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RESEARCH PRODUCT
Optical and Acoustic Vibrations Confined in Anatase TiO2 Nanoparticles under High-Pressure
Lucien SaviotL. DebbichiAlain MermetDenis MachonJérémie MargueritatM.c. Marco De LucasPeter KrügerPeter KrügerA. Girardsubject
AnataseMaterials scienceCondensed matter physicsPhononbusiness.industry[ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]Physics::OpticsNanoparticleSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsVibrationsymbols.namesakeCondensed Matter::Materials ScienceGeneral EnergyOpticsHigh pressurePhysics::Atomic and Molecular Clusterssymbols[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]Physical and Theoretical ChemistrybusinessRaman spectroscopyRaman scatteringStiffness matrixdescription
International audience; 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-04-21 |