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Hyperfine Characterization of the Metastable t″-Form of the Tetragonal Phase in ZrO2–10 mol% Y2O3 Powders Synthesized by Gel Combustion

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A nanocrystalline ZrO2–10 mol% Y2O3 powder synthesized by a nitrate–citrate gel-combustion process and stabilized in the metastable t′′-form of the tetragonal phase has been characterized using mainly the Perturbed Angular Correlations technique. The determined hyperfine interaction allows a clear distinction between the zirconium surroundings in the t′′-form and those already known of the other forms of the tetragonal phase. Oxygen vacancies movement is revealed as a slow diffusion involving a very small activation energy. As the powder is heated, a transformation is observed to occur around 560°C, which is consistent with a t′′-to-cubic transition.
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Document Type: Research Article

Affiliations: 1: Departamento de Física, IFLP, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 1900 La Plata, Argentina 2: CINSO (Centro de Investigaciones en Sólidos), CITEFA-CONICET, 1603 Villa Martelli, Argentina

Publication date: 2005-06-01

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