Abstract
We propose an electronic model for the growth of long-range chemically ordered binary compounds. By varying one parameter, we show that a specific concentration can be dynamically selected and the associated chemical order propagated during a rapid solidification. The basic assumptions of the model are: 1) the diffusion inside the growing structure is frozen out, and 2) the «chemical» reconstruction at its surface remains free to occur. In a first step, we study two one-dimensional models and show that both periodic- and quasi-periodic structures can be built-up one atom at a time, using an energetic rule of growth. The first model is phenomenological and includes classical interactions between the atoms, the second is a tight-binding model including quantum effects
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