TC26: Structure & Vibrations


This TC focuses on the nature of the vibrations in glasses and on the structural information that can be gained using inelastic spectroscopy techniques: infrared absorption, light scattering, neutron and X-ray scattering, etc, as well as numerical simulations of the vibrational properties. We will mainly concentrate on:

a) the origin of the boson peak and its relation with the end of acoustic branches

b) the understanding of the optic modes of oxide glasses and their relation to the structure, and

c) the contribution of inelastic spectroscopies to the characterization of the structural properties of technological glasses


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Activities and plans

SUMMARY

This TC focuses on the nature of the vibrations in glasses and the structural information that can be gained using inelastic spectroscopy techniques: infrared absorption, light scattering, neutron and X-ray scattering etc, as well as numerical simulations of the vibrational properties. We will mainly concentrate on: i) the origin of the boson peak and its relation with the end of acoustic branches, ii) the understanding of the optic modes of oxide glasses and their relation to the structure, and iii) the contribution of inelastic spectroscopies to the characterization of the structural properties of technological glasses.

ACTIONS

2014 : Contribution to the book “Making Glass Better”

The conclusions of the expert meeting held in 2010 in Montpellier and gathering the members of TC26 have been summarized in the book “Making Glass Better 2”. The section concerning “vibrations and glass structure” has been organized as follows:

  1. Experts’ abstracts and main scientific interests. This part summarizes the main scientific contributions of the lecturers in the field over the last decades.
  2. Optic modes in oxide glasses. This part summarizes the discussion on the origin of the optic modes of glasses. experimental and simulation results during the last decades lead to a rather accurate description of the vibrations in simple oxide glasses, such as glass former or binary systems. Efforts should now be directed towards more complex systems, for example aluminosilicates, borosilicates, etc. and glasses with one or more alkali cations.
  3. Origin of the boson peak: the situation is here much more controversial. We extracted from the highly disputed discussion the progress which had the agreement of a large majority.

Finally, the section focused on expected breakthroughs in the field.

2015: Expert meeting on vibrations at PNCS conference in Niagara Falls, USA (22th septembre 2015)

List of invited lecturers (by order of appearance):
 
Bernard Hehlen , CNRS-University-Montpellier, France
Introduction
Optic Vibrations and Atomic structure of oxide glasses using Raman spectrosqcopy(ies)
Liping Huang, Rensselaer Polytechnic Institute-Troy, USA
In-Situ Brillouin and Raman light scattering study of glass under extreme conditions
Nikita S. Shcheblanov University of Missouri - Columbia, USA (absent, talk given by A. Tanguy)
The vibrational modes treatment and Raman analysis of vitreous silica upon mechanical loads
Benoit Rufflé, CNRS-Université Montpellier, France
From elastic properties to macroscopic physical properties of silicate glasses and melts
 Simona Ispas, CNRS-Université Montpellier, France
Raman spectra of silica and binary sodo-silicate glasses from first principle calculations
Anne Tanguy, CNRS-University Lyon 1, France
A numerical investigation of the effect of mechanical load on vibration modes, and their Raman signature in silica glasses
Silvia Caponi, Istituto Officina dei Materiali of CNR, Perugia, Italy
Brillouin and Raman spectroscopies: powerful tools for the investigation of structural and vibrational properties in glasses
John Kieffer, University of Michigan, USA
Glass formation and the absence of thermo rheological simplicity
 
The conclusions of the Symposium have been summarized in a press release on the ICG website. 
 
PLANS AND DELIVERABLES

Re-organisation of TC26

We plan to reorganise TC26 in order to match with the population that usually attends ICG conferences. The TC will centre its activity on the description of optic and acoustic vibrations in glasses giving direct information on structure. A call for new members will be made.

Committee Members: back to top

Bermejo, F.J.
Buchenau, UIi.
Chumako, A.
Cormier, Laurent
Dove, M.
Elliott, S.R. (Prof.)
Farnan, I.
Foret, M.
Hehlen, Bernard Committee Position: Chair
Henderson, G.
Horbach, Jurgen
Ispas, S.
Kamitsos, Efstratios (Prof)
Massiot, D.
Monaco, G.
Neuville, D.
Pasquarello, A.
Ramos, M.
Rufflé, Benoit
Schirmacher, W.
Schober, H.
Simon, P.

Committee Contact Details: back to top

TC26: Structure & Vibrations
Prof Bernard Hehlen
University of Montpellier
France


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