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The 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.
The 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 were characterized by X-ray diffraction (XRD), Transmission electron microscopy 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.