A nonlinear-optical crystal BaZn(BO) (BZBO) is obtained that is constructed with [Zn(BO)O] units bridged by planar BO groups along the a axis based on the flexibility of the BO and ZnO groups. The distance between adjacent [Zn(BO)O] layers in BZBO is 5.07 Å, which is much shorter than those of KBeBOF, BaZn(BO), and NaCsBeB5O. The smaller interlayer spacing and stronger bond between neighboring layers of BZBO contribute to a better growth habit than those of the other three. Also, with the cooperation of two kinds of nonlinear-optical active groups, BO and ZnO, BZBO exhibits a large second-harmonic-generation response of about 2.6 times that of KDP.
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