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- W1968608912 abstract "The gels of the binary system Na2OSiO2 are difficult to prepare under reproducible conditions because of the catalytic effect of the OH− ions. The gels were prepared in the whole range of composition which corresponds to the vitrification range. The structural analogy between the gels and the corresponding glasses was shown by X-ray diffraction and IR spectroscopy. The problems related to the preparation of these gels were studied, following their structural evolution during ageing. The action of atmospheric agents. (CO2 and H2O) induces a crystallization of carbonate compounds. The crystalline phase which appears is Na3H(CO3)2 2H2O in the case of gels containing less than 25 mol% Na2O. For a higher sodium content the compound which crystallizes is Na2CO3H2O. The interaction between the atmosphere and the gel starts at the “surface” of the samples as observed by the IR reflection spectroscopy." @default.
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- W1968608912 date "1982-03-01" @default.
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- W1968608912 title "Preparation of xNa2O−(1−x)SiO2 gels for the gel-glass process: I. Atmospheric effect on the structural evolution of the gels" @default.
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- W1968608912 doi "https://doi.org/10.1016/0022-3093(82)90247-2" @default.
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