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Origin of the large dispersion of magnetic properties in nanostructured oxides: FexO/Fe3O4 nanoparticles as a case study Estrader i Bofarull, Marta López-Ortega, Alberto Golosovsky, Igor V. Estradé Albiol, Sònia Roca, Alejandro G. Salazar-Alvarez, German López Conesa, Lluís Tobia, Dina Winkler, Elin Ardisson, José D. Macedo, Waldemar A. A. Morphis, Andreas Vasilakaki, Marianna Trohidou, Kalliopi N. Gukasov, Arsen Mirebeau, Isabelle Makarova, O. L. Zysler, Roberto D. Peiró Martínez, Francisca Baró, M. D. Bergström, Lennart Nogués, Josep Òxids Nanopartícules Propietats magnètiques Oxides Nanoparticles Magnetic properties The intimate relationship between stoichiometry and physicochemical properties in transition-metal oxides makes them appealing as tunable materials. These features become exacerbated when dealing with nanostructures. However, due to the complexity of nanoscale materials, establishing a distinct relationship between structure-morphology and functionalities is often complicated. In this regard, in the FexO/Fe3O4 system a largely unexplained broad dispersion of magnetic properties has been observed. Here we show, thanks to a comprehensive multi-technique approach, a clear correlation between the magneto-structural properties in large (45 nm) and small (9 nm) FexO/Fe3O4 core/shell nanoparticles that can explain the spread of magnetic behaviors. The results reveal that while the FexO core in the large nanoparticles is antiferromagnetic and has bulk-like stoichiometry and unit-cell parameters, the FexO core in the small particles is highly non-stoichiometric and strained, displaying no significant antiferromagnetism. These results highlight the importance of ample characterization to fully understand the properties of nanostructured metal oxides. 2020-04-02T15:56:55Z 2020-04-02T15:56:55Z 2015-12-31 2020-04-02T15:56:55Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 2040-3364 https://hdl.handle.net/2445/154884 645705 eng Versió postprint del document publicat a: https://doi.org/10.1039/C4NR06351A Nanoscale, 2015, vol. 7, p. 3002-3015 https://doi.org/10.1039/C4NR06351A info:eu-repo/grantAgreement/EC/FP7/247518/EU//ONDA (c) Estrader i Bofarull, Marta et al., 2015 info:eu-repo/semantics/openAccess 14 p. application/pdf Royal Society of Chemistry Articles publicats en revistes (Química Inorgànica i Orgànica)