Abstract
The crystal structure of Tl 2O·11Al 2O 3 has been determined from three-dimensional X-ray data. The compound forms hexagonal crystals with a = 5.598, c = 22.93 Å, and Z = 1 in space group P6 3 mmc . The structure has been refined by least-squares methods with anisotropic temperature factors to an R value of 0.063 for 351 independent reflections collected by diffractometry. The crystal is composed of alternate stackings of the spinel block and the ion-conducting layer, both of which are linked together by the covalently bonded corner-sharing O 3AlOAlO 3 tetrahedra along the c-axis. The occupational percentages of the mobile ion were determined from the Fourier synthesis and compared with those of Ag- and Na-β-alumina.
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