Abstract

The application of quasielastic-neutron-scattering or Mössbauer experiments to resolve the disputed origin of non-Arrhenius self-diffusional behavior in crystals is proposed. For that purpose, the related line-broadening effects are analyzed in terms of both the prevailing ’’two-defect model’’ and the ’’one-defect model’’ in its formulation, for example, by Gilder and Lazarus. The orientation dependence of the width of diffusion-broadened quasielastic and Mössbauer lines is found to differ for the two models. More importantly, however, it is shown that interpretation of line-broadening data in terms of the two models yields diffusion coefficients which cannot simultaneously agree with tracer data. A numerical analysis is presented for vacancy-induced self-diffusion in bcc crystals, such as sodium metal.

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