Synthesis and microstructure of manganese ferrite colloidal nanocrystals

Literature Information

Publication Date 2010-04-08
DOI 10.1039/B922646J
Impact Factor 3.676
Authors

D. Carta, M. F. Casula, P. Floris, A. Falqui, G. Mountjoy, A. Boni, C. Sangregorio, A. Corrias


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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.

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2017-01-19 Paper

DOI: 10.1039/C6AN02437H

Front cover

Cover

DOI: 10.1039/C6AN90099B

Inside front cover

Cover

DOI: 10.1039/C7AN90015E

Back cover

Cover

DOI: 10.1039/C6AN90097F

Contents list

Front/Back Matter

DOI: 10.1039/C7AN90003A

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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