纳米复合La9.33Si6O26/Ce0.85Bi0.15O1.925氧离子导电体的制备及其导电性能

来源期刊:中南大学学报(自然科学版)2009年第5期

论文作者:周海涛 张鸿 李志成

文章页码:1265 - 1269

关键词:La9.33Si6O26陶瓷;氧离子导电体;纳米复合材料;导电性;合成;

Key words:La9.33Si6O26 ceramic; oxygen ionic conductor; nano-composite; conductivity; synthesis

摘    要:将以聚乙烯醇为聚合剂的空间俘获合成法与共沉淀法相结合制备85% La9.33Si6O26-15% Ce0.85Bi0.15O1.925纳米复合氧离子导电体。通过X射线衍射方法分析试样的相组成和晶粒尺寸,利用交流阻抗测试研究材料的氧离子导电性。研究结果表明:所用合成方法能制备La9.33Si6O26 和Ce0.85Bi0.15O1.925两相共存的纳米复合材料,纳米复合粉体的平均晶粒尺寸为35 nm,纳米复合烧结块体材料的平均晶粒尺寸为70 nm;通过纳米复合技术能显著提高材料的氧离子导电性;在600 ℃时,纳米复合材料的氧离子导电性比纯La9.33Si6O26的导电性提高2个以上数量级。

Abstract: 85% La9.33Si6O26-15% Ce0.85Bi0.15O1.925 nano-composite oxygen-ionic conductors were fabricated by combining with the steric-entrapment-synthesis method polymerized by polyvinyl alcohol and the co-precipitation process. The phase component and grain size of the prepared samples were analyzed by X-ray diffractrometry, and the oxide-ionic conductivities were measured by AC impedance measurement. The results show that the nano-composite materials compose of La9.33Si6O26 and Ce0.85Bi0.15O1.925 were successfully obtained, the average grain size of the as-calcined powder is 35 nm and the one of as-sintered bulk is 70 nm. The oxide-ionic conductivity is enhanced obviously by nanocomposite technology. The conductivities of nanocomposite increase by two orders in magnitude compared to that of the pure La9.33Si6O26 ceramic at 600 ℃.

基金信息:教育部留学回国人员科研启动基金资助项目
高校博士点专项科研基金资助项目

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 主办 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(湘)字第028号   湘ICP备09001153号