Silicon, as carbons neighbor in the same group of the periodic table, might be hoped that it would also form structures analogous to carbon fullerenes.It is now thought possible that silicon nanostructures with encapsulated metal atoms may lead to applications that could match or even exceed those expected for carbon fullerenes/nanotubes.[1,2] Within the framework of density functional theory, europium, the rare earth element with a large valence shell orbital radii, large atomic magnetic moment and half-filled 4fshell orbital, was found to be an ideal candidate as "guest" to produce carbon-like silicon structures.