CaTiO_3:Zn溶胶-凝胶法制备、结构及介电性能(英文)  

Preparation,Structure and Dielectric Properties of CaTiO_3∶Zn Ceramics Based on Sol-Gel Technology

作　　者：黄万群[1] 张启龙[1] 杨辉[1] 申乾宏[1] 

机构地区：[1]浙江大学材料科学与工程学系,杭州310027

出　　处：《无机化学学报》2012年第11期2379-2384,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家科技支撑计划(No.2009BAG12A07);浙江省创新团队(No.2011R09010)资助项目

摘　　要：采用溶胶-凝胶法制备了CaTiO3∶Zn纳米粒子,透射电镜图显示平均粒径为25 nm。Zn的掺杂位置对于陶瓷相组成和烧结特性有很大影响。Ca1-xZnxTiO3和CaTiO3+zZnO样品的Zn以Zn2TiO4相形式存在;而CaZnyTi1-yO3-δ(y=0.01)样品中的Zn进入Ti位形成固溶体,无明显的降温效果,当Zn量增至0.05和0.1时,出现ZnO相。ZnO和Zn2TiO4第二相的存在均能明显促进陶瓷烧结。CaTiO3∶Zn超细粉体可在较低温度下致密烧结(≤1 250℃)。1 250℃烧结的CaZnyTi1-yO3-δ(y=0.01)陶瓷具有较好的介电性能:介电常数ε=157,品质因数Q×f=6 819 GHz,谐振频率温度系数τf=7.51×10-4℃-1。Abstract： Nano-sized CaTiO3：Zn particles were synthesized by a sol-gel technique. The average particle size of the powder calculated from TEM micrograph is 25 nm. Zn substitution site has great influence on the phase composition and the sintering temperature of the ceramics. The added Zn exists as Zn2TiO4 phase for Ca1-xZnxTiO3 and CaTiO3＋zZnO. However, for Ca （Zny, Ti1-y）O3-8 （y=0.01）, Zn substitutes for Ti site and forms a solid solution, which has no obvious effect on sintering characteristics. When the y value is 0.05 and 0.1, ZnO phase is formed. The existence of ZnO or Zn2TiO4 phase can improve the sintering properties. The ultrafine CaTiO3：Zn powders can be sintered at relatively lower temperatures （≤ 1250 ℃）. CaZnrTi1-yO3-δ（y=0.01） sintered at 1 250℃ possesses a dielectric constant εrof 157, a Qxfvalue of 6819 GHz and a Tfvalue of 7.51×10^-4℃^-1.

关 键 词：CaTiO3:Zn溶胶-凝胶法 纳米粉体 介电性能 

分 类 号：TQ174[化学工程—陶瓷工业]