Structure and magnetic state of hydrothermally prepared Mn-Zn ferrite nanoparticles

0552144 - FZÚ 2022 RIV NL eng J - Journal Article
Kaman, Ondřej - Kubániová, D. - Knížek, Karel - Kubíčková, Lenka - Klementová, Mariana - Kohout, J. - Jirák, Zdeněk
Structure and magnetic state of hydrothermally prepared Mn-Zn ferrite nanoparticles.
Journal of Alloys and Compounds. Roč. 888, Dec. (2021), č. článku 161471. ISSN 0925-8388. E-ISSN 1873-4669
R&D Projects: GA MŠMT LM2018110; GA MŠMT(CZ) EF16_019/0000760; GA ČR GA19-02584S; GA MŠMT(CZ) LM2018096
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Research Infrastructure: e-INFRA CZ - 90140
Institutional support: RVO:68378271
Keywords : neutron diffraction * Mossbauer spectroscopy * superparamagnetism * cation distribution * magnetic nanoparticles * metastable state
OECD category: Nano-materials (production and properties)
Impact factor: 6.371, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.jallcom.2021.161471

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.
Permanent Link: http://hdl.handle.net/11104/0327393