Interstitial oxide ion conduction in (Ln (2-x) Zrx) Zr2O7+ delta (Ln= Nd, Sm)
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Date
2012-08-29
Journal Title
Journal ISSN
Volume Title
Publisher
International Union of Crystallography
Abstract
We have studied the structure and transport properties of (Ln2-xZrx)Zr2O7+x/2 (Ln= Nd, Sm; x=0; 0.2; 0.32; 0.39; 0.48; 0.67; 0.78; 0.96; 1.14; 1.27) solid solutions, which lie in the ZrO2-Ln2Zr2O7 (Ln= Nd, Sm) isomorphous miscibility range (33.3, 29, 26.6, 25.3, 23.5, 20, 18, 15, 12, 10 mol% Ln2O3) in the Nd2O3-ZrO2 (NdZrO) and Sm2O3-ZrO2 (SmZrO) systems.
Major attention has been focused on the structure and properties of pyrochlore-like (Ln2 xZrx)Zr2O7+x/2
(Ln=Nd, Sm) solid solutions with x = 0–0.78, which are thought to be potential interstitial oxide ion conductors. The crystal structure of the solid solutions has been investigated by X-ray and neutron diffraction techniques using Rietveld refinement, and their microstructure has been examined by SEM. The excess oxygen content of the (Ln2-xZrx)Zr2O7+x/2 (Ln= Nd, Sm; x=0.2;0.32) pyrochlore-like solid solutions has been determined by thermal analysis and mass spectrometry in a reducing atmosphere (H2/Ar-He). The transport properties of the solid solutions in the two systems have been studied by impedancespectroscopy in air. © International Union of Crystallography
Description
Keywords
Fluorite, Pyrochlore, Zirconium compounds, Vacancies, Oxygen, Interstitials
Citation
Shlyakhtina, A. V., Belov, D. A., Knotko, A. V., Avdeev, M., Kolbanev, I. V., Streletskii, A. N., & Shcherbakova, L. G. (2012). Interstitial oxide ion conduction in (Ln (2-x) Zrx) Zr2O7+ delta (Ln= Nd, Sm). Presentation to the 28th European Crystallography Meeting Warwick, United Kingdom, 25-29 August. In Acta Crystallographica Section A: Foundations and Advances, 69(a1), s181. doi:10.1107/S0108767313098450