溶胶-凝胶法制备La_(0.8)Sr_(0.2)CoO_3纳米材料  

Preparation of La_(0.8)Sr_(0.2)CoO_3 Nanometer Powders by Sol-Gel Method

作　　者：吴印林[1] 王岭[2] 李福燊[1] 赵海燕[3] 赵艳琴[2] 赵英娜[3] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]河北理工大学化工与生物技术学院,河北唐山063009 [3]河北理工大学材料学院,河北唐山063009

出　　处：《中国稀土学报》2007年第6期751-754,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然基金资助项目(50572024);国家教育部归国人员基金;唐山市科技局资助项目(04364001B-10)

摘　　要：以La(NO3)3.6H2O,Sr(NO3)2,Co(NO3)2.6H2O为原料,用EDTA作为胶溶剂,采用溶胶-凝胶法制备La0.8Sr0.2CoO3纳米粉体。利用TG-DTA,FT-IR,XRD,TEM等技术手段对凝胶制备过程、热分解机制、粉体形貌进行了研究,并探讨了最佳的煅烧温度。研究结果表明,溶胶-凝胶法可以制得均一钙钛矿结构的La0.8Sr0.2CoO3氧化物,最佳热处理温度为700℃,粒径约为20 nm。Using La（NO3）3·6H2O, Sr（NO3）2, and Co （NO3）2·6H2Oas raw materials, the LaosSr0.2 CoO3 nanometer powders were prepared by EDTA sol-gel. Gel was calcined at 700, 800 and 900 ℃ respectively. The samples were characterized by DTA, FT-IR, XRD, TEM techniques. The preparation process, themechanism of thermal decomposition, morphology of synthesized powders and the optimal heat-treatment temperature were studied. The results shown that the spheric nanocrystalline La0.8Sr0.2CoO3 can be obtained and the optimal heat-treatment temperature was 700 ℃. The particle size was about 20 nm.

关 键 词：La0.8Sr0.2CoO3纳米粉体 EDTA 溶胶-凝胶法 稀土 

分 类 号：TB383[一般工业技术—材料科学与工程] TP212.2[自动化与计算机技术—检测技术与自动化装置]