Dielectric properties of BaTi4O9(f)/0.64BaTi4O9-0.36 BaPr2Ti4O12 compostie ceramics

BaTi4O9 (f)/(0.64 BaTi4O9-0.36 BaPr2Ti4O12) composite ceramics were prepared to meet the need for a new kind of microwave dielectric ceramics with modifiable dielectric constant, low dielectric loss and small temperature dependence. The phase composition, dielectric properties, the chemical state of Ti element and abundance of the constituent elements on the sample surface were characterized by X-ray diffraction (XRD), LCR meter method and X-ray photoelectron spectroscopy (XPS). The results show that this system is composed of only two phases, BaTi4O9 and BaPr2Ti4O12. The contents of Ti3+ and Ti2+ decrease and O element increases in the BPT system composite ceramics due to the addition of BaTi4O9 fibers, which makes the dielectric properties of the system improve greatly. BPT10 sample, which has 10% BaTi4O9 fibers, has the best dielectric properties in this system, with Εr=64, tgδ=1&middot10-4 (at 1 MHz), which might be a potential material for microwave dielectric ceramics.