Nanoanalysis of Interreactions
Diffusion induced recrystallization of Au/Cu thin films
The earliest stages of interdiffusion between Au/Cu were investigated by HRTEM and Z-contrast microscopy.
Both metals crystallize in an fcc structure, which leads to the assumption of a simple mixing by random walk.
However, the reaction gets quite interesting because of the lattice size mismatch between both components. We
could prove that the early diffusion proceed in two stages; a first very quick semi-coherent stage is followed by
a complete recrystallisation of the initially epitaxial layers. By that a complex nano-crystalline morphology
develops. The first semi-coherent step was shown by quantitative arguments, to cease because of vacancy
depletion inside the reaction zone. It is assumed that this behaviour is rather general in the case of considerable
lattice mismatch. Now the project is aimed to prove the importance of the lattice mismatch by a controlled
chemical variation of the initial layer composition.
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