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Report No.

Local structure analysis of SmFe$$_2$$ and TbFe$$_2$$

Yoneda, Yasuhiro; Kohara, Shinji*; Ito, Masayoshi*; Abe, Hiroshi; Takeuchi, Mitsuaki*; Uchida, Hirohisa*; Matsumura, Yoshihito*

We performed local structure analysis of SmFe$$_2$$ and TbFe$$_2$$ in the crystallization process from amorphous by using synchrotron X-ray pair-distribution function (PDF) method. The giant mangetostrictive materials of these compounds can be controlled its property by ion irradiation. In amorphous TbFe$$_2$$ and SmFe$$_2$$, the mosaic block size was small and the short-range order structure owing to Fe-Fe network maintained. In crystalline SmFe$$_2$$, a rigid long-range order structure of Fe-Fe and Sm-Sm network coexisted and it had a large mosaic block size. On the other hand, in crystalline TbFe$$_2$$, Fe-Fe network degraded by Tb-Tb network owing to its lattice tolerance.



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