Dielectrical Properties of CeO(2) Nanoparticles at Different Temperatures

A template-free precipitation method was used as a simple and low cost method for preparation of CeO(2) nanoparticles. The structure and morphology of the prepared nanoparticle samples were studied in detail using X-ray diffraction, Raman spectroscopy and Scanning Electron Microscopy (SEM) measurements. The whole powder pattern modelling (WPPM) method was applied on XRD data to accurately measure the crystalline domain size and their size distribution. The average crystalline domain diameter was found to be 5.2 nm, with a very narrow size distribution. UV-visible absorbance spectrum was used to calculate the optical energy band gap of the prepared CeO(2) nanoparticles. The FT-IR spectrum of prepared CeO(2) nanoparticles showed absorption bands at 400 cm(-1) to 450 cm(-1) regime, which correspond to CeO(2) stretching vibration. The dielectric constant (ε(r)) and dielectric loss (tan δ) values of sintered CeO(2) compact consolidated from prepared nanoparticles were measured at different temperatures in the range from 298 K (room temperature) to 623 K, and at different frequencies from 1 kHz to 1 MHz.