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Characterizations and Nonlinear-Optical Properties of Pentanary Transition-Metal Oxysulfide Sr2CoGe2OS6
Nan Zhang1, Qian-Ting Xu1, Zhi-Hui Shi1
1School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China.
Abstract:
As one type of material containing multiple anions, oxysulfides can combine the advantages of oxides and sulfides and are deeply studied as nonlinear-optical (NLO) materials. Herein, a new melilite-type pentanary oxysulfide Sr2CoGe2OS6 is studied. It crystallizes in the noncentrosymmetric tetragonal space group P4̅21m, and its structure features GeOS3 and CoS4 tetrahedra-built {[CoGe2OS6]4-}∞ layers. Its powder sample exhibits a moderate phase-matchable NLO response and a high laser-induced damage threshold. The NLO response is mainly determined by CoS4 tetrahedra according to the theoretical calculation results. This work indicates that transition-metal oxysulfides can also be considered as potential infrared NLO materials.
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