Relation between Short-Range and Long-Range Order in Solid Solutions with Basal B.C.C. and F.C.C. Structures

A method is proposed to determine the number of nearest coordination spheres in which the presence of limiting short-range order is sufficient to produce long-range order. The use of the method is considered with reference to the example of atomic ordering in solid solutions with b.c.c. and f.c.c. structures. It is suggested that a qualitative dependence exists between the kind of order—disorder phase transition and the relation of short-range and long-range order in the solid solutions involved. [Russian Text Ignored]