Abstract

A complete understanding of the oxidation state and coordination structure of inorganic species under actual hydrothermal conditions is critical to areas such as geochemistry and corrosion science. However, fundamental studies on the chemistry of inorganic aqueous solutions at elevated temperatures are scarce. Such information is also of importance in the treatment of waste slurries, including processes such as drying, calcining and vitrification. X-ray absorption spectroscopy (XAS) can provide information on bond distances and their strength or covalency, the coordination symmetry around a central atom and its oxidation stateJ '2 All of these properties are subject to change during chemical changes at hydrothermal conditions. Indeed, in our previous XAS studies we were able to gain valuable information on the solvation environment of electro-

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