Internal Friction of Proton-Exchanged Li2O·Al2O3·2SiO2 Glass |
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| Authors: | A ISMAIL A ABDEL-LATIF DELBERT E DAY |
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| Affiliation: | Department of Ceramic Engineering, School of Mines and Metallurgy, University of Missouri-Rolla, Rolla, Missouri 65401 |
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| Abstract: | Protons were introduced into the surface of an Li2O·Al2O3·2SiO2 glass fiber (0.5 mm in diameter) by ion exchange in NH4HSO4 at 366°C for 21 h. Infrared absorption measurements established that the protons were associated with bridging oxygen ions. After ion exchange, the magnitude of the alkali internal friction peak decreased and a new peak appeared at ～220°C. This new peak is attributed to the interaction of alkali and hydrogen ions, independent of the presence of nonbridging oxygen ions. |
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