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., 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

Full text not available from this repository. (Request a copy)

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
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 12 Nov 2019 14:32
Last Modified: 23 Sep 2020 23:55
URI: https://ueaeprints.uea.ac.uk/id/eprint/72945
DOI: 10.1039/b103135j

Actions (login required)

View Item View Item