The study of FeTiNbO6/PVDF composite with High Dielectric Permittivity

• 1、College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

Abstract：FeTiNbO6 (denoted as FTN) is a new polar material with high dielectric constant and high Curie temperature. In this work, the well dispersive FTN particles with mean size of 500nm have been synthesized firstly through the solid-state reaction method. Then, using FTN particles as fillers and poly(vinylidene fluoride, denoted as PVDF) polymer as matrix, the FTN/PVDF composites with a broad filling rang of the FTN volume ratio (0~60 %) have been prepared by hot-pressing method. At the same filling content, FTN/PVDF composite shows a higher dielectric constant comparing with the BaTiO3/PVDF composite. Through the theoretical analysis, it is deduced that the high dielectric constant origins from the three main points, such as giant dielectric FTN filler, the micro capactor structure and percolation phenomenon. Meanwhile, the ferroelectric properties of composites have also been investigated. It is believed that the FTN/PVDF composites show potential application in new generational embedded capacitors.

Keywords： FeTiNbO6 composite material embedded capacitors；PVDF