Synthesis, characterization and dielectric properties of TiO2-CeO2 ceramic nanocomposites at low titania concentration

摘要

TiO2(x)-CeO2(1-x) nanocomposites were prepared at low TiO2 composition of 5, 10, 15 and 20%, by using TiO2 and CeO2 nanoparticles obtained by polymeric citrate precursor method. These nanocomposites were characterized by using powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy dispersive analysis of X-rays and BET surface area studies. BET studies showed the specific surface area of as-prepared nanocomposites in the range of 239-288m(2) g(-1). Twenty percent of TiO2-based titania-ceria nanocomposites have smallest average particle size of 30 nm and highest surface area of 288 m(2) g(-1) among all the as-prepared nanocomposites. The dielectric characteristics were measured as a function of frequency and temperature. The dielectric constant of TiO2(x)-CeO2(1-x) at room temperature was 35.6 (maximum) at 500 kHz for x = 0.20.