Study on extraordinary transport behaviors of polycrystalline La-Sb-Mn-O ceramic - 文章详情页

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The　transport　properties　of　polycrystalline　La0.9Sb0.1MnO3　(LSMO)　bulk　prepared　by　the　solid-state　reaction　were　investigated.　We　find　that　transport　behaviors　heavily　depend　on　the　synthesis　process.　The　resistivity　of　LSMO1　for　less　rubbing　time　shows　one　metal-insulator　transition　(MIT)　peak　at　temperature　of　201　K,　while　the　resistivity　of　LSMO2　for　more　rubbing　time　shows　a　MIT　and　a　shoulder　at　about　240　and　140　K,　respectively.　The　magnetoresistance　(MR)　ratio　of　LSMO2　reaches　41%　under　magnetic　field　of　2　T.　Moreover,　the　MR　ratio　keeps　significant　value　within　broad　temperature　range.　The　infrared　(IR)　absorption　spectra　of　LSMO2　show　that　the　stretch-mode　peak　split　into　two　Gaussian　peaks　with　the　gap　about　70　cm-1.　This　large　splitting　indicates　there　are　strong　distortion　and　disorder　in　LSMO2　sample.　The　results　are　interpreted　in　terms　of　the　disorder　system　and　phase　separation　in　perovskite　manganites.　©　(2013)　Trans　Tech　Publications,　Switzerland.

关键词：

Ceramic materials Colossal magnetoresistance Electron transport properties Manganese oxide Metallurgical engineering Phase separation Semiconductor insulator boundaries Solid state reactions Transport properties

作者机构：

[ 1 ] [Duan, P.]College of Applied Science, Beijing University of Technology, Beijing, China
[ 2 ] [Duan, W.J.]College of Applied Science, Beijing University of Technology, Beijing, China
[ 3 ] [Wang, J.Y.]College of Applied Science, Beijing University of Technology, Beijing, China
[ 4 ] [Wang, Q.]College of Applied Science, Beijing University of Technology, Beijing, China
[ 5 ] [Chang, L.]College of Materials Science and Engineering, Beijing University of Technology, Beijing, China
[ 6 ] [Kong, L.]College of Applied Science, Beijing University of Technology, Beijing, China

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