کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1623872 1516417 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
DSC, structural single crystal and X-ray powder diffraction study of the ammonium sulfate selenate tellurate mixed solid solution
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
DSC, structural single crystal and X-ray powder diffraction study of the ammonium sulfate selenate tellurate mixed solid solution
چکیده انگلیسی

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) Å, 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 460, Issues 1–2, 28 July 2008, Pages 147–151
نویسندگان
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