Молимо вас користите овај идентификатор за цитирање или овај линк до ове ставке: https://scidar.kg.ac.rs/handle/123456789/8941
Назив: Structural stability and local electronic properties of some EC synthesized magnetite nanopowders
Аутори: Radisavljević, Ivana
Kuzmanović B.
Novaković, Nikola
Mahnke H.
Vulićević Lј.
Kurko, Sandra
Ivanovic, Nenad
Датум издавања: 2017
Сажетак: © 2016 Elsevier B.V. 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 non–stoichiometric Fe3−δO4oxide 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/dm2) are more magnetite–alike, whereas larger current density (J = 1000 mA/dm2) 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.
URI: https://scidar.kg.ac.rs/handle/123456789/8941
Тип: article
DOI: 10.1016/j.jallcom.2016.11.090
ISSN: 0925-8388
SCOPUS: 2-s2.0-85008190880
Налази се у колекцијама:Faculty of Technical Sciences, Čačak

Број прегледа

108

Број преузимања

8

Датотеке у овој ставци:
Датотека Опис ВеличинаФормат 
10.1016-j.jallcom.2016.11.090.pdf579.17 kBAdobe PDFСличица
Погледајте


Ова ставка је заштићена лиценцом Креативне заједнице Creative Commons