Dielectric properties and AC conductivity of green synthesized nano La2O3/La(OH)3

In this study nano lanthanum oxide (La2O3) was synthesized by starch template method. The physicochemical characterization of La2O3 was carried out by versatile techniques like TGA-DTG/DSC, XRD and FT-IR. The XRD analysis confirms the pure phase and hexagonal structure of La2O3. Thermal analysis of La2O3 precursors proved to be useful to understand the mechanism of thermal degradation behaviour during the formation of La2O3. The synthesized La2O3 was chemically unstable in ambient air due to its hygroscopic nature and a complete transformation into hexagonal lanthanum hydroxide (La(OH)3) was detected. Investigations of dielectric parameters viz. capacitance, dielectric constant, dielectric loss and ac conductivity measurements of La2O3 and La(OH)3 were done using impedance spectroscopy. La(OH)3 found to have high capacitance, high dielectric constant and high ac conductivity with almost same dissipation factor compared to La2O3.