Conductivity and Dielectric Loss of Tungsten-Bronze-Type BaNd2Ti4O12 Microwave Ceramics

doi:10.3866/PKU.WHXB20110839

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	Conductivity and Dielectric Loss of Tungsten-Bronze-Type BaNd2Ti4O12 Microwave Ceramics
	Xia Hai-Ting 2,3; Kuang Xiao-Jun 1; Wang Chun-Hai 2; Li Wen-Xian 3; Jing Xi-Ping 2; Zhao Fei 4; Yue Zhen-Xing 4
刊名	ACTA PHYSICO-CHIMICA SINICA
	2011-08-01
卷号	27 期号:8 页码:2009-2014
关键词	Defect Conductivity Microwave Dielectric Loss Band2ti4o12 Tungsten-bronze
ISSN号	1000-6818
DOI	10.3866/PKU.WHXB20110839
英文摘要	Tungsten-bronze type titanate BaNd2Ti4O12 ceramics were synthesized by solid state reactions. The conductivity and microwave dielectric loss of the samples that were thermally treated under various conditions and Ta-doped were investigated by electrochemical impedance measurement and microwave dielectric resonator measurement. The variation in conductivity with annealing atmospheres of air, O-2, and N-2 was consistent with the defect equilibriums 2O(o)(x)<-> 2V(o)(center dot center dot) + O-2 up arrow + 2e' and Ti-Ti(x)+e'<-> Ti'(Ti), suggesting n-type conductance for BaNd2Ti4O12. Thermal treatment in air/O-2 was found to favor the elimination of the native defects V-o(x), Ti'(Ti) and weakly bound electrons thus decreasing the conductivity. Thermal treatment in a N-2 atmosphere, which had a low oxygen partial pressure, increased the defect content and the conductivity. Thermal treatment in air/O-2/N-2 did not clearly affect the microwave dielectric loss, suggesting that native defects have negligible effects on this property. The air-annealed sample was found to have lower conductivity and lower microwave loss compared with the air-quenched sample. The change in conductivity was found to be related to the equilibrium of the native defects but the change in microwave dielectric loss might be explained by the release of thermally induced lattice strain. Ta doping reduced the conductivity but increased the microwave dielectric loss. This work shows that air-annealing may be an efficient way to improve the Qxf factor for BaNd2Ti4O12 ceramics, which was enhanced by similar to 12%.
语种	英语
出版者	PEKING UNIV PRESS
WOS记录号	WOS:000292877400035
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/71369]
专题	中国科学院化学研究所
通讯作者	Kuang Xiao-Jun
作者单位	1.Sun Yat Sen Univ, Sch Chem & Chem Engn, State Key Lab Optoelect Mat & Technol, MOE Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China 2.Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China 3.Inner Mongolia Univ, Coll Chem & Chem Engn, Hohhot 010021, Peoples R China 4.Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Xia Hai-Ting,Kuang Xiao-Jun,Wang Chun-Hai,et al. Conductivity and Dielectric Loss of Tungsten-Bronze-Type BaNd2Ti4O12 Microwave Ceramics[J]. ACTA PHYSICO-CHIMICA SINICA,2011,27(8):2009-2014.
APA	Xia Hai-Ting.,Kuang Xiao-Jun.,Wang Chun-Hai.,Li Wen-Xian.,Jing Xi-Ping.,...&Yue Zhen-Xing.(2011).Conductivity and Dielectric Loss of Tungsten-Bronze-Type BaNd2Ti4O12 Microwave Ceramics.ACTA PHYSICO-CHIMICA SINICA,27(8),2009-2014.
MLA	Xia Hai-Ting,et al."Conductivity and Dielectric Loss of Tungsten-Bronze-Type BaNd2Ti4O12 Microwave Ceramics".ACTA PHYSICO-CHIMICA SINICA 27.8(2011):2009-2014.