DocumentCode :
54782
Title :
Magnetic Properties of 
Nanoparticles at the Verge of Nucleation Process
Author :
Moscoso-Londono, O. ; Carriao, M.S. ; Cosio-Castaneda, C. ; Bilovol, Vitaliy ; Cohen, Reuven ; Nagamine, L.C.C.M. ; Martinez-Sanchez, R. ; Lede, E.J. ; Martinez-Garcia, R. ; Socolovsky, L.M.
Author_Institution :
Lab. de Solidos Amorfos, Univ. de Buenos Aires, Buenos Aires, Argentina
Volume :
49
Issue :
8
fYear :
2013
fDate :
Aug. 2013
Firstpage :
4555
Lastpage :
4558
Abstract :
A low-energy new method based in a one-step synthesis at room temperature produces very small maghemite nanoparticles. The fast neutralization reaction (co-precipitation) of a ferric solution (FeCl3 aqueous) in a basic medium (NH4OH concentrated) produces an intermediate phase, presumably two-line ferrihydrite, that in oxidizing conditions is transformed to maghemite nanoparticles. That “primordial soup” is characterized by small atom arrangements that are the base for maghemite tiny crystals. The final product of the reaction was characterized by X-ray diffraction, high-resolution transmission electron microscopy, X-ray absorption fine structure, Mössbauer spectroscopy, and magnetometry.
Keywords :
EXAFS; Mossbauer effect; X-ray diffraction; iron compounds; magnetic particles; nanofabrication; nanomagnetics; nanoparticles; nucleation; oxidation; precipitation (physical chemistry); transmission electron microscopy; EXAF; Fe2O3; Mossbauer spectroscopy; X-ray absorption fine structure; X-ray diffraction; basic medium; coprecipitation; fast neutralization reaction; ferric solution; high-resolution transmission electron microscopy; intermediate phase; low-energy new method; maghemite nanoparticles; maghemite tiny crystals; magnetic properties; magnetometry; nucleation; one-step synthesis; oxidation; primordial soup; small atom arrangements; temperature 293 K to 298 K; two-line ferrihydrite; Iron; Magnetic properties; Magnetic resonance imaging; Magnetization; Nanoparticles; Saturation magnetization; Temperature measurement; Chemical synthesis; Mössbauer spectroscopy; X-ray absorption fine structure (XAFS) (EXAFS and XANES); ferrihydrite; high-resolution transmission electron microscopy (HR-TEM); maghemite; oxides;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2013.2259619
Filename :
6566086
Link To Document :
