Mossbauer spectra with 155 Gd were taken of a Gd 2 Fe 14 B single-crystal absorber. These spectra, which ave a more pronounced structure than those of powder absorber, lead to considerably improved precision in the hyperfine interaction parameter values and in estimates for the second-order crystal field parameters. A comparison between spectra taken in zero field and in a field 8 T shows the magnetic hyperfine field at Gd nuclei to be positive at both lattice sites.
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Bogé et al. (1986) studied this question.
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