Magnetic Nanoparticles with Fe-N and Fe-C Cores and Carbon Shells Synthesized at High Pressures

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dc.citation.articleNumber7063
dc.citation.issueNumber22
dc.citation.journalTitleMaterials
dc.citation.volumeNumber16
dc.contributor.authorBagramov, Rustem H.
dc.contributor.authorFilonenko, Vladimir P.
dc.contributor.authorZibrov, Igor P.
dc.contributor.authorSkryleva, Elena A.
dc.contributor.authorKulnitskiy, Boris A.
dc.contributor.authorBlank, Vladimir D.
dc.contributor.authorKhabashesku, Valery N.
dc.date.accessioned2024-05-03T15:51:12Z
dc.date.available2024-05-03T15:51:12Z
dc.date.issued2023
dc.description.abstractNanoparticles of iron carbides and nitrides enclosed in graphite shells were obtained at 2 ÷ 8 GPa pressures and temperatures of around 800 °C from ferrocene and ferrocene–melamine mixture. The average core–shell particle size was below 60 nm. The graphite-like shells over the iron nitride cores were built of concentric graphene layers packed in a rhombohedral shape. It was found that at a pressure of 4 GPa and temperature of 800 °C, the stability of the nanoscale phases increases in a Fe7C3 > Fe3C > Fe3N1+x sequence and at 8 GPa in a Fe3C > Fe7C3 > Fe3N1+x sequence. At pressures of 2 ÷ 8 GPa and temperatures up to 1600 °C, iron nitride Fe3N1+x is more stable than iron carbides. At 8 GPa and 1600 °C, the average particle size of iron nitride increased to 0.5 ÷ 1 μm, while simultaneously formed free carbon particles had the shape of graphite discs with a size of 1 ÷ 2 μm. Structural refinement of the iron nitride using the Rietveld method gave the best result for the space group P6322. The refined composition of the samples obtained from a mixture of ferrocene and melamine at 8 GPa/800 °C corresponded to Fe3N1.208, and at 8 GPa/1650 °C to Fe3N1.259. The iron nitride core–shell nanoparticles exhibited magnetic behavior. Specific magnetization at 7.5 kOe of pure Fe3N1.208 was estimated to be 70 emu/g. Compared to other methods, the high-pressure method allows easy synthesis of the iron nitride cores inside pure carbon shells and control of the particle size. And in general, pressure is a good tool for modifying the phase and chemical composition of the iron-containing cores.
dc.identifier.citationBagramov, R. H., Filonenko, V. P., Zibrov, I. P., Skryleva, E. A., Kulnitskiy, B. A., Blank, V. D., & Khabashesku, V. N. (2023). Magnetic Nanoparticles with Fe-N and Fe-C Cores and Carbon Shells Synthesized at High Pressures. Materials, 16(22), Article 22. https://doi.org/10.3390/ma16227063
dc.identifier.digitalmaterials-16-07063-v2
dc.identifier.doihttps://doi.org/10.3390/ma16227063
dc.identifier.urihttps://hdl.handle.net/1911/115564
dc.language.isoeng
dc.publisherMDPI
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleMagnetic Nanoparticles with Fe-N and Fe-C Cores and Carbon Shells Synthesized at High Pressures
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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