Characterizations and Nonlinear-Optical Properties of Pentanary Transition-Metal Oxysulfide Sr2CoGe2OS6

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 P (4) over bar 21m, and its structure features GeOS3 and CoS4 tetrahedra-built {[CoGe2OS6](4-)}(infinity) 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.

Automated summary

This study focuses on a new pentanary oxysulfide material and reveals its moderate nonlinear-optical response and high laser-induced damage threshold. The results suggest that transition-metal oxysulfides can be considered as potential infrared NLO materials.