BST–MT复相陶瓷的微观形貌和相组成分析  

ANALYSIS ON MICROSTRUCTURE AND PHASE COMPONENTS OF BST-MT COMPOSITE CERAMICS

作　　者：李明利[1] 徐明霞[1] 梁辉[1] 李晓雷[1] 徐廷献[1] 

机构地区：[1]天津大学材料科学与工程学院教育部先进陶瓷与加工技术重点实验室,天津300072

出　　处：《硅酸盐学报》2008年第6期765-768,共4页Journal of The Chinese Ceramic Society

基　　金：天津市自然科学基金(013603811);高等学校博士点专项基金(20030056001)资助项目

摘　　要：以硝酸钡、硝酸锶和钛酸丁酯为原料,采用草酸盐共沉淀法制备了钛酸锶钡(Ba0.6Sr0.4TiO3,BST)纳米粉体。用固相混合法制备了BST–钛酸镁(Ba0.6Sr0.4TiO3–MgTiO3,BST–MT)复相陶瓷。用扫描电镜观察BST纳米粉体和BST–MT复相陶瓷的形貌。通过X射线衍射分析BST纳米粉体和BST–MT复相陶瓷的相组成。结果表明:草酸盐共沉淀法合成了立方晶相的BST粉体,该纳米粉体具有较好的分散性且形貌规整。用BST粉体与MgTiO3复合所制备的BST–MT复相陶瓷由等轴状和长柱状2种晶粒组成。能谱分析结果表明:等轴状晶粒为BST,长柱状晶粒为MgTiO3;该BST–MT复相陶瓷具有良好的介电常数–温度特性。Barium strontium titanate （Ba0.6Sr0.4TiO3） nano-powders were prepared from Ba（NO3）2, Sr（NO3）2, oxalic acid dehydrate, and tetrabutyl titanate （Ti（OC4H9）4） as raw materials by the co-precipitation method. Barium strontium titanate composites doped by magnesium titanate （BST-MT） were obtained by the traditional solid phase method. Their structures and morphology were characterized by X-ray diffraction and scanning electron microscope （SEM）. The experimental results show that the Ba0.6Sr0.4TiO3 nano-powders obtained by the aforementioned technique are well dispersed, with an orbicular morphology. The SEM results also show that the microstructure of BST-MT is composed of both orbicular and virgulate crystal grains. Further investigation by energy dispersive spectroscopy analysis shows that the orbicular grains were BST and the virgulate grains were MT. The BST-MT composites showed good dielectric constant-temperature properties.

关 键 词：钛酸锶钡 复相陶瓷 微观结构 介电性能 

分 类 号：O643.32[理学—物理化学]