Application of the critical gradient concept to the nucleation of the first-product phase in Co / Al thin films

Pasichnyy, M. O., Schmitz, G., Gusak, A. M., Vovk, V. (2005) Application of the critical gradient concept to the nucleation of the first-product phase in Co / Al thin films. Physical review (№ 72). с. 1-7.

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Резюме

Recent high resolution analysis by atom probe tomography demonstrated that the first reaction product in Al/Co reaction couples, the phase Al9Co2, is only nucleated after interdiffusion of the pure elements on a depth of about 4 nm. In this article numerical calculations are presented to investigate, whether critical gradient concepts based on thermodynamic considerations are suitable to understand the observed retardation of nucleation. Different microscopic nucleation mechanisms are considered. It is found that the formation of the nucleus by a polymorphic transformation inside the diffusion zone provides a quantitative agreement with experimental data.

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