Abstract
The 7Li nuclear spin-lattice relaxation time has been measured as a function of temperature for a series of mixed-alkali Li-Na disilicate glasses. No evidence of a pronounced non-linear mixed-alkali effect was found for the low-temperature activation energy, ELT, of the spin-lattice relaxation (SLR) rate, nor of the ratio ELT/Eσ (where Eσ is the dc conductivity activation energy). These results can be interpreted, in terms of Elliott and Owens' diffusion-controlled relaxation model for SLR, as indicating that there is no significant change in the number of mobile ions in mixed-alkali glasses; instead, the mixed-alkali effect must be due to changes in the ionic mobility.
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