Lattice-based models (e.g., cluster expansion ) where the atomic positions are fixed are able to accurately account for the configurational entropy. These models can be combined with Monte Carlo (MC) simulations to perform thermodynamic averages to search for optimal structures. However, the contribution of configurational entropy in the total entropy at the high temperature is sometimes small (≈15% in a previous study ), and vibrational contributions are not generally handled in lattice models . Offlattice models, e.g., interatomic potentials, utilize the details of atomic coordinates for the quantities. MC and molecular dynamics (MD) techniques with the interatomic potentials, e.g., modified embedded atom method (MEAM), are utilized to sample reliable atomic configurations and identify phase stability .