Abstract
Many-body interaction potential energy function is used to predict the structural stability and cohesive energy of Molybdenum (Mo) and Tungsten (W) spherical metallic nanocrystals by computer simulations. The model proposed is Ercok's potential energy function comprising two- and three-body terms. The model applies successfully to BCC elements and predicts the size dependence of the cohesive energy of nanocrystals. This prediction agrees with experimental measurements on Mo and W.