简化共沉淀法制备CaCu3Ti4O12陶瓷及其介电性能研究

贾然; 顾访; 吴珍华; 赵学童; 李建英

doi:10.7498/aps.61.207701

摘要

具有巨介电常数的CaCu3Ti4O12陶瓷是一种理想的高储能密度电容器材料. 本文以草酸为沉淀剂、以乙酸铵为调节pH值的定量缓冲剂, 获得制备CaCu3Ti4O12陶瓷的简化共沉淀法.确定了pH=3.0为制备前驱粉料的最佳反应条件.通过显微分析和介电性能测量,发现在1040℃-1100℃ 范围内,随着烧结温度的提高,陶瓷的晶粒尺寸增大,非线性系数上升,电位梯度和介电损耗下降, 1100℃烧结的试样tanδ 最低达到0.04.认为CaCu3Ti4O12 陶瓷介电损耗包含直流电导分量、低频松弛损耗和高频松弛损耗.低频松弛活化能为0.51 eV, 对应于晶界处的Maxwell-Wagner松弛极化;高频松弛过程活化能为0.10 eV, 对应晶粒内部的氧空位缺陷.烧结温度的升高导致晶界电阻下降.

关键词:

Abstract

Precursor powder of CaCu3Ti4O12 is prepared by a simplified coprecipitation process, in which an optimum reaction condition with ammonium acetate is used as buffer solution and pH=3.0 is proved by X-ray diffraction and scanning electron microscope. The CaCu3Ti4O12 ceramics samples are prepared by sintering the calcined powder at different temperatures (1040℃-1100℃). It is found that higher sintering temperature of CaCu3Ti4O12 ceramics will lead to lager grain size, higher dielectric constant and lower dielectric loss. The dielectric loss of CaCu3Ti4O12 ceramics is suggested to be due to DC electric conductivity, low-frequency relaxation loss and high-frequency relaxation loss. The low-frequency and high-frequency relaxations are related to grain boundary and oxygen vacancy defects respectively.

Keywords:

作者及机构信息

1.
西安交通大学,电力设备电气绝缘国家重点实验室, 西安 710049

基金项目: 国家自然科学基金(批准号: 50977071, 50972118, 51177121)资助的课题.

Authors and contacts

1.
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 50977071, 50972118, 51177121).

参考文献

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[13]	Fang T T, Liu C P 2005 Chem. Mater. 17 5167
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[21]	Zang G Z, Zhang J L, Zheng P, Wang J F, Wang C L 2005 J. Phys. D: Appl. Phys. 38 1824
[22]	Morrison F D, Sinclair D C, West A R 2001 J. Am. Ceram. Soc. 84 531
[23]	Li W, Schwartz R W 2007 Phys. Rev. B 75 012104
[24]	Li J Y, Zhao X T, Li S T, Alim M A 2010 J. Appl. Phys. 108 104104
[25]	Li J Y, Xu T W, Li S T, Jin H Y, Li W 2010 J. Alloys Compd. 506 L1

施引文献

[1]	Subramanian M A, Dong L, Duan N, Reisner B A, Sleight A W 2000 Solid State Chem. 151 323
[2]	Ramirez A P, Subramanian M A, Gardel M, Blumberg G, Li D, Vogt T, Shapiro S M 2000 Solid State Commun. 151 217
[3]	Subramanian M A, Sleight A W 2002 Solid State Sci. 4 347
[4]	He L X, Neaton J B, Cohen M H, Vanderbilt D, Homes C C 2002 Phys. Rev. B 65 214112
[5]	He L X, Neaton J B, Vanderbilt D, Choen M H 2003 Phys. Rev. B 67 012103
[6]	Cohen M H, Neaton J B, He L X, Vanderbilt D 2003 J. Appl. Phys. 94 3299
[7]	Zhang L, Tang Z 2004 Phys. Rev. B 70 174306
[8]	Tselev A, Brooks C M, Anlage S M, Zheng H, Riba L S, Ramesh R, Subramanian M A 2004 Phys. Rev. B 70 144101
[9]	Chiodelli G, Massarotti V, Capsoni D, Bini M, Azzoni C B, Mozzati M C, Lupotto P 2004 Solid State Commun. 132 241
[10]	Fang L, Shen M, Cao W 2004 J. Appl. Phys. 95 6483
[11]	Homes C C, Vogt T, Shapiro S M, Wakimoto S, Subramanian M A, Ramirez A P 2003 Phys. Rev. B 67 092106
[12]	Chen L, Chen C L, Lin Y, Chen Y B, Chen X H, Bontchev R P, Park C Y, Jacobson A J 2003 Appl. Phys. Lett. 82 2317
[13]	Fang T T, Liu C P 2005 Chem. Mater. 17 5167
[14]	Fang T T, Shiau H K 2004 J. Am. Ceram. Soc. 87 2072
[15]	Fu D S, Taniguchi H, Taniyama T, Itoh M, Koshihara S Y 2008 Chem. Mater. 20 1694
[16]	Yang C H, Zhou X L, Xu G, Han G R, Weng W J, Du P Y 2006 J. Chin. Ceram. Soc. 34 753 (in Chinese) [杨昌辉, 周小莉, 徐刚, 韩高荣, 翁文剑, 杜丕一 2006 硅酸盐学报 34 753]
[17]	Guillemet-Fritscha S, Lebeyb T, Boulosa M, Duranda B 2006 J. Eur. Ceram. Soc. 26 1245
[18]	Marchin L, Guillemet-Fritsch S, Durand B 2007 Prog. Solid State Chem. 36 151
[19]	Yang Y, Li S T 2010 J. Inorg. Mater. 25 835 (in Chinese) [杨雁, 李盛涛 2010 无机材料学报 25 835]
[20]	Sinclair D C, Adams T B, Morrison F D, West A R 2002 Appl. Phys. Lett. 80 2153
[21]	Zang G Z, Zhang J L, Zheng P, Wang J F, Wang C L 2005 J. Phys. D: Appl. Phys. 38 1824
[22]	Morrison F D, Sinclair D C, West A R 2001 J. Am. Ceram. Soc. 84 531
[23]	Li W, Schwartz R W 2007 Phys. Rev. B 75 012104
[24]	Li J Y, Zhao X T, Li S T, Alim M A 2010 J. Appl. Phys. 108 104104
[25]	Li J Y, Xu T W, Li S T, Jin H Y, Li W 2010 J. Alloys Compd. 506 L1

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