Microstructure and dielectric properties of BaTi_4 O_9 (f)/0.64 BaTi_4 O_9 + 0.36 BaPr_2 Ti_4 O_(12) composites

摘要

The microstructure, dielectric properties and chemical state of Ti element on BaTi_4 O_9 (f)/(0.64 BaTi_4 O_9-0.36BaPr_2Ti_4O_(12)) composites sample surface were characterized by X-ray diffraction (XRD) Transmission electron microscopy (TEM), LCR meter method and X-ray photoelectron spectroscopy (XPS). The results show that the system is composed of BaTi_4O_9 and BaPr_2Ti_4O_(12) two phases. Pr ions are distributed in the BaTi_4 O_9 grains and the segregation of Pr ions was observed on the grain boundaries of BaTi_4O_9/BaTi_4O_9. The content of Ti~(3+) and Ti~(2+) decrease in the BPT system composites due to the addition of BaTi_4O_9 fibers, which improved the dielectric properties of the system. BPT10 sample with 10 percent BaTi_4O_9 fibers, has the best dielectric properties in the system, its epsilon _r =64, tan delta = 1 X 10~(-4) (at 1 MHz), and it may be a potential candidate for microwave dielectric ceramics.