Abstract
The electrical conductivities of Na2O-SiO2-NaF melts and the infrared absorption spectra of its glasses were measured in order to elucidate the effect of fluorides on the structure of silicate melts.The results obtained are as follows: The electrical conductivities increased with increasing NaF when the value of Na2O/SiO2 was constant, but they decreased with increasing NaF when SiO2 mol% was constant. The wave number of absorption peak due to ν3-vibration of silicate anion did not shift at all with increasing NaF.From these results it is considered that NaF does not act on silicate as a “modifier” but as a “dilution” and exists in melts as free Na+ and F− ions, and F− ions contribute to the electrical conductivities with Na+ ions and those contributions are about 1/8 as much as Na+ ions.
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