APPLICATION OF THE MODIFIED ELECTROSTATIC MODEL TO THE IMPURITY DIFFUSION IN NICKEL

The modified electrostatic model (Neumann and Tolle 1995) is applied t o the impurity diffusion in nickel. Z(0) = 0.4 is used for the effecti ve charge of the nickel ion. The comparison of calculated and experime ntal diffusion parameters reveals that the sign of Delta Q, the differ ence between impurity diffusion and self-diffusion energy, and the sig n of the difference between impurity diffusion and self-diffusion coef ficient is correctly predicted in all cases. On the other hand the com parison exhibits some systematic deviations for 5p impurities, which c annot be explained in terms of the current impurity diffusion models.