硅酸盐学报

K0.5Na0.5NbO3–xBiMg0.5Ti0.5O3电介质陶瓷的结构与储能性能

作者：贺薪瑜管泽浩王晓智王振行郇宇

分类号：TQ174.75

出版年,卷(期):页码：2019,47(2):0-0

DOI：10.14062/j.issn.0454-5648.2019.02.20

摘要：

利用固相法制备了K0.5Na0.5NbO3 (KNN)–xBiMg0.5Ti0.5O3电介质陶瓷，研究了BiMg0.5Ti0.5O3对KNN基陶瓷储能性质的影响。结果表明，当x<0.1时，BiMg0.5Ti0.5O3可完全固溶进入晶格，并且随着掺杂量的增加，晶体结构逐步由正交相变成厭立方相，晶粒尺寸降低，致密度提高，因此陶瓷的储能密度和储能效率逐步增加，在x=0.1时，获得最佳储能性能：击穿场强约195 kV/cm，储能密度约1.25 J/cm3，储能效率约85.3%。

A lead-free electrical ceramic K0.5Na0.5NbO3(KNN)–xBiMg0.5Ti0.5O3 was prepared by a conventional solid-state method. The influence of BiMg0.5Ti0.5O3 on the energy-storage performance of KNN-based ceramics was investigated. The results show that BiMg0.5Ti0.5O3 can be diffused completely into the K0.5Na0.5NbO3 lattice when x < 0.1. The crystal structure changes from orthorhombic phase to pseudo-cubic phase when BiMg0.5Ti0.5O3 content increases. In addition, the grain size decreases and the density increases with increasing BiMg0.5Ti0.5O3 content, resulting in an enhanced energy-storage energy and an efficiency. The optimum energy density of 1.25 J/cm3 and energy storage efficiency of 85.3% are obtained as x = 0.1 under the breakdown strength of 195 kV/cm.

基金项目：

国家自然科学基金青年项目(51702119)；中国博士后科学基金面上项目(2017M612177)；济南大学博士后科研启动基金(XBH1701)。

作者简介：

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