Bibliographic Details
| Title: |
The effect of the combined substitution of NH4 + and Cl− on the structure of [Cs0.8(NH4)0.2]2TeBr5.6Cl0.4 powder |
| Authors: |
Belgaroui, H.1, Loukil, M. m.loukil@yahoo.fr, Karray, R.1, Ben Salah, A.1, Kabadou, A.1 |
| Source: |
Journal of Alloys & Compounds. Jun2010, Vol. 499 Issue 2, pL5-L8. 0p. |
| Subjects: |
Molecular structure, Cesium, Rietveld refinement, Ammonium ions, Hydrogen bonding, Chlorine, Powder metallurgy, X-ray diffraction |
| Abstract: |
Abstract: The structure of [Cs0.8(NH4)0.2]2TeBr5.6Cl0.4 has been determined from conventional X-ray powder diffraction data, by Rietveld method, in Fm−3m cubic space group [a =10.6798(6)Å, Z =4] and was further investigated by IR spectroscopy. The refinement of the structure led to final factor χ 2 =0.068. The studied [Cs0.8(NH4)0.2]2TeBr5.6Cl0.4 compound has an antifluorite-type arrangement. The tellurium atoms are surrounded by a disordered of chlorine or bromine atoms octahedron. The Cs or N atoms are located between the octahedral ensuring the stability of the structure by ionic and hydrogen bonding. Two endothermic peaks in thermal behaviour were detected for this compound at 328K and 461K, by DSC experiment. An IR spectroscopic study is employed as a means to obtain preliminary structural information and shows the presence of the NH4 + groups. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
