INVESTIGATION OF THE ACTIVATION PARAMETERS OF LOW-TEMPERATURE SLIP INANTHRACENE SINGLE-CRYSTALS

In 1990 Kojima and Okada reported their observations on the temperatur e dependence of the yield-stress and of the activation-volume in anthr acene single crystals for (001)[010] and (001)[110] slip systems in th e range 80 to 370 K. Their data have been examined within the framewor k of the kink-pair nucleation model of plastic flow, which was origina lly proposed by Fletham for body-centred cubic metals, and has recentl y been improved and further developed by Butt. The observed interdepen dences of yield stress, activation volume and temperature for anthrace ne single crystals in the range 80 to 200 K are found to be fully expl icable in terms of the model referred to, in which slip is considered to be induced by stress-assisted thermally activated formation of arcs of screw dislocations trapped in Peierls troughs.