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problem1) Diffusion coefficients for carbon in nickel are 5.5 x 10-14 m2/s at 600 °C and 3.9 x 10-13 m2/s at 700 °C, respectively. Compute the magnitude of diffusion coefficient at 850 °C.

Qustion2) Compute the energy of vacancy formation in silver, given that equilibrium number of vacancies at 800 °C (1073K) is 3.6x1023 m-3. The atomic weight and density (at 800 °C) for silver are, respectively, 107.9 g/mol and 9.5 g/cm3

problem3) What is the angle at which diffraction occurs in Au from (101) using incident radiation with the wavelength of 1.54 A°. Au is FCC crystal and the atomic radius of the crystal is 1.44 A° ? Assume n=1.

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