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	The thermal sensitivity and dielectric properties of SrTiO/sub 3 /-based ceramics
	Longtu Li ; Jingchang Zhao ; Zhilun Gui
	2010-05-10 ; 2010-05-10
会议名称	Ceramics International ; 3rd Asian Meeting on Electroceramics (AMEC-3) ; , Singapore ; INSPEC
关键词	Experimental/ ceramic capacitors copper compounds ferroelectric ceramics grain boundaries heat treatment lanthanum compounds lead compounds permittivity segregation semiconductor materials strontium compounds/ thermal sensitivity dielectric properties SrTiO/sub 3/-based ferroelectric ceramics strontium-lead titanate ceramics NTCR-PTCR composite effect grain boundaries room temperature resistivity negative temperature coefficient positive temperature coefficient heat treatment semiconducting ceramics conduction mechanism ceramic capacitors dielectric constant SrTiO/sub 3/ PbTiO/sub 3/ La/sub 2/-CuO-PbO/ A7720 Dielectric permittivity A7780 Ferroelectricity and antiferroelectricity A8140G Other heat and thermomechanical treatments A6170N Grain and twin boundaries B2810F Piezoelectric and ferroelectric materials B2130 Capacitors B2520 Semiconductor theory, materials and properties/ SrTiO3/ss TiO3/ss O3/ss Sr/ss Ti/ss O/ss PbTiO3/ss TiO3/ss O3/ss Pb/ss Ti/ss O/ss La2CuOPbO/ss La2/ss Cu/ss La/ss Pb/ss O/ss
中文摘要	The thermal sensitivities of SrTiO/sub 3/-based ferroelectric ceramics and the dielectric properties have been investigated. Strontium-lead titanate ceramics with variable NTCR-PTCR composite effect were prepared by controlling Pb concentration of the grain boundaries. It was efficient for lowering the room temperature resistivity ( rho /sub RT/) and weakening the negative temperature coefficient of resistance (NTCR) effect of (Sr, Pb)TiO/sub 3/ ceramics by adding a small amount of excess PbO. A transformation of thermal sensitivity from the positive temperature coefficient of resistance (PTCR) to NTCR-PTCR characteristics was also observed after a heating treatment process, showing the NTCR-PTCR composite effects of (Sr, Pb)TiO/sub 3/ semiconducting ceramics were closely related to the variation of Pb concentration at the grain boundaries. The conduction mechanism was proposed to reasonably explain the NTCR-PTCR composite effect of (Sr, Pb)TiO/sub 3/ semiconducting ceramics. SrTiO/sub 3/ ceramics capacitors were fabricated by using La/sub 2 /O/sub 3/-CuO-PbO as dopants. It exhibited a high dielectric constant with stable temperature characteristics. It was found that PbO addition benefited to increasing the dielectric constant and CuO addition mainly segregated at the grain boundaries to form the isolation layers. The relationships between the microstructures and the dielectric properties of SrTiO/sub 3/-La/sub 2/O/sub 3/-CuO-PbO system were discussed.
会议录出版者	Elsevier ; UK
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/18355]
专题	清华大学
推荐引用方式 GB/T 7714	Longtu Li,Jingchang Zhao,Zhilun Gui. The thermal sensitivity and dielectric properties of SrTiO/sub 3 /-based ceramics[C]. 见:Ceramics International, 3rd Asian Meeting on Electroceramics (AMEC-3), , Singapore, INSPEC.

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