Publication: Extended x-ray-absorption fine-structure studies of heat-treated fcc-Fe_50Cu_50 powders processed via high-energy ball milling
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1994-11-15
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American Institute of Physics
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Abstract
The local structure and chemistry of a ferromagnetic fcc-Fe_50Cu_50 solid solution obtained through high-energy ball milling were measured before and after heat-treatment-induced decomposition using extended x-ray-absorption fine-structure measurements. The decomposition is first evident with the phase separation of a-Fe after a heat treatment at 523 K. Analysis of the residual fee component revealed that the Fe atoms were predominantly surrounded by other Fe atoms, suggesting that the Fe has coalesced within the fee structure. The Fe atoms within the fee phase likely exist in low-spin clusters which provide an explanation for the reduced values of low-temperature magnetization previously measured in annealed samples [P. Crespo et aZ., Phys. Rev. B 48, 7134 (1993)].
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©1994 American Institute of Physics.
Joint Magnetism and Magnetic Materials-Intermag Conference (6. 1994. Albuquerque, Nuevo Mejico).
This work, in part, has been supported by the Spanish CICYT through Projects No. Mat. 92-0491 and No. Mat. 92-0404. A. Hernando acknowledges support of the BBV Foundation. The EXAFS measurements were carried out at the National Synchrotron Light Source (Brookhaven National Laboratory, Upton, NY), which is sponsored by the U.S. Department of Energy (Division of Material Science and Division of Chemical Sciences of the Office of Basic Energy Sciences). KMK acknowledges support from the National Research Council-Naval Research Laboratory research associate program.