Abstract
A comparative study of electrical properties of both series of glasses ZrF4(0.62-0.4x)BaF2 (0.30-0.5x)LaF3 (0.08-0.1x)AF(x) (A = Li, Na) (0 < × < 0.30) has been carried out as a function of AF content.A minimum of ionic conductivity bound to a maximum of activation energy has been detected when the atomic Li/F ratio is equal to ⋍ 0.07. by analogy with the glasses belonging to ZrF4BaF2ThF4LiF system, it is proposed that in the Li-low concentration domain (Li/F ≲ 0.07) transport properties result from mixed contributions of mobile Li+ and F- ions and for high Li concentrations (Li/F ≳ 0.07), they depend only on the Li+ rate.When A = Na, on the contrary, conductivity decreases regularly and activation energy increases with increasing x. The electrical properties result only from the contribution of mobile F- ions. A 23 NMR study has shown that Na+ ions do not participate in the conductivity mechanisms.
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