J. Phys. IV France 7 (1997) C2-1221-C2-1222
EXAFS Study of Ball-Milled Elemental Nanocrystalline PowdersP.J. Schilling1, J.-H. He2 and E. Ma2
1 Center for Advanced Microstructures and Devices (CAMD), Louisiana State University, Baton Rouge, LA 70803, U.S.A.
2 Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, U.S.A.
Nanocrystalline elemental powders of Cr, Fe, Ni, and Cu were prepared by high-energy ball milling and studied using EXAFS spectroscopy. Data were acquired in total electron yield to avoid thickness effects, and a detailed analysis was performed to obtain structural parameters. While significant amplitude reduction was observed in the EXAFS signals of the ball-milled powders, reduction in first neighbor coordination number based on curve-fitting was limited to ≤ 15%. The results are consistent with the presence of nanocrystalline structures and structural defects induced by the milling process.
© EDP Sciences 1997