Structure and Characterization of the [Rbx (NH4)1-x]2TeCl6 Tellurate Family at Room Temperature |
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Authors: | H Belgaroui M Loukil R Karray A Ben Salah and A Kabadou |
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Institution: | (1) Institute for Materials Science, Darmstadt University of Technology, Petersensstrasse 23, 64287 Darmstadt, Germany;(2) Laboratoire des Sciences des Mat?riaux et d’Environnement, Facult? des Sciences de Sfax, Sfax, 3018, Tunisia |
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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 Fm3m with the lattice parameter a = 10.2503(5) ? and Z = 4. The refinement converged to R(F) = 0.015 and wR(F
2) = 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 TeCl26 octahedra ensuring the stabilization of the structure by ionic and hydrogen bonding contacts N-HCl. 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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