The temperature dependence of the diffusion coefficient D (cm2/s) is given by an Arrhenius type equation:
D = D0e(- Ea/RT)
where D0 (cm2/s) is pre-exponential constant, Ea (J/mol) is activation energy for diffusion, R = 8.31 (J/mol-K) is the gas constant, and T is temperature in Kelvin. For diffusion of carbon into stainless steel D0 = 6.18 cm2/s, and Ea = 187 KJ/mol. Make two plots of D versus T for 200 < T < 800C. In the first plot use linear scale for both axes and in the second plot use linear scale for T and logarithmic scale for D. Which plot is more useful?