Abstract
The equilibrium atomic distributions in the off-stoichiometric Cu–Au alloys whose high and low temperature phases are of the long period superlattice (LPS) and the Ll 0 (CuAu) structures respectively are investigated on the basis of the mean field theory. The obtained results are as follows. LPS with uniformly distributed excess atoms are generally unstable against the modulation of the concentration of excess atoms along the direction perpendicular to antiphase boundaries. The period of the concentration modulation (CM) is a half of that of LPS and its phase shows that excess atoms enter into sites at antiphase boundaries preferentially. CM produced by LPS increases the stability of LPS and sometimes LPS becomes stable only by accompanying CM.
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