Effect of nanoparticles agglomeration on electrical properties of La_{1鈭?span style='font-style: italic'>x}A_xMnO₃ (A聽=聽Sr, Ba) nanopowder and ceramic solid solutions

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• 作者：S.O. Solopan^a ; ^{solopan@ukr.net} ; O.I. V&rsquo ; yunov^a ; A.G. Belous^a ; T.I. Polek^b ; A.I. Tovstolytkin^b
• 关键词：Ceramics ; Nanostructures ; Chemical synthesis ; Sol&ndash ; gel growth ; Electrical properties
• 刊名：Solid State Sciences
• 出版年：2012
• 期刊代码：98_12932558
• 类别：ch
• 出版时间：April, 2012
• 卷：14
• 期：4
• 页码：501-505
• 文件大小：599 K

摘要

Peculiar features of the sol-gel synthesis of substituted manganites La_1鈭?em>xA_xMnO₃ (A聽=聽Sr, Ba) have been investigated. Variation of the gel pH during synthesis was shown to affect the aggregation of particles and their crystal structure. Electrical properties of nanopowder and ceramic La_1鈭?em>xA_xMnO₃ solid solutions were studied. Additional heat treatment was revealed to affect not only the resistivity, but also the character of its temperature dependence. It was shown that under the synthesis and heat treatment conditions used in the work, the La_1鈭?em>xBa_xMnO₃ solid solutions with x聽=聽0.15 have the lowest conductivity at 1200聽K, which allows using them as thick-film cathodes.