The crystal structure of BaNiOa has been determined by single-crystal analysis. The space group is P63/mmc and lattice constants are a= 5.629 (3) and c=4"811 (3) A, with Z= 2. The structure has been refined by the block-diagonal least-squares technique to a final R value of 0-049. The structure is characteristic with linear chains of nickel atoms having a Ni-Ni distance of 2"405 (2) A,; the NiO6 octahedron is trigonally distorted.
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