Abstract
The oxidation state of Fe and U and the coordination surrounding of Fe in uranium-containing sodium aluminum iron phosphate glasses were determined by analysis of the FeK and UL3 X-ray absorption nearedge structure (XANES), X-ray photoelectron spectroscopy (XPS), and Mossbauer spectroscopy on 57Fe nuclei. Uranium is present in the glasses in the form of U(V) and U(VI), and iron, in the form of Fe(III) and Fe(II), mainly in the distorted octahedral surrounding. The fraction of U in various oxidation states depends on the form of untroducing uranium (UO2 or UO3) and on the oxide concentration. With an increase in the UO3 concentration in glasses, the fraction of U(VI) increases and the fraction Fe(III) relative to Fe(II) decreases.
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