Trivalent rare earth ion conduction in the scandium tungstate type structure

From the consideration of the mobile trivalent ions and the structure which reduces the electrostatic interaction between the framework and the mobile trivalent ionic species as much as possible, a trivalent-ion conduction in solids was successfully realized with the Sc-2(WO4)(3)-type structure. Amo ng the molybdates and the tungstates with the Sc-2(WO4)(3)-type structure, Sc-2(WO4)(3)and Sc-2(MoO4)(3) were found to be of the most suitable size fo r the trivalent-ion conduction in the tungstate and the molybdate series, r espectively. By a de electrolysis, the mobile species was clearly demonstra ted to be a trivalent ion in the Sc,(WO,),-type structure. (C) 2000 Elsevie r Science S.A. All rights reserved.