Study of Iron oxide nanoparticles using Mössbauer spectroscopy with a high velocity resolution / Oshtrakh M.I., Ushakov M.V., Šepelák V., Semionkin V.A., Morais P.C. // Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy. - 2016. - V. 152, l. . - P. 666-679.

ISSN:

13861425

Type:

Article

Abstract:

Iron oxide (magnetite and maghemite) nanoparticles developed for magnetic fluids were studied using Mössbauer spectroscopy with a high velocity resolution at 295 and 90 K. The recorded Mössbauer spectra have demonstrated that usual physical models based on octahedral and tetrahedral sites were not suitable for fitting. Alternatively, the Mössbauer spectra were nicely fitted using a large number of magnetic sextets. The obtained results showed that the Mössbauer spectra and the assessed parameters were different for nanoparticles as-prepared and dispersed in the dispersing fluid at 295 K. We claim that this finding is mainly due to the interaction of polar molecules with Iron cations at nanoparticle's surface or due to the surface coating using carboxylic-terminated molecules. It is assumed that the large number of spectral components may be related to complexity of the nanoparticle's characteristics and deviations from stoichiometry, including in the latter the influence of the oxidation of magnetite towards maghemite. © 2015 Elsevier B.V.All rights reserved.

Author keywords:

Maghemite nanoparticles; Magnetic fluids; Magnetite nanoparticles; Mössbauer spectroscopy

Index keywords:

Iron; Iron compounds; Iron oxides; Magnetic fluids; Magnetism; Magnetite; Molecules; Nanomagnetics; Nanoparticles; Iron oxide nanoparticle; Maghemite nanoparticle; Magnetic sextet; Polar molecules; Sp

DOI:

10.1016/j.saa.2015.06.017

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946489849&doi=10.1016%2fj.saa.2015.06.017&partnerID=40&md5=18d026a3d38cf25185d721880a790be9

Соавторы в МНС:

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946489849&doi=10.1016%2fj.saa.2015.06.017&partnerID=40&md5=18d026a3d38cf25185d721880a790be9
Affiliations	Department of Physical Techniques and Devices for Quality Control, Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russian Federation; Department of Experimental Physics, Institute of Physics and Technology, Ural Federal University, Ekaterinburg, Russian Federation; Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, Germany; Universidade de Brasília, Instituto de Física, Núcleo de Física Aplicada, Brasília, DF, Brazil; Huazhong University of Science and Technology, School of Automation, Wuhan, China
Author Keywords	Maghemite nanoparticles; Magnetic fluids; Magnetite nanoparticles; Mössbauer spectroscopy
Chemicals/CAS	ferric ion, 20074-52-6; ferric oxide, 1309-37-1, 56449-54-8; Ferric Compounds; ferric oxide; Magnetite Nanoparticles
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Correspondence Address	Oshtrakh, M.I.; Department of Physical Techniques and Devices for Quality Control, Institute of Physics and Technology, Ural Federal UniversityRussian Federation
Publisher	Elsevier
CODEN	SAMCA
PubMed ID	26105556
Language of Original Document	English
Abbreviated Source Title	Spectrochim. Acta Part A Mol. Biomol. Spectrosc.
Source	Scopus