Polarized Raman spectroscopy of v-SiO2 under rare-gas compression
| Autor: | Mathieu Kint, Sébastien Clément, Alain Polian, René Vacher, Coralie Weigel, Benoit Ruffle, Bernard Hehlen, Marie Foret |
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| Přispěvatelé: | Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Rare gas
Materials science Isotropy 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Molecular physics Stiffening symbols.namesake Nuclear magnetic resonance Central force 0103 physical sciences Compressibility symbols [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] 010306 general physics 0210 nano-technology Raman spectroscopy Shrinkage |
| Zdroj: | Physical Review B: Condensed Matter and Materials Physics (1998-2015) Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2016, 93, pp.224303. ⟨10.1103/PhysRevB.93.224303⟩ Physical Review B Physical Review B, 2016, 93, pp.224303. ⟨10.1103/PhysRevB.93.224303⟩ |
| ISSN: | 1098-0121 1550-235X 2469-9950 2469-9969 |
| Popis: | International audience; High-pressure polarized Raman spectra of vitreous silica are measured up to 8 GPa in a diamond-anvil cell atroom temperature. The combined use of either a nonpenetrating pressurizing medium—argon—or a penetrating one—helium, allows one to separate density from stress effects on the Raman frequencies. In the framework of a simple central force model, the results emphasize the distinct role played by the shrinkage of the intertetrahedral angle Si-O-Si and the force-constant stiffening during the compression. The polarization analysis further reveals the existence of an additional isotropic component in the high-frequency wing of the boson peak. The pressure dependence of the genuine boson peak frequency is found to be much weaker than previously reported and even goes through a minimum around 2 GPa in remarkable coincidence with the anomalous compressibility maximum of silica. |
| Databáze: | OpenAIRE |
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