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The 3×3R30° structures of 2-D nickel silicide and nickel germanide surface alloys on Ni(111) were investigated using quantitative low-energy electron diffraction analysis. The unit cells of the determined silicide and germanide structures contain two Ni atoms and one Si or Ge atom, corresponding to the chemical compositions Ni2Si and Ni2Ge, respectively. Both the Si and Ge atoms adopt substitutional...
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