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Crespo del Arco, Patricia Hernando Grande, Antonio Garcia Escorial, A. Kemner, K.M. Harris, V. J. 2023-06-20T20:20:38Z 2023-06-20T20:20:38Z 1994-11-15 0021-8979 10.1063/1.358254 https://hdl.handle.net/20.500.14352/60119 http://dx.doi.org/10.1063/1.358254 http://aip.scitation.org 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)]. eng open access Extended x-ray-absorption fine-structure studies of heat-treated fcc-Fe_50Cu_50 powders processed via high-energy ball milling journal article