Interfacial strain and defects in asymmetric Fe-Mn oxide hybrid nanoparticles

Asymmetric Fe-Mn oxide hybrid nanoparticles have been obtained by a seed-mediated thermal decomposition-based synthesis route. The use of benzyl ether as the solvent was found to promote the orientational growth of Mn 1− x O onto the iron oxide nanocube seeds yielding mainly dimers and trimers where...

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Bibliographic Details
Published in:Nanoscale 2016-01, Vol.8 (29), p.14171-14177
Main Authors: Mayence, Arnaud, Wéry, Madeleine, Tran, Dung Trung, Wetterskog, Erik, Svedlindh, Peter, Tai, Cheuk-Wai, Bergström, Lennart
Format: Article
Language:English
Subjects:
Asymmetry
Crystal defects
Dimers
Iron oxides
Nanoparticles
Nanostructure
Oxides
Seeds
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Summary:Asymmetric Fe-Mn oxide hybrid nanoparticles have been obtained by a seed-mediated thermal decomposition-based synthesis route. The use of benzyl ether as the solvent was found to promote the orientational growth of Mn 1− x O onto the iron oxide nanocube seeds yielding mainly dimers and trimers whereas 1-octadecene yields large nanoparticles. HRTEM imaging and HAADF-STEM tomography performed on dimers show that the growth of Mn 1− x O occurs preferentially along the edges of iron oxide nanocubes where both oxides share a common crystallographic orientation. Fourier filtering and geometric phase analysis of dimers reveal a lattice mismatch of 5% and a large interfacial strain together with a significant concentration of defects. The saturation magnetization is lower and the coercivity is higher for the Fe-Mn oxide hybrid nanoparticles compared to the iron oxide nanocube seeds. Asymmetric Fe-Mn oxide hybrid nanoparticles were obtained by facet-selective seed-mediated synthesis and their interfacial strain and defects were investigated.
ISSN:2040-3364
2040-3372
2040-3372
DOI:10.1039/c6nr01373b