PROPERTIES OF NANOCRYSTALLINE FE-NI PARTICLES PREPARED BY THERMAL REDUCTION OF OXALATE PRECURSORS

0584952 - ÚFM 2025 RIV CZ eng C - Conference Paper (international conference)
Švábenská, Eva - Roupcová, Pavla - Havlíček, Lubomír - Schneeweiss, Oldřich
PROPERTIES OF NANOCRYSTALLINE FE-NI PARTICLES PREPARED BY THERMAL REDUCTION OF OXALATE PRECURSORS.
NANOCON 2023 Conference Proceedings. Ostrava: Ostrava : Tanger Ltd., 2024, 2024, s. 76-81. ISBN 978-80-88365-15-0. ISSN 2694-930X.
[NANOCON 2023 - International Conference on Nanomaterials - Research & Application /15./. Brno (CZ), 18.10.2023-20.10.2023]
Institutional support: RVO:68081723
Keywords : Magnetic materials * thermal decomposition * Mössbauer spectroscopy
OECD category: Materials engineering

Recent technological advancements require development of cost-effective and high-performance magnets
which ideally do not contain rare earth metals or noble metals. The promising candidates are Fe-Ni-based
alloys, in particular, the Fe50Ni50 L10 phase (tetrataenite), which has a great perspective for producing hard
magnetic materials. Our study explores a promising method for preparing nanoparticles of Fe-Ni alloy from an
iron-nickel oxalate precursor. The coprecipitation method was employed to prepare oxalate precursors,
followed by controlled thermal decomposition in a reducing hydrogen atmosphere. The morphology and
properties of the resulting particles were analysed using scanning electron microscopy (SEM) coupled with
energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Mössbauer spectroscopy (MS), and
magnetic measurements.
The SEM analysis revealed that the particles have approximately cube-shaped unit cell morphology with a
size in a range of 1 - 2 μm. Upon annealing, the samples contain multiple phases with varying Fe-Ni content.
Magnetic measurements confirmed the formation of magnetically suitable Fe-Ni phases in the samples after
annealing. Mössbauer spectroscopy emerged as a highly effective method for characterizing individual phases
of the Fe-Ni system.
Permanent Link: https://hdl.handle.net/11104/0352750