Abstract
The crystal phase and the electrical conduction in sesquioxide-alkaline earth difluoride systems were investigated. LaOF-type cubic solid solution was found in the system La2O3-CaF2. This phase showed anion conductivity comparable to that of YF3-doped CaF2. Electrolysis by Tubandt's method showed that the conduction was predominantly attributed to fluoride ions. In this solid electrolyte, the fluoride ion is easily substituted by oxide ion through cathode reaction in the oxygen atmosphere.
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