Na<sub>4</sub>MgM<sub>2</sub>Se<sub>6</sub> (M = Si,
Ge): The First Noncentrosymmetric Compounds with Special Ethane-like
[M<sub>2</sub>Se<sub>6</sub>]<sup>6–</sup> Units Exhibiting
Large Laser-Damage Thresholds
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Abstract
Two
new noncentrosymmetric compounds, Na<sub>4</sub>MgM<sub>2</sub>Se<sub>6</sub> (<b>I</b>, M = Si; <b>II</b>, M = Ge), that contain
special ethane-like [M<sub>2</sub>Se<sub>6</sub>]<sup>6–</sup> units were reported for the first time. Remarkably, they exhibit
high laser-damage thresholds [9 (<b>I</b>) and 7 (<b>II</b>) × benchmark AgGaS<sub>2</sub>] and moderate second-harmonic-generation
responses with type I phase matching
