Study of local structure around zirconium ions in grain boundaries of polycrystalline α-alumina by X-ray absorption spectroscopy and chemical analysis of thin foils - Sorbonne Université Access content directly
Journal Articles Journal of the European Ceramic Society Year : 1999

Study of local structure around zirconium ions in grain boundaries of polycrystalline α-alumina by X-ray absorption spectroscopy and chemical analysis of thin foils

Abstract

The chemical state and local structure around zirconium ions in doped α-polycrystalline alumina (300 wt ppm ZrO2) was studied by X-ray absorption spectroscopy measurements at the zirconium K edge and by scanning transmission electron microscopy on thin foils. The zirconium segregation in alumina grain boundaries depends on alumina grain size: for a mean grain size of about ∼3·5 μm, the grain boundaries are saturated with zirconium. The zirconium grain boundaries to bulk concentration ratio, calculated from energy dispersive X-ray spectrometry measurement on thin foils is equal to ∼(5±3)×103. The zirconium located in grain boundaries forms nanocrystalline tetragonal zirconia particles. This allotropic zirconia form is stabilised at room temperature because of the important contribution of the surface free energy.

Dates and versions

hal-04313878 , version 1 (29-11-2023)

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M.K. Loudjani, Robert Cortés. Study of local structure around zirconium ions in grain boundaries of polycrystalline α-alumina by X-ray absorption spectroscopy and chemical analysis of thin foils. Journal of the European Ceramic Society, 1999, 19 (15), pp.2659-2666. ⟨10.1016/S0955-2219(99)00046-1⟩. ⟨hal-04313878⟩
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