Optical and ESR Studies on Interactions of Ag⁺ and Cu⁺ Ions Diffusing into Glass with Multivalent Elements Fe, As and Sb

Abstract

Interactions between multivalent ions in lasses or between the multivalent ions and Ag⁺ and Cu⁺ ions, which diffused into the glasses from a molten salt, and the formation of metallic colloids were investigated by optical and paramagnetic resonance absorption spectra. It was confirmed by chemical analyses and near-infrared absorption spectra that the redox reaction of pentavalent arsenic or antimony ions with ferrous ions took place. The formation of nAg⁰ mCu⁰ colloids in the lasses was confirmed by optical absorption spectra. Ag⁰ signals of the stained glasses were detected at room temperature only after γ-ray irradiation. No optical absorption caused by Cu₂O colloids and paramagnetic resonance signals by Cu⁰ were found. The ability to reduce Ag⁺ and Cu⁺ ions into metallic colloids was in the order of FeO<As₂O₃<Sb₂O₃. It was presumed that colloidal silver particles were mainly in the forms of nAg⁰(n>1) and Ag⁺ ions.