Abstract
AbstractAny interaction between segregating atoms and/or between segregating and matrix atoms can lead to two-dimensional long-range order (LRO) within the segregated layer if the temperature is low enough. Long-range order has a strong influence on the segregation isosteres; it can eventually introduce completely new phenomena such as phase separation. It is studied within the framework of the Ising model using exact series expansions. Segregation isosteres are given for various bulk concentrations, values of segregation, and interaction enthalpies both for ‘ferromagnetic’ LRO (attractive interaction between like atoms) and ‘antiferromagnetic’ LRO (attraction between unlike atoms). Asymptotic formulae for some limiting cases and a simple procedure to extract the values of the parameters from certain experiments are described, and a comparison with experimental results is shown to yield consistent thermodynamic data.
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