Abstract
The glass-transition temperature and the electrical conductivity of lithium borate (0.33Li2O-0.67B2O3) glasses with various isotopic compositions were determined by differential thermal analysis and by impedance spectroscopy, respectively. The obtained glass-transition temperature as well as the vibrational frequency of B-O network structure was independent of lithium isotopic composition. This result indicates that lithium ions, which exist as network modifier, only weakly interact with B-O network structure. In addition, the glass-transition temperature increased with 10B content although the reason has not been understood. The electrical conductivity, on the other hand, increased with 6Li content. The ratio of the conductivity of 6Li glass to that of 7Li glass was found to be 2, being larger than the value (7/6)1/2 calculated with the simple classical diffusion theory. This strong mass dependence could be explained by the dynamic structure model, which assumes local structural relaxation even far below the glass-transition temperature. Besides, the conductivity appeared to increase with the glass-transition temperature. Possible correlations between the glass-transition temperature and the electrical conductivity were discussed.
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