Ba_(0．6)Sr_(0．4)TiO_3-Mg_2TiO_4复合陶瓷材料的介电可调性及微波特性  

TUNABILITY AND MICROWAVE PROPERTIES OF Ba_(0.6)Sr_(0.4)TiO_3-Mg_2TiO_4 COMPOSITE CERAMICS

作　　者：孙建英[1] 翟继卫[1] 丑修建[1] 姚熹[1] 

机构地区：[1]同济大学功能材料研究所,上海200092

出　　处：《硅酸盐学报》2007年第11期1415-1418,共4页Journal of The Chinese Ceramic Society

基　　金：国家"973"计划(2002CB613304);上海市重点基础研究项目(06JC14070);高等学校科技创新工程重大项目培育资金。

摘　　要：采用常规的陶瓷工艺方法制备了Ba_(0.6)Sr_(0.4)TiO_3-Mg_2TiO_4(BST-MT)复合陶瓷材料,并对其相结构、介电以及可调性和微波特性进行了研究。X射线衍射和介电温度特性测试结果表明,BST-MT复合陶瓷具有BST和MT两相结构,非铁电相MT的增加降低了其铁电性,使其介电常数和介电损耗减小。介电偏压和微波性能测试结果表明,BST-MT复合材料仍能保持较高的可调性,且微波性能得到了明显改善。样品30%BST-70%MT(质量分数)在10 kHz下的介电常数为78,介电损耗为0.000 6,在外加3 kV/mm偏置电场作用下,可调性达到25%,在3.714 GHz频率下的介电损耗为0.0145。Composite ceramics of barium strontium titanate （Ba0.6Sr0.4ZiO3, BST） with magnesium titanate （Mg2ZiO4, MT） were prepared using the conventional ceramics process. X-ray diffraction analysis shows that the two-phase structures of BST and MT were formed. The dielectric constant and loss as a function of temperature decrease with the increases of the content of MT, thereby decreasing the ferroelectricity of the composite, In addition, BST-MT composite ceramics have higher tunability and better microwave properties compared with pure BST. The dielectric constant decreases to 78with a composition of 30% （in mass, the same below） BST-70% MT and dielectric loss also decreases to 0.000 6 at a measurement frequency of 10 kHz. The tunability is about 25% for the composites under an applied electric field of 3 kV/mm at 10 kHz. The dielectric loss for the composite is 0.0145 at 3.714 GHz.

关 键 词：钛酸锶钡 复相陶瓷 相结构 可调性 微波性能 

分 类 号：TM22[一般工业技术—材料科学与工程]