混合アルカリアミノゲルマン酸塩ガラスの内部摩擦 : 混合アルカリピークの複合性について

概要

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The internal friction of alkali aluminogermanate glasses containing no nonbridging oxygen ions was measured by the free torsional vibration method. The internal friction as a function of temperature revealed two peaks in mixed-alkali glasses with low alkali contents. Those peaks increased rapidly in magnitude and came close to overlapping with increasing alkali content. The results indicate that both peaks can be assigned as mixed-alkali peaks, and that the mixed-alkali peak was closely related to the low-temperature peak in single alkali glasses. The following explanation is proposed. (1) There are two kinds of mechanism responsible for the mixed-alkali peak. (2) The mixed-alkali peak is essentially caused by the individual and duplex movement of two species of alkali ions which are affected by the interaction between different kinds of alkali ions. (3) When two mixed-alkali peaks overlap, there is little difference between the two mechanisms since the two species of alkali ions move with almost the same activation energy. (4) The rapid increase in magnitude of the mixed-alkali peak with increasing alkali content is probably attributed to a considerable increase in the number of mobile alkali ions which contribute to the mechanism of the mixed-alkali peak, and at the same time is also attributed to the increase in energy consumption during alkali ion migration.
社団法人日本セラミックス協会の論文
1992-01-01