| Abstract: | The formation of higher aggregates of IV-dipoles consisting of a divalent impurity ion and a cation vacancy is investigated by the simulation of their random motion in a model lattice at different annealing temperatures. An interaction potential between the sink for the dipoles and the dipole in the lattice is assumed. Additionally a decay of the sink is allowed. The results show, that already two dipoles (i.e. a dimer) from a stable aggregate. This is in agreement with theoretical calculations of the equilibrium concentrations of higher aggregates and the results of kinetic measurements of dipole aggregation. The reason is the relative high binding energy of dipoles in alkali halide crystals. |
