Abstract
The optimum form and size of 2D nucleus and its formation energy on a singular surface in the case of AB asymmetric bond crystal are formulated. It is concluded that the nucleation characteristics of the system depend not only on the total activity but also on the respective activities of the components in the environment. As a preliminary, a critical comparison is made between the thermodynamical description of the so-called Wulff's theorem and the kinematical description of the Bulgarian school, and the equivalence of the two descriptions is demonstrated in the case of one-component symmetric bond crystal.
