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 language | English |
|---|---|
| Pages (from-to) | 332-337 |
| Number of pages | 6 |
| Journal | Journal of Materials Research |
| Volume | 15 |
| Issue number | 2 |
| DOIs | |
| State | Published - 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.
Funding
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.
| Funders | Funder number |
|---|---|
| Bar-Ilan Research Authorities | |
| Clore Foundations | |
| United States-Israel Binational Science Foundation |