COMPARISON OF 2 ANALYTICAL APPROXIMATIONS FOR CALCULATION OF THE SHORT-RANGE ORDER IN DISORDERED ALLOYS

Both analytical and numerical comparative studies of two high-accuracy approximations elaborated recently by Tokar et al. (J. Phys.: Condens . Matter, 1990, 2, 10199) and by Chepulskii and Bugaev (Solid State Co mmun.,1998, 105, 615) for calculation of the short-range order paramet ers in binary disordered alloys are performed. It is shown that, under additional assumptions, one of these approximations may be presented in a form analogous to that of the other approximation. By means of co mparison with the results of the Monte Carlo simulation, the approxima tion which demonstrates the higher numerical accuracy in actual alloys with long-range characters of atomic interactions is found. (C) 1998 Elsevier Science Ltd. All rights reserved.