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Ferroelectric glass-ceramics are promising composite materials with dualproperties, of high dielectric permittivity and high dielectric breakdownstrength. In this context, new phosphate glass-ceramics 2BaO-0.5Na2O2.5[(1-x)Nb2O5 xWO3]-1P2O5 (x=0, 0.1, 0.2, 0.3 and 0.4) designated as B0, B1,B2, B3, B4 respectively, were prepared by the controlled crystallizationtechnology and then crystallized at high temperature of 760 {\deg}C for 10hours. Subsequently, the obtained glass-ceramics were studied by DifferentialScanning Calorimetry (DSC), X-ray powder diffraction (XRD), Raman, impedancespectroscopy, and the P-E hysteresis loops. All of these techniques allowed theidentification of Ba2Na4W2Nb8O30 phase with tungsten bronze structure embeddedin the glassy matrix. The density of glass-ceramics was found to increase withincreasing tungsten content to reach a maximum at x =0.3 and then decreases.Dielectric and conductivity parameters were found to be governed by thepresence of oxygen vacancies. Room temperature energy storage property whichdepends on the composition X, was performed using P-E hysteresis loops of theglass-ceramics. The optimum discharge density was obtained for B3 with anenergy efficiency of 73.77%.

Structural, electrical and energy storage properties of BaO Na2O Nb2O5 WO3 P2O5 glass ceramics system