  In our recent works, we used a nearest-neighbor broken bond (NNBB) model to
fit the surface energy of Pt, Pd, and Au surfaces [Adv. Theory Simul. 1800127
(2018)]. It was verified that this model could describe the surface energies of
above noble metals with high accuracy. The applications of this model in
real-time simulations of equilibrium nanocrystal transformations are in good
agreements with the experimental observations at macroscopic time scales
quantitatively. In this work, we want to further verify the generality of the
NNBB model for other transition metals. All surface tentions and lattice
constants were extracted from the database of Materials Project. The number of
missing NN bonds of different slabs from low-index surfaces to open surfaces
were counted for both surface atoms and subsurface atoms. As presented below,
linear relationships between surface energies and missing bonds number are
found for all studied elements. The bond energies for different metals are
obtained through fitting NN bonds and surface energy of different surfaces.
