An analytical method of calculating variable diffusion coefficients

An analytical method of calculating variable diffusion coefficients has been developed. The Boltzmann-Matano graphical method used up to now has certain disadvantages which restrict the acuracy of the evaluated diffusion coefficients. Due to these disadvantages, the accuracy of this method is restricted even more when diffusion coefficients are determined in an area of low concentration of the diffused species of atom. The reliability of the analytical expression obtained in the present investigation has been verified experimentally by comparing the results obtained with those of the graphical method. On the basis of this comparison the analytical method can claim an accuracy better than, or at least equal to, that of the graphical method.