A theory for relaxation strength and relaxation time of the elastic diffusion relaxation is derived. Strain relaxation, stress relaxation, and internal friction are considered. Interaction between the diffusing particles is taken into account. The behaviour of relaxation strength and relaxation time in the region of a critical point has been discussed. It is shown that at a critical point the static compressibility of the host lattice approaches infinity. Furthermore it is suggested, that the orientation and diffusion relaxation processes may cause strong dispersion and damping of phonons close to the Brillouin zone boundary.
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Alefeld et al. (1970) studied this question.
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