Kinetic investigations within the transition region from polyhedral to skeletal growth mode (IV). Comparison between the kinetic critical size and the observed morphological size of the basal face of zinc single crystals

Abstract

AbstractThe growth of zinc single crystals in a kinetic and a diffusion regime at argon pressures 5 – 250 Torr has been investigated. The growth of the edge of the basal face has been studied as a function of time at constant supersaturation and temperature of the furnace, simultaneously observing the surface of the {0001} face. It was established that in a kinetic growth mode the single crystals retained their polyhedral shape, whereas in a diffusion regime their form was changed into skeletal. A comparison was made between the critical size at which the transition from a kinetic to a diffusion regime began and the size at which a visible depression appeared on the {0001} face. In fact, the transition from a kinetic to a diffusion regime occurs simultaneously with the loss of the morphological stability of the basal face at kinetic critical sizes ak and Rk.