ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 51, (3) 125 - 130 (2007)

Karell Radovan 1, Kraxner Jozef 2, Chromčíková Mária 2, Liška Marek 2
1 Faculty of Industrial Technologies, Alexander Dubček University of Trenčín, Ivana Krasku 491/30, Púchov, SK-020 01, Slovak Republic
2 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, SK- 911 50, Slovak Republic

Keywords: Viscosity, Density, Refractive index, Glass transition temperature, Zirconia-silicate glasses

Viscosity, density, thermal expansion, glass transition temperature, refractive index, molar refraction, and chemical durability of 15M₂O·10ZnO·xZrO₂·(75-x)SiO₂ (M = Na, K; x = 1, 3, 5, and 7) glasses were measured. The strong influence of ZrO₂/ SiO₂ equimolar substitution on measured physical and chemical properties was detected in accord with the assumption of the glass network strengthening by ZrO₂. The effect of ZnO / CaO substitution was quantified by comparison with the results obtained for 15M₂O·10CaO·xZrO₂·(75-x)SiO₂ (M = Na, K; x = 1, 3, 5, and 7) glasses. It was demonstrated that the ZnO/CaO substitution strengthens the silicate network.

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