Abstract
In the last years, intermetallics with L1 2-structure were of particular interest, both from the point of view of their fundamental properties and their practical application as materials with excellent chemical, mechanical and physical properties. In the present investigation, we have chosen Ni 3Ga as a model L1 2 compound to study (1) the equilibrium degree of order at various temperatures and (2) the kinetics of ordering and disordering. In this paper we report the method of estimating the long-range order parameter from the resistivity data and how to derive the effective pair interaction (EPI) energy. It is then compared with those evaluated from thermodynamic activity measurements and also with those converted from Compound Energy Formalism (CEF) and CALPHAD modelling. Such adequately evaluated EPI energy values can be conveniently employed for calculating point defect concentrations at various temperatures and compositions using common statistical-thermodynamic methods, as a Bragg–Williams model.
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