Abstract
Compared with ferroelectric ceramics, antiferroelectric ceramics, ferroelectric thin film and polymer-based composites, ferroelectric glass-ceramics have the advantages of high energy storage density, fast discharge speed and high power density. The effects of phase structures on dielectric properties, electric breakdown strength, energy-storage and charge-discharge performances have been systematically investigated in Na2O-BaO-PbO-Nb2O5-SiO2-Al2O3 glass-ceramics. The content of SiO2 and Nb2O5 affected the dielectric energy storage performances of the glass-ceramics by changing their ferroelectric phase proportions and crystallinity. By XRD analysis and Rietveld refinements, it was found the dielectric constant of the glass-ceramics was positively correlated with the relative proportions of M2NaNb5O15 (M = Ba or Pb) and NaNbO3 phases. The electric breakdown strength was negatively correlated with crystallinity and grain boundary activation energy. The maximum energy storage density 17.9 J cm−3 was obtained in these glass-ceramics. When the content of Nb2O5 was 30 mol%, under the charge electric field 300 kV cm−1 in overdamped discharge circuit, the instantaneous power density of glass-ceramics capacitors reached 75 MW cm−3. The discharge time for all glass-ceramics capacitors was less than 50 ns.
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