Anisotropic trivalent ion conducting behavior in single crystals of aluminum tungstate-scandium tungstate solid solution |
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Authors: | N Imanaka M Hiraiwa S Tamura G Adachi H Dabkowska A Dabkowski |
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Affiliation: | (1) Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan;(2) Brockhouse Institute for Materials Research, 1280 Main Street West, Hamilton, Ontario, Canada |
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Abstract: | An aluminum tungstate-scandium tungstate solid solution was successfully grown in a single crystal form by modified Czochralski (CZ) method. The crystal grown was transparent and a satisfactory quality was examined by a polarizing microscope measurement. The Al3+ ion conductivity was considerably improved by forming the solid solution and these by expanding the crystal lattice size. The lattice expansion contributes greatly to enhancing the Al3+ ion conducting behavior especially along c-axis among the three axes in the orthorhombic symmetry. By comparing the ion conducting characteristics between each axis of the single crystal and the polycrystal, the enhancement of the Al3+ ion conductivity is ascribed to the cooperative effects of both ion conductivity increase along c-axis and the conductivity enhancement in the grain boundaries. |
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