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论文类型：期刊论文

发表时间：2016-06-01

发表刊物：PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE

收录刊物：SCIE、EI

卷号：213

期号：6

页面范围：1585-1591

ISSN号：1862-6300

关键字：iron silicide; magnetic property; mechanical alloying; Mossbauer spectroscopy

摘要：Fe3Si-Al2O3 nanocomposite has been prepared by mechanical alloying of Fe3O4, Al and Si powder mixture and heat treatment. Powder XRD patterns, TEM and HRTEM images and XPS spectra revealed the crystalline transformations from raw materials to Fe3Si-Al2O3 nanocomposite during mechanical alloying and annealing and from Fe to Fe3Si to a mixture of Fe3Si, Fe5Si3 and FeSi with the proportion of Si in raw materials increasing. The average particle size of smaller Fe3Si nanoparticles was about 20 nm and the aggregation under high temperature leaded to larger Fe3Si nanoparticles with average particle size of about 60 nm. Fe-57 Mossbauer spectra illustrated the existence of amorphous phases and effectively supplemented other characterisation results. The samples exhibited ferromagnetic behaviour with hysteresis loops and their saturation magnetisations decreased with the proportion of Si in samples increasing. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim