Abstract
Abstract Most of the alkali halides are freely miscible with one another. The solid solubilities of fluorides, however, exist over a limited range. Thus, not more than 1.5 mol.% NaF can be added to LiF, and the maximum amount of LiF that can be accommodated substitutionally in NaF is about 8.5 mol. 96. Fate of LiF added in excess to these amounts is unknown. It has been suggested that Li+ may enter interstitially. The coloration of the solid solutions provide a clue to the position of the foreign alkali ion in the host lattice. The optical and TSL measurements on the coloured NaF:LiF samples are presented in this paper, which show that Li+ partially goes to interstitial sites, and the remaining amount forms colloids.
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