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Elastic properties in different nano-structured AlN films

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Abstract

A study of the transverse acoustic phonons on nano-structured AlN films has been carried out by using high-resolution micro-Brillouin spectroscopy. Dense films have been deposited by radio frequency (r.f.) magnetron sputtering under ultra high vacuum at room temperature. Films with different morphologies were prepared and investigated by transmission electron microscopy and Brillouin Spectroscopy (equiaxed nano-sized, nano-columnar grains and amorphous phase). Results show a dependence of the transverse modes on the nano-structure. The nano-columnar film exhibits two transversal modes as expected for the AlN würtzite while the equiaxed nano-sized and the amorphous films only exhibit one isotropic transverse mode as expected in amorphous materials. One important result is that the sound propagation velocity in the AlN amorphous phase is higher than the one in the non-textured nano-crystalline phase. This phenomenon has, however, already been observed in ferroelectric ceramics.

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Authors and Affiliations

  1. Instituto de Ciencia de Materiales de Madrid (CSIC), Campus de Cantoblanco s/n, 28049, Madrid, Spain

    R. J. Jiménez Riobóo

  2. Institut Jean Lamour (UMR CNRS 7198), CNRS - Nancy-Université - UPV-Metz, Département CP2S, Boulevard des Aiguillettes, B.P. 239, 54506, Vandœuvre-lès-Nancy, France

    V. Brien & P. Pigeat

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  1. R. J. Jiménez Riobóo
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  3. P. Pigeat
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Correspondence to R. J. Jiménez Riobóo.

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Jiménez Riobóo, R.J., Brien, V. & Pigeat, P. Elastic properties in different nano-structured AlN films. J Mater Sci 45, 363–368 (2010). https://doi.org/10.1007/s10853-009-3944-3

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