The study of alloy and compound sputtering is very important to applications of material sputtering phenomena and to the theory of atomic collision. The surface layer compositional change of sample under sputtering is an interesting one of many sputtering phenomena. In order to observe this phenomenon and to study its characteristic
we selected the ternary alloy system Si(Co
Ta). The samples were sputtered individually with 20—80 keV Ar
+
ions. Then we studied how the surface large compositional change had depended on the energy of Ar