材料科学
晶界
电介质
陶瓷
复合材料
扫描电子显微镜
电阻率和电导率
介电常数
大气温度范围
扩散
耗散因子
介电损耗
晶界扩散系数
分析化学(期刊)
微观结构
热力学
光电子学
物理
化学
色谱法
电气工程
工程类
作者
Haochen Xie,Yongping Pu,Yangchao Shang,Panzhe Qiao,Yuxin Hao,Lei Zhang,Bo Wang,Jie Qian
标识
DOI:10.1016/j.ceramint.2024.01.009
摘要
High-performance Sr0.99La0.01TiO3 ceramics were synthesized using a conventional solid-phase method, and Sr0.99La0.01TiO3 percolated (SLT10-P) samples with excellent resistivity were obtained by coating with an oxidant and heat treatment. In this work, simultaneous excellent dielectric properties (16667 of dielectric permittivity, 0.016 of loss tangent at 1 kHz) and high resistivity (1.44 × 1011 Ω cm at DC100V) was achieved in SLT10-P ceramics at room temperature by modulating the duration of thermal treatment. X-ray Diffraction and scanning electron microscope analyses proved the diffusion of the oxidant in the grains and grain boundaries during the heat treatment. The increase in grain boundary resistance is mainly due to the fact that the insulating layer formed by the oxide ions entering the grain boundary hinders the long-range movement of electrons. In addition, the diffusion of oxygen from the air into the ceramic during the heat treatment process also contributes to the insulation of grain boundaries.
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