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

被引：229

作者：

Cava, S.

Tebcherani, S. M.

Souza, I. A.

Pianaro, S. A.

Paskocimas, C. A.

Longo, E.

Varela, J. A.

机构：

[1] Univ Estadual De Ponta Grossa, Lab Interdisciplinar Mat Ceram, Ctr Interdisciplinar Pesquisa & Posgraduacao, BR-84035900 Ponta Grossa, PR, Brazil

[2] Univ Estadual Paulista, Lab Interdisciplinar Ceram, Dept Quim Fis, Inst Quim, Araraquara, SP, Brazil

[3] Univ Fed Rio Grande do Norte, Dept Eng Mecan, BR-59072970 Natal, RN, Brazil

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2007年 / 103卷 / 2-3期

基金：

巴西圣保罗研究基金会;

关键词：

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

D O I：

10.1016/j.matchemphys.2007.02.046

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：394 / 399

页数：6

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