LAUSR

Abstract A new noncentrosymmetric (NCS) material, namely, Na 2 GdCO 3 F 3 has been obtained using the hydrothermal method. Na 2 GdCO 3 F 3 exhibits an intricate three-dimensional structure that is composed of NaO 4 F 2 , NaO 2 F 4 and GdO 3 F 6 distorted polyhedra and planar [CO 3 ] triangles. Powder second-harmonic generation (SHG) using the Kurtz−Perry technique shows that Na 2 GdCO 3 F 3 is type I phase-matchable, and the measured SHG coefficient was 2.0 times that of KH 2 PO 4 (KDP). The result from the UV–vis diffuse reflectance spectroscopy study of the powder samples indicated that the short-wavelength absorption edge was below 200 nm, suggesting that Na 2 GdCO 3 F 3 is a promising deep-UV nonlinear optical material.