TC03: Glass Structure


The activity of the TC03 committee is focused on the discussion of the basics aspects of glass structure as well as on the experimental collaboration throughout Round Robin tests of model glasses, for which atomistic simulation and thermodynamic modelling techniques are also used. The subject under study of TC03 is also extended to glass microstructure and the relationship between atomic structure and phase separation behaviour. Data on the structure of the Na2O-B2O3-SiO2 glasses under study have already been shared by four different laboratories. In order to investigate the mixing between the silicate and the borate species, advanced techniques such as the through space correlation scheme has been successfully applied. Furthermore, the results of thermodynamic calculations by using the model by N. Vedishcheva and coworkers agree quite well with the experimental data obtained by NMR characterisation. Structural characterisation of the four sodium borosilicate glasses will be completed not only through more advanced NMR methodologies but also with complementary techniques such as FTIR, Raman or XAFS spectroscopy. It has also been thought that Round Robin tests will be extended in a near future to other glass systems of common interest for the members of the committee.


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Activities

1st Meeting in 2016 in Shanghai during ICG: 
Present : Doris Moncke, Fran Munoz, Akira Takeda, Akira Saito, DRNeuville.
Discussion about future activities of the TC03: DRN showed a program of a possible school/workshop on the nature of the network former. A long discussion followed this presentation, and the program of the school workshop needed to be modified. 


2st Meeting in Sheffield 2016 during ESG: 
Present: Efstratios Kamitsos, Akira Takada, Natalia Vedishcheva, Ondrej Gedeon, Marek Liska, Doris Moncke, Alex Hannon, Jana Holubova, DRNeuville.
DRN presented a new version of the school/workshop program (see below). We discussed the possibility of organizing a school on the thermodynamics of glass and melts. After discussion, we decided to organize such a school before or after the DGG-USTV 2019 annual meeting in Erlangen. This school will be organized by Prof  D. de Ligny and Dr Natalia Vedishcheva. 

Plans for 2017
School/workshop: structural role of elements in glasses, from classical concepts to a reflexion over broad composition range Cargese, March 27-31, 2017. 
Present: Doris Moncke, Dominique de Ligny, Alex Hannon, Fran Munoz, Lionel Montagne, Neville Greaves (skype), Grant Henderson, DRNeuville. 

This school/workshop welcomed more than 70 people from Spain, England, Germany, Canada, Denmark, Italy, and France for a week. This week was shared in theoretical presentations that had been chosen by TC03-GDR-USTV and a round table discussion on the concept of network former for all glass families: oxides, chalcogenides, metals. A picture of the people present is below. 

Next TC03 Meeting in Oxford, UK July 26, 2017 during the borophosphate conference.

The ICG TC03 Technical Committee on “Glass Structure”
the “CNRS Glass-network on Glass (GDR-Verres)”,
 the “Union for Science and Glass Technology (USTV)”

March 27th-31st, 2017, Cargese, France

 

“STRUCTURAL ROLE OF ELEMENTS IN GLASSES, FROM CLASSICAL CONCEPTS TO A REFLEXION
OVER A BROAD COMPOSITION RANGE”

 

1. Presentation of the TC03 Technical Committee on “Glass Structure"

The ICG Technical Committees (http://www.icglass.org/technical_committees/) cover vital topics in glass science and technology. Meetings of the TCs are held regularly to discuss the results of inter-laboratory experiments and surveys.

The activity of TC03 is focused on a discussion of the basics aspects of glass structure as well as on the experimental collaboration throughout Round Robin tests of model glasses, for which atomistic simulation and thermodynamic modelling techniques are also used.

2. Presentation of the workshop

The definition of glass forming ability is one of the first concept for which glass scientists tried to propose rules, based on both thermodynamic and structural arguments. On the other hand, today’s glass technologists and scientists explore more and more unconventional compositions, and alternative elaboration methods enable glass preparation under ultra-soft (sol-gel) or extreme (sputtering, pressure) conditions. Today’s glass science also benefit from outstanding developments in analytical,  computational  and  structural  methods,  and  hence  they  either  confirmed  or  denied  the  classical  models  of network forming. All these elements indicate that there is room for a place to share and discuss the old and new concepts of glass formers and of course of their complementary modifiers.

This scientific subject is at the heart of the TC03 “Glass Structure” technical committee of the ICG, and it has been much discussed among its members. Nevertheless, an opportunity is now open to extend the discussion over a much broader audience. Indeed, 3 glass organizations decided to propose a workshop on the subject “structural role of elements in glasses, from classical concepts to a reflexion over broad composition range”. It will cover the general rules, some non-classical situations, a wide range of glass systems, and also the arguments brought by the most recent analytical and modelisation methods.

The workshop will be organized with general lectures presented by international experts, research presentations, and large time-space will be devoted to discussions and round-tables.

The public will be of course constituted by the TC03 members, and extended to all persons who would like to share their experience in the domain of the workshop. They will include glass technologists and industrials, who are already involved in the GDR-verres and USTV. In addition, the workshop will offer an unique experience for PhD students who want to get an advanced knowledge on non-conventional glass systems and their applications.

