Effect of grain-boundary behavior on the dc electric conduction in Rb-doped CaCu3Ti4O12

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	Effect of grain-boundary behavior on the dc electric conduction in Rb-doped CaCu3Ti4O12
	Z. Yang; Y. Zhang; K. Zhang; D. Yin; R. Xiong; J. Shi
	2013
发表期刊	Journal of Materials Science-Materials in Electronics
ISSN	0957-4522
卷号	24 期号:3 页码:1063-1067
摘要	Ca1-x Rb (x) Cu3Ti4O12 (x = 0, 0.03, 0.05, 0.07 and 0.09) ceramics have been synthesized by the sol-gel method. The results of X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis indicate that a small amount of CuO and the grain boundary layers with Cu-rich and Ti-poor compositions are formed in the Rb-doped ceramic samples. The curves of dc electrical current density versus electric field strength have been collected at different temperatures, and the electrical conduction behaviors at grain boundary have been studied in detail based on the grain-boundary Schottky model. The results show that the formation of the Cu-rich and Ti-poor grain boundaries greatly affects the properties of grain-boundary Schottky potential barrier. For example, the barrier width increases with the increase on doping concentration x, and the barrier height (Dcurrency sign(B)) is also greatly enhanced as the concentration of dopants is very small, but as x is larger than 0.05, the Dcurrency sign(B) values reduce. These results should be ascribed to the second phases at grain boundary and the change of electronic structure.
部门归属	[yang, zhi ; zhang, yue ; yin, di ; xiong, rui ; shi, jing] wuhan univ, sch phys & technol, key lab artificial micro & nanostruct, minist educ, wuhan 430072, peoples r china. [zhang, yue] huazhong univ sci & technol, sch opt & elect informat, inst sensors & intelligent syst, wuhan 430074, peoples r china. [xiong, rui ; shi, jing] hubei univ, key lab green preparat & applicat funct mat, minist educ, wuhan 430062, peoples r china. [shi, jing] acad sinica, int ctr mat phys, shenyang 110015, peoples r china. [shi, jing] wuhan univ, sch phys & technol, wuhan 430072, peoples r china. ; shi, j (reprint author), wuhan univ, sch phys & technol, wuhan 430072, peoples r china. ; jingshi1956@163.com
关键词	Giant Dielectric-constant Calcium Copper Titanate Ceramics
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71644
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Yang,Y. Zhang,K. Zhang,et al. Effect of grain-boundary behavior on the dc electric conduction in Rb-doped CaCu3Ti4O12[J]. Journal of Materials Science-Materials in Electronics,2013,24(3):1063-1067.
APA	Z. Yang,Y. Zhang,K. Zhang,D. Yin,R. Xiong,&J. Shi.(2013).Effect of grain-boundary behavior on the dc electric conduction in Rb-doped CaCu3Ti4O12.Journal of Materials Science-Materials in Electronics,24(3),1063-1067.
MLA	Z. Yang,et al."Effect of grain-boundary behavior on the dc electric conduction in Rb-doped CaCu3Ti4O12".Journal of Materials Science-Materials in Electronics 24.3(2013):1063-1067.