Abstract
New hexagonal phases were found in the Sr–K(Na)–Bi–O systems and characterized by X-ray powder diffraction, electron diffraction, and high-resolution electron microscopy (HREM). The crystal structures of Sr3.75K1.75Bi3O12 (space group P62m, a=10.4434(1) Å, c=3.37932(4) Å, RI=0.019, RP=0.055) and Sr3.1Na2.9Bi3O12 (space group P62m, a=10.1102(4) Å, c=3.3389(1) Å, RI=0.024, RP=0.070) were refined using X-ray powder data. The structures consist of chains of BiO6 octahedra linked by the common edges whereas A cations occupy the interstices between the chains. This structure can be considered as the end member of the new (Sr, K)6n+2Bi3n−3O12n homologous series found by electron microscopy. The homologues with n=4, 5, and 6 were observed, and their structures were deduced from HREM observations.
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