The GDR-Verres is a network held by the CNRS, which gathers all the French academic research groups (http://gdrverres.univ-lille1.fr). It is constituted of over 300 members and 60 research groups. Its aim is to organize scientific discussions on glass  science.  The  USTV  is  a  non-profit  association  (http://www.ustverre.fr).  It  aims  at  developing  and  disseminating knowledge  in  the  fields  of  glass  science,  glass  technology  and  glass  products.  The members  are  glass  manufacturers, industrials as well as academics.

3. Scientific and organizing committees

The scientific committee is constituted by the members of the TC3.  The organization committee is constituted by D. Neuville (Chair of TC03, President of USTV,), L. Montagne (vice-chair of TC03, Head of GDR-Verres, vice-president of USTV) L. Cormier (treasure of USTV, member of TC07), Alicia Duran (Vice-President of ICG), Annie Pradel (CNRS-Montpellier). Organizing secretary: F. Méar

 

4. Workshop Program:

The timetable with all the scheduled lectures is presented in the annex.

The main points that will be presented and the subjects of discussions are listed hereafter:

A: General rules

  • Classical rules on glass forming oxides (Zacchariasen, Dietzel, …)
  • Structural aspects (Bridging vs Non-Bridging oxygens, coordination, …)
  • Thermodynamic aspects (heat capacity, entropy, …)

B : Non-classical situations

  • How does glass forming depend on the glass composition? For instance, the role of lead or zinc may change according to their content in the glass
  • What about mixed-network formers? Do we have structural evidence, or is it observed only on electrical conductivity? Is there any competition for glass forming if several networks are mixed (aluminoborosilicates, phosphosilicates, glasses with only forming oxides, …) ?
  • Relations between forming effect and glass properties properties (Tg, DCp, viscosity…)
  • Vanadates, iron: what about the redox state and its effect on glass forming?
  • Invert glasses with a (very) low content of forming oxide (silicates, aluminates): is it a reality or a nonsense?
  • Amorphous compounds vs glass, is it related to glass forming ability? Non-conventional elaboration: can we induce a glass-forming character ? (e.g.: Al2O3 can be obtained as amorphous by sputtering)

C: Transposition in other glass-forming systems

  • Chalcogenides glasses
  • Metallic glasses
  • Organic glasses
  • Chloride, fluoride glasses
  • Nitride glasses
  • Hybrides glasses

D: Analytical and modeling aspects

  • Recent analytical developments that enable a better investigation of the glass forming effect : XR-abs/neutrons, NMR, Raman
  • Insights in glass forming effects from molecular dynamics and ab initio methods.

E : Round-tables

  • Is there an universal definition of glass formers?
  • Does the definition of glass formers depends on the type of glass-forming system?
  • Does the definition of glass formers evaluate with the development of better analytical tools?
  • Does modeling allow a different view of glass forming effect?

5. Practical Issues

  • Date : March 27-31st, 2017
  • Place : Cargese, France (Corsica)
  • The place is not fixed, we applied to the CNRS site in Cargèse, Corsica.
  • Number of participants : 80 (10 from TC3, 45 from GDR-Verres, 45 from USTV, among them about 15 PhD students).
  • The languages of the lectures will be English.
  • Registration will be free for academic participants and for students. Industrial participants will pay full registration fees.
  • Registration will be managed through the GDR-Verres website or through the CNRS Web application (web conference).

 

6. Summary

  • TC name and number and responsible TC chair

TC03 “Glass Structure and properties”, responsible Daniel NEUVILLE

 

  • The amount requested and a description of the activities proposed,

5 k€, for the organization of a 5 days workshop on “structural role of elements in glasses, from classical concepts to a reflexion over broad composition range”.

  •  breakdown of how the grant will be spent and an indication of the timeline for spending,

-50 k€

site renting, participants lodging and food,

+ 35k€ (approved)

GDR-Verres

+10k€ (requested)

Registration of industrials

+ 2k€

TC03 grant, covering the travel fees for international lecturers.

  • How the results of the activity will be disseminated, including deliverables to be reached
    • Information on the workshop granted by ICG within the international glass community (mailing lists, websites)
    • Workshop presentations will be available for participants through a website (downloading).
    • A summary paper with the main conclusions of the workshop will be submitted to an international Journal (JNCS or IJAGS).

Committee Members: back to top

Chromcikova, Maria
Dalba, Giuseppe (Prof.Dr)
Gedeon, Ondrej (Prof Dr)
Hannon, Alex (Dr)
Kamitsos, Efstratios (Prof)
Karpukhina, Natalia (Dr)
Liska, Marek
Moncke, Doris (Dr)
Montagne, Lionel (Prof Dr)
Munoz, Francisco (Dr)
Neuville, D. Committee Position: Chair
Saito, Akira (Dr)
Takada, Akira (Prof Dr)
Takebe, Hiromichi (Prof Dr)
Tricot, Gregory (Dr)
Vedishcheva, Natalia (Dr)
Wright, Adrian (Prof Dr)

Committee Contact Details: back to top

TC03: Glass Structure
Paris, France

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