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

Nan Zhang; Qian-Ting Xu; Zhi-Hui Shi; Mei Yang; Sheng-Ping Guo

doi:10.1021/acs.inorgchem.2c03283

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

Inorg Chem. 2022 Oct 31;61(43):17002-17006. doi: 10.1021/acs.inorgchem.2c03283. Epub 2022 Oct 20.

Authors

Nan Zhang¹, Qian-Ting Xu¹, Zhi-Hui Shi¹, Mei Yang¹, Sheng-Ping Guo¹

Affiliation

¹ School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China.

PMID: 36265201
DOI: 10.1021/acs.inorgchem.2c03283

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.