Energy barrier effect on the transient nucleation kinetics is studied. For a high barrier case an advanced interpolation of the "boundary-layer"type is suggested that is valid for the entire time interval. The nucleatin kinetics for the "nucleated cluster"size n_c is described, the lag time estimate for n=n_c is given. For a low barrier case a new "similarity"solution is reported. It is shown that analytical results provide an adegquate description of the transient nucleationkinetics (in comparison with numerical solution of governing equation)for both high-barrier and low-barrier conditions.
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