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Influence of water content on structure and kinetics of structural relaxation of sodium borate glasses

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Abstract:

The influence of the water content on microheterogeneous structure of sodium borate glass containing 2·5 and 5·0 mol% Na2O and on kinetics of structural relaxation of vitreous boron oxide and sodium borate glasses is examined by small angle x-ray scattering (SAXS) at isothermal heat treatments at various temperatures. An increase in the water content results in an increase of the size of inhomogeneous regions and in a decrease of <(Δ ϱ)2> of heterogeneous structure. Thus, water promotes aggregation of alkali borate structural elements. Kohlrausch equation describes the kinetics of SAXS by the thermal density fluctuations. In dry glasses β in Kohlrausch's equation is close to 1 and decreases to 0·5 in glasses containing 0·7–1·0 mol% H2O.

Document Type: Research Article

Publication date: August 1, 2006

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