用柠檬酸溶胶凝胶法合成SrFeCo_(0.5)O_x氧化物  

Synthesis of Complex Conducting Oxides SrFeSrFeCo_(0.5)O_x by Citrates Sol-gel Method

作　　者：霍地[1] 张劲松[2] 杨洪才[1] 曹小明[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]中国科学院金属研究所,辽宁沈阳110014

出　　处：《东北大学学报（自然科学版）》2003年第1期61-63,共3页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究发展规划'九七三'项目(G20000672001).

摘　　要：采用柠檬酸溶胶凝胶法合成SrFeCo0 5Ox混合导体氧化物·利用XRD、TEM以及DTA方法研究与分析了不同条件下样品的晶体结构组成、相貌·确定了最佳制备条件·结果说明在燃料剂/氧化剂比例为0 64,550℃时得到单相钙钛矿氧化物,氧化物为纳米球形颗粒,尺寸分布均匀;加热温度升高850℃晶体结构无变化,颗粒尺寸明显长大但是形状不变·同时分析了溶胶凝胶反应过程及影响因素·Conducting oxides SrFeCo0.5Ox powder was prepared by nitrate solgel method. Thermal reaction of the gel during heating is investigated by DTA and the crystal structure and morphology of the calcined powder were characterized by xray diffraction (XRD) and transmission electron microscope (TEM) respectively. The results show that single perovskite oxide can be formed at 550?℃ with x=064. The oxide size particle is in nanometer grade and very uniform. As the calcined temperature increases up to 850?℃,the phase of the sample still does not change but the particles size becomes 100?nm. The polymerization reaction of nitrates solgel is also discussed.

关 键 词：柠檬酸溶胶凝胶法 无机合成 混合导体氧化物 SrFeCo0.5Ox 晶体结构 制备条件 锶 铁钴氧化物 

分 类 号：O614.232[理学—无机化学] O611.4[理学—化学]