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Energy storage performance of silica-coated k0.5Na0.5NbO3-based lead-free ceramics |
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| Authors: | Chen Wenzhang Cao Minghe Wang Hongye Hao Hua Yao Zhonghua Liu Hanxing |
| Affiliation: | 1.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Material Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China ;2.International School of Material Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China ; |
| Abstract: | Potassium sodium niobate-based ceramics have been extensively studied as high-power energy storage capacitor in recent years due to their excellent dielectric properties. We investigated the microstructure, dielectric-temperature spectrum, and energy storage properties of SiO2-coated 0.9(k0.5Na0.5)NbO3–0.1Bi(Zn2/3Nb1/3)O3 (0.9KNN–0.1BZN) ceramics prepared by solid-state sintering and Stöber method. During the sintering process, SiO2 reacted with 0.9KNN–0.1BZN to form the second phase K3Nb3O6Si2O7. Coating SiO2 could improve the dielectric-temperature stability of 0.9KNN–0.1BZN ceramics, and had excellent performance adapting to high-temperature conditions. When the SiO2 content is 1.0 wt%, the maximum energy storage density of 0.9KNN–0.1BZN ceramics is 0.97 J/cm3, and the breakdown field strength is 200 kV/cm. This work expands the application of (k0.5Na0.5)NbO3 ceramics in the field of energy storage capacitors. |
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