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Role of MnO on the Mullitization Behavior of Al2 O3-SiO2 Gels

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Abstract

Gels were synthesized from solutions of tetraethylorthosilicate (TEOS) and aluminium nitrate (with and without manganese nitrate).

The structural evolution of the gels as a function of manganese content and heat-treatment temperature was studied by visible spectrophotometry (VIS), electron paramagnetic resonance (EPR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the presence of manganese can induce mullitization at lower temperatures. However, the effect of manganese depends on its content and how it enters into the mullite structure.

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Authors and Affiliations

  1. Departamento de Engenharia Cerâmica e do Vidro, Universidade de Aveiro, 3800, Aveiro, Portugal

    M.G. Ferreira Da Silva

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  1. M.G. Ferreira Da Silva
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Da Silva, M.F. Role of MnO on the Mullitization Behavior of Al2 O3-SiO2 Gels. Journal of Sol-Gel Science and Technology 13, 987–990 (1998). https://doi.org/10.1023/A:1008652129890

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  • DOI: https://doi.org/10.1023/A:1008652129890

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