The Effect of correlation between iron and cerium in borosilicate glass on the structure

Okamoto, Yoshihiro  ; Nagai, Takayuki  ; Tsuji, Takuya  ; Matsumura, Daiju   

Some elements such as chromium, iron, rhodium and cerium have multiple valence in the silicate glass. Among them, iron and cerium are known to show a strong mutual correlation in redox behavior. It is reported that Fe (II) is oxidized by Ce (IV) to produce Ce (III) and Fe (III), resulting in the formation of Ce (III) -O-Fe (III) complex in the silicate glass. It is natural to think that if the valence of a constituent element changes in glass, the local structure around that element also changes. In this study, XAFS analysis of Fe and Ce elements was carried out when the Fe content in borosilicate glass was changed, and the changes in the chemical state and local structure were investigated. It was found that by adding Fe, tetravalent Ce (IV) was reduced and the proportion of trivalent Ce (III) increased, and the local structure around Ce also changed accordingly. It was found that Ce was dispersed in the glass phase regardless of whether it was trivalent or tetravalent. However, when Ce was tetravalent, the structural order of the Ce-O pair was as high as that of crystalline CeO.