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A series of (1-x)[(2BaO-0,5Na2O)-1P2O5] -xNb2O5 (BNPN, x=0,41, 0,43, 0,45,0,48) glass-ceramics based on phosphate glasses have been prepared via acontrolled-crystallization route. The structure, dielectric properties,interfacial polarization, and energy storage properties were systematicallyinvestigated. The x-ray diffraction results showed the simultaneous presence ofBa2NaNb5O15 tungsten bronze structure (TTB) and the NaNbO3 perovskite. A stabledielectric constant over a temperature range from 25-200{\deg}C, low dielectriclosses less than 0,03, and excellent frequency stability at room temperaturewere obtained. The decrease in niobium content promoted TTB crystallizationwith the improvement of the high dielectric properties of the system. Theoptimum of the dielectric constant and recoverable energy storage density wereobtained for BNP41 crystallized at 1000{\deg}C. Analyses of the compleximpedance indicated that the niobium content and crystallization temperatureaffect the interfacial polarization.

Structural, dielectric and energy storage properties of BaO-Na2O-Nb2O5-P2O5 glass-ceramic