Abstract
The crystal structures of general composition nBi2O3-mB2O3 were analyzed and systematized with the use of the structures of borate groups. Based on the CNs calculated by the bond valence method, the shapes of bismuth coordination polyhedra derived from an octahedron were suggested. A correlation was found between the number of BO3 triangles and BO4 tetrahedra in borate groups, the average CN of Bi atoms, and the degree of distortion of Bi polyhedra as a function of the m: n ratio, as well as between the polarity of BO4 tetrahedra and noncentrosymmetry of the structures. The role of Bi3+ with the active E pair in the manifestation of specific features of the forms of bismuth polyhedra and the types of connection of boron polyhedra was elucidated.
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Original Russian Text © G.M. Kuzmicheva, T.I. Mel’nikova, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 1, pp. 74–81.
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Kuzmicheva, G.M., Mel’nikova, T.I. Structural features of bismuth borates in the system nBi2O3-mB2O3 . Russ. J. Inorg. Chem. 54, 73–80 (2009). https://doi.org/10.1134/S0036023609010148
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DOI: https://doi.org/10.1134/S0036023609010148