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An X-ray Absorption Spectroscopy Study of the Inversion Degree in Zinc Ferrite Nanocrystals Dispersed on a Highly Porous Silica Aerogel Matrix

Carta, Daniela, Marras, C, Loche, D, Mountjoy, G, Ahmed, S and Corrias, A (2013) An X-ray Absorption Spectroscopy Study of the Inversion Degree in Zinc Ferrite Nanocrystals Dispersed on a Highly Porous Silica Aerogel Matrix Journal of Chemical Physics, 138. 054702-1-054702-9.

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Abstract

The structural properties of zinc ferrite nanoparticles with spinel structure dispersed in a highly porous SiO2 aerogel matrix were compared with a bulk zinc ferrite sample. In particular, the details of the cation distribution between the octahedral (B) and tetrahedral (A) sites of the spinel structure were determined using X-ray absorption spectroscopy. The analysis of both the X-ray absorption near edge structure and the extended X-ray absorption fine structure indicates that the degree of inversion of the zinc ferrite spinel structures varies with particle size. In particular, in the bulk microcrystalline sample, Zn2+ ions are at the tetrahedral sites and trivalent Fe3+ ions occupy octahedral sites (normal spinel). When particle size decreases, Zn2+ ions are transferred to octahedral sites and the degree of inversion is found to increase as the nanoparticle size decreases. This is the first time that a variation of the degree of inversion with particle size is observed in ferrite nanoparticles grown within an aerogel matrix.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Carta, Danielad.carta@surrey.ac.ukUNSPECIFIED
Marras, CUNSPECIFIEDUNSPECIFIED
Loche, DUNSPECIFIEDUNSPECIFIED
Mountjoy, GUNSPECIFIEDUNSPECIFIED
Ahmed, SUNSPECIFIEDUNSPECIFIED
Corrias, AUNSPECIFIEDUNSPECIFIED
Date : 1 February 2013
Identification Number : 10.1063/1.4789479
Copyright Disclaimer : © 2013 American Institute of Physics.
Depositing User : Jane Hindle
Date Deposited : 31 Aug 2017 09:05
Last Modified : 31 Aug 2017 09:05
URI: http://epubs.surrey.ac.uk/id/eprint/842094

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