Structure and Magnetic Properties of Sm-Fe-N Prepared by Nitriding High Purity Sm2Fe17 Grown from Sm-Rich Melt

Abstract

We report on a novel method for preparation of high purity Sm2Fe17phase by removing the liquid impurity phase from the Sm-rich precursor at high temperatures. With decreasing Sm addition, the percentage of liquid phase left as impurity is decreasing. Nitrogen absorption to the Sm2Fe17powders results in a complete formation of Sm2Fe17N3, which shows a weak disproportionation reaction at 773 K. The magnetic performance of the Sm2Fe17N3from precursors with different Sm content is improving with decreasing Sm content.