La0.6Sr0.4Co1-yFeyO3(y=0.2,0.8)复合氧化物混合导电性能研究

中国稀土学报, 2006, 24(4): 503-506.

La0.6Sr0.4Co1-yFeyO3(y=0.2,0.8)复合氧化物混合导电性能研究

黄端平 ^1, , 徐庆 ^2, , 陈文 ^3, , 张枫 ^4, , 汪碧涛 ^5,

1.武汉理工大学材料科学与工程学院,湖北,武汉,430070

2.武汉理工大学材料科学与工程学院,湖北,武汉,430070

3.武汉理工大学材料科学与工程学院,湖北,武汉,430070

4.武汉理工大学材料科学与工程学院,湖北,武汉,430070

5.武汉理工大学材料科学与工程学院,湖北,武汉,430070

基金项目: 国家自然科学基金(50572079) 教育部跨世纪优秀人才培养计划(NECT-04-0724) 高等学校博士学科点专项科研项目(20030497008)

关键词： La0.6Sr0.4Co1-yFeyO3 , 复合氧化物 , 电子电导率 , 离子电导率

Mixed Electronic-Ionic Conducting Properties of La0.6Sr0.4Co1-yFeyO3(y=0.2,0.8) Perovskite-Type Oxides

采用甘氨酸-硝酸盐(GNP)法制备了La0.6Sr0.4Co1-yFeyO3(y=0.2,0.8)复合氧化物,研究了材料的结构、电子-离子混合导电性能及其相关性.结果表明,La0.6Sr0.4Co1-yFeyO3(y=0.2,0.8)合成粉料的颗粒细小均匀(～100 nm),陶瓷形成菱形六面体钙钛矿结构.与La0.6Sr0.4Co0.2Fe0.8O3(y=0.8)陶瓷相比,La0.6Sr0.4Co0.8Fe0.2O3(y=0.2)陶瓷的晶粒尺寸大、致密度较高.在La0.6Sr0.4Co0.8Fe0.2O3(y=0.2)陶瓷中观察到Co3+离子歧化对电子导电性能的影响.与La0.6Sr0.4Co0.2Fe0.8O3(y=0.8)陶瓷相比,La0.6Sr0.4Co0.8Fe0.2O3(y=0.2)陶瓷具有更优异的电子-离子混合导电性能,材料在混合导电性能上的差异与其电子结构和显微结构紧密相关.

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