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

Kurikka V.P.M. Shafi, Aharon Gedanken, Ruslan Prozorov, Adam Revesz, Janos Lendvai

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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.

Original languageEnglish
Pages (from-to)332-337
Number of pages6
JournalJournal of Materials Research
Volume15
Issue number2
DOIs
StatePublished - Feb 2000

Bibliographical note

Funding Information:
This research was supported by Grant No. 94-00230 from the US–Israel Binational Science Foundation (BSF), Jerusalem, Israel. We thank the Ministry of Sci- ence & Arts for the Binational Indo-Israel Grant as well as the Hungary–Israel exchange scientist program. A. Gedanken is grateful to the Bar-Ilan Research Authorities for supporting this project. R. Prozorov acknowledges support from the Clore Foundations. We thank Prof. M. Deutsch for use of x-ray diffraction facilities and Prof. Y. Yeshurun for extending the facilities of the National Center for Magnetic Measurements at the Department of Physics, Bar-Ilan University.

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