Decoupling atomic diffusion degeneracy in L12 intermetallics

Abstract

In this work, a degenerate diffusion state is identified for common L12 intermetallics in well-defined five-frequency model (FFM) and anti-site bridge model (ASB). The relative energy barrier [Formula: see text] ([Formula: see text] in FFM and [Formula: see text] in ASB) of the degenerate state serves as a decomposer which not only bifurcates the degenerate pathways, but also determines the most probable diffusion model. The diffusion coefficients obtained from the most probable diffusion model coincides the experimental value. We find the proposed decomposer complies with the Onsager phenomenological theory and atomistic correlation understanding, and is also supported by the relative work [Formula: see text] done by electronic wind force.

Keywords

• Diffusion model
• L12 intermetallics
• degenerate state
• decoupling rule