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Tetragonal Mullite-like Phase from Co-precipitated Gels

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Abstract

MUCH attention has been paid to the process of formation of mullite, a refractory mineral of the composition 3Al2O3.2SiO2, through decomposition of Al–Si clay minerals and crystallization of amorphous gels. In the course of my work on allophanes and related minerals1, a new tetragonal phase was encountered by heating the co-precipitated Al2O3–SiO2 gels at the temperature-range 910°–l,100° C.

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References

  1. Ossaka, J., Advances in Clay Science, Proc. Second Ann. Meeting on Clay and Clay Minerals, 337 (1960).

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  2. Demeduk, T., and Cole, W. F., Nature, 181, 1400 (1958).

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  3. Scholze, H., Ber. D.K.G., 32, 381 (1955).

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  1. Earthquake Research Institute, University of Tokyo,

    J. OSSAKA

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  1. J. OSSAKA
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OSSAKA, J. Tetragonal Mullite-like Phase from Co-precipitated Gels. Nature 191, 1000–1001 (1961). https://doi.org/10.1038/1911000a0

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