DSC, structural single crystal and X-ray powder diffraction study of the ammonium sulfate selenate tellurate mixed solid solution

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作者：
Abdelhedi, M. [1 ,2 ]
Ktari, L. [1 ]
Dammak, M. [1 ]
Cousson, A. [2 ]
Kolsi, A.W. [1 ]
机构：
[1] Laboratoire de l'Etat Solide (LES), Faculté des Sciences de Sfax, BP 802, 3018 Sfax, Tunisia
[2] Laboratoire Léon Brillouin, CEA-CNRS, Saclay, 91191 Gif-Sur-Yvette Cedex, France
来源：
Journal of Alloys and Compounds | 2008年 / 460卷 / 1-2期
关键词：
Crystal structure of (NH4)2(SO4)0.73(SeO4)0.27Te(OH)6 (NSSeTe) crystallizes in the monoclinic P21/c space group. It was analyzed at room temperature using X-ray diffractometer data. The unit cell parameters are a = 13.7340(2) Å; b; 6.6583(1); Å; c; 11.4582(2); β; 106.8270(6)°; Z; 2; V; 1002.93(3); Å3; R; 0.014; Rw = 0.017 and Dx = 2.426 g cm-3. The main feature of this atomic arrangements is the coexistence of three and different anions (SO42-; TeO66- and SeO42- groups) in the unit cell; connected by hydrogen bonds which make the building of the crystal. The distribution of atoms can be described as isolated TeO6 octahedra and SO4 and/or SeO4 tetrahedra occupying the same positions. The NH4+ cations; are located between these polyhedra. The molecular species present in the lattice are S/SeO42- tetrahedra and TeO66- octahedra disposed in a number of sheets. The thermal analysis of the title compound show three distinct endothermal peaks at 398; 430 and 450 K. X-ray powder diffraction data at different temperatures confirm that the first anomaly at 398 K can be attributed to a structural phase transition. © 2007 Elsevier B.V. All rights reserved;
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页码：147 / 151
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