SUPERSTRUCTURES FORMED BY Ga ATOMS ON Ni (111) SURFACE
Ga在Ni(111)表面上形成的超结构

The structures of Ga atoms deposited on Ni(lll) surface was studied. When the coverage is less than one monolayer, two superstructures. (3(1/2)×3(1/2)) R30°and (2×2), have been observed, by means of LEED and AES.A quasi-equilibrium phase diagram has been drafted, and thus the rangs of coverage and temperature while these superstructures appear can be estimated.