Structural, vibrational and dielectric properties of the new mixed solution K0.84(NH4)1.16SO4Te(OH)6 |
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| Authors: | L Ktari M Dammak A Hadrich A Cousson M Nierlich F Romain T Mhiri |
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| Institution: | aLaboratoire de l'état solide (LES), faculté des sciences de Sfax, 3018 Sfax, Tunisia;bLaboratoire Léon Brillouin, CEA Saclay, 91191 Gif-Sur-Yvette cedex, France;cLaboratoire de dynamique, interactions et réactivité, CNRS, 2, rue Henry Dunant, 94320 Thiais, France |
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| Abstract: | Synthesis, crystal structure, DSC characterization, dielectric and Raman measurements are given for a new mixed solution K0.84(NH4)1.16SO4Te(OH)6 (KNST). X-ray studies showed that the title compound crystallizes in the monoclinic system (P21/c) with the following parameters: , , , β=120.17(2)° and Z=4. The structure can be regarded as being built of isolated TeO6 octahedra, SO4 tetrahedra and cations. The main feature of this structure is the coexistence of two types of hydrogen bonds OHO and NHO ensuring the cohesion of the crystal. Crystals of K0.84(NH4)1.16SO4Te(OH)6 undergo two endothermic peaks at 425 and 480 K and a shoulder at 470 K. These transitions detected by DSC and analyzed by dielectric measurements using the impedance and modulus spectroscopy techniques. Raman scattering measurements on K0.84(NH4)1.16SO4Te(OH)6 material taken between 300 and 620 K are reported in this paper. The spectra indicate clearly two phase transitions. |
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