Accueil >
Production scientifique
Mécanismes d'endommagement des verres à l'échelle nanométrique
(11) Production(s) de l'année 2017
|
|
Bimodal distribution of Si-O-Si angles in sodo-silicate glasses 
Auteur(s): Hehlen B., Neuville D. R., Kilymis D., Ispas S.
(Article) Publié:
Journal Of Non-Crystalline Solids, vol. 469 p.39-44 (2017)
Ref HAL: hal-01624760_v1
DOI: 10.1016/j.jnoncrysol.2017.04.009
WoS: WOS:000405882900007
Exporter : BibTex | endNote
6 Citations
Résumé: Polarized Raman scattering is performed in a series of sodo-silicate glasses. The Si–O–Si inter-tetrahedral angle and its distribution are extracted using a model developed previously for densified silica, and the result are compared to ab initio atomistic calculations. The two techniques reveal a reduction of the most probable angle of about 0.30°/mol% of Na2O, but the shape of the angular distributions are different. The results suggest that Raman scattering enhances a specific angular distribution of Si–O–Si bridges, likely those close to sodium atoms, highlighting local angular heterogeneities.
|
|
|
|
Hard X-rays as pump and probe of atomic motion in oxide glasses
Auteur(s): Ruta Beatrice, Zotone F, Chushkin Y., Baldi G., Pintori G., Monaco G., Ruffle B., Kob W.
(Article) Publié:
Scientific Reports, vol. 7 p.3962 (2017)
Texte intégral en Openaccess : 
Ref HAL: hal-01548255_v1
DOI: 10.1038/s41598-017-04271-x
Exporter : BibTex | endNote
Résumé: Nowadays powerful X-ray sources like synchrotrons and free-electron lasers are considered as ultimate tools for probing microscopic properties in materials. However, the correct interpretation of such experiments requires a good understanding on how the beam affects the properties of the sample, knowledge that is currently lacking for intense X-rays. Here we use X-ray photon correlation spectroscopy to probe static and dynamic properties of oxide and metallic glasses. We find that although the structure does not depend on the flux, strong fluxes do induce a non-trivial microscopic motion in oxide glasses, whereas no such dependence is found for metallic glasses. These results show that high fluxes can alter dynamical properties in hard materials, an effect that needs to be considered in the analysis of X-ray data but which also gives novel possibilities to study materials properties since the beam can not only be used to probe the dynamics but also to pump it.
|
|
|
|
Complementarity between Optics and Neutron spectroscopy in the THz domain: An introduction
Auteur(s): Ruffle B.
Conférence invité: Workshop SON2017 (Grenoble, FR, 2017-06-19)
|
1 2
