Room-temperature ferromagnetism in cerium dioxide powders

Journal Article · Sat Aug 15 00:00:00 EDT 2015 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776115080221· OSTI ID:22472126

Pavlov, V. V.; Semashko, V. V.; Korableva, S. L. ^[1]

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1. Kazan Federal University, Institute of Physics (Russian Federation)

Room-temperature ferromagnetism is detected in a CeO{sub 2} powder with a grain size of about 35 nm and a low (<0.1 at %) manganese and iron content. The ferromagnetism in a CeO{sub 2} sample with a submicron crystallite size and the same manganese and iron impurity content is lower than in the nanocrystalline sample by an order of magnitude. Apart from ferromagnetism, both samples exhibit EPR spectra of localized paramagnetic centers, the concentration of which is lower than 0.01 at %. A comparative analysis of these results shows that the F-center exchange (FCE) mechanism cannot cause ferromagnetism. This conclusion agrees with the charge-transfer ferromagnetism model proposed recently.

• OSTI ID: 22472126
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 121, Issue 2; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
CERIUM OXIDES
CONCENTRATION RATIO
CRYSTALS
ELECTRON SPIN RESONANCE
F CENTERS
FERROMAGNETISM
GRAIN SIZE
IRON
MANGANESE
NANOSTRUCTURES
PARAMAGNETISM
POWDERS
TEMPERATURE RANGE 0273-0400 K