Pr0.6-xNdxCa0.4FeO3-δ体系复合氧化物的Pechini法合成与表征

中国稀土学报, 2006, 24(3): 304-309.

Pr0.6-xNdxCa0.4FeO3-δ体系复合氧化物的Pechini法合成与表征

陈永红 ^1, , 储昭荣 ^2, , 魏亦军 ^3, , 刘杏芹 ^4, , 孟广耀 ^5,

1.淮南师范学院实验信息中心,安徽,淮南,232001;中国科学技术大学材料科学与工程系,安徽,合肥,230026

2.淮南师范学院实验信息中心,安徽,淮南,232001

3.淮南师范学院实验信息中心,安徽,淮南,232001

4.中国科学技术大学材料科学与工程系,安徽,合肥,230026

5.中国科学技术大学材料科学与工程系,安徽,合肥,230026

基金项目: 安徽省教育厅自然科学基金(2004kj326;2006kj132B)

关键词： Pechini法 , Pr0.6-xNdxCa0.4FeO3-δ , 钙钛矿 , 电导率 , 稀土

Synthesis and Characterization of Pr0.6-xNdxCa0.4FeO3-δ with Pechini Method

采用Pechini法合成了Pr0.6-xNdxCa0.4FeO3-8(x=0.0,0.2,0.3,0.4,0.5,0.6)系列复合氧化物粉体,用FT-IR,BET,XRD,TG-DTA,SEM等对产物形成过程及微结构进行了表征. 结果表明,所合成的系列产物平均粒径均小于100 nm,粉体烧结活性高,1200 ℃下烧结2 h样品的相对密度达到95%. 所有产物在900 ℃下煅烧2 h即形成正交钙钛矿结构的单相固溶体;A位双稀土元素的存在对产物的晶型无影响. 随着样品Pr/Nd比例的减小(x值增大),XRD衍射峰宽度有增大的趋势. 采用直流四端子法测量了烧结体在中温(450～800 ℃)区的电导率,A位双稀土样品的电导率优于单一稀土样品,Pr0.1Nd0.5Ca0.4FeO3-δ样品的电导率最高.

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