Structure and characterization of the [Rbx(NH4)1-x]2TeCl6 tellurate family at room temperature
H. Belgaroui, M. Loukil, R. Karray, A. Ben salah, A. Kabadou
Keywords: antifluorite type, dynamic motion, substitution, Raman and IR spectroscopy
Pages: 717-722
Abstract
The crystal structure of rubidium-ammonium hexachlorotellurate [Rb0.94(NH4)0.06]2TeCl6 was determined by X-ray single crystal analysis at room temperature. The space group is Fmm with the lattice parameter a = 10.2503(5) Å and Z = 4. The refinement converged to R(F) = 0.015 and wR(F2) = 0.032. As in the studied [Rb0.94(NH4)0.06]2TeCl6 family, this compound has an antifluorite-type arrangement. Tellurium atoms are surrounded by an octahedron of chlorine atoms. The Rb or N atoms are located between TeCl octahedra ensuring the stabilization of the structure by ionic and hydrogen bonding contacts N-H…Cl. The substitution of rubidium by ammonium groups does not affect the structural arrangement, but it leads to a decrease in the a lattice cell dimension. IR and Raman spectroscopic studies at room temperature were performed to confirm the X-ray crystallographic results.
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