+defect structures were described by both methods.
+the interstitial carbon mmigration path was identified.
+it turned out that the the diffusion barrier is drastically overestimated
+within the ea description.
+
+combinations of defects were investigated by first principles methods.
+the agglomeration of point defects is energetically favorable.
+however, substitutional carbon arises in all probability.
+even transitions from the ground state are very likely to occur.
+
+concerning the precipitation simulations, the problem of the potential
+enhanced slow phase space propagation was discussed.
+it was found that low and high temperatures result in structures
+dominated by interstitial and substitutional defects respectively.
+comparing with experiment, it is concluded,
+that high temperatures are necessary to model ibs conditions.
+it was concluded that Cs is involved in the precipitation process
+at elevated temperatures.
+the role of the Si_i was outlined and in one case directly observed
+in simulation.