Synthesis and microstructure of manganese ferrite colloidal nanocrystals

Carta, D. and Casula, M.F. and Floris, P. and Falqui, A. and Mountjoy, G. and Boni, A. and Sangregorio, C. and Corrias, A. (2010) Synthesis and microstructure of manganese ferrite colloidal nanocrystals. Physical Chemistry Chemical Physics, 12 (19). pp. 5074-5083. ISSN 1463-9076. (doi:https://doi.org/10.1039/b922646j) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1039/b922646j

Abstract

The atomic level structure of a series of monodisperse single crystalline nanoparticles with a magnetic core of manganese ferrite was studied using X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) techniques at both the Fe and Mn K-edges, and conventional and high resolution transmission electron microscopy (TEM and HRTEM). In particular, insights on the non-stoichiometry and on the inversion degree of manganese ferrite nanocrystals of different size were obtained by the use of complementary structural and spectroscopic characterization techniques. The inversion degree of the ferrite nanocrystals, i.e. the cation distribution between the octahedral and tetrahedral sites in the spinel structure, was found to be much higher (around 0.6) than the literature values reported for bulk stoichiometric manganese ferrite (around 0.2). The high inversion degree of the nanoparticles is ascribed to the partial oxidation of Mn2+ to Mn3+ which was evidenced by XANES, leading to non-stoichiometric manganese ferrite.

Item Type: Article
Subjects: Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Anna Corrias
Date Deposited: 17 Dec 2014 11:44 UTC
Last Modified: 04 Dec 2017 12:37 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46209 (The current URI for this page, for reference purposes)
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