TY - JOUR
T1 - Synthesis of air-stable iron-iron carbide nanocrystalline particles showing very high saturation magnetization
AU - Nikitenko, Sergey I.
AU - Koltypin, Yuri
AU - Markovich, Vladimir
AU - Rozenberg, Evgeny
AU - Gorodetsky, Gad
AU - Gedanken, Aharon
N1 - Funding Information:
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.
PY - 2002/1/1
Y1 - 2002/1/1
N2 - 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.
AB - 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.
KW - Fe
KW - Fe C
KW - Magnetic nanoparticles
KW - Time stability
UR - http://www.scopus.com/inward/record.url?scp=0036762002&partnerID=8YFLogxK
U2 - 10.1109/TMAG.2002.803222
DO - 10.1109/TMAG.2002.803222
M3 - Conference article
AN - SCOPUS:0036762002
SN - 0018-9464
VL - 38
SP - 2592
EP - 2594
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 5
T2 - 2002 International Magnetics Conference (Intermag 2002)
Y2 - 28 April 2002 through 2 May 2002
ER -