No abstract

Single crystals of Li 3 Cs 2 B 5 O 10 have been synthesized and its structure determined by single-crystal X-ray diffraction. Li 3 Cs 2 B 5 O 10 crystallizes in the non-centrosymmetric space group C222 1 (No. 20). The structure consists of isolated B 5 O 10 groups that are bridged by LiO n (n ¼ 4, 5) and CsO n (n ¼ 8, 10) polyhedra through their vertex oxygen atoms to form an infinite three-dimensional structure. Li 3 Cs 2 B 5 O 10 melts congruently and exhibits a short-wavelength absorption onset at 175 nm. As-prepared Li 3 Cs 2 B 5 O 10 is both non-centrosymmetric and phase matchable as supported by second harmonic generation measurements.

A new noncentrosymmetric borophosphate, Na(3)Cd(3)B(PO(4))(4), has been successfully synthesized by conventional solid state reaction for the first time. It crystallizes in the orthorhombic space group Pmc2(1) with unit cell parameters of a = 13.6854(3) Å, b = 5.3346(11) Å, c = 18.2169(4) Å, and Z = 4. Na(3)Cd(3)B(PO(4))(4) features zero-dimensional [B(PO(4))(4)](9-) anion units with Cd(2+) and Na(+)/Cd(2+) cations located around them, in which the BO(4) tetrahedron is surrounded by four PO(4) tetrahedra by sharing the vertexes of O atoms. Second harmonic generation (SHG) measurements show that Na(3)Cd(3)B(PO(4))(4) exhibits a SHG response 1.1 times larger than that of KH(2)PO(4) (KDP) and is phase matchable.