Abstract
Elements in atomic ratios Nd 2(Fe 0.9Mo 0.1) 14B were melted in an induction furnace and annealed in order to examine the effect of molybdenum during the preparation of Nd-Fe-B magnets. A phase analysis has been made from 57 Fe Mössbauer spectroscopic measurements in the temperature range of 100 to 700 K. It is found that two iron containing phases are formed, one Mo rich Fe alloy and the other Nd-Fe(Mo)-B isostructural to Nd 2Fe 14B. The Nd 1.1Fe 4B 4 phase usually found in Nd-Fe-B magnets is not observed in these samples. The Curie temperature, T c, is found to be 605(5) K from the Mössbauer as well as vibrational sample magnetometer measurements on the same sample. At low temperatures, the average hyperfine field at Fe nuclei is found to show a decrease with respect to the value for Nd 2Fe 14B.
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