On Mutual Solubility in Submicron-Sized Particles of the Pt–Au Catalytic System

Abstract

The equilibrium phase composition of particles in stratifying solid solutions is a parameter responsible for their catalytic activity. In this work, we used the methods of equilibrium chemical thermodynamics to consider the influence of geometric factors on phase equilibriums in submicron-sized particles with a core–shell configuration in the stratifying Pt–Au system. The particle shape and volume were specified by the effective radius and fractal dimension and used as calculation parameters. The dependence of the mutual solubility of the components on the volume and shape of submicron-sized particles was obtained, and a significant change in the region of compositions of stable solid solutions in particles of different shapes was found.