The time‐differential perturbed angular correlation (TDPAC) of the 133–482 keV γ‐ray cascade in 181Ta in the intermetallic compound Hf2Fe is measured in the temperature range 78 to 903 K. At 78 K the following parameters of the electric field gradient (EFG) at the two unequivalent Hf sites are obtained: V italiczz(1) = (1.91 ± 0.14) × 1022 V/m2, η(1) = 0.505(7); V italiczz(2) = (1.05 ± 0.2) × 1021 V/m2, η(2) = 0 (fixed parameter). Discontinuities in the temperature dependence of the EFG parameters at T ≈︁ 600 K are observed as well as an indication at the possible existence of the third Hf site above 600 K.
Radioactive 111In was introduced into the Laves phases YMn2, GdFe2 and YbFe2 synthesized under pressure of 8 GPa, and the hyperfine interaction of the daughter 111Cd was measured by the perturbed angular correlation method. In the obtained hexagonal (C14) phase YMn2 111In is substituted for Mn, predominantly at h‐sites, experiencing there an electric quadrupole interaction with νQ = 32.0(5) MHz and η = 0.51(5) at 300 K. In GdFe2 and YbFe2 (cubic C15) most of the 111In–111Cd probes (≈︂80%) substituted mainly for the rare earth atoms and experienced a magnetic hyperfine field |Bhf| = 2.92(4) T and 3.32(7) T, respectively, at 300 K. The results are discussed together with the published data for the normal cubic YMn2, and for LuFe2 and ZrFe2.
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