Li_2ZnTi_3O_8纳米粉体的溶胶凝胶法制备与介电性能研究（英文）  

Preparation and Dielectric Properties of Li_2ZnTi_3O_8 Nanoparticles by Sol-gel Method

作　　者：胡靓[1] 于丹[1] 徐诺心 程笛[1,2] 张启龙 

机构地区：[1]浙江大学,浙江杭州310027 [2]浙江加州国际纳米技术研究院,浙江杭州310058

出　　处：《稀有金属材料与工程》2016年第S1期320-324,共5页Rare Metal Materials and Engineering

基　　金：the National High Technology Research and Development Program of China(“863”Program)(2013AA030701)

摘　　要：采用表面活性剂辅助溶胶-凝胶法合成了Li2ZnTi3O8纳米粉体,并以该粉体为原料制备了Li2ZnTi3O8陶瓷。利用X射线衍射和透射电镜分析了粉体的相组成、颗粒形貌和尺寸分布。利用X射线衍射和扫描电镜表征了陶瓷的相组成和微观结构。同时研究了纳米效应对于陶瓷烧结性能和介电性能的影响。结果表明:溶胶-凝胶法可获得尺寸为4070nm、尺寸分布窄、分散性好的单相Li2ZnTi3O8纳米粉体。溶胶-凝胶法制备的纳米粉体具有更低的烧结温度,在950℃的低温下就可以烧结得到致密的陶瓷,且该陶瓷具有较好的介电性能:er=25.12,Q×f=47,069GHz。利用溶胶-凝胶法制备的Li2ZnTi3O8可应用于低温共烧技术。A surfactant assisted sol-gel process was adopted to synthesize Li_2ZnTi_3O_8 nanoparticles, which was then used to prepare dielectric ceramics. The phase composition, particle morphology and size distribution of the nanoparticles were characterized by XRD and TEM, respectively. The crystalline phases and microstructure of the ceramics were also determined by XRD and SEM, respectively. The effect of nanoparticles on the sintering behavior and microwave dielectric properties of the ceramics was also investigated. The obtained Li_2 ZnTi_3O_8 nanoparticles have an average particle size of 40~70 nm and narrow distribution. Well-densified Li_2ZnTi_3O_8 ceramics can be prepared from as synthesized nanoparticles at lower sintering temperature of 950 °C and they obtain good dielectric properties(er = 25.12 and Q × f = 47,069 GHz). The Li2 ZnTi_3O_8 ceramics synthesized by the sol-gel method are candidates for low temperature co-firing ceramics application.

关 键 词：溶胶凝胶 Li2ZnTi3O8 纳米粉体 微观结构 介电性能 

分 类 号：TB383.1[一般工业技术—材料科学与工程]