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

1 ŠVÁBENSKÁ Eva
Co-authors:
1,2 ROUPCOVÁ Pavla 1,2 HAVLÍČEK Lubomír 1 SCHNEEWEISS Oldřich
Institutions:
1 Institute of Physics of Materials, Czech Academy of Science, Brno, Czech Republic, EU, svabenska@ipm.cz
2 CEITEC Brno University of Technology, Brno, Czech Republic, EU
Conference:
15th International Conference on Nanomaterials - Research & Application, OREA Congress Hotel Brno, Czech Republic, EU, October 18 - 20, 2023
Proceedings:
Proceedings 15th International Conference on Nanomaterials - Research & Application
Pages:
76-81
ISBN:
978-80-88365-15-0
ISSN:
2694-930X
Published:
1st January 2024
Metrics:
377 views / 324 downloads
Abstract

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.

Keywords: Magnetic materials, thermal decomposition, Mössbauer spectroscopy

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