Cation distribution and magnetic structure of the ferrimagnetic spinel NiCo2O4

Marco, José F., Gancedo, J. Ramón, Gracia, Mercedes, Gautier, Juan Luis, Ríos, Edmundo I., Palmer, Helen M. ORCID: https://orcid.org/0000-0002-7184-269X, Greaves, Colin and Berry, Frank J. (2001) Cation distribution and magnetic structure of the ferrimagnetic spinel NiCo2O4. Journal of Materials Chemistry, 11 (12). pp. 3087-3093. ISSN 0959-9428

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Abstract

The compound NiCo2O4, with spinel-related structure, has been prepared by thermal decomposition of metal nitrates and its bulk structural properties examined by means of magnetic measurements, neutron diffraction, X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). The results suggest a delocalised electron distribution on the octahedral sites with average oxidation states of +3.5 and +2.5 for nickel and cobalt, respectively, and lead to a cation distribution for NiCo2O4 of (Ni3+0.1Co2+0.9)tet [Ni3.5+0.9Co2.5+1.1] octO4. This electronic configuration is consistent with magnetisation measurements if applied magnetic fields cause a charge redistribution on the octahedral sites to favour Co3+ and Ni3+. The surface of NiCo2O4 was examined by X-ray photoelectron spectroscopy (XPS) and found to have a different composition containing Co2+, Co3+, Ni2+, Ni3+ and, probably, Ni4+.

Item Type: Article
Uncontrolled Keywords: chemistry(all),materials chemistry ,/dk/atira/pure/subjectarea/asjc/1600
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
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Depositing User: LivePure Connector
Date Deposited: 12 Nov 2019 14:32
Last Modified: 22 Oct 2022 05:27
URI: https://ueaeprints.uea.ac.uk/id/eprint/72945
DOI: 10.1039/b103135j

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