Effect of Sodium Oxide Content on Structure,Ferroelectric Characteristics and Energy Storage Performances of Boro-niobate System Glass-ceramics
(33.5+x)Na2O-33.5Nb2O5-33B2O3(Abbreviated as NN,x=0,2,4,6)glass-ceramics were fabricated using the conventional high-temperature melting technique followed by a controlled crystallization process.The impact of varying x values on the phase composition,microstructure,ferroelectric characteristics,and energy storage capabilities of boro-niobate glass-ceramics was comprehensively investigated.The findings reveal that the predominant crystal phase of all boro-niobate glass-ceramic samples is NaNbO3 with perovskite structure.When x is less than 4,the second phase Na2Nb4O11 appears concomitantly in the glass-ceramics.With the increase of x value,the structure of NaNbO3 antiferroelectric P phase changes to ferroelectric Q phase.All boro-niobate glass-ceramics exhibit obvious ferroelectric characteristics.When x=4,the dielectric constant of the glass-ceramic sample reaches 153,and a higher breakdown strength of 1205.81 kV·cm-1 is obtained,and the recoverable energy storage density(Wrec)of 0.81 J·cm-3 when 800 kV·cm-1 field strength was applied,the instantaneous discharge power density(Wd)at 600 kV·cm-1field strength is 145.87 MW·cm-3.The boro-niobate system glass ceramics are expected to be used in pulse power systems.
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