Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization

Sergey I. Nikitenko, Yuri Koltypin, Vladimir Markovich, Evgeny Rozenberg, Gad Gorodetsky, Aharon Gedanken

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13 Scopus citations

Abstract

Initial results on synthesis, magnetic properties and time stability of iron-iron carbide nanoparticles are presented. It is shown that as-prepared (after sonochemical synthesis in solution) material consists of small iron particles (d < 10 nm) embedded in a polymeric matrix. It was found to be super-paramagnetic. Consequent thermal annealing of as-prepared material at temperatures up to 1073 K in argon results, first, in the growth of the iron particles up to 150 nm. Second, the obtained powders become ferromagnetic. Third, such powders are air-stable due to the formation of an interracial iron carbide layer during annealing. The air-stability of the iron-iron carbide powder was tested by time dependence measurements of its resistivity.

Original languageEnglish
Pages (from-to)2592-2594
Number of pages3
JournalIEEE Transactions on Magnetics
Volume38
Issue number5 I
DOIs
StatePublished - Sep 2002
Event2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
Duration: 28 Apr 20022 May 2002

Bibliographical note

Funding Information:
The work was done with the financial support from a collaborative project with Central Council for Research in Homeopathy (CCRH), Under Ministry of AYUSH, Govt. of India (F. No. 6-01/14-15/CCRH/cash/11515)

Funding

Manuscript received February 7, 2002; revised May 21, 2002. This work was supported by the Israeli Ministry of Science, Culture and Sports under Infrastructure Grant 1093. S. I. Nikitenko, Y. Koltypin, and A. Gedanken are with the Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel (e-mail: [email protected]). V. Markovich, E. Rozenberg, and G. Gorodetsky are with the Department of Physics, Ben-Gurion University, 84105 Beer-Sheva, Israel. Digital Object Identifier 10.1109/TMAG.2002.803222.

FundersFunder number
Ministry of Culture and Sport1093

    Keywords

    • Fe
    • Fe C
    • Magnetic nanoparticles
    • Time stability

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