Temperature dependence of domain structure in (K_0.17Na _0.83)NbO₃ lead free piezoelectric single crystal grown by bridgman method

Lead free piezoelectric single crystals of (K_0.17Na _0.83)NbO₃ have been successfully grown by the solution Bridgman method. The chemical composition of the obtained single crystal was determined by electron probe microanalysis (EPMA), showing that the K/Na ration is derivate from the theoretical ratio. The crystal was examined also by X-ray diffraction and dielectric measurements. The optical study of (K _0.17Na_0.83)NbO₃ single crystal shown three phase transition at 223°C, 412°C and 472°C in heating and at 198°C, 408°C and 478°C during cooling, while dielectric measurements performed on (K_0.17Na_0.83)NbO₃ single crystal exhibited phase transitions at 206°C and 424°C, respectively.