Abstract
The influence of crystal field fluctuations on Mossbauer hyperfine spectra is analyzed. These fluctuations lead to violation of cubic symmetry of the environment, to a time-dependent splitting of a quadruplet and, as a consequence, to a temporal modulation of the hyperfine interaction. It is found that fluctuations of E-type do not lead to a complete averaging of the hyperfine interaction in the fast relaxation limit, unlike the case of e.g. magnetic relaxation and any other type of crystal field fluctuations. Moreover, for ions with J=7/2 in the fast relaxation limit the relaxation spectra of Γ8 are identical to the spectra of the Γ8 doublet.
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