Abstract
The barium sodium niobate (BNN) glass-ceramics with different amount of CaF2 addition were fabricated by melting-crystallization method. Effects of CaF2 on microstructure, phase compositions, interface polarization, dielectric, energy-storage and charge–discharge properties of the BNN-glass-ceramics were comprehensively studied. Results indicate a suitable amount of CaF2 (from 1.0 to 3.0 mol%) is helpful to improve both relative permittivity and breakdown strength (BDS) of the BNN-glass-ceramics. The theoretical energy-storage density is up to 14.3 J/cm3 when the amount of CaF2 reaches 3.0 mol%. The optimal composition of 3.0 mol% CaF2 addition was further evaluated by a pulsed charged–discharged circuit and P–E hysteresis loops, from which we can conclude BNN-glass-ceramic is an excellent linear dielectric material. And the stored energy could be released within 50 ns and discharge power density reaches 75.6 MW/cm3. It’s for such results that the glass-ceremics with CaF2 addition are promising materials for pulse power applications.
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