Abstract
RE2Fe14B alloys and some of their hydrides have been studied through57Fe and161Dy Mossbauer spectroscopy (MS). For both the paramagnetic and ordered phases a consistent and physically sound analysis of the57Fe spectra is presented. Fe hyperfine fields and the local magnetic moments are obtained and compared with magnetic and structural data. A spin reorientation is observed for Er2Fe14B. A constant collinear structure down to 4.2 K was determined for the other samples. The161Dy spectra are interpreted for a pure ¦JZ=15/2 > ground multiplet in Dy2Fe14B and its hydride. The B2 crystal field parameters were estimated empirically for the Dy-alloy. Their values can account for the anisotropy in the compounds.
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