Ternary Mixed-Metal Cd4 GeS6 : Remarkable Nonlinear-Optical Properties Based on a Tetrahedral-Stacking Framework

Inorganic Chemistry
Meng-Yue LiQi-Long Zhu

Abstract

Noncentrosymmetric (NCS) mixed-metal chalcogenides have attracted significant attention lately because of their structural multiplicities, strong second-harmonic-generation (SHG) efficiencies ( d ij) and large laser-induced damage thresholds (LIDTs), which make them promising nonlinear-optical (NLO) materials in mid- and far-IR (MFIR) applications. In this work, a ternary mixed-metal material, Cd4GeS6, has been synthesized by reacting CdS with GeS2 via a solid-state method at 1273 K. It exhibits a unique tetrahedral-stacking NCS framework structure consisting of two types of [Cd2S7] asymmetric groups and dispersed GeS4 tetrahedra. Remarkably, Cd4GeS6 shows type-I phase-matching ability and achieves a desired balance between strong d ij (about 1.1AgGaS2) and large LIDT (about 3.6AgGaS2), demonstrating that this material satisfies the essential requirements as a promising MFIR NLO candidate. Moreover, theoretical calculations were performed for a better understanding of the structure-property relationships.

References

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Feb 7, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Guang-Mao LiShi-Lie Pan
Dec 9, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Hong ChenXin-Tao Wu

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