Influence of calcination temperature on structural, optical, dielectric properties of nano zirconium oxide

Zirconium Oxide (zirconia) nanoparticles have been prepared through hydrothermal method at different calcinatation temperatures. The structural properties of zirconia powders were characterized by X-ray diffraction (XRD) technique. The sample prepared at 400 °C shown the mixed phase with co-existence of cubic and monoclinic phases and the samples prepared at 600 °C, 800 °C and 1100 °C shown the monoclinic phase. Further, surface morphology and particle size of the sample calcined at 400 °C was confirmed by transmission electron microscopy (TEM). The band gap is estimated from UV–vis spectra of zirconia particles .The frequency dependence of dielectric constant and loss were investigated at room temperature. Result showed, dielectric constant decreases with frequency.