低介电常数LaYSi_(2)O_(7)陶瓷的结构与微波性能研究  

Microwave performances and structure of low permittivity LaYSi_(2)O_(7) ceramic

作　　者：何颖晗 何国强 刘彦君 李青 戴正立 张海林 周焕福[1] HE Yinghan;HE Guoqiang;LIU Yanjun;LI Qing;DAI Zhengli;ZHANG Hailin;ZHOU Huanfu(College of Material Science and Engineering,Guilin University of Technology,Guilin 541004,Guangxi Zhuang Autonomous Region,China;Guiyang Shunluo Xunda Electronics Co.,Ltd.,Guiyang 550014,China)

机构地区：[1]桂林理工大学材料科学与工程学院,广西桂林541004 [2]贵阳顺络迅达电子有限公司,贵州贵阳550014

出　　处：《电子元件与材料》2023年第1期13-19,共7页Electronic Components And Materials

基　　金：国家自然科学基金(61761015,11664008);广西自然科学基金(2017GXNSFFA198011,2018GXNSFFA050001,2017GXNSFDA198027);贵州省科技计划项目(黔科合成果[2021]一般123)。

摘　　要：采用固相反应法制备了一种新型低介电常数LaYSi_(2)O_(7)(LYSO)微波介电陶瓷。1300~1450℃烧结的LYSO陶瓷为单斜晶系结构(空间群:P2_(1)/a)。当烧结温度为1450℃时,陶瓷的相对密度达到最大值(93.40%),这与介电常数变化趋势一致。陶瓷的Q×f值与其填充分数密切相关。1400℃烧结的LYSO陶瓷具有最高的填充分数(55.84%)和最佳的微波介电性能:ε_(r)=8.98,Q×f=17411 GHz,τ_(f)=-70.77×10^(-6)/℃。通过结构参数量化了LYSO的晶格畸变,从而揭示了τ_(f)与结构的内在关系。LYSO陶瓷具有良好的微波介电性能,表明该类材料在移动通信基站领域具有良好的应用前景。A novel low permittivity LaYSi_(2)O_(7)(LYSO) microwave dielectric ceramic was prepared by a solid-phase reaction method. The LYSO ceramic sintered at 1300-1450 ℃ exhibits the monoclinic crystalline structure(space group: P2_(1)/a). As the sintering temperature is 1450 ℃, the relative density of ceramic reaches the maximum value(93.40%), which is consistent with the variation of the dielectric permittivity. The Q×f is closely related to its packing fraction. The packing fraction of LYSO ceramic sintered at 1400 ℃ reaches the maximum value of 55.84%, and it has the best microwave dielectric properties of ε_(r)= 8.98, Q×f= 17411 GHz and τ_(f)=-70.77×10^(-6)/℃. The lattice distortion of LYSO ceramic is quantified by the structural parameters, which reveals the relationship between τ_(f)and structure. The LYSO ceramic exhibits good microwave dielectric properties, showing that it has good application prospects in mobile communication base stations.

关 键 词：微波介质陶瓷 LaYSi_(2)O_(7)陶瓷 低介电常数 晶格畸变 

分 类 号：TQ174.1[化学工程—陶瓷工业] TB34[化学工程—硅酸盐工业]