Figure 4

(a) Formation energies of the most stable BN clusters and boron sheet in vacuum and on Cu(111) surface. (b) The Gibbs free energy of Cu supported boron clusters as a function of cluster size.
(a) Formation energies of the most stable BN clusters and boron sheet in vacuum and on Cu(111) surface. (b) The Gibbs free energy of Cu supported boron clusters as a function of cluster size.