Ceramics-Silikáty 53, (1) 55 - 58 (2009) |
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CONFIGURATIONAL ENTROPY OF SELECTED ZIRCONIA CONTAINING SILICATE GLASSES
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Karell Radovan, Liška Marek, Chromčíková Mária
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Vitrum Laugaricio – Joint Glass Centre of the Institute of Inorganic Chemistry, Slovak Academy of Sciences, Alexander Dubček
University of Trenčín and RONA, a.s., Študentská 2, Trenčín, 911 50, Slovak Republic
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Keywords: Configurational entropy, Adam - Gibbs equation
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The parameters of Adam-Gibbs equation (AG) were estimated for 28 glasses from the 15(K₂O,Na₂O)·10(ZnO,CaO)·75(ZrO₂,SiO₂)
system. Configurational entropy at glass transition temperature, Sconf(Tg), and the BAG parameter of AG equation were expressed
as linear functions of the glass composition given in molar fractions of oxides. The same value of the AAG parameter was used
for all studied systems. The resulting AG equation described the experimental viscosity values with acceptable accuracy in
the high temperature region. The obtained compositional trend of Sconf(Tg) corresponds well with the structural function of
particular oxides. |
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