低介电损耗Ca_(1-x)Sr_(x)MgSi_(2)O_(6)微波介质陶瓷的结构和介电性能  

Structure and Dielectric Properties of Ca_(1-x)Sr_(x)MgSi_(2)O_(6)Microwave DielectricCeramics with Low Dielectric Loss

作　　者：章国涛 高艳 刘书利 孟德喜 高娜燕 郑勇[2] ZHANG Guotao;GAO Yan;LIU Shuli;MENG Dexi;GAO Nayan;ZHENG Yong(China Key System&Integrated Circuit Co.,Ltd.,Wuxi 214072,Jiangsu,China;College of Material Science&Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]中科芯集成电路股份有限公司,江苏无锡214072 [2]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《材料导报》2023年第4期68-72,共5页Materials Reports

基　　金：国家自然科学基金(51674148)。

摘　　要：本工作研究了Sr^(2+)取代Ca^(2+)对Ca_(1-x)Sr_(x)MgSi_(2)O_(6)陶瓷烧结特性、物相组成、显微组织和微波介电性能的影响。结果表明:采用Sr^(2+)取代部分Ca^(2+)时可以降低陶瓷的烧结温度,并且提高陶瓷的致密度。当Sr^(2+)取代量小于等于0.5时,陶瓷烧结体中只存在单一的CaMgSi_(2)O_(6)相。随着Sr^(2+)取代量的增加,Ca_(1-x)Sr_(x)MgSi_(2)O_(6)陶瓷的介电常数和品质因数均先增大后减小,而谐振频率温度系数逐渐增大。当Sr^(2+)取代量为0.4时,Ca_(0.6)Sr_(0.4)MgSi_(2)O_(6)陶瓷在1225℃下烧结4 h具有较佳的综合微波介电性能:ε_(r)=7.480,Q×f=78920 GHz,τ_(f)=-41.50×10^(-6)/℃。The influence of the substitution of Sr^(2+)for Ca^(2+)on the sintering characteristics,phase composition,microstructure and microwave dielectric properties of Ca_(1-x)Sr_(x)MgSi_(2)O_(6) ceramics was investigated.The results showed that the substitution of Sr^(2+)can lower the sintering temperature and improve the density of ceramics.When the Sr^(2+)substitution amount was less than or equal to 0.5,only a single CaMgSi_(2)O_(6)phase existed in the ceramics.With the increase of Sr^(2+)content,the dielectric constant and quality factor of Ca_(1-x)Sr_(x)MgSi_(2)O_(6)ceramics both increased first and then decreased,while the temperature coefficient of resonance frequency gradually increased.Ca 0.6 Sr_(0.4)MgSi_(2)O_(6)ceramics sintered at 1225℃for 4 h showed superior comprehensive microwave dielectric properties:ε_(r)=7.480,Q×f=78920 GHz,τ_(f)=-41.50×10^(-6)/℃.

关 键 词：微波介质陶瓷 CaMgSi_(2)O_(6) 离子取代 介电性能 

分 类 号：TQ174[化学工程—陶瓷工业]