MoSi2 thin films deposited on the alumina substrate had a hexagonal crystal structure, contrary to the tetragonal Fig. 1. Schematic drawing of apparatus for thin film deposition by RF magnetron sputtering.one of the target material, under all conditions. However,the orientation changed greatly with the sputtering conditions.It was found that sputtering conditions strongly affected the deposited MoSi2 thin film. The XRD patterns are shown in Fig. 2. The compositions were close to Mo:Si=1:2, which is the stoichiometric composition ratio,under all conditions. Furthermore, it has been reported that when a thin film is deposited by sputtering using Ar gas, it often has the so-called column structure, where all the crystals inside the thin film are arrayed in columns on the substrate [3, 4]. It was confirmed from SEM images that the MoSi2 thin films deposited on the alumina substrate also had the column structure.