It was noted that the segregation of Cu, Ni and Fe to Frank-type partial dislocations in Czochralski-grown material depended markedly upon the cooling rate of the specimens after contamination. In the case of cooled slowly specimens, Cu did not decorate the Frank partials, while Ni decorated them slightly. On the other hand, Fe decorated Frank partials in both quickly- and slowly-cooled specimens, and the amount of precipitated Fe on Frank partials was larger in a slowly cooled specimen than in a rapidly cooled one. The difference in segregation behaviors between Cu, Ni and Fe was explained in terms of 3 factors. These were the presence of precipitate nuclei (as influenced by the dislocation-core structure), the crystal structure of the precipitates, and the diffusivity of the impurities.

B.Shen, T.Sekiguchi, K.Sumino: Materials Science Forum, 1995, 196-201, 1207-12