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|Type:||Artigo de periódico|
|Title:||Preparation and characterization of powders and thin films of Bi2AlNbO7 and Bi2InNbO7 pyrochlore oxides|
|Abstract:||Powders and thin films of Bi2InNbO7 and Bi(2)AINbO(7) with pyrochlore-type structures were prepared by metalorganic decomposition processes (MOD). The structural evolution of the powders was characterized by X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS). The powders were obtained at lower temperatures and faster than with conventional solid-state reactions. The films were further characterized by ultraviolet-visible-near-infrared (UV-vis-NIR) absorbance spectroscopy and atomic force microscopy (AFM). A pyrochlore-type phase in the films was obtained at even lower temperatures than the powders. These presented high transmittances in the vis-NIR range, uniform thicknesses and low roughnesses. A blue shift in the optical gap was observed as the thickness decreased. This was mainly attributed to the Brus effect, since the films showed the presence of nano-sized clusters. The film properties make them very interesting for technological applications such as in photocatalytic processes. (C) 2010 Elsevier B.V. All rights reserved.|
Atomic force microscopy (AFM)
|Editor:||Elsevier Science Sa|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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