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Type: Artigo de periódico
Title: Preparation and characterization of powders and thin films of Bi2AlNbO7 and Bi2InNbO7 pyrochlore oxides
Author: Teixeira, Z
Otubo, L
Gouveia, RF
Alves, OL
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.
Subject: Thin films
Atomic force microscopy (AFM)
Optical properties
Country: Suíça
Editor: Elsevier Science Sa
Citation: Materials Chemistry And Physics. Elsevier Science Sa, v. 124, n. 1, n. 552, n. 557, 2010.
Rights: fechado
Identifier DOI: 10.1016/j.matchemphys.2010.07.009
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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