Skip to main content

A Structural and Magnetic Investigation of the Inversion Degree in Ferrite Nanocrystals MFe2O4(M = Mn, Co, Ni)

Carta, Daniela, Casula, Maria Francesca, Falqui, Andrea, Loche, Danilo, Mountjoy, Gavin, Sangregorio, Claudio, Corrias, Anna (2009) A Structural and Magnetic Investigation of the Inversion Degree in Ferrite Nanocrystals MFe2O4(M = Mn, Co, Ni). Journal of Physical Chemistry C, 113 (20). pp. 8606-8615. ISSN 1932-7447. (doi:10.1021/jp901077c) (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) (KAR id:40471)

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. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1021/jp901077c

Abstract

The structural and magnetic properties of nanocrystalline manganese, cobalt, and nickel spinel ferrites dispersed in a highly porous SiO2 aerogel matrix were studied. X-ray diffraction and high-resolution transmission electron microscopy indicate that single crystalline ferrite nanoparticles are well dispersed in the amorphous matrix. The cation distribution between the octahedral and tetrahedral sites of the spinel structure was investigated by 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 spinel structure increases in the series Mn, Co, and Ni spinel, in accordance with the values commonly found in the corresponding bulk spinels. In particular, fitting of the EXAFS data indicates that the degree of inversion in nanosized ferrites is 0.20 for MnFe2O4, 0.68 for CoFe2O4, and 1.00 for NiFe2O4. Magnetic characterization further supports these findings.

Item Type: Article
DOI/Identification number: 10.1021/jp901077c
Subjects: Q Science > QC Physics
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Anna Corrias
Date Deposited: 07 Mar 2014 00:05 UTC
Last Modified: 27 Jan 2020 04:05 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/40471 (The current URI for this page, for reference purposes)
Mountjoy, Gavin: https://orcid.org/0000-0002-6495-2006
Corrias, Anna: https://orcid.org/0000-0002-5190-8196
  • Depositors only (login required):