The thallium tungstate Tl _{2}W _{4}O _{13}: A tunnel structure related to the hexagonal tungsten bronze
Abstract
The crystal structure of thallium tungstate Tl _{2}W _{4}O _{13} ( a = 7.327Å; b = 37.864 Å; c = 3.840 Å; space group Pmab) has been resolved by threedimensional singlecrystal Xray analysis. The average structure was resolved by standard Patterson and Fourier techniques and refined by fullmatrix least squares to final agreement indices R = 0.087 and R_{w} = 0.100. Superstructure reflections referred to a supercell ( a, b, 2 c; space group Pcab) led to a framework model which is described. The structure consists of cornersharing chains of WO _{6} octahedra parallel to a and c axes. Hexagonal and pentagonal tunnels, bound by these chains, are filled by thallium atoms. The atomic arrangement is closely related to the hexagonal bronze structure. The tungstate Tl _{2}W _{4}O _{13} can thus be considered as a member of a series of phases (Tl B_{3}X_{9}) _{n} · Tl _{6}B_{10}X_{34} ( X = O, F) involving hexagonal tungsten bronze ribbons.
 Publication:

Journal of Solid State Chemistry France
 Pub Date:
 December 1979
 DOI:
 10.1016/00224596(79)902421
 Bibcode:
 1979JSSCh..30..311G