Abstract
We evaluate within a microscopic ionic model the structure and the binding of small clusters which may exist as structural units in molten ThCl 4 and ZrCl 4 and in their mixtures with alkali halides, according to Raman scattering studies of Photiadis and Papatheodorou. The model is adjusted to the two isolated tetrahedral molecules. Appreciably higher ionicity is found for ThCl 4 than for ZrCl 4, and this fact underlies the strikingly different structures of the two systems in the dense liquid state -- in particular, a molecular-type structure for molten ZrCl 4 against a structure including charged oligomers in molten ThCl 4.
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