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Thick single crystalline Tin ( Sn ) and Indium ( In ) metal plates are attached against each other ( = semi - infinite diffusion

Thick single crystalline Tin (Sn) and Indium (In) metal plates are attached against each other (=semi-infinite diffusion couple) at the temperature of 100C.
a) Based on the phase diagram (see. Fig. 1a), draw the structure of the diffusion couple with superimposed composition profile for Indium, when sufficient amount of time has elapsed so that local equilibria is achieved in all interfaces. (NB. Mark clearly the compositions of the phases at all interfaces!)(3p)
b) Please discuss on the possible diffusion mechanisms and types in that diffusion couple? (1p)
c) Based on the Gibbs energy - composition diagram (see Figure 2) define the driving force for Sn to diffuse through phase (i.e from Sn| interface to | interface) at 100C.(2p)
Figure 2. Gibbs energy - composition diagram at 100C from Sn-In system
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