The strategy of TC07 is based on the following topics: -new properties and new applications of multi-component glass-ceramics; -fundamental studies of the kinetics mechanisms of nucleation and overall crystallization (e.g. surface versus internal crystallization).
To understand from both theoretical and experimental points of view the fundamental aspects that govern crystal nucleation and growth in glasses; and to foster collaboration between academic, governmental, and industrial researchers to develop, characterize, and optimize existing and novel glass-ceramics and their processing with focus on multi-component systems.
TC07 members were engaged at ICG Boston as session organizers and gave invited talks. TC07 organized session I-8 (M. Davis, R. Müller; Invited talks: T. Komatsu, I. Mitra), E. D. Zanotto co-organized session II-2 (Invited talk: J. Deubener), J. Deubener organized session IV-1, and R. Hill symposium VI. The session Arun K. Varshneya Festschrift was supported by W. Höland, and E. D. Zanotto with invited talks.
During the business meeting at ICG Boston, TC07 members intensively discussed how to better interlock the strong and diverse activities of its academic and industry members. Following previous informal questionnaires, short presentations were given, and promising strategies were discussed. Inspired by the positive response to the above-mentioned joint publication, TC07 members decided to define a round-robin glass for testing of key metric(s) for crystallization studies as the next step to go. Leveraging the industrial-scale melting laboratories available to some members of TC07 could yield kg-scale melts of desired compositions, sufficient to provide all interested researchers with enough material for multiple tests on the exact same glass.
In 2019, TC07 members continued their manifold activities in teaching, cooperative research and organizing conferences. J. Deubener taught at the 11th Montpellier Summer School organized by TC23 and M. J. Pascual Francisco participated as teacher in the First North American Summer School on Photonic Materials (NASSPM) organized by TC20. W. Höland and M. Rampf submitted a book chapter “Glass-ceramics for dental restorations” to be included in: K. Pawelec (ed.), “Bone repair biomaterials: Regeneration and clinical aspects” (2nd ed.). Together with G.H. Beall, W. Höland launched the 3rd edition (!) of the textbook: Glass-ceramic technology. W. Höland also gave an invited talk at Bio-4, Toronto, Canada, July 2019 (Symposium Delbert Day).
TC07 members were engaged in organizing conferences unfortunately cancelled due to the COVID-19 crisis. L. Cormier organized the symposium “Crystallization2020” (https://crystallization.sciencesconf.org/ ) and J. Deubener, I. Mitra, and L. Cormier, organized a session at DGG-USTV 2020 in Orleans (https://ustv-dgg-2020. sciencesconf.org). Last, but not least, based on their continuous cooperation, TC07 members published 5 joint papers on crystallizing bio glasses (with TC04), sodium ion conductive glasses, hydrogen diffusivity in aluminosilicate glasses, hydrous soda-lime-silica and silicoborate glasses.
Shifeng Zhou (first left) and Robert Hill (second right) were honoured with the “2018 V. Gottardi Prize” and the “Varshneya Glass Technology Lecture”, respectively, at ICG Boston. (Photographed at the joint TC07 dinner celebrating the best TC web page prize 2018)
The joint TC07 paper “Updated definition of glass-ceramics” was honoured by the Journal of Non-Crystalline Solids with “The 2018 Most downloaded article Award”.
Definition of glass-ceramics updated
Glass-ceramics are noted for their unusual combination of properties and manifold commercialized products for consumer and specialized markets. Evolution of novel glass and ceramic processing routes, a plethora of new compositions, and unique exotic nano- and microstructures over the past 60 years led us to review the definition of glass-ceramics. Well-established and emerging processing methods, such as co-firing, additive manufacturing, and laser patterning are analyzed concerning the core requirements of processing glass-ceramics and the performance of the final products. In this communication, we propose a revised, updated definition of glass-ceramics, which reads
“Glass-ceramics are inorganic, non-metallic materials prepared by controlled crystallization of glasses via different processing methods. They contain at least one type of functional crystalline phase and a residual glass. The volume fraction crystallized may vary from ppm to almost 100%”.
Schematic description of the conversion of a glass into a glass-ceramic. The critical cooling rate is qc = (TL – TN) / δt with TL = liquidus temperature, and TN = “nose temperature” (= temperature at which the time δt to achieve a crystal fraction of 10−6 is shortest). Glass formation by melt-quenching takes place for q ≥ qc. “Uncontrolled” spontaneous crystallization occurs for q < qc. The glass-ceramic A is obtained during cooling, whereas glass-ceramics B and C are converted by single and double-stage heat-treatments, respectively.
Get the full article here.
TC07 members lectured on “Controlled crystallization of glasses – from transformation kinetics to glass-ceramics” at the 10th ICG Summer School in Montpellier.
Main ideas of the course were included in the book “Teaching glass better” published by ICG in 2018. The chapter on crystallization and GCs aims in sketching the theory of nucleation and crystal growth and sheds light on the variety of experimental methods to determine kinetically relevant parameters. Classical techniques to measure nucleation and growth rates using double-stage heat treatments and image analysis are introduced and flanked by advanced calorimetric methods and high temperature X-ray diffractometry. The requirements of a controlled crystallization process for glass-ceramics manufacturing are the prime focus of the chapter and the common strategy in industry of splitting the nucleation and functionality tasks between two or more phases is highlighted for two types of glass-ceramic products.
From the chapter
“Tammann rate curves are the representation of the temperature dependence of the steady state nucleation rate I0 and the size independent growth rate U0 in a common diagram. Besides homogeneous nucleation (HOM), a nucleation rate curve for each type of external active site has to be considered (HET1, HET2, etc.). Depending on the chemical system under consideration U0 and I0 curves are more or less overlapping. The liquid-to-crystal transformation proceeds steadily in the temperature range of the overlap of both rate curves.”
