Abstract
Three new bismuth oxyhalides BaPbBi3Nb2O11X (X = Cl, Br, I), including the first perovskite bismuth oxyiodide, were prepared by ceramic route. Their crystal structure is formed by intergrowth of Sillen (PbBiO2X) and Aurivillius (BaBi2Nb2O9) phases. The results of Rietveld refinements show that the peculiarities of the building blocks (in particular, the distribution of Ba2+ and Bi3+) remain intact upon formation of the intergrowth structure. The Ba2+ cations prefer pure-oxygen to mixed oxygen-halogen environment which can be explained on the basis of bond valence method.
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