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 εr and piezoelectric strain constant d33 of BaTiO3/PVDF composites reached the maximum values which were 168.86 and 28pC/N, respectively, and dielectric loss tanδ maintained around 0.02.