(073005)Energy Storage Performance of KNN-Based Dielectric Ceramic through the Component Design

摘要

In this work, (1-x)K_(0.5)Na_(0.5)NbO_3-xBiMg_(0.5)Sn_(0.5)O_3 (1-x)KNN-xBMS ceramics were prepared by the conventional solidreaction method and the microstructure and electrical properties were investigated. The results suggest that the BMS accounts for the R(Rhombohedral)-C(Cubic) relaxor phase transition due to an out-plane deformation as well as nearly unchanged c. Such phase transition is demonstrated by the temperature-dependent dielectric constants and accordingly calculated dispersion degree. The oxygen vacancy migration is dominating polarization in the ceramics, which is con?rmed by complex impedance. Also, such migration gives birth to the hysteretic dielectric response with the increase of x. However, the energy storage performance is enhanced compared to KNN, indicating that the addition of Mg and Sn according to their energy band structures is an ef?cient way to induce the relaxor phase transition and associated good energy storage performance.