Abstract
Second-order nonlinear optical (NLO) materials in the middle infrared (MIR) region have attracted widespread interest in view of their importance and deficiency to the laser market’s requirement. Here, we report a new MIR NLO material Eu8Sn4Se20 (1), which represents a new structure type one and the pioneer of the (MII2MIVQ5)n (MII = divalent alkali-earth metal, Eu, Yb, Pb, and Sn; MIV = Si, Ge, Sn; Q = S, Se, Te. n = 1, 2, 4) family. It demonstrates obvious second-harmonic generation (SHG) activity. Its optical band gap is determined to be 1.30 eV and its magnetic data exhibits antiferromagnetic-type behavior. Its electronic structure is performed as well.
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