Properties of Silica Glasses Containing Small Amounts of B2O3
In the classic mixed alkali effect a maximum occurs in the electrical resistivity and activation energy for conductivity (∆EA) when one progressively substitutes one alkali (R1) with another (R2). This effect is illustrated in Figure 1. LaCourse, 1 using the electrodynamic model of Hendrickson and Bray,2, 3 has predicted that in certain glasses containing a single alkali ion type, but with two dissimilar bonding sites for the alkali ion, an effect similar to the mixed alkali effect may be observed (Figure 2). Taylor and Rindone4 have postulated a similar effect to account for effects of water on the internal friction in glasses.
KeywordsActivation Energy Vibrational Frequency Silica Glass Bonding Site Mixed Alkali
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