Abstract
K 1− x Ti 2+ x Ga 5− x O 12, a new compound isostructural with NaTi 2Al 5O 12, is grown as orthorhombic needle crystals with unit cell dimensions a=16.329, b=9.265, c=2.9843 A ̊ , and space group Pbam. The structure, framed by GaO 6, TiO 6 octahedra and GaO 4 tetrahedra, contains large tunnels which act as one-dimensional conduction paths for K + ions. The K + ion is delocalized on the tunnel axis, and its distribution pattern is similar to that in K x Ga 8Ga 8+ x Ti 16− x O 56 rather than that in the priderites. This suggests the existence of large bottleneck windows in the path, but the Fourier map of z= 1 2 section showed those windows to be tight. Electron diffraction patterns revealed diffuse scattering concentrated in certain reciprocal lattice planes normal to the tunnel axis, which are attributed to intra- and interchannel short range ordering of K + ions.
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