MgO-TiO_2-CaO-SiO_2低介微波介质陶瓷材料研究  

Study on MgO-TiO_2-CaO-SiO_2 microwave dielectric ceramics with low permittivity

作　　者：焦向全[1] 钟朝位[1] 张树人[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《电子元件与材料》2010年第2期24-27,共4页Electronic Components And Materials

基　　金：国防基础科研基金资助项目

摘　　要：采用固相反应法,在0.92MgTiO3-0.08CaTiO3配比的基础上,制备了不同Mg2SiO4添加量的MgO-TiO2-CaO-SiO2复合陶瓷体系,研究了Mg2SiO4添加量对其物相结构、微观形貌及微波介电性能的影响。结果表明,体系中不存在杂相,其致密化烧结温度随Mg2SiO4添加量的增加而提高,添加适量Mg2SiO4能够降低体系的εr和谐振频率温度系数τf。当添加质量分数为35%的Mg2SiO4,体系在1360℃烧结2h可获得优异的微波介电性能:εr=15.5,Q·f=42640GHz(6GHz),τf=–13×10–6/℃。MgO-TiO2-CaO-SiO2 composite ceramic system with different Mg2SiO4 addition amounts were prepared from the raw materials consisting of 92% （mole fraction） MgTiO3 and 8% （mole fraction） CaTiO3 by the solid-state reaction method. The effects of Mg2SiO4 addition amount on the phase structure, micromorphology and microwave dielectric properties of the system were studied. The results show that there is no secondary phase in the system and the sintering temperature increases with the increasing of Mg2SiO4 addition amount. The relative permittivity（εr） and the temperature coefficient of resonant frequency （τf） of the system are reduced with appropriate addition of Mg2SiO4. With the addition of 35% Mg2SiO4 （mass fraction）, the system sintered at 1 360 ℃ for 2 h show excellent microwave dielectric properties, and their εr, Q·f value and τf are 15.5, 42 640 GHz （at 6 GHz） and – 13×10–6/ ℃,respectively.

关 键 词：微波介质陶瓷 介电性能 偏钛酸镁(MgTiO3) 主晶相 致密化烧结 

分 类 号：TQ174[化学工程—陶瓷工业]