XAS investigation of Al2O3-coated nano-composite ZrO2

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Abstract

In order to complement the structural characterisation by high resolution electron microscopy and perturbed angular correlation spectroscopy (PAC) of Al2O3 coated nano-composite ZrO2, XAFS spectra have been acquired and analysed. The electron micrographs showed fringes of a well ordered lattice and well defined crystal faces of the as-produced powder whereas the PAC spectra indicated a strongly distorted short range order. On the basis of the XAFS data, a structural model for the ZrO2 core of the nano-composite ZrO2/Al2O3 with a well ordered Zr lattice and a sevenfold, strongly distorted nearest neighbour oxygen shell is proposed. A smooth temperature dependence without an indication for a phase transformation up to a temperature of 700K has been revealed.

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Hagelstein, M., Moser, H. O., Vollath, D., Ferrero, C., & Borowski, M. (2001). XAS investigation of Al2O3-coated nano-composite ZrO2. Journal of Synchrotron Radiation, 8(2), 522–524. https://doi.org/10.1107/S090904950001668X

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