Abstract
A new series of fluoride glasses of formulation ZrF 4(0.25)-ZnF 2(0.15)-YF 3(0.05)-AlF 3(0.10)-CdF 2 (0.17 − 2x 5 )-BaF 2(0.28 − 3x 5 )-LiF(x) and containing a wide LiF concentration range (0 ≤ x LiF ≤ 0.35) has been investigated by impedance spectroscopy: the variation of various electrical parameters has been determined as a function of composition. The results obtained with two other series of fluoride glasses covering the (0 ≤ x LiF ≤ 0.30) and (0.20 ≤ x LiF ≤ 0.60) concentration ranges are confirmed. A conductivity minimum associated with an activation energy maximum and a minimum of the decoupling index Rτ( T g ) takes place for x LiF ∼- 0.20. It is explained by the crossing with increasing x from a conductivity due preferentially to F − ions to a conductivity due preferentially to Li + ions. Within each series, the composition relative to conductivity minimum offers a value r ⋍ 1 of the ( x LiF x BaF 2 ) ratio. For higher x LiF rates, the β conductivity relaxation parameter involves also a minimum. Comparison of various series studied indicates that the composition relative to β minimum offers a value r ⋍ 2 of the ( x LiF x BaF 2 ) ratio. The structural origin of the β minimum is confirmed.
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