Affiliation:
1. University of Debrecen
2. Debrecen University
Abstract
According to classical Nernst-Einstein equation the diffusive flux is proportional to the driving force. However, this linear law is not valid if the driving force is very large. Attempts in the literature for the derivation of an “improved relation” till now were mostly restricted to the cases when the diffusion coefficient was independent of the composition. On the other hand, even if there are no externaldriving forces (other than related to the chemical driving force) present, deviations from the Fick I law are expected (transition from parabolic to linear growth-behaviour) on nanoscale for composition dependent diffusion coefficients. General description for the case when the driving forces and the diffusion asymmetry are large, is treated. The special case of large pressure gradients is discussed in detail and their effects on the deviation form the parabolic growth law on nanoscale will be analyzed. Effect of a pressure gradient on the crossover thickness between parabolic and linear regimes and on the interface transfer coefficient, K, is also treated.
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Radiation
Reference18 articles.
1. Z. Erdélyi, C. Girardeaux, Z. Tıkei, D.L. Beke, C. Cserháti, A. Roland, Surf. Sci. 496, 129 (2001).
2. Z. Erdélyi, G. L. Katona, D.L. Beke, Phys. Rev. B69, 113407-1-4 (2004).
3. G.L. Katona, D.L. Beke, Z. Erdélyi, Ch. Dietrich, F. Weigl, H-G. Boyen, B. Koslowski, P. Ziemann. Phys. Rev. B. Vol. 71 (2005) p.115432.
4. Z. Erdélyi. D. L Beke, I.A. Szabó, Phys Rev. Letters, 89, 165901-1 - 195901-4 (2002).
5. Z. Erdélyi and D.L. Beke, Phys. Rev. B 68, 092102-1 - 092102-4 (2003).
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献