Abstract
119Sn and 29Si solid-state nuclear magnetic resonance studies on lead silicate glasses containing different amounts of SnO2 confirmed that tin exists in the glass as distorted SnO6 polyhedra and there is no direct interaction between tin and silicon structural units. Transmission electron microscopic studies have established that tin structural units are uniformly distributed in the glass. Significant changes in the values of glass transition temperature, microhardness, and thermal expansion coefficient with SnO2 incorporation into the glass have been attributed to the increased rigidity of the glass network brought about by the replacement of weaker Pb–O linkages with stronger Sn–O linkages.
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