Effect of SiO2 additive on dielectric response and energy storage performance of Ba0.4Sr0.6TiO3 ceramics
Effect of SiO2 additive on dielectric response and energy storage performance of Ba0.4Sr0.6TiO3 ceramics
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DOI：
10.1016/j.ceramint.2016.04.169
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发表时间：
2016-08
影响因子：
5.2
通讯作者：
C. Diao;Hanxing Liu;H. Hao;M. Cao;Z. Yao
中科院分区：
文献类型：
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作者：
C. Diao;Hanxing Liu;H. Hao;M. Cao;Z. Yao
采用传统固相反应法制备了添加SiO2的钛酸锶钡陶瓷Ba0.4Sr0.6TiO3-xwt%SiO2（x=0，0.5，1，3，BSTSx）。研究了SiO2添加剂对复合材料微观结构、介电响应和储能性能的影响。结果表明，随着SiO2添加量的增加，材料发生扩散相变，介电常数降低。采用等效电路模型和Arrhenius定律计算了晶粒和晶界的激活能，表明高温介电弛豫是由氧空位引起的。适量SiO2的加入有利于提高材料的击穿强度，但进一步增加SiO2的含量会降低材料的致密化程度，降低材料的储能性能。最后，BSTS 0.5陶瓷的储能性能得到优化：介电常数为1002，介电损耗为0.45%，能量密度为0.86 J/cm 3，在134 kV/cm下储能效率为79%。
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 SiO2additive on the microstructure, dielectric response and energy storage properties was investigated. The results confirmed that with the increase of SiO2additive, 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 SiO2additive led to improve the breakdown strength, further increase of SiO2deteriorated 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/cm3and energy storage efficiency of 79% at 134 kV/cm.