Al3+ ion conducting behavior in single crystal of aluminum tungstate-scandium tungstate solid solution

Single crystal of the aluminum tungstate-scandium tungstate solid solution, which is as large as 1 cm in diameter and 0.6 cm in length, was successfully grown by Czochralski (CZ) method. The crystal is in the Sc-2(WO4)(3) type structure with an orthorhombic symmetry and the lattice constants of the solid solution increased by the substitution of the larger Sc3- ion in the Al site of Al-2(WO4)(3) crystal bulk, showing an isotropic expansion. The Al3+ ion conducting characteristics were characterized and the formation of the Al-2(WO4)(3)-Sc-2(WO4)(3) solid solution was found to contribute greatly in enhancing the Al3+ ion conducting behaviors, especially along c-axis. (C) 2002 Elsevier Science B.V. All rights reserved.