Abstract
Surface properties of transition metals can be modified considerably byforming carbide overlayers. In this study we fabricated molybdenumcarbide overlayers by carburizing the Mo(110) surface with ethylene(C2H4) and successfully determined their real space structures by using low energy electrondiffraction (LEED) and scanning tunneling microscopy (STM). With various carburizationrecipes, three carbon-terminated structures , (12 × 4)-2C,and (4 × 4) ofcoverages 1/30,1/24, and 1/16 monolayer (ML) were formed on the surface, respectively. Since the carbide overlayers wereformed at high temperatures, inward diffusion of carbon atoms played a key role instructure formation.
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