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	La-Nb共掺杂BaTiO_3陶瓷显微结构研究
	王悦辉 ; 周济 ; 王婷 ; Wang Yuehui ; Zhou Ji ; Wang Ting
	2010-06-10 ; 2010-06-10
关键词	BaTiO3 La-Nb 显微结构 BaTiO3 La-Nb microstructure TQ174.1
其他题名	Microstructure Characteristics of BaTiO_3 Ceramic Codoped with La-Nb
中文摘要	采用传统固相反应法对水热BaTiO3粉体进行La2O3和Nb2O5双施主复合掺杂,研究(Ba1-xLa2x/3)(Ti1-xNb4x/5)O3陶瓷显微结构特征。结果表明:随着x的增大,晶体结构逐渐由四方相转为立方相。当x≤0.03时,La3+、Nb5+固溶进入BaTiO3晶格形成单一的钙钛矿相;当x=0.05时,出现Ba6Ti17O40富钛第二相;当x≥0.2时,出现Ba-Ti-La-Nb固溶组分的第二相,说明施主掺杂固溶极限x<0.2。当x=0.001时,瓷体具有半导化特征,晶粒尺寸为8～10μm;当x≥0.004时,瓷体开始呈现绝缘性,施主离子表现出明显的抑制晶粒生长作用,随着x增加,晶粒尺寸由10μm(x=0.004)下降至0.5μm(x=0.3)。TEM和EDS分析表明,La3+、Nb5+双施主复合掺杂,La3+提高了Nb5+的扩散固溶能力,相互协同作用使掺杂离子在BaTiO3中分布更均匀。; The microstructure characteristics were studied for the (Ba1-xLa2x/3)(Ti1-xNb4x/5)O3 ceramics modified by codoping with La2O3 and Nb2O5 from hydrotherrmally-synthesized-BaTiO3 using conventional solid-state reaction technique in this paper. With the increase of composition x,the crystal structure changed from tetragonal to cubic. When x≤0.03,a single phase was formed and the secondary titanium-rich phase occurred when x=0.05; but the secondary phase of Ba-Ti-La-Nb solid solution appeared when x≥0.2. For x=0.001,the product was semiconducting with a average grains size of about 10 μm; but insulating for x≥0.004. With the increase of x,the grain size decreased from 10 μm(x=0.004)to 0.5 μm(x=0.3). The solid solution ability of Nb5+ was improved by La3+ with a more homogeneous distribution of constituent elements in BaTiO3 by the codoping of La3+-Nb5+.; 国家“863”计划(2003AA32G030); 国家“973”计划(2002CB61306和2001CB6104); 国家基金(50425204); 国家自然科学基金(50272032)资助
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/61132]
专题	清华大学
推荐引用方式 GB/T 7714	王悦辉,周济,王婷,等. La-Nb共掺杂BaTiO_3陶瓷显微结构研究[J],2010, 2010.
APA	王悦辉,周济,王婷,Wang Yuehui,Zhou Ji,&Wang Ting.(2010).La-Nb共掺杂BaTiO_3陶瓷显微结构研究..
MLA	王悦辉,et al."La-Nb共掺杂BaTiO_3陶瓷显微结构研究".(2010).

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