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Scanning electron image of the interdiffusion zone, where is grown in the Nb/(Cu–Sn) diffusion couple at annealed for 330 h (Ref. 3).
Nearest neighbors are shown in with A15 crystal structure (a) Sn atom is surrounded by 12 Nb atoms and (b) Nb atom is surrounded by 10 Nb atoms and 4 Sn atoms.
(a) Growth rate of the product phase in Cu(Sn)/Nb diffusion couple for two different atom percentages of Sn, 7 and 8 at. % are shown. (b) Activation energy for the parabolic growth for two different atom percentages of Sn, 7 and 8 at. % are shown (Ref. 3).
Isothermal section from the Nb–Cu–Sn system at . The contact line between the two end-compositions of the diffusion couple and the corresponding diffusion path is also shown.
The difference in chemical potential of elements between two different interfaces as shown in Fig. 1 is listed.
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