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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of disorder on the structural and magnetic properties of the Fe50Si50 nanostructured system
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Effect of disorder on the structural and magnetic properties of the Fe50Si50 nanostructured system

机译：无序度对Fe50Si50纳米结构体系结构和磁性的影响

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摘要

By an adequate preparation route, beginning from a Fe50Si50 melted sample, an ordered Fe Si simple cubic (sc) phase was obtained. After a milling process the alloy became disordered, its crystallite size decreased and the Fe3Si ferromagnetic phase appear and coexist with the FeSi (sc) paramagnetic phase after 24 h milling. All the samples exhibit hysteresis loops with a small coercive field and magnetization values at 2 T. These values increase with milling time; however, a soft magnetic character is exhibited. The small magnetism detected below 24 h milling contrasts with the Mossbauer results for the same samples. This finding is attributed to the grain boundaries and the grain surfaces, in which the coherence is loss and the coordination number of Fe sites changes relative to those inside the grains. These Fe sites can behave ferromagnetically, and act as the nucleation sites for the Fe3Si phase. Samples with only the FeSi (sc) phase present a predominant dipolar interaction, between the small magnetic moment of the particles, while those samples with the Fe3Si exhibit a predominant ferromagnetic exchange coupling between the Fe3Si grains. (C) 2015 Elsevier B.V. All rights reserved.
机译：通过适当的制备途径，从熔融的Fe50Si50样品开始，可以获得有序的Fe Si单立方（sc）相。铣削过程之后，合金变得无序，其晶粒尺寸减小，并且在铣削24 h后出现Fe3Si铁磁相并与FeSi（sc）顺磁相共存。所有样品均表现出具有小的矫顽场和2 T时的磁化强度值的磁滞回线。但是，表现出软磁性。对于相同的样品，在铣削24 h以下检测到的小磁性与Mossbauer结果形成对比。该发现归因于晶粒边界和晶粒表面，其中相干性损失并且Fe位点的配位数相对于晶粒内部的那些改变。这些Fe部位可以具有铁磁性能，并充当Fe3Si相的形核部位。仅具有FeSi（sc）相的样品在颗粒的小磁矩之间表现出主要的偶极相互作用，而那些具有Fe3Si的样品在Fe3Si晶粒之间表现出主要的铁磁交换耦合。 （C）2015 Elsevier B.V.保留所有权利。

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