Estudo das propriedades elétricas e dielétricas do CABI4TI4O15 com adições de V2O5

Abstract

The ceramic CaBi4Ti4O15 (CBT) is a ferroelectric layer structure Aurivillius bismuth family, the space group A21am. This ceramics was prepared by the method of solid state reaction. This ceramic material has a deficiency A5B4O15 cation. The reactants were milled for 6h in a planetary ball mill, high energy and calcined at 800 ° C for 2 hours in an oven resistive. After determining the phase CBT was added vanadium pentoxide (V2O5) in proportions of 5% to 10% by weight. The x-ray diffraction showed the formation of single orthorhombic phase of CBT. Regarding the dielectric properties (dielectric constant and dielectric loss) were measured at 30 ° C to 400 ° C, whereby it is noted the presence of thermally activated processes. For measurements in the frequency range of microwaves this material showed a satisfactory resonance. With this we can see that the CBT has properties veryrelevant that indicate their use as dielectric resonator antennas, oscillators, filters and capacitors.