The present paper reviews some basic problems in the kinetics of nilcleation giving particular attention to the non-st,eady state charachr of this process. The detailed analysis of the mechanism of nucleation makes i t possible to evaluato the influence of active substrates and that of the properties of both the mother and new phases on the magnitude of t.he non-steady state time lag. Some probabilistic aspects of homogeneous and hcterogencous nucleation as well as thc impact, of non-stat,ionary effects on cryst,al growth and overall crystallizat,ioii rat.? are also studied. The theoretical predictions are compared with available cxpcrimrntnl data giving preference to points of methodical interest. T w o expcriment.a.1 examples -tho electrolytic nucleation of mct,als and the catalyzed CI'VStnllixtition of glasses aro considered in more detail.
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