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Abstract
Abstract Raman spectra of solid and molten ThCl4–KCl system were observed and the structure change of ThCl4 on melting from the octa-coordinate body-centered tetragonal type, D4h, to the tetra-coordinate tetrahedron type, Td, was studied. The decrease in frequency of the symmetric stretching vibration ν1 with decrasing ThCl4 concentration for molten ThCl4–KCl is interpreted as due to the presence of ThCl4, ThCl5−, and ThCl73− complexes in the molten ThCl4–KCl mixture. Such a compositional dependence for ν1 appears to support the idea that, for a decrease in the ThCl4 concentration in molten ThCl4–KCl mixtures, the bond strength between the thorium and chloride ions decreases and the number of chloride ions around the thorium ion increases from 4 to 7.
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