Abstract
Abstract A structural study of silver borate glasses containing 20 or 30 mol% AgCl and 1 mol% Fe2O3 has been performed by means of Mössbauer spectroscopy. The distinct decreases in the Mössbauer parameters observed in the borate glasses with Ag2O contents higher than about 10 mol% suggest that chloride ions are covalently bonded with tetrahedral iron or boron atoms as nonbridging chlorine. On the other hand, chloride ions are considered to be ionically bonded with Ag+ ions at the interstitial sites of the three-dimensional network composed of BO3, BO4, and FeO4 units when the Ag2O content is lower than 10 mol%. Measurements of the glass transition temperatures and the electric conductivity show a good agreement with the Mössbauer results, suggesting that mobile and electric conducting Ag+ ions change their configurational sites from the interstitial sites which are close to Cl− ions to different interstitial sites which are close to the nonbridging chlorine atom.
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