Magnetic, FMR and mössbauer studies of nanocrystalline greigite

Iron sulphide Fe3S4, known as the mineral greigite, has been prepared in two distinct nanocrystalline forms with the mean crystallite size of dXRD ≈ 30 and 80 nm via hydrothermal synthesis by using two different surfactants (oleic acid and cetyltrimethylammonium bromide). Their crystallinity and pha...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-03, Vol.857, p.157569, Article 157569
Main Authors: Pashchenko, Mariia, Veverka, Pavel, Kmječ, Tomáš, Kaman, Ondřej, Kubíčková, Lenka, Kohout, Jaroslav, Klementová, Mariana, Kravchuk, Olha, Vakula, Arthur, Tarapov, Sergey, Hejtmánek, Jiří, Knížek, Karel
Format: Article
Language:English
Subjects:
57Fe Mössbauer spectroscopy
Cetyltrimethylammonium bromide
Crystallites
Ferromagnetic resonance
Ferromagnetism
Greigite
Iron 57
Iron sulfides
Magnetic measurement
Mossbauer spectroscopy
Nanocrystals
Oleic acid
Spectrum analysis
Superconducting quantum interference devices
Superparamagnetic and blocked state
Temperature
Temperature dependence
Thiospinel
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Summary:Iron sulphide Fe3S4, known as the mineral greigite, has been prepared in two distinct nanocrystalline forms with the mean crystallite size of dXRD ≈ 30 and 80 nm via hydrothermal synthesis by using two different surfactants (oleic acid and cetyltrimethylammonium bromide). Their crystallinity and phase purity are probed by X-ray diffraction and Mössbauer spectroscopy. For detailed characterization of the ferrimagnetic state and its temperature evolution, the SQUID magnetometry, ferromagnetic resonance and the temperature dependence of 57Fe Mössbauer spectra are used. The blocking behaviour of the nanocrystalline samples is discussed with respect to magnetic and Mössbauer data. Moreover, special attention is given to the analysis of temperature-dependent data, which reveals that: first, spin reorientation associated with the change in easy axis from 110 to 111 on cooling occurs at ≈100 K, secondly, Verwey-like transition is not present. •Greigite crystallites with dXRD ≈30 and 80 nm were prepared by hydrothermal method.•Ferrimagnetic order was characterized by spontaneous moments 3.08 and 3.28 μB per formula unit.•Ferromagnetic resonance showed different behaviour of the two samples.•Temperature-dependent Mössbauer spectroscopy indicated spin-reorientation transition.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.157569