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We explore the possibility of modifying the multiplicity of the basic clusterin the entropy functional used in the cluster variation method so thattruncation errors owing to finite size of the basic cluster may be corrected.The numerical value of this multiplicity is found by requiring the modified CVMentropy functional (M-CVM) in the tetrahedron approximation for thebody-centered cubic structure to yield the exact critical temperatures forordering and phase separation. We demonstrate that very accurate values of theorder parameter, correlation functions and the Gibbs function can be obtainedfor ordered and disordered phases at arbitrary composition and temperature withM-CVM approach by comparing the results with those for Monte Carlo simulations.

An Improved CVM Entropy Functional for BCC Alloys