Abstract
Of 27 typical structures of niobates and tantalates, five structures are assigned to the F-type of cation sublattice (ABC-packing of trigonal 36 planes), eight structures are referred to the I-type (body-centered cation sublattice), and eight structures are considered to be the β-K2UF6 type with a hollow hexagonal framework centered by a scanty-type cation. In two cases (Mg3Nb6O11 and Cu5Ta11O30), the cation framework consists of two types of different-scale nets that are commensurate in a plane. In some structures (K2Ta4F4O9, ThTa2O7, and β-K2UF6 type), the “splittng” plane effect is noted for the first time: the neighboring nonequivalent planes of the same family (dhkl≈1.9 Å) are filled by cations according to the complement principle, when the vacant sites of one plane lie over the occupied sites of another and vice versa. These structures are treated as modified hexagonal one-layered (AA) type. In the structure of La2TaO4Cl3, the Cl− anion enters the cation matrix, i.e., occupies the vacant sites of its nets.
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References
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Additional information
Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences. Institute of Crystallography, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 37, No. 2, pp. 319–329, March–April, 1996.
Translated by L. Smolina
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Borisov, S.V., Ipatova, E.N. & Kuklina, E.S. Main structural types of cation matrices of binary niobates and tantalates with the cation ratio 1∶2. J Struct Chem 37, 278–287 (1996). https://doi.org/10.1007/BF02591058
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DOI: https://doi.org/10.1007/BF02591058