Department of Applied Chemistry;
Harbin Institute of Technology;
Harbin 150001;
China;
Department of Electronics Science and Technology;
Harbin Institute of Technology;
Harbin 150001;
China;
Department of Applied Chemistry;
Harbin Institute of Technology;
Harbin 150001;
China;
Department of Applied Chemistry;
Harbin Institute of Technology;
Harbin 150001;
Chinahe microstructure;
dielectric properties and chemical state of Ti element on BaTi_4O_9 (f)/(0.64 BaTi_4O_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 BaWi_4O_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% BaTi_4O_9 fibers;
has the best dielectric properties in the system;
its ε_r = 64;
tan δ= 1×10~(-4)(at 1 MHz);
and it may be a potential candidate for microwave dielectric ceramics.;
微观结构; 介电性能; 化学状态; 钛酸钡; 钛酸镨钡; 钛元素; 微波介电材料;
