Atomic Distribution in Binary Solid Solutions III. Diffuse Scattering of X-rays by Binary Alloys

Abstract

The theory of diffuse scattering of X-rays by binary alloys is developed, based on the pair distribution functions of atoms which have been given in the previous parts of this series and which are entirely similar to those appear in the theory of imperfect gases. These distribution functions enable us to perform the theoretical calculation of the distribution of the diffuse intensity of scattered X-rays due to the short range order at the temperature above the critical temperature, and the calculations are carried out both for the case of the order-disorder systems and for the two-phase separation systems. The disk-like shape of the diffuse maxima observed for Cu₃Au is predicted from this theory. And it seems that such anomalous shape does not appear in the case of two-phase separation system.