Effect of Sb-site nonstoichiometry on the structure and microwave dielectric properties of Li_(3)Mg_(2)Sb_(1-x)O_(6) ceramics  

作　　者：Cuijin PEI Jingjing TAN Yang LI Guoguang YAO Yanmin JIA Zhaoyu REN Peng LIU Huaiwu ZHANG 

机构地区：[1]School of Science,Xi’an University of Posts and Telecommunications,Xi’an 710121,China [2]School of Physics,Northwest University,Xi’an 710069,China [3]College of Physics and Information Technology,Shaanxi Normal University,Xi’an 710062,China [4]State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China

出　　处：《Journal of Advanced Ceramics》2020年第5期588-594,共7页先进陶瓷（英文）

基　　金：support from the National Natural Science Foundation of China (Grant No.51402235);China Postdoctoral Science Foundation (2015M582696);Science and Technology Plan Project of Xi’an Bureau of Science and Technology (GXYD17.19);Education Department of Shaanxi Province (18JK0711);Innovation Funds of Graduate Programs of Xi’an University of Posts and Telecommunications (CXJJLD2019020)

摘　　要：The non-stoichiometric Li_(3)Mg_(2)Sb_(1-x)O_(6)(0.05≤x≤0.125)compounds have been prepared via the mixed oxide method.The influences of Sb nonstoichiometry on the sintering behavior,microstructure,phase composition along with microwave dielectric performances for Li_(3)Mg_(2)Sb_(1-x)O_(6) ceramics were studied.Combined with X-ray diffraction(XRD)and Raman spectra,it was confirmed that phase composition could not be affected by the Sb nonstoichiometry and almost pure phase Li_(3)Mg_(2)SbO_(6) was formed in all compositions.Appropriate Sb-deficiency in Li_(3)Mg_(2)SbO_(6) not only lowered its sintering temperature but also remarkably improved its Q×f value.In particular,non-stoichiometric Li_(3)Mg_(2)Sb_(0.9)O_(6) ceramics sintered at 1250℃/5 h owned seldom low dielectric constant ε_(r)=10.8,near-zero resonant frequency temperature coefficient τ_(f)=-8.0 ppm/℃,and high quality factor Q×f=86,300 GHz(at 10.4 GHz).This study provides an alternative approach to ameliorate its dielectric performances for Li_(3)Mg_(2)SbO_(6)-based compounds through defect-engineering.

关 键 词：microwave dielectric properties CERAMICS SINTERING antimony compounds 

分 类 号：TQ174.1[化学工程—陶瓷工业]