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

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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.

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  1. Institute of Solid State Physics, Academia Sinica, Hefei, 230031, Anhui, People's Republic of China

    Ming Tan

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  1. Ming Tan
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Tan, M. Reaction mechanism for the formation of intermetallic compounds from layered Sm/Fe powder obtained by mechanical milling. J Mater Sci 29, 1306–1309 (1994). https://doi.org/10.1007/BF00975080

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  • DOI: https://doi.org/10.1007/BF00975080

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