Abstract
The local structures of the fluorite and pyrochlore compounds in the system (1-x)ZrO 2-xGdO 1.5 (0.20≤×0.62) have been studied by means of EXAFS spectroscopy. The EXAFS results indicate that trivalent Gd ions are 8-coordinated in both the fluorite-type and the pyrochlore-type solid solutions in the compositional range 0.2≤×0.5, and that the mean coordination number of tetravalent Zr ions decreases from eight to six with increasing Gd content. This indicates that the oxygen vacancies are located adjacent to tetravalent Zr ions. Cluster models which are a part of the pyrochlore structure, are proposed in the region of the fluorite phase.
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