The structure of rhenium-containing sodium alumino (iron) phosphate glasses

The phase composition, structure, and rhenium (technetium surrogate) speciation in sodium aluminum(iron) phosphate glasses synthesized under oxidizing and reducing conditions were examined using X-ray diffraction, scanning electron microscopy, Fourier transform infrared, Raman, and X-ray absorption near edge structure spectroscopic methods. In the sodium aluminophosphate glasses, Re is present in both metallic Re(0) form and Re(VII). In the Sodium aluminum-iron phosphate glasses, regardless of the conditions of their production, all the Re occurred as Re(VII). Elemental leach rates from the Re-containing glasses were found to be lower than the standard values.