Formation and cation distribution in supported manganese ferrite nanoparticles: An X-ray absorption study

Carta, D. and Casula, M.F. and Mountjoy, G. and Corrias, A. (2008) Formation and cation distribution in supported manganese ferrite nanoparticles: An X-ray absorption study. Physical Chemistry Chemical Physics, 10 (21). pp. 3108-3117. ISSN 1463-9076. (doi:https://doi.org/10.1039/b800359a) (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/b800359a

Abstract

Extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) techniques at both Fe and Mn K-edges were used to investigate the formation of MnFe2O4 nanoparticles embedded in a silica aerogel matrix as a function of calcination temperature (at 450, 750 and 900°C). Up to 450°C, two separated highly-disordered phases of iron and manganese are present. With increasing the temperature (to 750 and 900°C), the structure of aerogel nanoparticles becomes progressively similar to that of the spinel structure MnFe2O4 (jacobsite). Quantitative determination of cations distribution in the spinel structure shows that aerogels calcined at 750 and 900°C have a degree of inversion i = 0.20. A pure jacobsite sample synthesised by co-precipitation and used as a reference compound shows a much higher degree of inversion (i = 0.70). The different distribution of iron and manganese cations in the octahedral and tetrahedral sites in pure jacobsite and in the aerogels can be ascribed to partial oxidation of Mn2+ to Mn3+ in pure jacobsite, confirmed by XANES analysis, probably due to the synthesis conditions.

Item Type: Article
Uncontrolled keywords: cation, ferric ion, ferrite, manganese, metal nanoparticle, absorption, article, chemistry, gel, spectroscopy, temperature, X ray diffraction, Absorption, Cations, Ferric Compounds, Gels, Manganese, Metal Nanoparticles, Spectrum Analysis, Temperature, X-Ray Diffraction
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 11:58 UTC
Last Modified: 04 Dec 2017 12:39 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46219 (The current URI for this page, for reference purposes)
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