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Na4MgM2Se6 (M = Si, Ge): The First Noncentrosymmetric Compounds with Special Ethane-like [M2Se6](6-) Units Exhibiting
Kui Wu1, Zhihua Yang1, Shilie Pan1
1Key Laboratory of Functional Materials and Devices for Special Environments of CAS; Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS , 40-1 South Beijing Road, Urumqi 830011, China.
Abstract:
Two new noncentrosymmetric compounds, Na4MgM2Se6 (I, M = Si; II, M = Ge), that contain special ethane-like [M2Se6](6-) units were reported for the first time. Remarkably, they exhibit high laser-damage thresholds [9 (I) and 7 (II) × benchmark AgGaS2] and moderate second-harmonic-generation responses with type I phase matching.
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