Abstract
The I− ion conduction was demonstrated and quantified in the La0.70Sr0.25Zn0.05OI0.70 solid. The I− ion is considered to be an inferior conductor because of its large ionic size compared to the previously reported conducting ion species. Using modified Tubandt electrolysis, a weight increase at the anodic pellet and a corresponding weight decrease at the cathodic pellet were observed. The weight changes were in good agreement with the theoretical values estimated by considering pure I− ion migration. Furthermore, the iodine element appeared at the anode, and the iodine concentration at the cathode decreased after electrolysis, indicating that the migrating species was only I−. This is the first study to elucidate the conduction of iodide ions in solids.
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