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Sol-gel synthesis of a nanoparticulate aluminosilicate precursor for homogeneous mullite ceramics

Published online by Cambridge University Press:  01 May 2006

Jarkko Leivo ,
Mika Lindén ,
Cilâine V. Teixeira ,
Janne Puputti ,
Jessica Rosenholm ,
Erkki Levänen  and
Tapio A. Mäntylä
Jarkko Leivo*
Affiliation:
Institute of Materials Science, Tampere University of Technology, 33101 Tampere, Finland
Mika Lindén
Affiliation:
Department of Physical Chemistry, Åbo Akademi, 20500 Åbo, Finland
Cilâine V. Teixeira
Affiliation:
Department of Physical Chemistry, Åbo Akademi, 20500 Åbo, Finland
Janne Puputti
Affiliation:
Department of Physical Chemistry, Åbo Akademi, 20500 Åbo, Finland
Jessica Rosenholm
Affiliation:
Department of Physical Chemistry, Åbo Akademi, 20500 Åbo, Finland
Erkki Levänen
Affiliation:
Institute of Materials Science, Tampere University of Technology, 33101 Tampere, Finland
Tapio A. Mäntylä
Affiliation:
Institute of Materials Science, Tampere University of Technology, 33101 Tampere, Finland
*
a) Address all correspondence to this author. e-mail: jarkko.leivo@millidyne.fi
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Abstract

An amorphous nanoparticulate aluminosilicate 3/2-mullite precursor has been synthesized and carefully characterized. The sol contained 2-nm particles of Q3(3Al) silica species together with six-coordinated alumina, which suggested an allophane-like structure of the nanoparticles. The sol remained stable for years, and formed an easily redispersible physical gel upon solvent evaporation. The gel crystallized to mullite at temperatures below 1000 °C, without going through any intermediate spinel phase. Thus, the nanoparticulate precursor is regarded as a homogeneous high-purity mullite precursor with a high Si–O–Al bond density, which is useful in the preparation of various nanostructured Al-rich aluminosilicate materials. The sols and gels were characterized by small-angle x-ray scattering, dynamic light scattering, x-ray diffraction, 27Al and 29Si magic-angle spinning (MAS) nuclear magnetic resonance spectroscopy, and differential thermal analysis.

Keywords

CeramicNanoparticleSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 5 , May 2006 , pp. 1279 - 1285
Copyright
Copyright © Materials Research Society 2006

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