Abstract
A comparative study of electrical properties of two series of glasses ZrF 4(0.62−0.4 x)BaF 2(0.30−0.5 x)LaF 3(0.08−0.1 x)AF( x) (A = Li, Na) (0 < x < 0.30) has been carried out as a function of AF content. A minimum of ionic conductivity and 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 ZrF 4BaF 2ThF 4LiF system, it is proposed that in the low concentration Li domain Li/F ⪆ 0.07 ) , they 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 23Na NMR study has shown that Na + ions do not participate in the conductivity.
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