CaTiO_(3)-Sm_(0.9)Nd_(0.1)AlO_(3) ceramics with a moderate dielectric constant and a high quality factor prepared by sol-gel auto combustion method  

作　　者：Jiamao Li Minghu Wei Chenghao Wu Shengdao Tang 

机构地区：[1]School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243032,China [2]Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Maanshan 243002,China [3]School of Mathematics and Physics,Anhui University of Technology,Maanshan 243002,China

出　　处：《Journal of Rare Earths》2021年第11期1427-1434,I0004,共9页稀土学报（英文版）

基　　金：Project supported by the Natural Science Foundation of Anhui Provincial Education Department (KJ2019A0054);the Student Research and Training Program of Anhui University of Technology (2020008)。

摘　　要：CaTiO_(3)-LnAlO_(3)(Ln=La,Nd,Sm) is a perovskite-type microwave material system characterized by a moderate dielectric constant εr,a high quality factor Q×f,and a small temperature coefficient of resonant frequency τf,making this system promising for microwave devices.However,its high synthesis temperature and sintering temperature limit its industrial applications.In our work,single phase0.7 CaTiO_(3)-0.3 Sm_(0.9)Nd_(0.1)AlO_(3)(7 CT-3 SNA) was synthesized via the sol-gel auto combustion method using citric acid as fuel at a relatively low temperature.After being calcined at 600℃ for 2 h,wellcrystallized 7 CT-3 SNA powders with 30-50 nm average particle size were achieved,suggesting good sintering activity.The new and narrow order band at about 800 cm^(-1) in the Raman spectra indicates a high ordering degree in the B site of 7 CT-3 SNA solid solution.Compared with the solid-state reaction method and co-precipitation method,the 0.7 CT-0.3 SNA ceramics fabricated by the current method possess a much lower calcination temperature,a similar εr value,and an improved Q × f value.The optimum microwave dielectric properties of εr=43.54,Q×f=54375 GHz,and τf=-6.3 ×10^(-6)/℃ are obtained for the CTSA ceramics derived from the sol-gel auto combustion process.Therefore,the 7 CT-3 SNA ceramics prepared in this study are potential dielectric materials for microwave applications,indicating that the sol-gel auto combustion method is a good alternative strategy for the fabrication of CaTiO_(3)-LnAlO_(3) ceramics.

关 键 词：SOL-GEL auto combustion method NANOPOWDER Rare earths Microwave ceramics 

分 类 号：TQ174.1[化学工程—陶瓷工业]