Abstract
Full density Nb2O5-BaO-Na2O-SiO2 Glass-ceramics, which could be used as the dielectric energy-storage materials to fabricate high energy density devices, were prepared by means of rapid quenching and succeeding annealing under different temperature. DTA and X-ray diffraction analysis showed that NaBa2Nb5O15 with tungsten bronze structure and NaNbO3 with perovskite structure were formed as the dielectric phases from the glass matrix at above 750°C. Dielectric constant of the crystallized glass-ceramics were measured at the frequency from 100 Hz to 100 kHz under the testing temperature from -40 to 150°C. The results indicated that theoretical energy storage density of the material crystallized at 800°C could reach up to 1.87x106J/m3, which would be suitable to be used as the innoxious dielectric media for high-energy storage capacitors.
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