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


back to top

Activities and plans

Plan for 2018

TC26 ad TC03 will organize a joined meeting at PNCS-ESG in St Malo (July). The aim is to make a list of key fundamental of applied questions our technical committees could address in the future by making joined or separate actions.

In connection with TC03, we start the organization of two joined symposiums at the ICG meeting which will be held in Boston (USA) in 2019. The teasers of the symposiums are:

Structure of glass : Network Formers and Network Modifiers: The definition of glass forming ability is one of the first concept for which glass scientists tried to propose rules, essentially based on structural arguments. Since the first concept introduced by Zachariasen in 1932, and based on oxide glasses, the number of glass family increases a lot up to the chalcogenide, metallic, organic, spin glasses. How the Zachariasen concept of network formers, network modifiers, intermediate role, can survey in these others glasses systems? In this session, we encourage submission of abstracts whose purpose is to investigate the binding or depolymerizing role of the glass constituents, in order to motivate discussions between the scientific communities of oxide, chalcogenide, and metallic glasses.

Glass and Melt: Macroscopic Properties and Structure of Melt at High Temperature: The links between a glass and its liquid counterpart are complex but  fundamental for the development of new vitreous or crystalline materials. In this session, we encourage presentations on global studies between glass and liquid at high temperature, investigations that will relate the structural or macroscopic properties of the liquid to that of the glass.
 

 

 

 

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


Email TC26: Structure & Vibrations Using The Form Below.

:
:
:
:
Cancel

Latest ICG News

12/12/2018
A first for TC12
New publication by all the committee members
More >
12/12/2018
UG/PG grants 4 Boston
Support offered to attend next ICG congress
More >
Teaching glass better
10/09/2018
Teaching glass better
Celebrating Montpellier Summer Schools
More >
10/09/2018
10th ICG School
Anniversary celebrations include bioglasses
More >
25/05/2018
ICG president honored
2018 Samuel R Scholes Jr lecture given by Manoj Choudhary at Alfred
More >

Latest Other News

11/12/2018
Post-docs in Brazil
3 research positions in CeRTEV
More >
14/11/2018
Post doc position
University of Trento
More >
20/08/2018
AIGMF prizes
Somany and Balkrishna Gupta prize winners
More >
18/07/2018
Glass organisations
British Glass update website
More >
Committee Login