| Abstract: | It was investigated from (L0/L)2 versus ϕ0 curve that the Friedel relation between the effective stress and the average length of dislocation segments, L, is appropriate for the interaction between a dislocation and the monovalent anion in various alkali halides single crystals (NaCl: Br‐, NaBr: Cl‐ or I‐, KCl: Br‐or I‐, and RbCl: Br‐ or I‐). Here, L0 represents the average spacing of monovalent anions on a slip plane and ϕ0 is the bending angle at which the dislocation breaks away from the anion at the temperature of 0 K. This is because the anions are the weak obstacles such as impede the dislocation at ϕ0 above about 150 degrees, where the Friedel relation agrees with the Fleischer one (L02 = L2(π–ϕ0)/2). Furthermore, the values of (L /L0) were found to be within 4.05 to 5.87 for the crystals. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
