Polar model of order-disorder

Abstract

It has been pointed out [2] that the introduction of the more recent concepts of electronic screening in metals applied to the AB alloys leads to a polar model resembling that of Mott [1]. The A and B atoms have opposite charges mainly related to their differences in valence. The ordering energy estimated from the theoretical screening parameters for β brass is in reasonable agreement with experiment, lending support to the physical validity of this model. The basic assumptions and consequences of the model with respect to the ordering energy will be reviewed and in addition an extension of this model to the computation of the electronic contribution to the elastic spectrum of the alloy will be described