Synthesis, structure and physicochemical characterization of a noncentrosymmetric, quaternary thiostannate: EuCu2SnS4

摘要

EuCu2SnS4 Was prepared by a stoichiometric combination of the elements heated to 700 degrees C for 125 h. The structure was determined by single crystal X-ray diffraction methods. The compound crystallizes in the noncentrosymmetric, orthorhombic space group Ama2 with a = 10.4793(1) angstrom, b = 10.3610(2) angstrom, c = 6.4015(1) angstrom, Z = 4, R1 = 0.99% and wR2 = 2.37%. The structure type is that of SrCu2GeSe4. The structure can be described as a three-dimensional network built from near perfect SnS4 and distorted CuS4 tetrahedra together with EuS8 square antiprisms. The dark red compound is a semiconductor with an optical bandgap of 1.85 eV. (C) 2008 Elsevier Inc. All rights reserved.