Abstract
A set of semi-empirical criteria have been developed to assess the contribution of various components to IR edge absorption in multi-component solids. These have been applied to ZrF 4 and HfF 4 based glasses and verified experimentally. Results indicate that monovalent cation fluorides no lighter than NaF, divalent cation fluorides no lighter than CaF 2, trivalent cation fluorides no lighter than LaF 3 and quadrivalent cation fluorides no lighter than ThF 4 contribute negligibly to IR edge absorption in such glasses.
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