Abstract
The structural and magnetic properties of mechanically alloyed samples of Sm 12.5Fe 87.5 have been studied by adjusting the nitrogenation temperature and time. When the nitrogenation temperature is 500 °C, a very short time (less than 5 min) is needed for the nitrogen atoms to be introduced into the lattice. No prominent incubation time is observed, consequently the magnetic properties (including the Curie temperature) of the samples depend only slightly on the nitrogenation time. When nitrogenated at 260 °C, two phases, SmFe 7 and SmFe 7N δ, coexist in the samples. The temperature dependences of the magnetic properties of the SmFeN magnets have been measured up to 600 °C. It is found that SmFe powders as well as polymer-bonded magnets made by mechanical alloying have a good thermostability. The coercivity at 200 °C of the SmFeN magnets is greater than 10 kOe. At 550 °C the main phase SmFe 7N δ decomposes into SmN and α-Fe and the magnetic properties of the samples are rapidly degraded.
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