Abstract
Dispersions of Al 2O 3 as well as CeO 2 in CaF 2 are found to enhance the conductivity of CaF 2. Both these systems are biphasic and the electrical conduction in them is purely ionic in nature. At 650 K the increase in the ionic conductivity of the dispersed solid electrolyte system CaF 2Al 2O 3 is by about two orders of magnitude in relation to the conductivity of the host electrolyte CaF 2, whereas for the CaF 2CeO 2 system it is about three orders of magnitude. Some aspects of the increase in the ionic conductivities of CaF 2Al 2O 3 and CaF 2CeO 2 electrolytes can be explained by a recent theoretical model. It is proposed that a substantial enhancement in the vacancy concentration of CaF 2, brought about by the attraction of F − ions to the surface of Al 2O 3 (or CeO 2), is responsible for the low temperature increase in the ionic conductivity of CaF 2.
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