CCTO/Cu巨介电陶瓷

硅酸盐通报 , 2010, 29(2): 304-308.

CCTO/Cu巨介电陶瓷

郑兴华 ^1, , 肖娟 ^2, , 严容 ^3, , 黄旭 ^4, , 郑可炉 ^5,

1.福州大学材料科学与工程学院,福州,350108

2.福州大学材料科学与工程学院,福州,350108

3.福州大学材料科学与工程学院,福州,350108

4.福州大学材料科学与工程学院,福州,350108

5.福州大学物理与信息工程学院,福州,350108

基金项目: 福建省高等学校新世纪优秀人才支持计划项目(XSJRC2007-16) 福州大学发展基金(2007-XQ-01) 省属高校项目(2007F5002)

关键词：巨介电常数 , 烧结温度 , CCTO/Cu陶瓷

CCTO/Cu Ceramics with Giant Dielectric Constant

采用固相反应法制备了CaCu3Ti4O12(CCTO)/Cu陶瓷,Cu改善了CCTO陶瓷的烧结性能.Cu添加较少时,CCTO/Cu陶瓷为CCTO单相;而当Cu添加较多时,CCTO/Cu陶瓷中出现第二相,并且随烧结温度的升高,第二相由CuO变成Cu2O.CCTO/Cu陶瓷存在明显的晶粒异常长大和层状晶界相.但是,当Cu添加量达到3wt%时,层状富铜晶界相大大减少且分布不均匀.CCTO/Cu陶瓷均具有巨介电常数(>104,1 kHz)和较低的损耗(～10-1).CCTO/Cu陶瓷的巨介电常数与其半导体部分密切相关.相对于CCTO陶瓷,CCTO/Cu陶瓷介电常数具有更强的温度依赖性.

参考文献

[1]	李含,邹正光,吴一,龙飞.CaCu3Ti4O12 高介电材料的研究现状与发展趋势[J].硅酸盐通报,2009(01):121-126.
[2]	Ramirez AP.;Gardel M.;Blumberg G.;Li D.;Vogt T. Shapiro SM.;Subramanian MA. .Giant dielectric constant response in a copper-titanate[J].Solid State Communications,2000(5):217-220.
[3]	Subramanian MA.;Duan N.;Reisner BA.;Sleight AW.;Li D. .High dielectric constant in ACu(3)Ti(4)O(12) and ACu(3)Ti(3)FeO(12) phases[J].International Journal of Quantum Chemistry,2000(2):323-325.
[4]	Sinclair D C;Adams T B;Morrison F D et al.CaCu3Ti4O12:one-step internal barrier layer capacitor[J].Applied Physics Letters,2002,80(12):2153.
[5]	Homes C C;Vogt T;Shapiro S M et al.Optical response of high-dielectric-constant perovskite-related oxide[J].Science,2001,121:625-629.
[6]	Li J;Subramanian M A;Rosenfeld H D et al.Clues to the giant dielectric constant of CaCu3Ti4O12 in the defect structure of SrCu3Ti4O12[J].Chemistry of Materials,2004,6:5223-5225.
[7]	Zang GZ;Zhang JL;Zheng P;Wang JF;Wang CL .Grain boundary effect on the dielectric properties of CaCu3Ti4O12 ceramics[J].Journal of Physics, D. Applied Physics: A Europhysics Journal,2005(11):1824-1827.
[8]	Tsang-Tse Fang;Li-Then Mei .Evidence of Cu Deficiency: A Key Point for the Understanding of the Mystery of the Giant Dielectric Constant in CaCu_3Ti_4O_(12)[J].Journal of the American Ceramic Society,2007(2):638-640.
[9]	Fang T T;Mei L T;Ho H F .Effects of Cu stoichiometry on the microstructures,barrier-layer structures,electrical conduction,dielectric responses,and stability of CaCu3Ti4O12[J].Acta Materialia,2006,54:2867-2875.
[10]	Wang C;Zhang HJ;He PM;Cao GH .Ti-rich and Cu-poor grain-boundary layers of CaCu3Ti4O12 detected by x-ray photoelectron spectroscopy[J].Applied physics letters,2007(5):52910-1-52910-3-0.
[11]	Kwon A;Huang C C;Subramanian M A .Effects cation stoichiometry on the dielectric properties of CaCu3Ti4O12[J].Journal of Alloys and Compounds,2009,473:433-436.
[12]	Wang CC;Yan YJ;Zhang LW;Cui MY;Xie GL;Cao BS .Maxwell-Wagner relaxation in CaCu3Ti4O12/Ag composites[J].Scripta materialia,2006(8):1501-1504.

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