| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Berry, Frank
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2020Synthesis and characterisation of Sr4Fe3-xCrxO10-δ citations
- 2017Topotactic fluorine insertion into the channels of FeSb2O4-related materials.citations
- 2012Low temperature fluorination of Sr3Fe2O7-x with polyvinylidine fluoride: An X-ray powder diffraction and Mossbauer spectroscopy studycitations
- 2011The synthesis, structure, magnetic and electrical properties of FeSb2-xPbxO4citations
- 2011Structure and magnetic properties of the cubic oxide fluoride BaFeO2Fcitations
- 2010The ionic conductivity and local environment of cations in Bi9ReO17citations
- 2010LaSrCoFeO5, LaSrCoFeO5F and LaSrCoFeO5.5: new La-Sr-Co-Fe perovskitescitations
- 2009Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4−δ (M=Fe, Mn)citations
- 2001Investigation of defect structures formed by doping tetravalent ions into spinel-related iron oxides using atomistic simulation calculationscitations
- 2001Cation distribution and magnetic structure of the ferrimagnetic spinel NiCO₂O₄citations
Places of action
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article
Cation distribution and magnetic structure of the ferrimagnetic spinel NiCO₂O₄
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 {Ni0.13+Co0.92+}(tet)[Ni0.93.5+Co1.12.5+](oct)O-4. 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+.