A non-centrosymmetric fluoride borate, Ba3Sr4(BO3)3F5, has been synthesized by solid state reaction techniques, and a single crystal was grown by the top-seeded solution growth method using NaF as flux. Single-crystal X-ray diffraction analysis shows the structure to be hexagonal with space group P63mc(No. 186) and the following cell parameters: a= b= 10.8953(16) Å, c= 6.9381(15) Å, and Z= 2. It exhibits an intricate 3-dimensional framework of interconnecting Ba(1)O(1)3O(2)4F(2) polyhedra, Sr(1)O(2)4F(1)2F(3) polyhedra, Sr(2)O(2)6F(1)3F(3) polyhedra, and isolated BO3triangles. The infrared spectrum indicates that the Ba3Sr4(BO3)3F5crystal contains characteristic BO33−groups as its basic structural units, which is consistent with the crystallographic study. The transparency spectrum shows that the as-grown crystal is transparent in the wavelength range of 270 to 2550 nm, the highest transmittance exceeds 85%, and the UV cutoff wavelength is about 210 nm.The thermal analysis shows that it is chemically stable and melts congruently at 1174.3 °C. [ABSTRACT FROM AUTHOR]