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	Novel BaTiO3-Ag composites with ultra-high dielectric constants satisfying X7R specifications
	Gui, ZL ; Chen, RZ ; Wang, XH ; Li, LT
	2010-05-10 ; 2010-05-10
会议名称	DEVELOPMENTS IN DIELECTRIC MATERIALS AND ELECTRONIC DEVICES ; 106th Annual Meeting of the American-Ceramic-Society ; Indianapolis, IN ; Web of Science
关键词	PERCOLATION-THRESHOLD BARIUM-TITANATE ELECTRICAL-CONDUCTIVITY CRITICAL-BEHAVIOR SILVER SYSTEM Engineering, Electrical & Electronic Materials Science, Ceramics Physics, Condensed Matter
中文摘要	Ferroelectric-metal composites have been characterized for their dielectric and ferroelectric properties. In this paper we describe some new composites, using a simple powder processing route. The composites are based on the percolation theory and comprise an insulating ceramic matrix based on barium titanate (BaTiO3) and small, homogeneously distributed silver (Ag) metallic particles. The XRD analysis indicates that no phases other than BaTiO3 and silver are present in the ceramics. The BaTiO3-Ag composites show an interesting change of dielectric properties with increasing metal concentration. When the Ag content is 14.7 vol %, the composite shows extraordinarily high room-temperature dielectric constant about 42100, almost ten times of 4387, that of Ag-free ceramics, and this composite still has low dielectric loss and temperature-stable property satisfying X7R specifications. According to the percolation theory, the percolation threshold, f(c) is 16.7 vol %, very close to that for the continuous percolation model, and the critical exponent, q is 1.117, higher than the theoretical result, 0.735, which means the size of metallic Ag is bigger than that of BaTiO3 ceramic matrix after sintering. The composites can be used for capacitors with very large capacitance with X7R specifications.
会议录出版者	AMER CERAMIC SOC ; WESTERVILLE ; 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/18426]
专题	清华大学
推荐引用方式 GB/T 7714	Gui, ZL,Chen, RZ,Wang, XH,et al. Novel BaTiO3-Ag composites with ultra-high dielectric constants satisfying X7R specifications[C]. 见:DEVELOPMENTS IN DIELECTRIC MATERIALS AND ELECTRONIC DEVICES, 106th Annual Meeting of the American-Ceramic-Society, Indianapolis, IN, Web of Science.

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