Interaction between Sodium Silicate Melts with Concentration
Gradient of Sodium and Silicon Oxides

S. V. Zaitsev, V. A. Zhabrev, and V. G. Konakov

Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
ul. Odoevskogo 24/2, St. Petersburg, 199155 Russia

Received May 7, 1997

Abstract—A study is undertaken on the interaction between 30Na₂O · 70SiO₂ and 15Na₂O · 85SiO₂ melts in
the temperature range 850–1050°C for reaction times of 2, 4, and 8 h. It is found that the concentration profiles
plotted on the N–(x/) coordinates coincide very closely. This fact provides support for the diffusion kinetics
of interaction. The effective diffusion coefficients for the silicon–oxygen associates at 850, 950, and 1050°C
are equal to 1.3 10^–10, 1.8 10^–10, and 2.5 10^–10 cm²/s, respectively. The activation energy for diffusion is
11 ± 2 kcal/mol. The kinetic and energy parameters of the interaction are discussed in terms of oxygen ion activ-
ity. The interdiffusion and viscous flow processes are considered.

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