Abstract
The BaO-Na2O-Bi2O3-Nb2O5-Al2O3-SiO2 (BNBN-AS) glass-ceramics were prepared by technics of melt-quenching accompanied with process of controlled crystallization. According to the X-ray diffraction results, NaNbO3 with perovskite structure and Ba2NaNb5O15 with tungsten bronze structure were all precipitated at four different crystalline temperatures. With the increasing of crystalline temperature, the relative dielectric constant kept increasing, while breakdown strength (BDS) increased first and then decreased. The highest relative dielectric constant of 123 at 1000 °C as well as optimal breakdown strength of 1878.75 ± 63.2 kV/cm at 950 °C were acquired in this system. The theoretical energy-storage density was markedly enhanced up to the maximum value of 18.4 ± 1.3 J/cm3 at 950 °C, which is approximately twice than that at 850 °C. The discharged energy density reached to 0.48 J/cm3 at the applied electric field of 600 kV/cm for the sample crystallized at 950 °C, which promises a broad application prospect.
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