Effect of grain size on the energy storage properties of (Ba0.4Sr0.6)TiO3 paraelectric ceramics
Effect of grain size on the energy storage properties of (Ba0.4Sr0.6)TiO3 paraelectric ceramics
复制标题
晶粒尺寸对(Ba0.4Sr0.6)TiO3顺电陶瓷储能性能的影响
DOI：
10.1016/j.jeurceramsoc.2013.11.039
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发表时间：
2014
影响因子：
5.7
通讯作者：
Yu Zhiyong
中科院分区：
文献类型：
--
作者：
Song Zhe;Liu Hanxing;Zhang Shujun;Wang Zhijian;Shi Yatong;Hao Hua;Cao Minghe;Yao Zhonghua;Yu Zhiyong
采用传统的固相反应法制备了不同晶粒度(0.5~5.6μm)的(Ba0.4Sr0.6)TiO3(BST)陶瓷。研究了晶粒度对BST陶瓷(TC≈和−65°C)储能性能的影响。随着颗粒尺寸的减小，样品呈现明显的弥散相变趋势，介电非线性逐渐减小，这可以用Devonshire的唯象理论(从本征极化的观点)来解释。基于多极化机制模型，研究了极化纳米区域的极化行为(非本征非线性极化机制)与晶粒尺寸的关系。基于双层介电模型的复阻抗谱分析证实了晶界密度的变化对介电击穿强度的提高起着重要的作用，说明了能量密度的提高。
(Ba0.4Sr0.6)TiO3(BST) ceramics with various grain sizes (0.5–5.6 μm) were prepared by conventional solid state reaction methods. The effect of grain size on the energy storage properties of BST ceramics (Tc≈ −65 °C) was investigated. With decreasing grain sizes, a clear tendency toward the diffuse phase transition was observed and the dielectric nonlinearity was reduced gradually, which can be explained by the Devonshire's phenomenological theory (from the viewpoint of intrinsic polarization). Based on the multi-polarization mechanism model, the relationship between the polarization behavior of polar nano-regions (the extrinsic nonlinear polarization mechanisms) and grain size was studied. The variation of the grain boundary density was thought to play an important role on the improvement of dielectric breakdown strength, account for the enhanced energy density, which was confirmed by the complex impedance spectroscopy analysis based on a double-layered dielectric model.