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Structural and optical properties of epitaxial CaxBa1-xNb2O6 thin films grown on MgO by pulsed laser deposition

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6 Author(s)
Ndione, Paul F. ; INRS-EMT, Université du Québec, 1650 Boulevard Lionel Boulet, Varennes, Quebec J3X 1S2, Canada ; Gaidi, Mounir ; Durand, Christophe ; Chaker, M.
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In the present work, we investigate in detail the effect of both the deposition temperature and the cooling rate on the growth of calcium barium niobate (CBN) thin films on a magnesium oxide (MgO) single crystal substrate. As revealed by x-ray diffraction measurements, epitaxy occurs for films deposited at 800 °C with a slow in situ cooling rate. We have also investigated the chemical composition of the films by way of a Rutherford backscattering spectroscopy technique and of an elastic recoil detection analysis, which reveal a good stoichiometry for our samples. In addition, optical analysis (UV-visible spectroscopy and spectroscopic ellipsometry) is performed on both polycrystalline and epitaxial films. A high transmittance (≫85%) and a refractive index close to that observed for bulk crystal are obtained for epitaxial CBN films deposited at a low oxygen pressure. X-ray reflectivity measurements have enabled us to correlate the density of the films with their refractive indices.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 3 )

Date of Publication:

Feb 2008

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