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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
Socolovsky, LM
Sanchez, FH
Torriani, IL
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.
Country: Inglaterra
Editor: Iop Publishing Ltd
Rights: fechado
Date Issue: 2002
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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