Ba(Mg_(1/3)Nb_(2/3))O_3陶瓷的纳米粉体制备及其微波介电性能  

Preparation of nanometric powders of Ba(Mg_(1/3)Nb_(2/3))O_3 ceramics and its microwave dielectric properties

作　　者：张菡[1] 徐利华[1] 夏雯[1] 连芳[1] 邸云萍[1] 

机构地区：[1]北京科技大学材料科学与工程学院无机非金属材料系,北京100083

出　　处：《云南大学学报（自然科学版）》2005年第S3期488-492,共5页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家科技攻关资助项目(2003BA612-18);国家自然科学基金资助项目(50332010;50172008)

摘　　要：采用SCF-Xα-SW方法对Ba(Mg1/3Nb2/3)O3(BMN)体系进行电子结构计算,预测了BMN材料的介电性能.以Nb2O5作为起始原料,运用热碱反应合成Nb2O5.nH2O胶体,而后与钡、镁醋酸盐共混反应合成BMN粉末.利用该简便且成本低廉的湿化学工艺,得到了平均粒径为100 nm的单相BMN纳米粉末.通过对烧结后的BMN陶瓷的性能测量,发现该陶瓷具有较佳的微波介电特性(Q为10397.8,1.45 GHz).The electronic structure of Ba(Mg_(1/3)Nb_(2/3))O_3(BMN) material was calculated and its dielectric properties were also forecasted.Nanometric BMN powders were synthesized by easily operated and inexpensive wet chemical route.In the process,Nb_2O_5·nH_2O colloid can be attained through the reaction between precursor Nb_2O_5 and melting alkali.When mixed it with barium acetate and magnesium acetate as a certain proportion,nanometric BMN powders were finally fabricated by these mixtures after heat treatment,experimental results have indicated that the average particle size is 100nm.By means of measurement,the as sintered nano-ceramic has excellent microwave dielectric properties,i.e.Q=10?397.8 at 1.45?GHz.

关 键 词：Ba(Mg1/3Nb2/3)O3纳米粉体 Nb2O5.nH2O胶体 湿化学技术 微波介电特性 

分 类 号：TB383.1[一般工业技术—材料科学与工程]