engleski

Influence of iron ions on the structural properties of some inorganic glasses

The effects of iron on the structural properties of Zn-borosilicate glass and Pb-metal-phosphate glass were studied by X-ray diffraction, ^57Fe Mossbauer spectroscopy and IR spectroscopy. Zn-borosilicate glass was prepared with varying amounts of Fe_2O_3 (up to 30 %wt). It was found that the chemical form of added iron (alpha-FeOOH, alpha-Fe_2O_3 or Fe_3O_4) effects the Fe3^3+/Fe^2+ ratio, as well as the distribution of iron ions at diffent coordination sites. At high concentration of iron the crystallization of zinc ferrite in the glass matrix takes place. X-ray diffraction and ^57Fe Mossbauer spectroscopy showed that amount of zinc ferrite in Zn-borosilicate glass decreases with the following order of addition: alpha-FeOOH, alpha-Fe_2O_3 or Fe_3O_4. In Pb-metal-phosphate glass doped with high concentrations of alpha-Fe_2O_3, the crystallization of Fe_3(PO_4)_2 is pronounced. The assignments of IR band positions and corresponding interpretation are given. The importance of this study for technology of vitrification of high-level radioactive wastes is emphasized.

Zn-borosilicate glass ; Fe_2O_3 ; zinc ferrite ; X-ray diffraction ; Mossbauer spectroscopy

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