Abstract
We have analyzed and tabulated the variants of mutual ordered arrangements of cations of two types with 1∶1 stoichiometry in cation matrices having planar trigon 36 nets. A net with two nodes in its unit cell has a sole variant, which occurs in the wolframite type structure. With four nodes in the cell, there are two variants: the scheelite type and the variant found in α-and β-LaTaO4. With 6 nodes, there are six, and with 8 nodes, more than 20 variants. In the ABO4 (A=REE, B=Ta Nb) structural type (M'-fergusonite, fluorite, α-LaTaO4, β-LaTaO4, and fergusonite) having a more or less distorted face-centered cubic cation subcell in common, we have the wolframite type of arrangement for M'-fergusonite and fluorite, the scheelite type for fergusonite, and the partly scheelite type for α-and β-LaTaO4. We offer a system for representing the atomic arrangement by recording the alternation of atoms in linear rows of three directions.
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Institute of Inorganic Chemistry, Siberian Branch Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 35, No. 6, pp. 129–135, November–December, 1994
Translated by T. Yudanova
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Borisov, S.V., Ipatova, E.N. Variants of cation arrangement in the 36 net of tantalates and niobates with 1:1 stoichiometry. J Struct Chem 35, 865–870 (1994). https://doi.org/10.1007/BF02578119
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DOI: https://doi.org/10.1007/BF02578119