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|Type:||Capítulo de livro|
|Title:||Growth, Characterization And Magnetic Properties Of Polycrystalline Fibers Of Electron Doped Manganites|
De Lima O.F.
|Abstract:||In this Chapter we review some of our latest results regarding the growth, characterization and magnetic properties of bulk samples (composite fibers) of the optimally doped La1-xCexMnO3 manganites by using the Laser Heated Pedestal Growth technique. It has been widely recognized that, in comparison with the hole doped manganite (like, e.g., La1-xCaxMnO3), its electron doped counterpart La1-xCexMnO3 is a metastable phase. That is why, before optimizing the growth conditions, we were able to grow polycrystalline multiphase fibers. Their composition and granularity were verified through Scanning Electron Microcopy with Energy Dispersive X-ray analysis. The magnetic behavior of the fibers was probed by AC susceptibility and magnetization measurements as a function of temperature. Several ferromagnetic transitions were identified. In addition to a weak transition at TC0=45K (due to MnO2 impurities), three more transitions with Curie temperatures TC1=126K, TC2=180K, and TC,max=300K were observed and linked to fiber regions with cerium concentration of x=0.063, x=0.13, and x=0.3,respectively. © 2013 by Nova Science Publishers, Inc. All rights reserved.|
|Editor:||Nova Science Publishers, Inc.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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