Magnetic Properties of γ - Fe2O3 Nanoparticles at the Verge of Nucleation Process

被引：1

作者：

Moscoso-Londono, O. ^{[1
]}

Carriao, M. S. ^{[1
,2
]}

Cosio-Castaneda, C. ^{[1
,3
]}

Bilovol, V. ^{[1
]}

Cohen, R. ^{[4
]}

Nagamine, L. C. C. M. ^{[4
]}

Martinez-Sanchez, R. ^{[5
]}

Lede, E. J. ^{[1
]}

Martinez-Garcia, R. ^{[1
]}

Socolovsky, L. M. ^{[1
]}

机构：

[1] Univ Buenos Aires, Fac Ingn, INTECIN, Lab Solidos Amorfos, Buenos Aires, DF, Argentina

[2] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go, Brazil

[3] Univ Nacl Autonoma Mexico, Fac Quim, Dept Fis & Quim Teor, Mexico City 04510, DF, Mexico

[4] Univ Sao Paulo, Inst Fis, Lab Mat Magnet & Espect Mossbauer, BR-01498 Sao Paulo, Brazil

[5] Univ La Habana, Inst Mat & React, Havana, Cuba

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2013年 / 49卷 / 08期

关键词：

Chemical synthesis; ferrihydrite; high-resolution transmission electron microscopy (HR-TEM); maghemite; Mossbauer spectroscopy; oxides; X-ray absorption fine structure (XAFS) (EXAFS and XANES); FERRIHYDRITE; SURFACE; FE;

D O I：

10.1109/TMAG.2013.2259619

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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, Mossbauer spectroscopy, and magnetometry.

引用

页码：4555 / 4558

页数：4

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