J. Phys. IV France 7 (1997) C2-1151-C2-1152
Mechanical-Alloying and Lattice Distortions in Ball-Milled CuFeV.G. Harris1, K.M. Kemner1, B.N. Das1, J.C. Woicik2, P. Crespo3, A. Hernando3 and A. Garcia Escorial4
1 US. Naval Research Laboratory, Washington, DC 20375, U.S.A.
2 National Institute of Standards and Technology, Gaithesburg, MD 20899, U.S.A.
3 Instituto de Magnetismo Aplicado, Las Rozas, 28230 Madrid, Spain
4 CENIM-CSIC, 28040 Madrid, Spain
Extended X-ray absorption fine structure (EXAFS) measurements were used to obtain element-specific, structural and chemical information of the local environments around Cu and Fe atoms in high-energy ball-milled samples. Analysis of the EXAFS data shows both Fe and Cu atoms reside in face-centered-cubic sites with the first coordination sphere consisting of a mixture of Fe and Cu atoms reflecting the as-prepared stoichiometry. The calculated bond distances indicate a dilation in the bonds between unlike neighbors which accounts for the lattice expansion measured by X-ray diffraction.
© EDP Sciences 1997