Abstract
Diffusion of divalent and trivalent cations is investigated in NaCl and KCl under conditions of heterodiffusion at infinite dilution. This purpose is achieved by letting radiotracers of very strong specific activity diffuse in the intrinsic range of highly pure single crystals. The importance of the experimental procedures in yielding reliable results is emphasized. Thus, Co ++, although supposedly characterized by an anomalous diffusion in NaCl and KCl, gives very good diffusion profiles with the carrier-free isotope Co-58. Also Fe +++, whose diffusion was considered impossible, gives good diffusion profiles with certain experimental precautions. Analysis of the data gives, for the diffusion of Co ++, the migration enthalpy of 0.76 eV in NaCl and 0.66 eV in KCl and the migration entropy of −2.84 k in NaCl and −1.45 k in KCl. These results are in good agreement with the values for the full set of divalent cations.
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