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

Properties of selected zirconia containing silicate glasses II.

 R. Karell, J. Kraxner, M. Chromčíková, M. Liška

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.

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