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Magnetization and stability study of a cobalt-ferrite-based ferrofluid

Kamali, Saeed and Pouryazdan, Mohsen and Ghafari, Mohammad and Itou, Masayoshi and Rahman, Masoud and Stroeve, Pieter and Hahn, Horst and Sakurai, Yoshiharu (2016):
Magnetization and stability study of a cobalt-ferrite-based ferrofluid.
404, In: Journal of Magnetism and Magnetic Materials, Elsevier Science BV, Netherlands, pp. 143-147, ISSN 03048853, [Online-Edition: https://doi.org/10.1016/j.jmmm.2015.12.007],
[Article]

Abstract

In this study the structural and magnetization properties of a CoFe2O4-based ferrofluid was investigated using x-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDS), Mossbauer spectroscopy, and magnetic Compton scattering (MCS) measurements. The XRD diagram indicates that the nanoparticles in the ferrofluid are inverse spinel and TEM graph shows that the ferrofluid consists of spherical nanoparticles with an average diameter of 18 +/- 1 nm, in good agreement with the size, 19.4 nm, extracted from line broadening of the XRD peaks. According to EDS measurements the composition of the nanoparticles is CoFe2O4. Mossbauer spectroscopy shows that the cation distributions are (Co0.38Fe0.62)[Co0.62Fe1.38]O-4. The MCS measurement, performed at 10 K, indicates that the magnetization of the nanoparticles is similar to magnetization of maghemite and magnetite. While the magnetization of the inverse spinels are in [111] direction, interestingly, the magnetization deduced from MCS is in [100] direction. The CoFe2O4-based ferrofluid is found to be stable at ambient conditions, which is important for applications. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Article
Erschienen: 2016
Creators: Kamali, Saeed and Pouryazdan, Mohsen and Ghafari, Mohammad and Itou, Masayoshi and Rahman, Masoud and Stroeve, Pieter and Hahn, Horst and Sakurai, Yoshiharu
Title: Magnetization and stability study of a cobalt-ferrite-based ferrofluid
Language: English
Abstract:

In this study the structural and magnetization properties of a CoFe2O4-based ferrofluid was investigated using x-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDS), Mossbauer spectroscopy, and magnetic Compton scattering (MCS) measurements. The XRD diagram indicates that the nanoparticles in the ferrofluid are inverse spinel and TEM graph shows that the ferrofluid consists of spherical nanoparticles with an average diameter of 18 +/- 1 nm, in good agreement with the size, 19.4 nm, extracted from line broadening of the XRD peaks. According to EDS measurements the composition of the nanoparticles is CoFe2O4. Mossbauer spectroscopy shows that the cation distributions are (Co0.38Fe0.62)[Co0.62Fe1.38]O-4. The MCS measurement, performed at 10 K, indicates that the magnetization of the nanoparticles is similar to magnetization of maghemite and magnetite. While the magnetization of the inverse spinels are in [111] direction, interestingly, the magnetization deduced from MCS is in [100] direction. The CoFe2O4-based ferrofluid is found to be stable at ambient conditions, which is important for applications. (C) 2015 Elsevier B.V. All rights reserved.

Journal or Publication Title: Journal of Magnetism and Magnetic Materials
Volume: 404
Publisher: Elsevier Science BV, Netherlands
Uncontrolled Keywords: Ferrofluid, Cobalt-ferrite, Nanoparticles, Mossbauer spectroscopy, Magnetic Compton scattering, Nano-magnetism
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 26 Jul 2017 12:21
Official URL: https://doi.org/10.1016/j.jmmm.2015.12.007
Identification Number: doi:10.1016/j.jmmm.2015.12.007
Funders: Saeed Kamali acknowledges Japan Society for the Promotion of Science for financial support.
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