The effect of silica addition on dielectric properties of barium titanate nanoparticles

Abstract

The effect of silicon dioxide (SiO2) nanoparticles on the dielectric constant was studied. Different weight percentages of silica (3, 5, and 7 %) were added to BaTiO3 nanoparticles. The structure, morphology, and dielectric properties were obtained using X-ray diffraction (XRD) and scanning electron microscopy (SEM), and an LCR meter. The diffraction patterns were shown that the crystallite size of BaTiO3 increased with the addition of SiO2. The dielectric constant and the dielectric loss were measured with various temperatures ranging from 27 to 180 °C at a constant frequency of 10 kHz. It was found that the value of the dielectric constant for the pure BaTiO3 is the highest at the Curie temperature (128 °C). The Curie temperature shifted to a higher value and the dielectric constant was decreased when the silica was added to BaTiO3. Moreover, with increasing the silica percentage, the variation in the dielectric loss values with the temperature was observed.