Abstract
Abstract The crystal structure of SrTi6Co6O19 has been refined in space group P63/mmc to an R-value of 0.045 (Rw = 0.038). The distribution of the cobalt and titanium ions has been determined by refining the site occupancy factors and by bond lengths considerations. Co2+ occupies the tetrahedral sites and Ti4+ is enriched on the octahedral sites in the spinel S-blocks and in the face-sharing octahedra in the R-blocks of the magnetoplumbite type structure, while Co2+ and Ti4+ are distributed at random over the trigonal bipyramid of the R-blocks and the octahedra between the R- and spinel S-blocks. The cation distribution is discussed in terms of the Madelung part of lattice energy.
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