“…In this paper, both the formation and migration energies of a single Mo or Ta vacancy diffusion intra-and inter-layer in an extension region of MoTa (0 0 1) surface have been investigated by using the many-body potential model of the modified analytical embedded-atom method (MAEAM) modified by Zhang et al [10,11] from the analytical embedded-atom method (AEAM) of Johnson [12]. In our previous papers, the MAEAM has been used successfully to investigate the surface adsorption [13,14], surface segregation [15], surface energy [16,17], interface energy [18,19] and grain boundary energy [20][21][22][23][24] as well as the bulk diffusion in a few alloy systems [25][26][27].…”