Small-angle x-ray scattering study of nanocrystalline FeyCu1-yalloys produced by ball milling
| Autor: | M. B. Fernández van Raap, I L Torriani, Francisco H. Sánchez, Leandro M. Socolovsky |
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| Rok vydání: | 2002 |
| Předmět: |
Materials science
Aleaciones FeCu Scattering Small-angle X-ray scattering Ciencias Físicas Analytical chemistry Synchrotron radiation SAXS Condensed Matter Physics Nanocrystalline material Ball milling Crystallography Phase (matter) Nanocompositos General Materials Science Density contrast Ball mill CIENCIAS NATURALES Y EXACTAS Intensity (heat transfer) Física de los Materiales Condensados |
| Zdroj: | Journal of Physics: Condensed Matter. 14:857-864 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/0953-8984/14/4/318 |
| Popis: | Small-angle x-ray scattering measurements on ball-milled FeyCu1−y giantmagnetoresistivealloys (0.141 y 0.45) have been performed usingsynchrotron radiation. For samples with different nominal compositions,prepared under exactly the same conditions, the scattered intensity recordedas a function of the wavevector varied systematically. For this reason, thestrong scattering signal was attributed mainly to composition fluctuations inthe crystalline grains. The system was treated as a two-phase model consistingof Fe-rich regions in a homogeneous Cu matrix, with composition-dependentrelative volume fractions. Real-space analysis of the scattering was performedin terms of a volumetric distribution of spherical particles. Results indicatethat the main contribution corresponds to 2 nm scattering objects of welldefineddensity contrast. The invariantQwas calculated to assess the variationsin 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.% ironconcentration in the iron-rich phase for all the nominal compositions studied. Fil: Fernández van Raap, Marcela Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina Fil: Socolovsky, Leandro Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina Fil: Sánchez, Francisco Homero. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina Fil: Torriani, L.. Unicamp; Brasil |
| Databáze: | OpenAIRE |
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