Effect of SiO2 additive on dielectric response and energy storage performance of Ba0.4Sr0.6TiO3 ceramics |
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| Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Department of Physics, Henan University, Kaifeng 475004, China;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;2. School of Finance, Capital University of Economics and Business, Beijing, 100070, China;1. College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China;2. Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu 610065, China;1. School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China;2. China-Australia Institute for Advanced Materials and Manufacturing, Jiaxing University, Jiaxing, Zhejiang 34001, China |
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| Abstract: | SiO2-added barium strontium titanate ceramics Ba0.4Sr0.6TiO3-xwt%SiO2 (x=0, 0.5, 1, 3, BSTSx) were prepared via a traditional solid state reaction method. The effect of SiO2 additive on the microstructure, dielectric response and energy storage properties was investigated. The results confirmed that with the increase of SiO2 additive, diffuse phase transition arises and the dielectric constant decreases. An equivalent circuit model and Arrhenius law were used to calculate the activation energy of grain and grain boundary, which indicated that the dielectric relaxation at high temperature was caused by oxygen vacancy. While appropriate SiO2 additive led to improve the breakdown strength, further increase of SiO2 deteriorated the energy storage because of the low densification. Finally, optimized energy storage performance was obtained for BSTS0.5 ceramics: dielectric constant of 1002, dielectric loss of 0.45%, energy density of 0.86 J/cm3 and energy storage efficiency of 79% at 134 kV/cm. |
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| Keywords: | C. Dielectric properties Energy storage |
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