摘要
以EDTA为络合剂,采用聚合物前驱体法合成了SmAlO3微波介质陶瓷粉体,并研究了SmAlO3的制备过程、热分解机理,表征了粉体性质.结果表明,添加乙二醇制备的干凝胶在550℃以上基本分解完全,800℃煅烧2h获得正交钙钛矿结构的SmAlO3单相,合成温度从传统固相反应法的1400℃大幅下降到800℃,所得粉体颗粒呈球形,分散性良好,平均粒径约30nm.合成粉体可显著提高SmAlO3的烧结性能,SmAlO3陶瓷在1550℃即可烧结致密,相对密度达97.5%,并显示出优良的微波介电性能,相对介电常数为21,品质因数为77400GHz,谐振频率温度系数为-73.2×10-6℃-1.
SmAlO3 microwave dielectric ceramic powder was successfully synthesized by the polymeric precursor method using EDTA as a chelating agent.The polymeric decomposition mechanism of the precursor,the formation process of SmAlO3 and the properties of the particles were characterized.The results show that the dried gel including EG addition is decomposed completely up to 550℃ and single SmAlO3 phase with orthorhombic perovskite structure is found when the calcining temperature is increased to 800℃.Compared with the conventional solid-state reaction route,the synthesis temperature is sharply decreased from 1400 to 800℃.With the average particle size of about 30 nm,the particles of the as-synthesized powder are uniform and spherical.Using the as-synthesized powder as raw material,the sample sintered at 1550℃ for 2 h possesses the highest relative density of 97.5% and exhibits excellent microwave dielectric properties of relative permittivity er=21,quality factor Qf=77400 GHz and temperature coefficient of resonant frequency τf=-73.2＇10-6 ℃-1.
出处
《过程工程学报》
CAS
CSCD
北大核心
2011年第5期851-856,共6页
The Chinese Journal of Process Engineering
关键词
SmAlO3
聚合物前驱体法
乙二胺四乙酸
乙二醇
烧结性
微波介电性能
SmAlO3
polymeric precursor method
ethylenediaminetetraacetic acid
ethylene glycol
sinterability
microwave dielectric property
