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Identifying the presence of magnetite in an ensemble of iron-oxide nanoparticles: a comparative neutron diffraction study between bulk and nanoscale

Abstract: Scientific interest in iron-oxides and in particular magnetite has been renewed due to the broad scope of their fascinating properties, which are finding applications in electronics and biomedicine. Specifically, iron oxide nanoparticles (IONPs) are gathering attraction in biomedicine. Their cores are usually constituted by a mixture of maghemite and magnetite phases. In view of this, to fine-tune the properties of an ensemble of IONPs towards their applications, it is essential to enhance mass fabrication processes towards the production of monodisperse IONPs with controlled size, shape, and stoichiometry. We exploit the vacancy sensitivity of the Verwey transition to detect the presence of magnetite. Here we provide direct evidence for the Verwey transition in an ensemble of IONPs through neutron diffraction. This transition is observed as a variation in the Fe magnetic moment at octahedral sites and, in turn, gives rise to a change of the net magnetic moment. Finally, we show this variation as the microscopic ingredient driving the characteristic kink that hallmarks the Verwey transition in thermal variation of magnetization.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Nanoscale advances, 2021, 3 (12), 3491-3496

Editorial: Royal Society of Chemistry

 Fecha de publicación: 01/06/2021

Nº de páginas: 6

Tipo de publicación: Artículo de Revista

 DOI: 10.1039/d0na00830c

ISSN: 2516-0230

Proyecto español: MAT2017-83631-C3-R

Proyecto europeo: info:eu-repo/grantAgreement/EC/FP7/604448/EU/Nanometrology Standardization Methods for Magnetic Nanoparticles/NanoMag/

Autores/as

GAVILÁN, H.

ZENG, L.J.

FERNÁNDEZ-DÍAZ, M.T.

SUBÍAS PERUGA, MARÍA GLORIA

PHILIPP FLORIAN BENDER

JOHANSSON, C.