Improvement of Dielectric Breakdown Strength in (1 -x)Sr_(0.7)Ba_(0.3)Nb_2O_6-xSr_(0.7)Bi_(0.2)TiO_3 Ceramics

摘要

In this work, a series of (1-x)Sr_(0.7)Ba_(0.3)Nb_2O_6-xSr_(0.7)Bi_(0.2)TiO_3 ceramics were formulated by a phase-mixed sintering, the microstructure and energy storage performance were studied. The introduction of SBT induces the formation of equiaxed crystals leading to the denser microstructure, thus improving the dielectric breakdown strength. In addition, the enhancement of relaxor behavior improves the energy storage performance. For 0.94Sr_(0.7_Ba_(0.3)Nb_2O_6-0.06Sr_(0.7)Bi_(0.2)TiO_3, an energy storage density of 0.49J/cm~3 and an efficiency of 94.2% were achieved.