On the structural stratification of iron nanoparticles

Abstract

Abstract It is shown that the presence of dispersion of particles with nano-sizes can lead to the appearance of a local phase transition on the surface layer of a sub-granule or a local bcc / fcc phase transition in pure Fe can occur at the intergranular boundary. In the presence of a large size factor, for example, as in Fe- (Mo, W) systems, the magnitude of the static displacements of Fe atoms located at 2–3 coordination spheres relative to the impurity atom, and simultaneously located in the surface / surface layer of the grain, when the critical value of the atomic displacement is exceeded Fe will lead to a violation of the local mechanical stability of the bcc lattice of Fe.