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Title: Room-temperature ferromagnetism in cerium dioxide powders

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.
Authors:
; ; ;  [1]
  1. Kazan Federal University, Institute of Physics (Russian Federation)
Publication Date:
OSTI Identifier:
22472126
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 121; Journal Issue: 2; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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