Configurational Geometry Bridges Equilibrium Structure Information from a Single to Multiple Compositions

Abstract

For classical discrete systems under constant composition, a set of microscopic state dominantly contributing to thermodynamically equilibrium structure should depend on temperature and energy through Boltzmann factor, exp(-bE). Despite this fact, our recent study find a set of special microscopic state that can characterize equilibrium properties, where these structures can be know a priori without any thermodynamic information. Here, for binary system, we extend the theoretical approach to develop a new formulation, where the special microscopic states at a given, single composition can characterize equilibrium structure over whole composition. We demonstrate the validity of the proposed formulation by comparing with results by conventional thermodynamic simulaton. The results strongly indicate that most information about composition- and temperature- dependence of thermodynamically equilibrium structure for disordered state on multiple compositions can be concentrated to a set of special microscopic state on any single composition.