An extensive glass‐forming region has been determined for the lead fluorosilicate system. These glasses have a very high anionic (fluorine) conductivity. The value of 2 x 10 ‐4 ω ‐1 .cm ‐1 at slightly less than 200°C found for one glass is the highest anionic conductivity reported to date in a glass. Glass transition temperatures, thermal expansion coefficients, and UV‐visible spectra were also measured. Results of these measurements and melt‐history studies will be discussed and related to a proposed structural model for the lead fluorosilicate glasses.
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Coon et al. (1988) studied this question.
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