Cation distribution and magnetic structure of the ferrimagnetic spinel NiCo2O4

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Marco, José F., Gancedo, J. Ramón, Gracia, Mercedes, Gautier, Juan Luis, Ríos, Edmundo I., Palmer, Helen M., 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
UEA Research Groups:	Faculty of Medicine and Health Sciences > Research Groups > Nutrition and Preventive Medicine Faculty of Science > Research Groups > Norwich Epidemiology Centre Faculty of Medicine and Health Sciences > Research Groups > Norwich Epidemiology Centre Faculty of Medicine and Health Sciences > Research Centres > Lifespan Health
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	12 Nov 2019 14:32
Last Modified:	06 Feb 2025 08:44
URI:	https://ueaeprints.uea.ac.uk/id/eprint/72945
DOI:	10.1039/b103135j

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