Dependence of optical band gap and crystal structure of nanoelectroceramic PMN-PT on zirconia

In this study, nanoelectroceramic (۱-x)Pb(Mg۱/۳,Nb۲/۳)O۳-xPb(Zr۰.۵۲,Ti۰.۴۸)O۳ for x=۰.۳۵ was prepared by sol-gel combustion method. The effect of calcination temperature on the structure and properties of PMN-PT:Zr nanopowders was investigated. The optical band gap of the samples was obtained using the absorption spectrum diagram. Investigations showed that at the calcination temperature of ۸۵۰ oC, the samples prepared by this method have a single-phase perovskite crystal structure. Examining the SEM images prepared from the tablets at different annealing temperatures shows that increasing the temperature causes the growth of grains and the reduction of porosity. The results show that the best annealing temperature of PMN-PT:Zr ceramic is ۱۲۵۰ oC. By adding zirconium impurity, it is expected that a noticeable change in the optical properties of PMN-PT will be achieved.