Abstract
Abstract We present the first optimized random-phase (ORPA) calculation for the structure of liquid binary alloys, with an application to K-Rb and K-Cs alloys. We show that the inclusion of the medium- and long-range forces in the ORPA yields a marked improvement over calculations based on hard-sphere mixtures or soft repulsive forces only. However, for larger size differences and non-additive pairpotentials, the random-phase approximation produces a singularity in the partial structure factors, which is not completely eliminated through the optimization process.
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