Optimized microstructure and energy-storage density of Sm_2O_3-added lead-free borate glass-ceramic composites

摘要

Lead-free borate glass-ceramic composites added with Sm_2O_3 were synthesized through melt-quenching followed by controlled crystallization techniques. The structural and dielectric properties were characterized. The addition of 0.5 mol% Sm_2O_3 to the glass ceramics changed the dielectric permittivity and breakdown strength remarkably. The maximum theoretical energy density of 8.15 J/cm~3 was achieved in the glass-ceramic with 0.5 mol% Sm_2O_3, which was improved by 2.6 times as compared with that of the pure glass-ceramic, suggesting dielectric glass-ceramic composite of this composition could be the most attractive candidate for high energy density capacitors.