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Local Ordering Study of Nanostructured FeCo-C Alloys for Various Fe Contents
유용구,Bingzhi Jiang,양동석,G.M. Greneche,유성초 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
Nanostructured (FexCo1¡x)75C25 alloys were prepared by mechanical alloying. Local ordering around the central atom was examined for various Fe contents by using extended X-ray absorption .ne structure. X-ray diraction patterns indicate a cohenite-like phase for composition of x = 0.2, 0.5, and 0.8. The .rst shell of the Fourier transformed spectra changed with Fe content, indicating a change in the local ordering around the central Fe or Co atom. The x = 0.5 composition was well .tted to a (FeCo)3C phase, and the interatomic distance between the central atom and neighboring atoms was determined. The temperature dependence of magnetization was also studied for various Fe contents.0