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Preparation and magnetic properties of nanosized amorphous ternary Fe–Ni–Co alloy powders

Published online by Cambridge University Press:  31 January 2011

Kurikka V. P. M. Shafi ,
Aharon Gedanken ,
Ruslan Prozorov ,
Adam Revesz  and
Janos Lendvai
Kurikka V. P. M. Shafi
Affiliation:
Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
Aharon Gedanken*
Affiliation:
Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
Ruslan Prozorov
Affiliation:
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
Adam Revesz
Affiliation:
Department of General Physics, Lorand Eotvos University, H-1088, Budapest, Hungary
Janos Lendvai
Affiliation:
Department of General Physics, Lorand Eotvos University, H-1088, Budapest, Hungary
*
a)Address correspondence to this author.[email protected]
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Abstract

Nanosized amorphous alloy powders of Fe25Ni13Co62, Fe38Ni23Co39, Fe40,Ni24,Co36, and Fe69Ni9Co22 were prepared by sonochemical decomposition of solutions of volatile organic precursors, Fe(CO)5, Ni(CO)4, and Co(NO)(CO)3 in decalin, under an argon pressure of 100 to 150 kPa at 273 K. The amorphous nature of these particles was confirmed by various techniques, such as scanning electron microscopy, transmission electron microscopy, electron microdiffraction, and x-ray diffractograms. Magnetic measurements indicated that the as-prepared amorphous Fe–Ni–Co alloy particles were superparamagnetic. The observed magnetization measured up to a field of 1.5 kG of the annealed Fe–Ni–Co samples (75–87 emu g−1) was significantly lower than that for the reported multidomain bulk particles (175 emu g−1), reflecting the ultrafine nature of our sample.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 2 , February 2000 , pp. 332 - 337
Copyright
Copyright © Materials Research Society 2000

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