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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2017

Confidentiality

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

Name of the periodical

Journal of Physical Chemistry Part C: Nanomaterials and Interfaces

ISSN

1932-7447

e-ISSN

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Volume of the periodical

121

Issue of the periodical within the volume

21

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

11794-11803

UT code for WoS article

000402775200089

EID of the result in the Scopus database

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