Abstract
A new fluoride ion conducting composite CaF 2-LiF was synthesized by an arc-melting technique and characterized by X-ray and complex impedance analysis. A conductivity enhancement of about three orders of magnitude was obtained as a result of dispersing LiF in the CaF 2 matrix. The observed conductivity enhancement was interpreted on the basis of the space charge model for ionic conduction. Jonscher's universal power law relation, σ(ω)=σ(0)+ Aω‰ was used to explain the observed frequency dispersion of conductivity. The conductivity parameters such as power law exponent n, relaxation time τ and activation energy for relaxation E τ were calculated and the results are reported.
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