Abstract
Single crystals of gallium analogs of K +- and NH + 4-β″-alumina (K +- and NH + 4-β″-gallate) were synthesized by ion exchanging Na +-β″-gallate. Crystal structures of the two gallates were refined using a single-crystal X-ray diffraction method. The positive charges due to excess K + ions over the stoichiometric β-alumina composition in K +-β″-gallate were compensated by substituting Na + ions for Ga 3+ ions at the middle of spinel block. These Na + ions were expelled from the crystals by ion exchange for NH + 4 ions with considerable changes in crystal structure. The excess positive charges in NH + 4-β″-gallate were neutralized by O 2− ions at the mO site associating with a new type of Frenkel defects around the conduction plane. The charge-compensation mechanism of these gallates were discussed from the crystal chemical point of view.
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