Structural stability and local electronic properties of some EC synthesized magnetite nanopowders
Само за регистроване кориснике
2017
Аутори
Radisavljević, IvanaKuzmanović, Bojana
Novaković, Nikola
Mahnke, Heinz-Eberhard
Vulićević, Lj.
Kurko, Sandra V.
Ivanović, Nenad
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Structural and electronic properties, oxidation and aging effect of electrochemically (EC) synthesized magnetite nanopowders (NPs) are studied by means of X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) and X-ray magnetic circular dichroism (XMCD). The obtained results enabled to get a direct insight into the structure and electronic properties of Fe immediate surrounding and to elucidate the influence of preparation conditions on stoichiometry of NPs and their stability in ambient conditions. All investigated NPs are produced as nonestoichiometric Fe3-delta O4 oxide phases, with the lattice constant and the Fe2+/Fe3+ ratio both in-between the values for bulk maghemite and magnetite. NPs synthesized under smaller current density (J = 200 mA/dm(2)) are more magnetite-alike, whereas larger current density (J = 1000 mA/dm(2)) has led to formation of NPs closer to maghemite. Oxidation of magnetite-like NPs is slower, although in the course of time particles agglomerate and ...oxide penetrates into the core. Maghemite-like NPs oxidize much faster and the oxide layer which is confined close to the particles surface protects the core from further oxidation. In all NPs the fist coordination around Fe is pretty stable against both temperature and oxidation process. The temperature change from 293 K to 20 K considerably affects the second coordination around Fe, which is most likely a consequence of the Verwey transition present in all investigated samples. (C) 2016 Elsevier B.V. All rights reserved.
Кључне речи:
Oxides / Nanostructures / Chemical synthesis / Electronic structure / XAFSИзвор:
Journal of Alloys and Compounds, 2017, 697, 409-416Финансирање / пројекти:
DOI: 10.1016/j.jallcom.2016.11.090
ISSN: 0925-8388; 1873-4669
WoS: 000391820800053
Scopus: 2-s2.0-85008190880
Колекције
Институција/група
VinčaTY - JOUR AU - Radisavljević, Ivana AU - Kuzmanović, Bojana AU - Novaković, Nikola AU - Mahnke, Heinz-Eberhard AU - Vulićević, Lj. AU - Kurko, Sandra V. AU - Ivanović, Nenad PY - 2017 UR - https://vinar.vin.bg.ac.rs/handle/123456789/1383 AB - Structural and electronic properties, oxidation and aging effect of electrochemically (EC) synthesized magnetite nanopowders (NPs) are studied by means of X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) and X-ray magnetic circular dichroism (XMCD). The obtained results enabled to get a direct insight into the structure and electronic properties of Fe immediate surrounding and to elucidate the influence of preparation conditions on stoichiometry of NPs and their stability in ambient conditions. All investigated NPs are produced as nonestoichiometric Fe3-delta O4 oxide phases, with the lattice constant and the Fe2+/Fe3+ ratio both in-between the values for bulk maghemite and magnetite. NPs synthesized under smaller current density (J = 200 mA/dm(2)) are more magnetite-alike, whereas larger current density (J = 1000 mA/dm(2)) has led to formation of NPs closer to maghemite. Oxidation of magnetite-like NPs is slower, although in the course of time particles agglomerate and oxide penetrates into the core. Maghemite-like NPs oxidize much faster and the oxide layer which is confined close to the particles surface protects the core from further oxidation. In all NPs the fist coordination around Fe is pretty stable against both temperature and oxidation process. The temperature change from 293 K to 20 K considerably affects the second coordination around Fe, which is most likely a consequence of the Verwey transition present in all investigated samples. (C) 2016 Elsevier B.V. All rights reserved. T2 - Journal of Alloys and Compounds T1 - Structural stability and local electronic properties of some EC synthesized magnetite nanopowders VL - 697 SP - 409 EP - 416 DO - 10.1016/j.jallcom.2016.11.090 ER -
@article{ author = "Radisavljević, Ivana and Kuzmanović, Bojana and Novaković, Nikola and Mahnke, Heinz-Eberhard and Vulićević, Lj. and Kurko, Sandra V. and Ivanović, Nenad", year = "2017", abstract = "Structural and electronic properties, oxidation and aging effect of electrochemically (EC) synthesized magnetite nanopowders (NPs) are studied by means of X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) and X-ray magnetic circular dichroism (XMCD). The obtained results enabled to get a direct insight into the structure and electronic properties of Fe immediate surrounding and to elucidate the influence of preparation conditions on stoichiometry of NPs and their stability in ambient conditions. All investigated NPs are produced as nonestoichiometric Fe3-delta O4 oxide phases, with the lattice constant and the Fe2+/Fe3+ ratio both in-between the values for bulk maghemite and magnetite. NPs synthesized under smaller current density (J = 200 mA/dm(2)) are more magnetite-alike, whereas larger current density (J = 1000 mA/dm(2)) has led to formation of NPs closer to maghemite. Oxidation of magnetite-like NPs is slower, although in the course of time particles agglomerate and oxide penetrates into the core. Maghemite-like NPs oxidize much faster and the oxide layer which is confined close to the particles surface protects the core from further oxidation. In all NPs the fist coordination around Fe is pretty stable against both temperature and oxidation process. The temperature change from 293 K to 20 K considerably affects the second coordination around Fe, which is most likely a consequence of the Verwey transition present in all investigated samples. (C) 2016 Elsevier B.V. All rights reserved.", journal = "Journal of Alloys and Compounds", title = "Structural stability and local electronic properties of some EC synthesized magnetite nanopowders", volume = "697", pages = "409-416", doi = "10.1016/j.jallcom.2016.11.090" }
Radisavljević, I., Kuzmanović, B., Novaković, N., Mahnke, H., Vulićević, Lj., Kurko, S. V.,& Ivanović, N.. (2017). Structural stability and local electronic properties of some EC synthesized magnetite nanopowders. in Journal of Alloys and Compounds, 697, 409-416. https://doi.org/10.1016/j.jallcom.2016.11.090
Radisavljević I, Kuzmanović B, Novaković N, Mahnke H, Vulićević L, Kurko SV, Ivanović N. Structural stability and local electronic properties of some EC synthesized magnetite nanopowders. in Journal of Alloys and Compounds. 2017;697:409-416. doi:10.1016/j.jallcom.2016.11.090 .
Radisavljević, Ivana, Kuzmanović, Bojana, Novaković, Nikola, Mahnke, Heinz-Eberhard, Vulićević, Lj., Kurko, Sandra V., Ivanović, Nenad, "Structural stability and local electronic properties of some EC synthesized magnetite nanopowders" in Journal of Alloys and Compounds, 697 (2017):409-416, https://doi.org/10.1016/j.jallcom.2016.11.090 . .