Structural characterization of phase transition of Al2O3 nanopowders obtained by polymeric precursor method

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Cava, S.
Tebcherani, S. M.
Souza, I. A.
Pianaro, S. A.
Paskocimas, C. A.
Longo, Elson [UNESP]
Varela, José Arana [UNESP]

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Elsevier B.V.


Nanocrystalline Al(2)O(3)powders have been synthesized by the polymeric precursor method. A study of the evolution of crystalline phases of obtained powders was accomplished through X-ray diffraction, micro-Raman spectroscopy and refinement of the structures through the Rietveld method. The results obtained allow the identification of three steps on the gamma-Al2O3 to alpha-Al2O3 phase transition. The single-phase alpha-Al2O3 Powder was obtained after heat-treatment at 1050 degrees C for 2 h. A study of the morphology of the particles was accomplished through measures of crystallite size, specific surface area and transmission electronic microscopy. The particle size is closely related to gamma-Al2O3 to alpha-Al2O3 phase transition. (c) 2007 Elsevier B.V. All rights reserved.



Al2O3, phase transition, polymeric precursor method, nanopowders, micro-Raman spectroscopy, crystallite size

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Materials Chemistry and Physics. Lausanne: Elsevier B.V. Sa, v. 103, n. 2-3, p. 394-399, 2007.