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- Title
EPR study of nanocrystalline CeO<sub>2</sub> exhibiting ferromagnetism at room temperature.
- Authors
Rakhmatullin, R. M.; Pavlov, V. V.; Semashko, V. V.
- Abstract
Electron paramagnetic resonance (EPR) spectroscopy complemented with X-ray diffraction, X-ray fluorescence, and optical spectroscopy was used to study nanocrystalline CeO2 powder samples that exhibit weak room-temperature ferromagnetism. EPR lines assigned to the Ce3+ trigonal sites were found for the first time in cerium dioxide that contains a trace impurity of Mn2+. This finding indicates that manganese dopant facilitates the conversion of the oxidation state of Ce4+ to Ce3+ in nanocrystalline CeO2. Our results support the view that Ce3+/Ce4+ pairs along with defects on the surface of nanoparticles are responsible for the ferromagnetism in CeO2. The EPR study reveals that the charge-transfer mechanism proposed recently is more suitable to explain the origin of room-temperature ferromagnetism in CeO2 than the F+-centers exchange interactions.
- Subjects
CERIUM oxide crystals; ELECTRON paramagnetic resonance spectroscopy; FERROMAGNETISM; TEMPERATURE effect; OXIDATION states; MANGANESE; OPTICAL spectroscopy; NANOCRYSTALS spectra
- Publication
Physica Status Solidi (B), 2016, Vol 253, Issue 3, p499
- ISSN
0370-1972
- Publication type
Article
- DOI
10.1002/pssb.201552542