Abstract
The self-diffusion coefficient of 22Na + and the ionic conductivity are measured as a function of temperature in NaCl single crystals doped with labelled yttrium ions, as well as the diffusion coefficient of 88Y 3+. We give the theoretical equations for the transport processes in the alkali halides doped with a trivalent cation; These are derived from the theory of the crystals doped with divalent cations. Solubility of YCl 3 in NaCl is accurately determined through a radioactive technique. The free enthalpy of solubility of free Y 3+ is: (2.91−13 kT) eV. A good fit of the whole set of data is obtained by treating the association between Y 3+ ions and vacancies by the single equation K 2 = 12 exp (-9.5) exp ( 1.17 kT ) . The jump frequency of Y 3+ is w 2 = 1.37 × 10 13 exp (- 0.98 kT ) sec -1 . The results are compared to those characterising the divalent foreign cations.
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