Viscosity of liquid silica, silicates and alumino-silicates

Viscosity measurements are reported for amorphous silica and liquids belonging to the systems SiO2-M, SiO2-Al2O3-M, where M is an alkali-earth metal oxide, MnO, or alumina, and the systems SiO2-“FeO”, SiO2-FeO-Fe2O3-CaO, and SiO2-Al2O3-N, where N = Na2O or K2O. The implications of these measurements concerning the coordination of Al and the structure of these liquids are briefly discussed. Stable liquids in the systems SiO2-Al2O2-M show a non-Arrhenian temperature dependence of their viscosity, in general. Results obtained with empirical methods to calculate the viscosity of silicate liquids are compared with our observations.

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