摘要：用柠檬酸(C₆H₈O₇)为络合剂,以硝酸钐(Sm(NO₃)₃)、钛酸四丁酯(C₁₆H₃₆O₄Ti)、硝酸钡(Ba(NO₃)₂)为原料,采用溶胶-凝胶法制备单相Ba_3.99Sm_9.34Ti₁₈O₅₄微波介质陶瓷粉体。采用差热分析、X射线衍射表征Ba_3.99Sm_9.34Ti₁₈O₅₄前驱体的热行为和晶型转化过程,用场发射扫描电镜对粉体的形貌进行表征。结果表明:在1000℃下保温3h可以获得纯Ba_3.99Sm_9.34Ti₁₈O₅₄陶瓷粉体,形状为不规则片状,平均粒径为100200nm。

关键词：溶胶-凝胶法；微波介质陶瓷；粉体

Abstract：Ba_3.99Sm_9.34Ti₁₈O₅₄ microwave dielectric ceramic powder was prepared by sol-gel method with citric acid （C₆H₈O₇） as chelating agent and using samaric nitrate (Sm(NO₃)₃)， tetrabutyl titanate（C₁₆H₃₆O₄Ti）， barium nitrate （Ba （NO₃)₂）as raw materials. The differential scanning calorimeter and thermo-gravimetric （DSC-TG） and X-ray differaction （XRD） were used to investigate the thermal behavior of Ba_3.99Sm_9.34Ti₁₈O₅₄ precursor and evaluate its phase formation. Field emission scanning electron microscope （FESEM） was employed to observe the morphology of theBa_3.99Sm_9.34Ti₁₈O₅₄ powder. When Ba_3.99Sm_9.34Ti₁₈O₅₄ precursor was calcined at 1 000 ℃ for 3 h， pure Ba_3.99Sm_9.34Ti₁₈O₅₄ phase was prepared with irregular flake shape and mean partile size of 100~200 nm.

Keywords：sol-gel； microwave dielectric ceramics； powder