Abstract
A new compound β-Tl6Si2O7 has been investigated using the methods of IR spectroscopy and microprobe and X-ray diffraction analysis. The elementary unit parameters were as follows: P63/m, a = 9.673(2) Å, c = 3.9169(9) Å, and V = 317.4(1) Å3. The structure was resolved by direct methods and corrected until R 1 = 0.029 (wR 2 = 0.047) for 240 reflections [F o] ≥ 4σ F . The crystal structure of β-Tl6Si2O7 contains one symmetrically independent position of the Tl+ cation that forms three short (〈Tl-O〉 = 2.54 Å) bonds and one weak bond (2.93 Å) with the oxygen atom. One can observe a strong disordering of silicon atoms (Si-Si = 0.64 Å). The distorted tetragonal pyramids TlO4 are linked through silicate tetrahedra into a three-dimensional framework. The interesting feature of the crystal structure of β-Tl6Si2O7 is in the presence of wide channels occupied by lone electron pairs on Tl+ cations. One can also mention that in most of the structures of Tl+ oxygen-containing salts the lone pairs are associated into separate parts in the form of micelles in channels of frameworks or other structural cavities.
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Original Russian Text © O.I. Siidra, S.N. Britvin, S.V. Krivovichev, D.A. Klimov, W. Depmeier, 2012, published in Fizika i Khimiya Stekla.
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Siidra, O.I., Britvin, S.N., Krivovichev, S.V. et al. Synthesis and crystal structure of the disordered modification of Tl6Si2O7 . Glass Phys Chem 38, 473–477 (2012). https://doi.org/10.1134/S1087659612060053
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DOI: https://doi.org/10.1134/S1087659612060053