Abstract
ABSTRACT: Na2O–K2O–Nb2O5–SiO2–BaO initial glass were synthesized by traditional melts method and treated to fabricate glass-ceramics by controllable crystallization. The effect of glass network structure was studied on interfacial polarization, energy storage density and charge-discharge performances. NaNbO3 was precipitated as major phase and maintained similar degree of crystallinity for all samples. A high degree of polymerization (DOP) glass network structure was obtained because of the addition of BaO. Charge localization caused by interfacial polarization weakened because carriers were trapped uniformly in glass network structure, so breakdown strength (BDS) reached to 590 kV/cm when x = 5 because of the low value of Ea of 0.98eV. When x = 3, the maximum value of discharge energy density and the power density reached to 0.21J/cm3 and 16MW/cc respectively at 240 kV/cm by LCR circuit.
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