期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 316, 期 2, 页码 422-425出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2007.03.091
关键词
Fe3C; nanopowder; Mossbauer spectroscopy; AC susceptibility; magnetic properties
The magnetic properties of the Fe3C-based nanopowder synthesized by laser pyrolysis of ethylene and iron pentacarbonyl gases are investigated in the temperature range 4-293K by Mossbauer spectroscopy and magnetic measurements in DC and AC fields. Fe3C was identified as the dominant phase in the sample (75 wt%). The mean size of the Fe3C crystallites is estimated to be 20 nm. The residual phase in the sample is probably a mixture of nanocrystalline Fe3O4, gamma-Fe2O3, and alpha-Fe2O3. Zero-field-cooled and field-cooled DC measurements as well as real and imaginary parts of AC susceptibility curves are discussed. The nanopowder exhibits superferromagnetic behavior. (c) 2007 Elsevier B.V. All rights reserved.
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