Magnetic properties of glass‐metal nanocomposites prepared by the sol‐gel route and hot pressing
作者:
S. Roy,
D. Das,
D. Chakravorty,
D. C. Agrawal,
期刊:
Journal of Applied Physics
(AIP Available online 1993)
卷期:
Volume 74,
issue 7
页码: 4746-4749
ISSN:0021-8979
年代: 1993
DOI:10.1063/1.354344
出版商: AIP
数据来源: AIP
摘要:
Glass‐metal nanocomposite powders in the systems Fe/SiO2and Ni/SiO2have been prepared by the sol‐gel technique followed by reduction treatment. Bulk nanocomposites are then fabricated by hot pressing these powders. The metal particle diameters range from 8.9 to 14.8 nm. The materials show enhanced coercivities, e.g., a maximum of 82 Oe in the case of Ni/SiO2and a maximum of 474 Oe in the case of Fe/SiO2systems. The Mo¨ssbauer spectra of Fe/SiO2samples are comprised of a ferromagnetic component superposed on a superparamagnetic doublet.
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