Abstract
The mixed alkali effect is investigated in the tellurite glass system 30[(1 − x)Li 2O · xNa 2O]: 70TeO 2 ( x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) through (i) electrical conductivity and (ii) glass transition temperature measurements. The isothermal conductivity, σ, activation energy for the conduction process, E a, and the glass transition temperature, T g, all showed non-linear behaviour upon substitution of one alkali ion by another, with minima in σ and T g at Na/(Na + Li) ∼ 0.6, as in borate glasses. The experimental results discussed in the light of current mechanisms (interchange transport process and 1-D conduction process) along with the relevant structural aspects show that the interchange transport mechanism operates in both single and mixed alkali tellurite glasses.
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