Crystal growth, structure and optical properties of a new acentric crystal La2Al4.68B8O22 with a short UV absorption edge

A new acentric borate La2Al4.68B8O22 crystal was synthesized by a solid state reaction and the single crystals were successfully grown with B2O3–LiF flux using the top-seeded solution growth method. The structure of the titled crystal features a two-dimensional layered structure composed of [BO4] and [AlO5] groups that are bridged by the skeletal structure of the [LaO6] polyhedron along the c axis. Optical properties including the transmittance spectrum, IR spectrum and refractive indices have been systematically evaluated for the first time.