Abstract
The effects of sodiumlithium ion exchange on the Young's modulus of three silicate glass systems containing 10, 18 and 30 mole% lithium oxide were investigated. An increase in the Young's modulus was observed in each glass system. The change in the Young's modulus was found to be approximately proportional to the inverse fourth power of the volume change estimated from molar volumes. This proportionality became invalid when total ion exchange exceeds about 30%. An increase in the Young's modulus as high as 12% was observed. The density of an ion-exchanged glass was also determined and was found to increase almost linearly with the amount of ion exchange. Compared with the equilibrium densities of the corresponding compositions, the ion-exchanged glasses were found to have been densified.
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