Optical and Acoustic Vibrations Confined in Anatase TiO<sub>2</sub> Nanoparticles under High-Pressure - Archive ouverte HAL Access content directly
Journal Articles Journal of Physical Chemistry C Year : 2014

Optical and Acoustic Vibrations Confined in Anatase TiO2 Nanoparticles under High-Pressure

Abstract

The effect of an applied high pressure on the optical and acoustic vibrations of small anatase TiO2 nanoparticles is studied using Raman scattering. All the Raman peaks show a significant variation of their frequency with pressure, except for the low-frequency peak which is due to acoustic vibrations confined in the nanoparticles. These variations (or lack thereof) are compared to first-principles calculations of the stiffness tensor and phonons of bulk anatase TiO2 as a function of pressure. In particular, the variation of the shape of the low-frequency peak is explained by the increase of the elastic anisotropy of anatase TiO2 as pressure is increased.
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hal-00991336 , version 1 (15-05-2014)

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Lucien Saviot, Denis Machon, L. Debbichi, Adrien Girard, Jeremie Margueritat, et al.. Optical and Acoustic Vibrations Confined in Anatase TiO2 Nanoparticles under High-Pressure. Journal of Physical Chemistry C, 2014, 118 (19), pp.10495. ⟨10.1021/jp502409e⟩. ⟨hal-00991336⟩
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