The realization of a trivalent ion conduction in solids was successful by selecting the sc_2(WO_4)_3-type structure from the consideration of the mobile trivalent cations and the structure which decreases the electrostatic interaction between the migrating trivalent ionic species ndthe framework structure as much as possible. Among the rare earth tungstates, Sc_2(WO_4)_3 was found to hold the most suitable size ofr hte trivalent ion migration in the rleation between the mobile ion isze and the lattice volume. The ion conducting characteristics ofrare earths were studied by means of both the polarization and dc elecgtrolysis techniques. The mobile species was demonstrated to be the trivalent ions in the Sc_2(WO_4)_3-type structure. By the dc electrolysis, the mobile ion species was definitely identified to be the trivalent ions in the Sc_2(WO_4)_3-type tungstates. IN addition, the demonstration of a macroscopic Al~(3+) ion conduction in the turgstate structure was directly accomplished.
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