Journal
SOLID STATE IONICS
Volume 225, Issue -, Pages 488-492Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2012.02.039
Keywords
Ceria; Scandium; Oxygen dynamics; Solid state Sc-45 NMR
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In this work we investigate the solubility of scandium in ceria, and present a detailed investigation of oxygen dynamics in 0.5% scandium doped ceria from 50K to 1073 K by Sc-45 solid state NMR line shape, chemical shift, and spin-lattice relaxation analysis. We show that oxygen vacancy is strongly attached to the scandium in the seven-coordinated scandium-oxygen vacancy complex (7-Sc), but even at room temperature the vacancy is moving freely around the scandium atom between eight equivalent sites in millisecond time scale. The activation energy of that vacancy jump is 0.37 eV. The eight-coordinated (8-Sc) scandium ion retains cubic environment down to 50K. The exchange rate between 7-Sc and 8-Sc sites exceeds 10(3) Hz above T>600 K. (C) 2012 Elsevier B.V. All rights reserved.
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