新铌酸盐Ba_3Nd_2Ti_2Nb_2O_(15)的结构与微波介电特性  

Structure and Microwave Dielectric Properties of a New Niobate Ba_3Nd_2Ti_2Nb_2O_(15)

作　　者：胡长征[1] 朱文凤[1] 吴伯麟[1] 张桂玲[1] 

机构地区：[1]桂林工学院有色金属材料及加工新技术教育部重点实验室

出　　处：《武汉理工大学学报》2008年第1期28-31,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50572078,20571059)

摘　　要：采用高温固相反应合成了A5B4O15型五层类钙钛矿结构新铌酸盐Ba3Nd2Ti2Nb2O15。Ba3Nd2Ti2Nb2O15晶体为三方晶系,空间群P3-ml(164),晶胞参数a=5.6532(1),c=11.6117(2),V=321.377(6)3,Z=1。Ba3Nd2Ti2Nb2O15陶瓷在微波频段具有较高的室温介电常数40.1,具有较高的Qf值19 606 GHz,接近于零的谐振频率温度系数+12×10-6K-1,因此,Ba3Nd2Ti2Nb2O15极有可能成为一种新型的介质微波陶瓷材料。A new niobate Ba3Nd2Ti2Nb2O15 was synthesized by high temperature solid state reaction in the BaO-Nd2O3-TiO2-Nb2O5 system.The chemical compositions,crystal structure,microstructure,and microwave dielectric properties of the new compound were characterized.Ba3Nd2Ti2Nb2O15 crystallizes in trigonal system with space group P3-ml(164)and lattice constants a=5.653 2(1) ?,c=11.611 7(2) ?,V=321.377(6) ?3,Z=1.The Ba3Nd2Ti2Nb2O15 ceramic exhibits a high dielectric constant of 40.1,high quality factors(Q) 3 390(at 5.7...

关 键 词：铌酸盐 类钙钛矿结构 介电特性 

分 类 号：O611.3[理学—无机化学]