Oxide semiconductor alloys of x (LiGa O2)12 - (1-x) ZnO were synthesized by a standard solid state reaction. The wurtzite-type single phases were obtained in the wide composition range of x≤0.38 because the Β-LiGa O2 possesses a wurtzite-derived structure and approximately the same lattice constants with ZnO. The resulting alloys showed characteristics of wide band gap oxide n -type semiconductor; the optical transparency reached over to the ultraviolet (UV) light. The electrical conductivity and energy band gap for 0.38 (LiGa O2)12 -0.62ZnO were 8.2 -1 cm-1 and 3.7 eV, respectively, at room temperature. The alloy is a good candidate for the barrier material of the ZnO-based heterostructures and UV-transparent electrodes.