Surface Science, February 2012, Vol.606(3-4), pp.456-460
We studied the atomic arrangements and the phase diagram of two-dimensional (2D) Bi–Sn binary films on Rh(111) with low-energy electron diffraction and scanning tunneling microscopy (STM). The 2D binary films exhibited (“2”×√3)-(Bi,Sn), (√7×√7)R19°-(Bi,Sn), and (7×3√3)-(Bi,Sn) structures, depending on the compositional ratio of Bi and Sn. Atomically resolved STM images revealed that the binary films formed a BiSn3 ordered alloy for the (√7×√7)R19°-(Bi,Sn) structure and a solid solution alloy for the (“2”×√3)-(Bi,Sn) structure. The atomic configuration for the (7×3√3)-(Bi,Sn) structure was closely related to that of (√7×√7) R19°-(Bi,Sn). ► The 2D solid solution alloy was formed when Sn compositional ratio is above 80%. ► The 2D film changed from twofold to sixfold structures as Bi composition increased. ► The 2D ordered alloy of BiSn3 was formed on Rh(111).
2d Film ; 2d Film ; Chemistry ; Physics
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