Effect of Yb_2O_3 content on dielectric and energy-storage properties of lead-free niobate glass-ceramics

摘要

(100-x) (14.4SrO-17.6BaO-32Nb(2)O(5)-36B(2)O(3))-xYb(2)O(3) (x=0, 0.5, 1.0, 1.5, and 2.0%) glass-ceramic composites were synthesized through melt-quenching followed by controlled crystallization techniques. The effects of the Yb2O3 addition on the microstructure, phase evolution, and dielectric properties were investigated. The results show that the addition of Yb2O3 to the glass-ceramics could change their dielectric properties and energy-storage densities. The optimal dielectric constant of 98.3 and maximum breakdown dielectric strength of 1398kV/cm were obtained for the glass-ceramic with 1.0% Yb2O3 heated at 850 degrees C for 3h. The optimized composition exhibited a high energy-storage density of 8.5J/cm(3), making it a promising candidate for high-energy-density capacitors.