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Cation Segregation in an Oxide Ceramic with Low Solubility: Yttrium Doped α-Alumina

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Interface Science

Abstract

The segregation behaviour of a cation (yttrium) with a low solubility in the polycrystalline oxide host (α-Al2O3) has been investigated at temperatures between 1450 and 1650°C using analytical scanning transmission electron microscopy. Three distinct segregation regimes were identified. In the first, the yttrium adsorbs to all grain boundaries with a high partitioning coefficient, and this can be modelled using a simple McLean-Langmuir type absorption isotherm. In the second, a noticeable deviation from this isotherm is observed and the grain boundary excess reaches a maximum of 9 Y-cat/nm2 and precipitates of a second phase (yttrium aluminate garnet, YAG) start to form. In the third regime, the grain boundary excess of the cation settles down to a value of 6–7 Y-cat/nm2 that is in equilibrium with the YAG precipitates. In a material (accidentally) co-doped with Zr, the Zr seems to behave in a similar way to the Y and the Y + Zr grain boundary excess behaves in the same way as the Y grain boundary excess in the pure Y-doped system. In this latter system, Y-stabilised cubic zirconia is precipitated in addition to YAG at higher Y + Zr concentrations.

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Authors and Affiliations

  1. Max Planck Institut für Metallforschung, Heisenbergstr. 3, 70569, Stuttgart, Germany

    M.A. Gülgün, R. Voytovych, I. Maclaren & M. Rühle

  2. Evans Hall (MC 1760), Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA

    R.M. Cannon

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  1. M.A. Gülgün
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  2. R. Voytovych
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  3. I. Maclaren
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  4. M. Rühle
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  5. R.M. Cannon
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Gülgün, M., Voytovych, R., Maclaren, I. et al. Cation Segregation in an Oxide Ceramic with Low Solubility: Yttrium Doped α-Alumina. Interface Science 10, 99–110 (2002). https://doi.org/10.1023/A:1015268232315

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