EXAFS studies of molten ZnCl2, RbCl and Rb2ZnCl4

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Abstract
The local structures of molten ZnCl2, RbCl and Rb2ZnCl4 are measured with the EXAFS technique. Several models are used to analyse the data, and some structural parameters as well as the radial distribution functions of the nearest-neighbour atoms around Zn or Rb atoms are obtained. The tetrahedra consisting of four Cl atoms around Zn are found to be dominant and stable in molten ZnCl2. The skewed behaviour of the radial distribution function for Rb-Cl in molten RbCl is also found, while the local structures around Rb can be regarded as a persistence of the solid state but with strong short-range disorder. In molten Rb2ZnCl4, a network linked by Zn Cl4 groups is not found and the nearest-neighbour structures around Rb atoms are more disordered than in molten RbCl. This has also confirmed that the EXAFS method can provide reliable information about the nearest-neighbour atom-atom coordination for some molten salts, which is helpful in specifying the painwise interaction potential.

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