BaV2O6•H2O: A nonlinear optical crystal with a large bandgap

The first Ba-containing hydrated vanadate as nonlinear optical (NLO) material, BaV2O6 center dot H2O, was synthesized by facile hydrothermal method. The single-crystal X-ray diffraction result shows that this compound crystallizes in the acentric orthorhombic space group of P2(1)2(1)2(1) with cell parameters a = 7.3993(6) angstrom, b = 8.9934(7) angstrom, and c = 9.7206(8) angstrom. UV-vis-IR diffuse reflectance spectrum shows that the compound has a large bandgap of 4.60 eV and moderate transparency range. The title compound shows second-harmonic generation (SHG) efficiency about 0.5 times of KH2PO4 (KDP). The structure-property relationship of BaV2O6 center dot H2O was clarified by the first-principles studies.