Comparative Roles of Al3+ and Fe3+ Ions for Network Construction in Sodium Silicate Melts.

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  • Mohri M.
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Sasaki Y.
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Ishii K.
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University

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Abstract

The Raman spectra of Na2O–Al2O3–SiO2 system with different Al2O3contents (up to 25 mol%) and with Na2O/SiO2ratio from 1 to2have been measured at 1 673 K.<br>In the disilicate systems, the Raman spectra do not change significantly with increasing of Al2O3 content except the development of the 500 cm-1 band which is assigned to the three-dimensional network structural unit consisted of Si4+ and Al3+ ions. Also it is found that Al3+ ions possibly interact with monomers and form three-dimensional structures.<br>In the metasilicate systems, intensities of 950 and 850 cm-1 bands gradually decrease while that of 1 100 cm-1 band increases with the increase of Al2O3 content. According to the following equilibrium reaction in the metasilicate composition, <br><br>-O–Si–O- (chain-like unit)↔Si–O 2-(monomer) + -O–Si–O0 (sheet-like unit)<br><br>it is confirmed that Al3 ions in the metasilicate systems do not interact with the polymerized silicate anions, such as chain-like or sheet-like structural units. On the other hand, it has a high tendency to interact with SiO44− and construct three-dimensional network units involving Al3+ and Si4+ ions randomly. So it is ob-viousthat the role of Al3+ ions for constructing the network structure is found to be quite different from that of Fe3+.

Journal

  • ISIJ International

    ISIJ International 41 (5), 410-415, 2001

    The Iron and Steel Institute of Japan

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