Acta Cryst. (2007). E63, i116-i118  [ doi:10.1107/S1600536807015073 ]

Redetermination of SrTe₃O₈ from a hydrothermally grown single crystal

M. Weil and B. Stöger

Abstract: The crystal structure of the mixed-valence tellurium compound strontium ditellurate(IV) tellurate(VI) was redetermined from single-crystal data. The previous structural model, determined ab initio from powder X-ray diffraction data [Barrier et al. (2006). J. Solid State Chem. 179, 3484-3488], was confirmed, but with all atoms refined with anisotropic displacement parameters and with differences in individual Te-O bond lengths up to 0.05 Å. The structure is composed of [Te₃O₈]^2- chains that extend parallel to [001] and [110] to form a channel structure. Whereas one half of the channel is occupied by the Sr atoms in an eightfold coordination, the other half remains unoccupied, with the electron lone pairs of Te^IV protruding into the empty space. Except for one O atom, all other atoms are on special positions: Sr (.. symmetry), Te1 (m..), Te2 (2/m..), O1 (m..) and O2 (m..).

Online 13 April 2007

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