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	home > research lines Long Term Research Lines: Crystal nucleation and growth in glasses Glass-ceramics development Thermomechanical and rheological properties of glasses Electrical behavior of glasses New glasses Ongoing International Research Projects: ADEMAT (Alfa EU II- Austria) - Advanced Engineering Materials Training Network International Quality Network (IQN) ICG (International Commission on Glass) IMI (International Materials Institute) Ongoing Research Projects: Current Issues on Glass Crystallization Controlled Crystallization of Glasses - Mechanisms, Kinetics & Applications Electrical Characterization of Glass and Ceramics Via Impedance Spectroscopy Project Summaries Controlled Crystallization of Glasses - Mechanisms, Kinetics & Applications Funding: Pronex / FINEP / CNPq Researchers (PIs): Vitreous Materials Laboratory - LaMaV / DEMa - UFSCar (Drs. E.D.Zanotto, O.Peitl Fº, V.R. Mastelaro, C. Fredericci) Laboratory of Solidification - LaSol / DEMa - UFSCar (Dr. C.S. Kiminami) Laboratory of Photonic Materials - LaMF / IQ - UNESP (Drs. Y. Messaddeq, S.J.L Ribeiro, N. Aranha) The main purpose of this project is to promote effective integration of three experienced research groups in: oxide glasses (LaMaV / UFSCar), fluoride and chalcogenide glasses (LaMF / IQ-UNESP) and metallic glasses (LaSol / UFSCar)- to carry out focused research, described bellow: i) To unmask fundamental aspects of the mechanisms and kinetics of crystallization of oxide, fluoride, chalcogenide and metallic glasses; ii) To develop materials having technological applications by controlled crystallization of glasses. Top Current Issues on Glass Crystallization Funding: FAPESP Researchers: Edgar D. Zanotto, Oscar Peitl Fº, Catia Fredericci, Eduardo Bellini Ferreira, Vladimir M. Fokin, Miguel O. Prado, Victor B. Brasil, Luciana A. Souza, Murilo Crovace and Paulo C. Soares Jr. Summary-objectives The general objective of this research is to study in detail and to contribute to the solution of several important problems regarding the mechanisms and kinetics of crystal nucleation and growth in glasses. Crystallization is the focused subject.  The main, specific, objectives of this project are: 1 - To study the competition between sintering and simultaneous crystallization of powdered glasses, from both theoretical and experimental points of view, and to define the conditions that favor each phenomenon; 2 - To examine the possible nucleation of metastable phases (MP) in the initial stages of crystallization in glasses. In case MP are found, to determine the favorable conditions and the important variables (thermal history, nucleants, etc.) that control this phenomenon; 3. To determine the possible dependence of the nucleus-liquid surface energy. Top Investigation of Mixed Former Effect in Ionic Conductor Glasses. Funding: FAPESP Researchers: Ana Cândida M. Rodrigues, Alvimar A. Campos, Gilberto Tadashi Niitsu. The mixed former effect is observed by an increase in ionic conductivity of some glass systems, when a second glass former is added to a binary (modifier-former) glass. Oxides systems such as lithium borosilicate and lithium silicotelurate are being studied in this research. Borosilicate glasses are reported to present the mixed former effect, although the complete series were not investigated yet. The melting of silicotelurates presents considerable difficulty due to volatilization of tellurium oxide and thus have not been conveniently studied so far. In this research, the electrical behavior of this late system is being systematically studied. Top International Research Projects ADEMAT (Alfa EU II- Austria) - Advanced Engineering Materials Training Network Begining: June, 2003 Institutions members: Universidad Tecnologica Nacional, Argentina Universidad Nacional de Rio Cuarto, Argentina USP UFSCar Universidad de Concepcion, Chile Universidad Central de Venezuela, Venezuela Universitat des Saarlandes, Germany Technische Universitat Freiberg, Germany Universidad de Alicante, Spain Universidade de Coimbra, Portugal Imperial College, UK Technische Universitat Wien, Austria Top International Quality Network (IQN) Begining: 1999 Site: http://www2.uni-jena.de/chemie/institute/glaschemie/IQN01.htm Institutions members: Universidade Federal São Carlos, São Carlos, Brazil,  Bulgarian Academy of Science, Sofia, Bulgaria,  University of Chemical Technology and Metallurgy, Sofia, Bulgaria University of Central Florida, Orlando, USA.  In particular, the following is enabled: Scholarships for advanced students, who would like to spend one or two semesters in Jena University, short-time scholarships for foreign Ph.D.-students, long-time scholarships for foreign students who would like to do a substantial part of their Ph.D.-thesis in Jena University and scholarships for foreign post-docs. Additionally two guest professorships for six months each are financed. The project is focused on materials science and materials chemistry. The topic of the cooperation between the participating institutions is "preparation and properties of glass-ceramics". Here, especially glass-ceramics with small crystallite sizes and a large volume content of crystallites are considered. This is of high scientific interest especially with respect to optical applications. This primarily should be achieved by the chemical composition of the glass. At the moment, oxyhalogenide glasses are favored. They also offer the advantage to enable light induced nucleation. Besides, rare earth elements may be incorporated in the crystal phase precipitated. This should enable the preparation of luminescence and laser materials Top ICG (International Commission on Glass) Glass crystallization and glass-ceramics commitee Beginning: 1985 Site: http://www.shef.ac.uk/uni/projects/icg/tc7.html Committee Members: Chair: Prof Dr. Wolfram Höland, Ivoclar, Liechtenstein  Vice-Chair Prof Dr Wolfgang Pannhorst, Germany  Members:  Dr. Ian Donald, AWE Aldermaston, Great Britain  Dr. V. Fokin, Academy of Science, St Petersburg, Russia  Prof. Dr. Klaus Heide, Germany  Prof. Peter James, Sheffield University, UK  Prof. Dr. Tadashi Kokubo, University of Kyoto, Japan  Dr. Ralf Müller, BAM, Berlin, Germany  Dr. Linda Pinckney, Corning Inc., USA  Prof. Dr. Jaroslav Sestak, Academy of Science, Prague, Czech Republic  Dr. I. Szabo, University of Veszprem, Hungary  Dr. Günter Völksch, University of Jena, Germany  Dr. Masamichi Wada, Nippon Electric Glass Co Ltd., Japan  Prof. Dr. Michael Weinberg, University of Arizona, USA (deceased) Prof. Dr. Edgar D Zanotto, Federal University of São Carlos Top
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