Ag_2O-B_2O_3-Al_2O_3ガラス中の銀の状態と熱処理による変化(<特集>セラミック材料)

概要

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Ag_2O-B_2O_3-Al_2O_3 glasses were prepared by melting and quenching method and the state of silver in the glasses was examined by optical absorption spectra. These glasses have two absorption peaks at less than 300nm and 320nm, which correspond to Ag^+ ion and atomic Ag, respectively. The content of atomic silver increased with the increase of temperature. Metallic Ag (Ag colloid) precipitated at the glass surface by the heat-treatment at 400℃ which causes the absorption peak at 440nm. The origin of the precipitated colloid was considered to be atomic Ag dissolved in the glass because the intensity of the absorption peak at 320nm decreased by the heat treatment. However, the precipitation mechanism is not clear. Since the peak of atomic silver was not observed for the slowly cooled glass, it is considered that the free volume at the glass surface which have high fictive temperature plays an important role for the precipitation of silver.
社団法人日本材料学会の論文
2002-06-15