Structural Studies on ZrO2-Y2O3 System by Electron Diffraction and Electron Microscopy I

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Abstract
The oxygen-ion arrangements in 10–50 mol% Y2O3-ZrO2 at high temperatures have been investigated by electron diffraction and high-resolution electron microscopy. The observed diffuse scattering patterns are sorted into three types: 10, 20–30 and 40–50 mol% Y2O3. The characteristic oxygen-ion displacements for 10 mol% Y2O3, are found to agree completely with the findings of Faber et al., and those for 40–50 mol% Y2O3, can be explained in terms of a random mixture of two structures δ=0 and δ=1. The oxygen-ion displacements in these structures are expressed by the transverse waves whose wavenumber vectors are q=(π/a 0)[11̄0] and q=(2π/a 0)[11̄0], respectively. The structure δ=1 occupies 8% and 3% in volume for 40 and 50 mol% Y2O3, respectively. The random mixture of these structures forms micro domains of several nm in diameter, but does not develop into an ordered state upon being treated with heat.

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