Abstract
Crystals of Naβ″-gallate were grown by a technique different from the conventional method, and the structure was refined using single crystal X-ray diffraction technique. Na atoms are substituted for 16% of Ga at one of tetrahedral sites in the spinel block, which is larger than those reported for β″-gallates. In the conduction slabs, Na ions are located at 6(c) and 18(h) sites with the occupancies 35% and 16%, respectively, and oxygen is disordered at 18(h) sites in place of 6(c), which is the first case observed for β″-gallates. Time dependence of cell dimensions was also measured in order to evaluate the stability of the crystal. The c-axis increased by about 0.4 Å over two months.
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