Abstract
It is shown that the broadening of differential thermal analysis peaks and the nature of certain void defects, observed in Stockbarger-grown crystals of the complex lithium-fluoride/rare-earth-fluoride mixtures, are consistent with compositional changes due to segregation of lithium fluoride. The observed melting reactions suggest that, whilst this material must be a solid solution, if there is a liquidus-solidus separation then it is sufficiently small for an approximation to congruently melting behaviour to be made. No evidence for peritectic behavior was found.
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