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Journal of Materials Science

, Volume 29, Issue 5, pp 1306–1309 | Cite as

Reaction mechanism for the formation of intermetallic compounds from layered Sm/Fe powder obtained by mechanical milling

  • Ming Tan
Papers

Abstract

Solid-state reactions in layered Sm/Fe powder particles with an overall composition of Sm12Fe88, obtained by ball milling, have been investigated by X-ray diffraction. During annealing at 500‡C, one reaction, Sm+2Fe→SmFe2 was observed in the time-range studied. However, during annealing at 800‡C, five reactions were observed: Sm+2Fe→SmFe2, Sm +3Fe→SmFe3, 2Sm+17Fe→Sm2Fe17, 2SmFe2+13Fe→Sm2Fe17, and 2SmFe3 +11Fe→Sm2Fe17. It is proposed that such reactions occur by a nucleation and growth process. Reactions of samarium with iron can be governed by nucleation; Sm/Fe interfaces possessing a higher free energy per unit area can play an important role in the nucleation. The observed results are discussed.

Keywords

Iron Polymer Free Energy Milling Unit Area 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • Ming Tan
    • 1
  1. 1.Institute of Solid State PhysicsAcademia SinicaAnhuiPeople's Republic of China

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