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.
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Leivo, J., Lindén, M., Teixeira, C.V. et al. Sol-gel synthesis of a nanoparticulate aluminosilicate precursor for homogeneous mullite ceramics. Journal of Materials Research 21, 1279–1285 (2006). https://doi.org/10.1557/jmr.2006.0152
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DOI: https://doi.org/10.1557/jmr.2006.0152