Microstructure and dielectric properties of BaTi4O9 (f)/(0.64 BaTi4O9+0.36 BaPr2Ti4O12) composites

The microstructure, dielectric properties and chemical state of Ti element on BaTi4O9 (f)/(0.64BaTi4O9+0.36 BaPr2Ti4O12) 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 BaTi4O9 and BaPr2Ti4O12 phases. Pr ions are distributed in the BaTi4O9 grains and the segregation of Pr ions was observed on the grain boundaries of BaTi4O9/BaTi4O9. The content of Ti3+ and Ti2+ decrease in the BPT system composites due to the addition of BaTi4O9 fibers, which improve the dielectric properties of the system. BPT10 sample with 10% BaTi4O9 fibers has the best dielectric properties in the system, and it may be a potential candidate for microwave dielectric ceramics.