Dissolution Kinetics of Precipitates of Divalent Cadmium in Sodium Chloride Studied by means of Ionic Thermoconductivity

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Abstract
In OH− “free” system the isothermal time evolution of the solution process of I.V . (impurity‐vacancy) dipoles to achieve the thermodynamical equilibrium was studied by means of the I.T.C. (ionic thermoconductivity) method in the annealing temperature range from 323° to 423 °K. Two stages were found, both described by a monomolecular first order kinetics. The early fast stage and the subsequent slow one are characterized by activation energies of and , comparable with the activation energy for impurity diffusion, and pre‐exponential frequency factors . The sources of I.V . dipoles in the two stages were tentatively identified with dipolar precipitates responsible for the additional peaks in I.T.C. spectrum. The energy required to decompose one kind of the above microprecipitates is close to the solution energy of I.V . dipoles. The role of preannealing on thermodynamical equilibrium value ns and on the solution kinetics was also analyzed.

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