M$\stackrel{..}{o}$ssbauer studies of the (Tb$_{0,45}$Dy$_{0,55}$)$_{1-x}$Ho$_x$Fe$_2$ system have shown that spin reorientation occurred in the $(1\bar{1}0)$ plane in a narrow concentration range; the isotropic magnetic field on $^{57}$Fe nuclei depends linearly on the effective spin of the sublattice of rare-earth metal cations; and the anisotropic magnetic field included two contributions of the same sign and of the si;tme order of magnitude, those from localized magnetic moments and conduction electrons polarized by these moments. No changes in the hyperfine interaction parameters caused by spin reorientation were detected. Mechanisms of formation of electric field gradients in the vicinity of $^{57}$Fe nuclei in Laves phases of the RFe$_2$ type have been suggested.
Department of General Physics, Department of Solid-State Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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