BaO-TiO_2-Nd_2O_3-La_2O_3系陶瓷结构与介电性质研究  

Structure and Dielectric Properties of BaO-TiO_2-Nd_2O_3-La_2O_3 Ceramic System

作　　者：张昊[1] 谢道华[1] 向勇[1] 王洪儒[1] 张志萍[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《电子科技大学学报》2001年第4期379-382,共4页Journal of University of Electronic Science and Technology of China

基　　金：国防科工委预研基金资助项目

摘　　要：在BaO-TiO2-Nd2O3(BTN)系材料中以La2O3部分取代Nd2O3后构成BaO-TiO_2-Nd_2O_3-La_2O_3(BTNL)系的结构和介电性能。实验结果证实，随着La2O3和Nd2O3摩尔比的增加，介电常数的温度系数((下降，用XRD分析证明是因为BaLa2Ti4O12和La2Ti2O7相的增加所致。在BTNL系中加入适量的添加剂可获得中温下烧结的具有超低损耗的微波陶瓷材料，可用于研制微波独石电容器。The structure and dielectric properties of the BaO-TiO_2-Nd_2O_3-La_2O_3(BTNL)system are investigated in this paper. BTNL system is the result of La2O3 partly replacing Nd2O3 in the BaO-TiO2-Nd2O3(BTN) system. By analyzing XRD diffractogram, it is proved that the temperature coefficient (( decreases with the increase of molar ratio of La2O3 and Nd2O3, because of the increase of the crystalline phases of BaLa2Ti4O12 and La2Ti2O7. Adding proper quantities additions into the BTNL system, the microwave ceramic material with ultra low loss can be achieved sintered at middle temperature, which can be used to prepare microwave monolithic capacitor.

关 键 词：晶粒 主晶相 微波陶瓷 频率特性 介电性质 

分 类 号：TM28[一般工业技术—材料科学与工程]