The effective diffusivity, Deff, was calculated using Fick’s diffusion equation, and the value of Deff varied from 1.34 x 10-10 to 4.36 x 10-10 m2/s. The activation energy, Ea, and diffusivity constant, D0, were 24.99 kJ/mol and 2.23 x 10-6m2/s, respectively.