Distinct correlation between CeO2 and YSZ in out-of-plane and in-plane mosaic dispersions of heteroepitaxial CeO2/YSZ/Si(001) films |
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Authors: | CH Chen A Saiki N Wakiya K Shinozaki N Mizutani |
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Institution: | (1) Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan, JP |
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Abstract: | The structural correlations including the lattice constants and the mosaic dispersions between CeO2 and yttria-stabilized ZrO2 (YSZ) in CeO2/YSZ/Si(001) heteroepitaxial films have been investigated by out-of-plane and in-plane X-ray-diffraction techniques. The distinct
linear correlations of the full width at half-maximum (FWHM) of the ω scan between CeO2 and YSZ have been found in both directions. CeO2 always has a 0.7° lower FWHM of the ω scan than YSZ in the out-of-plane direction, but has a 2.6° higher FWHM in the in-plane
direction. A possible relationship between the out-of-plane and in-plane FWHMs of the ω scans has been demonstrated with a
lattice-rotation model. Besides, the lattice constants of CeO2 are dependent on the FWHMs of the YSZ ω scans: as the FWHM is below 3.5°, CeO2 has a tetragonal distortion, and as the FWHM is higher than 3.5°, CeO2 exhibits a cubic structure without distortion. The results are of great interest, both for the fundamental understanding
of the film-growth mechanisms and for potential applications.
Received: 11 September 2000 / Accepted: 5 June 2001 / Published online: 30 August 2001 |
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Keywords: | PACS: 68 55 Jk 81 15 Fg |
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