Coherent cluster atomic ordering in the Fe-27Al intermetallic compound
| Autor: | Ivan A. Bobrikov, A. M. Balagurov, S.V. Sumnikov, Igor S. Golovin, B. Mukhametuly |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Diffraction Phase transition Materials science Physics and Astronomy (miscellaneous) Condensed matter physics Neutron diffraction Intermetallic 02 engineering and technology Neutron scattering Atmospheric temperature range 021001 nanoscience & nanotechnology 01 natural sciences Phase (matter) 0103 physical sciences Cluster (physics) 0210 nano-technology |
| Zdroj: | JETP Letters. 104:539-545 |
| ISSN: | 1090-6487 0021-3640 |
| Popis: | Neutron diffraction studies of the Fe0.735Al0.265 compound are performed in a wide temperature range (20–900°C) in order to determine its structural states and the mechanism of ordering of atoms. The combination of high-resolution diffraction and the real-time detection of diffraction spectra makes it possible to establish that, in contrast to traditional notions, the structure of this compound at room temperature is a phase with only a partially ordered arrangement of Fe and Al in a unit cell. A completely ordered phase (such as Fe3Al) is present in the form of mesoscopic (~200A) clusters coherently incorporated into the disordered matrix of the main phase. After the transition of the sample to a disordered state (T> 740°С) and slow cooling to room temperature, the size of structurally ordered clusters increases to ~900 A. A high contrast in the coherent neutron scattering lengths of iron and gallium nuclei allows the accurate determination of the temperature dependence of the occupancy factors of sites by Fe and Al atoms up to a phase transition to the disordered state. |
| Databáze: | OpenAIRE |
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