Abstract
Abstract A Contrary to current opinion, Hägg's rule can be applied in the analysis of the diffusion of 3d and other solutes in isotropic transition-metal host phases such as γ-U, β-Zr and Nb if the crystal radii of the host lattice and of the solute atoms are defined properly. A priori, Hägg's rule then constitutes a necessary but not a sufficient condition for interstitial diffusion in these systems. Then the correlation between activation entropy and enthalpy of solute diffusion in the above host phases can be used to identify the Hägg parameters λi at which interstitial diffusion is observed and λ is related to the elastic part of the activation enthalpy of interstitial solute diffusion.
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