Abstract
A series of Na +β″-aluminogallate crystals with gallium substitution for aluminum ranging from 30 to 52 at% was grown by flux evaporation. X-ray diffraction analysis confirms that the structure is analogous to the rhombohedral Na +β″-alumina, and the a- and c-axis lattice parameters increase with increasing gallium content. Two-point ac impedance measurements indicate that the Na +β″-aluminogallates are fast ion conductors with conductivities equal to and slightly lower than that of Na +β″-alumina, 0.36 to 1.18 S/cm at 300°C, with comparable activation energies. Despite the increase in c-axis lattice parameter, the conductivities of the Na + aluminogallates are actually somewhat lower as the c-parameter becomes larger. Conductivities of K + and Ag + ion exchanged crystals are also presented.
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