A new acentric barium borate, BaBO(OH)·(HBO)(HO) (), was synthesized via a hydrothermal process. Compound contains two different boron oxide units of [BO(OH)] anions and HBO molecules and features 9-ring channels along the axis in a layered structure. This barium borate is a possible deep-ultraviolet nonlinear-optical crystal for its moderate second-harmonic-generation signal and wide transparency window below 190 nm.
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