Abstract
Na2O–3SiO2 glasses with up to ≅12 wt% water were prepared under high‐pressure, hydrothermal conditions and their electrical conductivities were measured. The conductivity (σ) was found to depend on H2O content in a manner similar to the “mixed‐alkali” effect. At constant temperature, σ decreased initially with increasing H2O content to a minimum at 3≅4 wt% H2O and increased with further increase in water content. Infrared spectroanalysis of these glasses was made to determine the type of water present in the glass and the results were interpreted in the context of the measured activation energy and preexponential factor of dc conductivity. The sodium ion diffusion coefficient for a glass containing 0.76 wt% H2O was less than that of water‐free glass and in agreement with the electrical conductivity results.
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