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.
作者
何颖晗
何国强
刘彦君
李青
戴正立
张海林
周焕福
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)
出处
《电子元件与材料》
CAS
北大核心
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)。