12th International Symposium on Crystallization in Glasses and Liquids (2017)
The 12th International Symposium on Crystallization in Glasses and Liquids (Crystallization 2017) was celebrated in the historic city of Segovia, Spain. The conference chairs were M.J. Pascual and A. Durán. The home page of the event is still available here. The conference venue was the Auditorium in the Parador de Segovia. The Spanish Society of Ceramics and Glass (SECV) had the pleasure and honour to host this conference, which is the twelfth in a series. Previous versions have been held in
Nagaoka, Japan 2015 (T. Komatsu, A. Sakamoto)
Goslar, Germany 2012 (J. Deubener)
Iguaçu Falls, Brazil 2009 (E.D. Zanotto)
Jackson Hole, Wyoming U.S.A. 2006 (M.J. Davis)
Sheffield, England 2003 (P.F. James)
Vaduz, Liechtenstein 2000 (W. Höland)
Florianopólis, Brazil 1996 (E.D. Zanotto)
Over the years, these bi- or triennial meetings have established a strong international reputation for disseminating the state-of-the-art in crystallization research, from fundamental aspects to innovative glass-ceramic products. The Segovia meeting covered the areas of simulation and theory, formation, structure, properties, and applications of crystallized glasses presented in 57 lectures (including 11 invited talks) and 76 posters. In particular, participants from nineteen different countries found excellent opportunities for facilitating discussion on:
Fundamental approaches to nucleation and crystal growth (the interplay of theory, modelling and experiment)
Experimental studies (compositional and structural influences)
Advanced methods, techniques and characterization tools (in-situ, real time)
Role of nucleation agents (halogens, rare-earth and transition-metal oxides, noble metals)
Properties of glass-ceramics (thermal, mechanical, electrical, optical, chemical)
Microstructure/property relationships in glass-ceramics (strength, transparency, chemical resistance)
Novel processing techniques (laser sintering, sol-gel, field-induced nucleation…)
Commercial and new glass-ceramic applications (appliances, armour, bio-medical, dental, optical, seals)
Crystallization phenomena in related materials (metallic glasses, polymer glasses, natural glasses)
The invited paper were given by:
C. Rüssel, Otto Schott Institute, Jena University (Germany)
J.W. P. Schmelzer, Rostock University (Germany)
A.S. Abyzov, NSC Kharkov Institute of Physics and Technology (Ukraine)
W. Höland, Ivoclar Vivadent AG (Liechtenstein)
Q. Jianrong, Zhejiang University (China)
H. Jain, Lehigh University (USA)
F. Serbena, UEPG (Brazil)
C. Siligardi, DIEF, University of Modena and Reggio Emilia (Italy)
T. Honma, Nagaoka University of Technology (Japan)
M. Allix, CEMHTI laboratory (France)
A. de Pablos-Martín, IMWS, Halle (Germany)
Two oral presentations and four posters presentations were awarded with a certificate and a gift (100 €) to presenters below 40 years old. The oral awards went to Susanne Krüger from Clausthal University (Germany) for her presentation “How to take into account the stochastic nature of nucleation in constructing a time-temperature-transformation diagram?” and Mariona Tarragó from Barcelona University (Spain) for her presentation “Simulation of vitrification of sewage sludge using a Ca-doped basalt”. The four posters awards went to Mikiya Kotava (Japan), Carsten Blaess (Germany), Tina Waurischk (Germany) and Laura Briese (Germany).
Awardees S. Krüger (centre-left) and M. Tarragó (centre-right) with the conference chairs M.J. Pascual (right) and A. Durán (left)
The excursion led through the Royal Glass Factory of La Granja National Centre of Glass and La Granja Gardens.
The Symposium was supported by:
Fundación Centro Nacional del Vidrio (FCNV, La Granja)
Erich Netzsch GmbH & Co. Holding KG
Segovia Convention Bureau
Topical issues edited by TC07
TC07 aims in publishing jointly research activities in electronic and print media. The list shows finalized special issues on crystallization and GCs (guest editors are indicated in brackets).
Journal of Non-Crystalline Solids, Volume 501, 2018 (M.J Pascual, A Durán)
“Nucleation and Crystallization of Glasses and Glass-Ceramics” Frontiers Media SA, 2017 (W. Höland, J. Deubener)
MRS Bulletin, Volume 42, Issue 3, 2017 (M.J. Davis, E.D. Zanotto)
Journal of Non-Crystalline Solids, Volume 384, 2014 (J. Deubener)
Journal of Non-Crystalline Solids, Volume 356, Issues 52-54, 2010 (V.R. Mastelaro, M.J. Davis, E.D. Zanotto)
Am. Ceram. Soc., CD-ROM 2009, ISBN 978-0-470-09732-8 (M.J. Davis)
Phys. Chem. Glasses 45, 2004 and Glass Technol. 45, 2004 (P.F. James)
Glastech. Ber. Glass Sci. Technol. 73 C1, 2000 (W. Höland)
Journal of Non-Crystalline Solids, Volume 219, 1997 (E.D. Zanotto)
From left to right: Wolfram Höland, María Jesús Pascual, Signo Nakane, Joachim Deubener, Tsuyoshi Honma, Edgar Zanotto, Mark Davis, Ina Mitra, Shifeng Zhou, Ralf Müller, Takayuki Komatsu, Philippe Pradeau and Markus Rampf (Foto taken at the Parador de Segovia, 2017).
Davis, Mark Committee Position: Chair
Holand, Wolfram Committee Position: Vice Chair
Müller, Ralf Committee Position: Vice Chair
Committee Contact Details
TC07: Crystallisation & GCs
Schott North America