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(165) Production(s) de RUFFLE B.
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Scaling the Temperature-Dependent Boson Peak of Vitreous Silica with the High-Frequency Bulk Modulus Derived from Brillouin Scattering Data 
Auteur(s): Ruffle B., Ayrinhac Simon, Courtens E., Vacher R., Foret M., Wischnewski A., Buchenau U.
(Article) Publié:
Physical Review Letters, vol. 104 p.067402 (2010)
Texte intégral en Openaccess : 
Ref HAL: hal-00512621_v1
PMID 20366853
DOI: 10.1103/PhysRevLett.104.067402
WoS: 000274445100047
Exporter : BibTex | endNote
46 Citations
Résumé: The position and strength of the boson peak in silica glass vary considerably with temperature T. Such variations cannot be explained solely with changes in the Debye energy. New Brillouin-scattering measurements are presented which allow determining the T dependence of unrelaxed acoustic velocities. Using a velocity based on the bulk modulus, scaling exponents are found which agree with the soft-potential model. The unrelaxed bulk modulus thus appears to be a good measure for the structural evolution of silica with T and to set the energy scale for the soft potentials.
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Indentation deformation mechanism in glass: Densification versus shear flow
Auteur(s): Rouxel T., Ji H., Guin J. P., Augereau F., Ruffle B.
(Article) Publié:
Journal Of Applied Physics, vol. 107 p.094903 (2010)
Ref HAL: hal-00497135_v1
Exporter : BibTex | endNote
Résumé: Although the characteristic time constant for viscous relaxation of glass is so large at room temperature that viscous flow would be hardly detectable, a permanent deformation can be easily achieved at ambient temperature by applying a sharp contact loading-a Vickers indenter for instance-for few seconds only. We provide direct evidence for densification and volume conservative shear flow by means of atomic force microscopy topological analysis of the indentation profile and volume on as-quenched and densified specimens (pressure up to 25 GPa). We show that both possible mechanisms contribute to different extents depending on the glass composition. A major finding is that densification predominates in glasses with relatively low atomic packing density but that shear flow relays on once densification is achieved. (c) 2010 American Institute of Physics. [doi:10.1063/1.3407559]
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Boson peak of Silica and its relation with elastic properties
Auteur(s): Ruffle B.
Conference: Workshop on Topology Structure and Dynamics in Non-Crystalline Solids (Paris, FR, 2009-09-20)
Résumé: Résumé (à fournir)
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Densification des verres silicatés étudiée par spectrométrie micro-Brillouin
Auteur(s): Ruffle B.
(Affiches/Poster)
Journée Verre 2009 (04/11/2009-06/11/2009) (Orléans, FR), 2009-11-04 |
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Mechanical relaxation at and below the glass transition
Auteur(s): Ruffle B. , Ayrinhac Simon, Foret M., Courtens E., Vacher R.
Conference: 8th Pacific Rim Conference on Ceramic and Glass Technology (Vancouver, CA, 2009-05-31)
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Mécanismes d’atténuation du son dans les verres
Auteur(s): Ruffle B., Foret M., Vacher R.
(Séminaires)
SAGEM (Paris, FR), 2009-07-16 |
