The dielectric constant ε _r and piezoelectric strain constant d ₃₃ of BaTiO₃/PVDF composites reached the maximum values which were 168.86 and 28pC/N, respectively, and dielectric loss tanδ maintained around 0.02. (paper)