Both short-range order (SRO) and long-range order (LRO) have been investigated in Cu-Pt alloys at various temperatures and compositions by means of the electrical resistivity measurement technique. It can be shown that stable long-range-ordered equilibrium states can be achieved by thermal treatment. The effects of SRO and LRO can be separated for the nonequiatomic compositions by taking advantage of the different characteristics of the resistivity change on short-range and long-range ordering.

• Received 5 October 1987

DOI:https://doi.org/10.1103/PhysRevB.37.6027