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Nitrided Sm 2 Fe 17 -based materials possess excellent intrinsic magnetic properties, and in this study we have investigated two compositions: Sm 13.8 Fe 82.2  Ta 4.0  and Sm 13.7 Fe 86.3 . The stoichiometry of each phase was determined and the SmFeTa material was found to include Ta 3 Fe 7 , in addition to the Sm 2 Fe 17 , SmFe 2  and SmFe 3  phases observed in the SmFe alloy, but without the αFe dendrites which are characteristic of the binary material. Hydrogen absorption-desorption studies carried out on both materials using thermopiezic and gas-flow analyses demonstrated the different hydrogenation disproportionation desorption recombination (HDDR) behavior of the SmFeTa alloy. Scanning and transmission electron microscopy studies revealed that in the cast structure some 2.0 at.% Ta is initially dissolved in the Sm 2 (FeTa) 17  phase, however, a single HDDR cycle causes the formation of Ta-based precipitates leaving the Sm 2 (FeTa) 17  phase with much less dissolved Ta.

The Effect of Hydrogen Absorption and Desorption on Ta-doped SmFe Nitrides