Sol-gel processing of beta -eucryptite: An super(27)Al nuclear magnetic resonance investigation in sol stage

Preparation of beta -eucryptite by the sol-gel process from aluminum nitrate and aluminum-sec-butoxide was investigated. Preparation of beta -eucryptite from aluminum nitrate, TEOS and LiOH resulted to the formation of beta -eucryptite as the major crystalline phase along with a small amount of mino...

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Published in:Materials chemistry and physics 2003-02, Vol.78 (1), p.81-87
Main Authors: Mehraban, Z, Sabounchei, S J S, Amini, M Mohammadpour
Format: Article
Language:English
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Summary:Preparation of beta -eucryptite by the sol-gel process from aluminum nitrate and aluminum-sec-butoxide was investigated. Preparation of beta -eucryptite from aluminum nitrate, TEOS and LiOH resulted to the formation of beta -eucryptite as the major crystalline phase along with a small amount of minor phase(s). Single-phase beta -eucryptite was prepared from aluminum-sec-butoxide, TEOS and LiOEt with the aid of Hacac in 2-methoxyethanol and characterized by XRD and TGA /DSC. The coordination states of aluminum atoms after reaction of aluminum-sec-butoxide with other reactants in the preparation of beta -eucryptite were determined by super(27)Al NMR. The super(27)Al NMR indicated that before gelation, all aluminum atoms are in the six-coordinated states and infrared (IR) spectroscopy showed that the SiOAl bond forms after gelation which is important for preparation of single-phase beta -eucryptite by the sol-gel method. copyright 2002 Elsevier Science B.V. All rights reserved.
ISSN:0254-0584