Abstract
The kinetics of interaction between the sodium silicate glass 20Na2O · 80SiO2 and molten salts in a dc electric field is investigated using the electron-probe X-ray microanalysis and radioactive-tracer technique. The influence of the electric field strength, the temperature, the interaction time, and the composition of a molten salt on the concentration distribution of alkali cations in the 20Na2O · 80SiO2 glass in the course of field-assisted diffusion is elucidated. The effective electric mobilities of potassium ions are calculated, and the parameters of the temperature dependence of the electric mobility are determined. It is revealed that the application of an electric field does not affect the ion-exchange equilibrium in the system. The correlation factor for diffusion of impurity ions is determined for the first time. The obtained value of the correlation factor indicates that the processes of self-diffusion and heterodiffusion of alkali cations in binary silicate glasses occur through the same (relay-race) mechanism. It is established that the Nernst-Einstein equation, which relates the electric mobility to the diffusion coefficient and provides the basis for the description of the field-assisted diffusion, holds only for the processes bearing no relation to variations in the composition of the glass.
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Sviridov, S.I. and Eliseeva, N.P., Field-Assisted Diffusion of Potassium Ions in Sodium Silicate Glass, Fiz. Khim. Stekla, 2006, vol. 32, no. 6, pp. 820–840 [Glass Phys. Chem. (Engl. transl.), 2006, vol. 32, no. 6, pp. 604–611].
Moiseev, V.V., Permyakova, T.V., and Sheshukova, G.E., Ion-Exchange Equilibrium in the Glass-Molten Salt System, Fiz. Khim. Stekla, 1977, vol. 3, no. 1, pp. 19–28.
De Wet, W.J., van Reenen, T.J., and van Niekerk, M., Investigations on the Ion-Exchange and Ionic Transport Properties of Glass Membranes in Molten Salts by an Electrolytic Transport Technique, J. Phys. Chem., 1971, vol. 75, no. 18, pp. 2815–2822.
Frischat, G.H., Ionic Diffusion in Oxide Glasses, Aedermannsdorf: TransTech, 1975.
Abou-El-Leil, M. and Cooper, A.R., Analysis of Field-Assisted Binary Ion Exchange, J. Am. Ceram. Soc., 1979, vol. 62, no. 7/8, pp. 390–395.
Honkanen, S. and Tervonen, A., Experimental Analysis of Ag+-Na+ Exchange in Glass with Ag Film Ion Sources for Planar Optical Waveguide Fabrication, J. Appl. Phys., 1988, vol. 63, no. 3, pp. 634–639.
Albert, J. and Lit, J.W.Y., Full Modeling of Field-Assisted Ion Exchange for Graded-Index Buried Channel Optical Waveguides, Appl. Opt., 1990, vol. 29, no. 18, pp. 2798–2804.
Permyakova, T.V., Makeeva, N.M., and Zhabrev, V.A., Anodic Dissolution of Silver in Glasses, Fiz. Khim. Stekla, 1999, vol. 25, no. 6, pp. 679–683 [Glass Phys. Chem. (Engl. transl.), 1999, vol. 25, no. 6, pp. 512–515].
Engel, J.R. and Tomozawa, M., Nernst-Einstein Relation in Sodium Silicate Glass, J. Am. Ceram. Soc., 1975, vol. 58, no. 5/6, pp. 183–185.
Kahnt, H., Kaps, Ch., and Laborde, P., New Method of Measuring Diffusion Coefficient and Mobility of Radio-Tracer Ions in Glasses, in Proceedings of the XV International Congress on Glass (ICG), Leningrad, Russia, July 3–7, 1989, Leningrad: Nauka, 1989, vol. 2a, pp. 101–106.
Heinemann, J. and Frischat, G.H., The Sodium Transport Mechanism in Na2O · 2SiO2 Glass Determined by Chemla Experiment, Phys. Chem. Glasses, 1993, vol. 34, no. 6, pp. 255–260.
Kahnt, H., Kaps, Ch., and Offermann, J., A New Method of Simultaneous Measurement of Tracer Diffusion Coefficient and Mobility of Alkali Ions in Glasses, Solid State Ionics, 1988, vol. 31, no. 3, pp. 215–220.
Zhabrev, V.A., Diffuzionnye protsessy v steklakh i stekloobrazuyushchikh rasplavakh (Diffusion Processes in Glasses and Glass-Forming Melts), St. Petersburg: Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, 1998 [in Russian].
Compaan, K. and Haven, Y., Correlation Factors for Diffusion in Solids, Trans. Faraday Soc., 1956, vol. 52, no. 6, pp. 786–801.
Compaan, K. and Haven, Y., Correlation Effects for Diffusion in Solids: 2. Indirect Interstitial Mechanism, Trans. Faraday Soc., 1958, vol. 54, no. 9, pp. 1498–1508.
Evstrop’ev, K.K., Diffuzionnye protsessy v stekle (Diffusion Processes in Glasses), Leningrad: Stroiizdat, 1970 [in Russian].
Terai, R. and Hayami, R., Ionic Diffusion in Glasses, J. Non-Cryst. Solids, 1975, vol. 18, no. 2, pp. 217–264.
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Original Russian Text © S.I. Sviridov, 2007, published in Fizika i Khimiya Stekla.
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Sviridov, S.I. Influence of the composition of a molten salt on the field-assisted diffusion of potassium ions in the 20Na2O · 80SiO2 glass. Glass Phys Chem 33, 550–555 (2007). https://doi.org/10.1134/S1087659607060041
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DOI: https://doi.org/10.1134/S1087659607060041