Intergrain connectivity of MgB2 ceramics studied by impedance analysis

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	Intergrain connectivity of MgB2 ceramics studied by impedance analysis
	Wang, CC ; Wang, C ; Zeng, R ; Dou, SX
刊名	JOURNAL OF APPLIED PHYSICS
	2010
卷号	108 期号:2
关键词	CRITICAL-CURRENT DENSITY SUPERCONDUCTING MGB2 SPECTROSCOPY RESISTIVITY WIRES STATE FILMS
ISSN号	0021-8979
通讯作者	Wang, CC: Univ Wollongong, Inst Superconducting & Elect Mat, Northfield Ave, Gwynneville, NSW 2522, Australia.
中文摘要	First, by using of the conventional Rowell analysis, we demonstrated that the addition of nano BN particles can effectively eliminate MgO and pores in MgB2 resulting in a very high density and good. connectivity of BN-doped MgB2. Then, another method-low-frequency dielectric impedance analysis was introduced to characterize the properties of the grain boundaries of MgB2. A comparative impedance study was performed in the frequency range from 100 Hz to 100 MHz on pure and nano BN-doped MgB2. The study revealed some following interesting results: (1) a dielectric resonance around frequency of 10(8) in both samples was observed, which was argued to be related to an inductance-capacitance and (2) the pure sample has two dielectric relaxations originating from intergrains, while the doped sample has only one intergranular contribution. This convinces that the electric connectivity of the doped sample is really improved by the addition of nano BN particles. Our results indicate that dielectric technique may be a useful tool to characterize the grain boundary properties and grain boundary-related properties of MgB2. (C) 2010 American Institute of Physics. [doi:10.1063/1.3462398]
收录类别	SCI
资助信息	Australian Research Council [DP0770205]
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/40154]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Wang, CC,Wang, C,Zeng, R,et al. Intergrain connectivity of MgB2 ceramics studied by impedance analysis[J]. JOURNAL OF APPLIED PHYSICS,2010,108(2).
APA	Wang, CC,Wang, C,Zeng, R,&Dou, SX.(2010).Intergrain connectivity of MgB2 ceramics studied by impedance analysis.JOURNAL OF APPLIED PHYSICS,108(2).
MLA	Wang, CC,et al."Intergrain connectivity of MgB2 ceramics studied by impedance analysis".JOURNAL OF APPLIED PHYSICS 108.2(2010).