Tetragonal-Like Phase in Core-Shell Iron Iron-Oxide Nanoclusters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F17%3A73583182" target="_blank" >RIV/61989592:15310/17:73583182 - isvavai.cz</a>

Výsledek na webu

<a href="http://pubs.acs.org/doi/10.1021/acs.jpcc.7b01469" target="_blank" >http://pubs.acs.org/doi/10.1021/acs.jpcc.7b01469</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.7b01469" target="_blank" >10.1021/acs.jpcc.7b01469</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tetragonal-Like Phase in Core-Shell Iron Iron-Oxide Nanoclusters

Popis výsledku v původním jazyce

Two sizes of iron/iron-oxide (Fe/Fe-oxide) nanoclusters (NCs) of 10 and 35 nm diameters were prepared using a cluster deposition technique. Both these NCs displayed X-ray diffraction (XRD) peaks due to body-centered cubic (BCC) Fe-0 and magnetite-like phase. Fe-57 Mossbauer spectroscopy measurements confirmed (a) the core-shell nature of the NCs, (b) the Fe-oxide shell to be nanocrystalline and partially oxidized beyond magnetite, and (c) the Fe-oxide spins are significantly canted. In addition to the BCC Fe and magnetite-like phases, a phase similar to tetragonal sigma-Fe-Cr (8% Cr) was clearly evident in the larger NC, based on XRD. The origin of the tetragonal-like phase in the larger NC could be due to significant distortion of the Fe-0 core lattice planes; subtle peaks due to this phase were also apparent in the smaller NC. Unambiguous evidence for the presence of such a phase was not clear from X-ray photoelectron spectroscopy, vibrating sample magnetometry, X-ray magnetic circular dichroism, or transmission electron microscopy. Fe-57 Mossbauer spectroscopy, however, provided support for a non-BCC Fe-0 phase in the strongest sixth and the first resonance lines of the Fe-0 sextet. To our knowledge, this is the first report of a tetragonal-like phase in the Fe/Fe-oxide core-shell systems.

Název v anglickém jazyce

Tetragonal-Like Phase in Core-Shell Iron Iron-Oxide Nanoclusters

Popis výsledku anglicky

Two sizes of iron/iron-oxide (Fe/Fe-oxide) nanoclusters (NCs) of 10 and 35 nm diameters were prepared using a cluster deposition technique. Both these NCs displayed X-ray diffraction (XRD) peaks due to body-centered cubic (BCC) Fe-0 and magnetite-like phase. Fe-57 Mossbauer spectroscopy measurements confirmed (a) the core-shell nature of the NCs, (b) the Fe-oxide shell to be nanocrystalline and partially oxidized beyond magnetite, and (c) the Fe-oxide spins are significantly canted. In addition to the BCC Fe and magnetite-like phases, a phase similar to tetragonal sigma-Fe-Cr (8% Cr) was clearly evident in the larger NC, based on XRD. The origin of the tetragonal-like phase in the larger NC could be due to significant distortion of the Fe-0 core lattice planes; subtle peaks due to this phase were also apparent in the smaller NC. Unambiguous evidence for the presence of such a phase was not clear from X-ray photoelectron spectroscopy, vibrating sample magnetometry, X-ray magnetic circular dichroism, or transmission electron microscopy. Fe-57 Mossbauer spectroscopy, however, provided support for a non-BCC Fe-0 phase in the strongest sixth and the first resonance lines of the Fe-0 sextet. To our knowledge, this is the first report of a tetragonal-like phase in the Fe/Fe-oxide core-shell systems.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physical Chemistry Part C: Nanomaterials and Interfaces

ISSN

1932-7447

e-ISSN

—

Svazek periodika

121

Číslo periodika v rámci svazku

21

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

11794-11803

Kód UT WoS článku

000402775200089

EID výsledku v databázi Scopus

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