New potential stable structures of XMg (X = Ge, C, Sn; n = 2-12) clusters: XMg with high stability.

Several potential stable structures of X-doped magnesium (X = Ge, C, Sn) clusters have been fully investigated by using CALYPSO structure searching software together with density functional theory calculations. XMg (X = Ge, C, Sn; n = 3-7) clusters have similar geometric structure grows in tetrahedron, while the structures of XMg (X = Ge, C, Sn; n = 8-12) are based on a kind of tower-like geometry. Interestingly, the relative stability computations indicate that XMg (X = Ge, C, Sn) are more stable than other clusters, and thus can be identified as magic clusters.