Jingwen Lv,Simeng Song,Yan Jiao,Zhaoyu Yang,Yilin Zhang,Yingjie Fan,Chunlin Song,Gang Liu
A novel strategy of enhancing the dielectric and energy storage properties of Na 0.5 Bi 0.5 TiO 3 –BaTiO 3 (NBT–BT) ceramics by introducing a K 0.5 Na 0.5 NbO 3 (KNN) ferroelectric phase is proposed herein, and its underlying mechanism is elucidated. The lead-free KNN ceramic decreases the residual polarisation and increases the electric breakdown strength of the NBT–BT matrix through the simultaneous modification of its A-sites and B-sites. The obtained NBT−BT− x −KNN ceramics have a perovskite structure with unifying grains. A bulk 0.9NBT–BT–0.1KNN ceramic sample with a thickness of 0.2 mm possesses a high energy storage density of 2.81 J/cm 3 at an applied electric field of 180 kV/cm. Moreover, it exhibits good insulation properties and undergoes rapid charge and discharge processes. Therefore, the obtained 0.9NBT–BT–0.1KNN ceramic can be potentially used in high-power applications because of its high energy density , good insulation properties, and large discharge rate.
Gang Liu,Ziyang Wang,Leiyang Zhang,Wenjing Shi,Jiayi Jing,Yi Chen,Hongbo Liu,Yan Yan
MgO doped NBT-BT ceramics were prepared by the conventional electroceramic processing. The effects of MgO on the phase, microstructures and electrical properties of NBT-BT ceramics were systematically investigated. When doping content is more than 1%, a second phase appeared, which has great effect on dielectric, ferroelectric, and piezoelectric properties, such as the TF-R peak weakened, moved to the higher temperature, and eventually disappeared. When the doping content is above 1.5%, the ceramic samples show a strong relaxation. The detailed analysis and discussion can be found within this study.
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