Ba1-xCaxZr0.2Ti0.8O<sub>3</sub>陶瓷的晶体结构、储能性能及其极化机理

张校飞; 左小华; 汪汝武; 占迪

文章摘要

Ba1-xCaxZr0.2Ti0.8O₃陶瓷的晶体结构、储能性能及其极化机理

Crystal structure, energy storage properties and polarization mechanism of Ba1-xCaxZr0.2Ti0.8O₃ ceramic

DOI：

中文关键词: BaZr0.2Ti0.8O₃ 钙掺杂锆钛酸钡晶体结构介电性能储能性能极化机理

英文关键词: BaZr0.2Ti0.8O₃ calcium doping barium zirconium titanate crystal structure dielectric property energy storage polarization mechanism

基金项目:国家自然科学基金资助项目(51372077)；国家留学基金委资助项目(201808420381)；湖北理工学院引进人才资助项目(12xjz02R).

作者	单位	E-mail
张校飞	湖北理工学院数理学院,湖北黄石,435003	zhangxiaofei@whut.edu.cn
左小华	湖北理工学院化学与化工学院,湖北黄石,435003
汪汝武	武汉科技大学理学院,湖北　武汉,430065
占迪	湖北理工学院数理学院,湖北黄石,435003

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中文摘要:

采用柠檬酸盐法制备名义组成为Ba1-xCaxZr0.2Ti0.8O₃ (x=0、0.05、0.10)的陶瓷材料,分析了不同钙含量对陶瓷样品结构及储能性能的影响。结果表明,x=0和x=0.05的陶瓷材料显微结构均呈现出双峰式晶粒尺寸分布,而x=0.10的陶瓷样品晶粒大小分布均匀；随着钙含量增加,Ba1-xCaxZr0.2Ti0.8O₃晶格常数逐渐减小,晶体结构呈现单一钙钛矿相,当x=0.10时,陶瓷样品储能性能恶化；陶瓷材料储能性能与缺陷偶极子诱导的极化团簇转向行为有关。通过分析介电常数、介电损耗和交流电导率随测试频率的变化规律,证实了样品中极化实体的极化行为与氧空位跃迁存在关联。

英文摘要:

The ceramic materials with nominal composition of Ba1-xCaxZr0.2Ti0.8O₃ (x=0,0.05,0.10) were prepared by a citrate method. The effect of calcium content on structure and energy storage properties was investigated. The results show that the microstructures of the specimens with x=0 and x=0.05 display bimodal grain size distribution while the grain size for the sample with x=0.10 appears to be uniform. It has been also found that calcium doping doesn’t induce a second phase superimposed on the cubic perovskite structure within the range from x=0 to x=0.10. With increasing calcium content, lattice constants gradually decline and energy storage properties become deteriorated when x=0.10. The involution of dielectric properties under an applied electric field is demonstrated to be related with the reorientation of defect-dipole induced polar clusters. The variation of dielectric constant and loss and ac conductivity with measuring frequency are also inspected to clarify the polar species behaviors in ceramic specimens, which is in relation with oxygen vacancy hopping.

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