X-ray powder diffraction,vibration and thermal studies of [A0.92(NH4)0.08]2TeCl4Br2 with A = Cs,Rb: Influence of mixed cationic and anionic substitutions |
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| Authors: | W Ben Aribia M Abdelmouleh A Kabadou A Van Der Lee |
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| Affiliation: | 1. Laboratoire des Sciences des Matériaux et de l’environnement, Université de Sfax, Faculté des Sciences de Sfax, 3018, Tunisia;2. Institut Européen des Membranes (UMR 5635), Université de Montpellier II, cc 047, Place E. Montpellier, France;1. Far-Eastern Federal University, Russian Federation;2. Institute of Chemistry, Far-Eastern Branch, Russian Academy of Sciences, Russian Federation;1. Department of Physics, Faculty of Sciences, Gazi University, 06500 Ankara, Turkey;2. Department of Physics, Faculty of Arts & Sciences, Düzce University, 81620 Düzce, Turkey;1. Department of Physics, Faculty of Science, Universiti Teknologi Malaysia (UTM), 81310 Johor Bahru, Malaysia;2. Department of Physics, College of Science and Arts, King Abdul Aziz University, Rabigh 21911, Saudi Arabia;3. Nuclear Malaysia Agency, 43000 Kajang, Selangor, Malaysia;1. Department of Physics, Deenbandhu Chhotu Ram University of Science and Technology, Murthal 131039, Haryana, India;2. Department of Applied Physics, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, India |
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| Abstract: | The crystal structures of A0.92(NH4)0.08]2TeCl4Br2 with A = Cs, Rb have been determined using X-ray powder diffraction techniques. The two compounds crystallize in the tetragonal space group P4/mnc, with the unit cell parameters: a = 7.452(1) Å, c = 10.544(3) Å, Z = 2 and a = 7.315(2) Å, c = 10.354(4) Å, Z = 2 in the presence of Cs and Rb, respectively. These two compounds have an antifluorite-type arrangement of NH4+/Rb+/Cs+ and octahedral TeCl4Br22? anions. The stability of these structure is by ionic and hydrogen bonding contacts: A?Cl, A?Br and N–H?Cl, N–H?Br. The different vibrational modes of these powders were analysed by FTIR and Raman spectroscopic studies. A DTA/TGA experiment reveals one endothermic peak at 780 K implicating the decomposition of the sample. At low temperature, one endothermic peak in thermal behavior is detected at around 213 K by DSC experiment. This transition was confirmed by dielectric measurements. |
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