Abstract
The density and ionic conductivity of the system (SiO2-Na2O-NaX), where X represents Cl−, Br−, and I−, are studied. Substitution of alkali halide for alkali oxide is found to produce an open structure. The ionic conductivity as well as the molar volume show an increase as the halogen content is increased. Glasses containing I− show higher conductivity than those containing Br− and Cl−. The density trend cannot be a competition between the sizes of anions, rather it is assumed to be due to backing in the structure.
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