The dc electrical conductivity of R‐Zn‐Ba‐Yb‐Th fluoride glasses, where R is Li or Na, was measured as a function of RF content. The replacement of BaF2 by RF resulted in a decrease in the electrical conductivity. This finding is the reverse of that expected for oxide glasses, but is in agreement with reports of similar behavior in zirconium‐based fluoride glasses. The electrical conductivity of a glass containing LiF was always less than that of the corresponding glass containing NaF. It is suggested that these results are due to changes in the strain energy needed to move a fluorine ion from one site to another.
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