Effective Pairwise Potentials in Copper-Gold Alloys

概要

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The improved statistical mechanical approximation developed by one of us ins applied to the analysis of published experimental data on the short range order parameters in, and the diffuse X-ray scattering intensities from, the three stoichiometric copper gold binary alloys Cu_3Au, CuAu and CuAu_3. From this analysis, the corresponding effective pair-wise interparticle potentials extending upto the third nearest neighbor separation are determined. Using a plausible interpolation procedure, from these results for the three stoichiometric compositions, effective pair-wise interparticle potentials are estimated for all compositions in the range Cu_3Au to CuAu_3. Finally, using these estimates, the variation of the magnitude of the order-disorder transition temperature, T_c, as a function of the system concentration is predicted. These predictions are then compared with the experimental data of Rhines, Bond and Rummel. The agreement of the theoretical predictions with the experimental data T_c is found to be excellent in the range Cu_3Au to CuAu and, in particular, the observed minimum in T_c for the composition Cu_<0.64Au_0.36 is faithfully reproduced.
社団法人日本物理学会の論文
1971-09-05