Basic research programs of vitrification technology for waste form reduction, 60; XAFS analysis of rare earth and platinum group elements in simulated borosilicate glasses including phosphorus

Okamoto, Yoshihiro  ; Shiwaku, Hideaki   ; Shimamura, Keisuke; Oyama, Koichi ; Kobayashi, Hidekazu ; Nagai, Takayuki  

The chemical state and local structure of platinum group and lanthanide elements in simulated borosilicate glasses including phosphorus were investigated by using synchrotron radiation based X-ray absorption and imaging techniques. By adding phosphorus to the simulated borosilicate glass samples, ratios of trivalent cerium (Ce(III)/Ce(IV)) and metallic rhodium (Rh/RhO) increased. They suggests that oxidation state in the glass changed to reductive by adding phosphorus. On the other hand, XAFS spectra of some elements like Mn, Fe, Zn, Sr, Y and Zr did not changed by adding phosphorus and showed almost the same profiles in each element.