Abstract

The phase diagram of the order-disorder transformation in binary alloys A x B 1−x with bcc structure is calculated using the pair approximation of the Cluster Variational Method (CVM). Nearest (NN) and next-nearest neighbor (NNN) interactions are considered. Two types of pairs are taken into account: short pairs for the NN and long pairs for the NNN. The results of our calculation are compared with the CVM tetrahedron approximation and Monte Carlo Simulations (MCS)

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