Ca_(3)MgSi_(2)O_(8)陶瓷:烧结行为、晶格振动和介电性能研究  

Ca_(3)MgSi_(2)O_(8) ceramics:sintering behaviour,lattice vibration,and dielectric properties

作　　者：邓炼 杨清岚 何颖晗 韦小利 韦孝鹏 张海林 周焕福[1] DENG Lian;YANG Qinglan;HE Yinghan;WEI Xiaoli;WEI Xiaopeng;ZHANG Hailin;ZHOU Huanfu(College of Material Science and Engineering,Guilin University of Technology,Guilin 541004,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

出　　处：《功能材料》2023年第7期7131-7138,7144,共9页Journal of Functional Materials

基　　金：国家自然科学基金项目(61761015,11664008);广西自然科学基金项目(2017GXNSFFA198011,2018GXNSFFA050001,2017GXNSFDA198027)。

摘　　要：采用传统的固态反应法制备了单斜晶系的Ca_(3)MgSi_(2)O_(8)(CMSO)陶瓷。XRD表明1350~1425℃烧结的CMSO均为单相结构(空间群:P21/a)。SEM发现,当烧结温度为1400℃时,CMSO陶瓷具有最佳的表面形貌和优异的微波介电性能:εr=13.62,Q×f=42292 GHz,τf=-48.36×10^(-6)/℃。讨论了CMSO陶瓷的Q×f值与填充分数和共价键的关系。通过拉曼光谱研究了晶格振动对CMSO内部介电损耗的影响,计算出MgO_(6)八面体畸变,从而解释了τf变化的内在机制。综上所述,CMSO陶瓷在移动通信基站、卫星导航和雷达通信领域具有良好的应用前景。The monoclinic Ca_(3)MgSi_(2)O_(8)(CMSO)ceramics were prepared by the traditional solid-state reaction method.XRD showed that CMSO sintered at 1350-1425℃were all single-phase structures with space group of P21/a,and SEM found that when the sintering temperature was 1400℃,CMSO ceramics had the best surface topography and excellent microwave dielectric properties:εr=13.62,Q×f=42292 GHz,τf=-48.36×10^(-6)/℃.The relationship between Q×f values and fill fractions and covalent bonds of CMSO ceramics was discussed.The influence of lattice vibration on the internal dielectric loss of CMSO was studied by Raman spectroscopy,and the octahedral distortion of MgO_(6) was calculated,which explained the internal mechanism ofτf change.In summary,CMSO ceramics have good application prospects in the fields of mobile communication base stations,satellite navigation and radar communications.

关 键 词：低介电常数 Ca_(3)MgSi_(2)O_(8) 填充分数 微波介电性能 共价键强度 

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