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Structure and magnetic state of hydrothermally prepared Mn-Zn ferrite nanoparticles
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SYSNO ASEP 0552144 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Structure and magnetic state of hydrothermally prepared Mn-Zn ferrite nanoparticles Author(s) Kaman, Ondřej (FZU-D) RID, ORCID
Kubániová, D. (CZ)
Knížek, Karel (FZU-D) RID, ORCID
Kubíčková, Lenka (FZU-D) ORCID
Klementová, Mariana (FZU-D) RID, ORCID
Kohout, J. (CZ)
Jirák, Zdeněk (FZU-D) RID, ORCID, SAINumber of authors 7 Article number 161471 Source Title Journal of Alloys and Compounds. - : Elsevier - ISSN 0925-8388
Roč. 888, Dec. (2021)Number of pages 14 s. Language eng - English Country NL - Netherlands Keywords neutron diffraction ; Mossbauer spectroscopy ; superparamagnetism ; cation distribution ; magnetic nanoparticles ; metastable state Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Nano-materials (production and properties) R&D Projects LM2018110 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_019/0000760 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA19-02584S GA ČR - Czech Science Foundation (CSF) LM2018096 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure e-INFRA CZ - 90140 - CESNET, zájmové sdružení právnických osob Method of publishing Limited access Institutional support FZU-D - RVO:68378271 UT WOS 000705337400004 EID SCOPUS 85112841377 DOI 10.1016/j.jallcom.2021.161471 Annotation Magnetic behaviour of nanoparticles deviates from bulk not only due to finite-size and surface effects but it may be also affected by occurrence of metastable states, such as non-equilibrium cation distribution. The present study is devoted to hydrothermally prepared Mn-Zn ferrite nanoparticles with composition Mn1-xZnxFe2O4, where x = 0.21–0.63. Mössbauer spectroscopy and magnetometry provided insight into the blocking behaviour of particles on two dramatically different time scales and showed that Néel relaxation can be enhanced by increasing the zinc content. A selected sample was subjected to neutron diffraction study at 2 K to determine the ferrimagnetic order and in combination with Mössbauer spectroscopy to analyse the cation distribution. The non-zero occupancy of Zn2+ in octahedral sites evidenced a metastable distribution, and the DFT study revealed that the distribution of Mn2+ is non-equilibrium as well. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2022 Electronic address https://doi.org/10.1016/j.jallcom.2021.161471
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