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|Type:||Artigo de periódico|
|Title:||Small-angle x-ray scattering study of nanocrystalline FeyCu1-y alloys produced by ball milling|
|Author:||van Raap, MBF|
|Abstract:||Small-angle x-ray scattering measurements on ball-milled FeyCu1-y giant-magnetoresistive alloys (0.141 less than or equal to y less than or equal to 0.45) have been performed using synchrotron radiation. For samples with different nominal compositions, prepared under exactly the same conditions, the scattered intensity recorded as a function of the wavevector varied systematically. For this reason, the strong scattering signal was attributed mainly to composition fluctuations in the crystalline grains. The system was treated as a two-phase model consisting of Fe-rich regions in a homogeneous Cu matrix, with composition-dependent relative volume fractions. Real-space analysis of the scattering was performed in terms of a volumetric distribution of spherical particles. Results indicate that the main contribution corresponds to 2 nm scattering objects of well-defined density contrast. The invariant Q was calculated to assess the variations in electron-density contrast as a function of the Fe content in the samples. Calculations based on these results allowed the determination of 0.35 at.% iron concentration in the iron-rich phase for all the nominal compositions studied.|
|Editor:||Iop Publishing Ltd|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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