Bibliographic Details
| Title: |
Structure of rubidium–ammonium hexachlorotellurate [Rb0.8(NH4)0.2]2TeCl6 at room and low temperatures |
| Authors: |
Karray, R.1, Kabadou, A.1 AhlemKabadou@lycos.com, Ciśařová, I.2, Hassen, R. Ben1, Salah, A. Ben1 |
| Source: |
Journal of Alloys & Compounds. Sep2004, Vol. 377 Issue 1/2, p85-90. 6p. |
| Subjects: |
Crystals, Rubidium, Spectrum analysis, Low temperatures |
| Abstract: |
The crystal structure of rubidium–ammonium hexachlorotellurate [Rb0.8(NH4)0.2]2TeCl6, has been determined by X-ray single crystal analysis at room and low temperatures (260 K). The space group at both temperatures is Fm&3macr;m with a≈10.2 Å, Z=4. The refinement converged, at room and low temperatures to R=0.021 and 0.011, respectively. The title compound has an antifluorite-type arrangement of NH4+/Rb+ and octahedral TeCl62- anions. At room temperature, the H atoms belonging to ammonium group exhibit a six-fold disorder about [1 1 1]. Decreasing of temperature induces an ordering of NH4+, evidenced by a three-fold H-disorder and a decreasing of the equivalent thermal values. IR and Raman spectroscopic studies at room temperature were performed to confirm results of the X-ray diffraction. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
