Synthesis and Annealing Effects on the Structure of Alumina by Polyol Mediated Process

M.A. Flores González; Maricela Villanueva-Ibáñez; M.A. Hernández-Pérez

doi:10.4028/www.scientific.net/MSF.691.44

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HomeMaterials Science ForumMaterials Science Forum Vol. 691Synthesis and Annealing Effects on the Structure...

Synthesis and Annealing Effects on the Structure of Alumina by Polyol Mediated Process

Abstract:

Rare-earth ion (Eu³⁺ and Tb³⁺)-doped and undoped aluminum oxide powders have been prepared via polyol mediated synthesis. The precursors were aluminium nitrate, rare-earth (RE: Tb, Eu) nitrate and diethylene glycol. The powders were generated using low-temperature (T_max ~ 200°C) and reaction time of 150 min. By controlling the acidity of the synthesis solution and the precursor concentration, sub-micrometric aggregates (about 300 nm) with spherical morphology were obtained. The powders of RE-doped Al₂O₃ were further investigated by photon correlation laser, X-ray diffraction, transmission electron microscope, scanning electron microscope, thermal analysis and photoluminescence emission spectra. The results showed that a-Al₂O₃ is formed at a temperature significantly lower than the solid sate reaction route. The luminescence of Al₂O₃ doped with 5 at.% Eu was observed with emission band in 614 nm and Al₂O₃ doped with 5 at.% Tb showed an emission band in 544 nm.

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Materials Science Forum (Volume 691)

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44-48

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https://doi.org/10.4028/www.scientific.net/MSF.691.44

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June 2011

Authors:

M.A. Flores González, Maricela Villanueva-Ibáñez, M.A. Hernández-Pérez

Keywords:

Alumina, Nanopowder, Polyol Method, Rare-Hearth Ions

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