INFLUENCE OF THE CALCINATION TEMPERATURE ON THE STRUCTURE AND OPTICAL PROPERTIES OF K0.5Na0.5NbO3 NANOPOWDERS SYNTHESIZED BY SOL-GEL TECHNIQUE

Abstract

K_0,5Na_0,5NbO₃ (KNN) nano powder materials were fabricated by sol-gel method. The effect of the sintering temperatures on the structure and optical properties was also studied. The results of X ray diffraction indicated that KNN samples have the perovskite structure with an orthorhombic phase. Raman spectroscopy exhibited that there was a change in the scattering vibration modes at the different calcination temperatures. By increasing these temperatures, the optical band gap of the samples calculated in UV-vis absorption spectroscopy declined. Our work showed that KNN samples synthesized by sol-gel method has lowered the sintering temperature compared with some reported fabrication techniques.