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A lanthanum-tantalum (Al) oxide porous glass ceramic

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Abstract

The substitution of the end-member oxides in the ternary glass forming sodium borosilicate system was studied. The replacement of SiO2 with combinations of La2O3 and Ta2O52 was found to produce glasses which, after heat treatment decomposed to form a leachable sodium borate phase and an insoluble ceramic phase. The mode of phase decomposition is sensitive to impurities: the importance of crucible selection, e.g. Al2O3 or Pt/Rh is demonstrated by resulting differences in pore size, surface area, chemical resistance and structure of the insoluble phase for a series of La2O3-Ta2O5 and La2O3-Ta2O3-Al2O3 glass ceramic. These new materials have a specific surface area of up to 145 m2 g−1 and average pore radii ranging between 0.7 and 28.6 nm and show a varying degree of chemical resistance.

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Authors and Affiliations

  1. National Physical Research Laboratory, Council for Scientific and Industrial Research, Pretoria, Republic of South Africa

    R. W. White, M. A. Res & J. Bednarik

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  1. R. W. White
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  2. M. A. Res
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  3. J. Bednarik
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White, R.W., Res, M.A. & Bednarik, J. A lanthanum-tantalum (Al) oxide porous glass ceramic. J Mater Sci 18, 1021–1027 (1983). https://doi.org/10.1007/BF00551969

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  • DOI: https://doi.org/10.1007/BF00551969

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