作者: R. J. Jiménez Riobóo , P. Pigeat , V. Brien
DOI: 10.1007/S10853-009-3944-3
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摘要: A study of the transverse acoustic phonons on nano-structured AlN films has been carried out by using high-resolution micro-Brillouin spectroscopy. Dense have deposited radio frequency (r.f.) magnetron sputtering under ultra high vacuum at room temperature. Films with different morphologies were prepared and investigated transmission electron microscopy Brillouin Spectroscopy (equiaxed nano-sized, nano-columnar grains amorphous phase). Results show a dependence modes nano-structure. The film exhibits two transversal as expected for wurtzite while equiaxed nano-sized only exhibit one isotropic mode in materials. One important result is that sound propagation velocity phase higher than non-textured nano-crystalline phase. This phenomenon has, however, already observed ferroelectric ceramics.