论文部分内容阅读
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 powders were synthesized by the polymer precursor method with EDTA as complexing agent and the preparation process and thermal decomposition mechanism of SmAlO3 were studied.The properties of the powders were characterized.The results showed that the addition of ethylene glycol The gel was completely decomposed completely above 550 ℃ and calcined at 800 ℃ for 2h to obtain single-phase SmAlO3 with an orthorhombic perovskite structure. The synthesis temperature dropped sharply from 1400 ℃ to 800 ℃ in the conventional solid-state reaction, Dispersibility is good, the average particle size is about 30nm.The synthetic powder can significantly improve the sintering properties of SmAlO3, SmAlO3 ceramics can be sintered compact at 1550 ℃, the relative density of 97.5%, and shows excellent microwave dielectric properties, relative dielectric A constant of 21, a figure of merit of 77400 GHz and a temperature coefficient of resonance frequency of -73.2 × 10 -6 ° C. -1.