Factors That Influence Diffusion 4. Question 6.23 The accompanying figure shows a plot of the logarithm (to the base 10) of the diffusion coefficient versus reciprocal of the absolute temperature for the diffusion of iron in chromium. Determine values for the activation energy and preexponential. CIVE 3440-1 Assignment Diff. & ST. Diffusion coefficient (m/s) 10-15 10-16 0.55 0.60 0.65 Reciprocal temperature (1000/K) 0.70