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Galina A Sychev, Speaker at Speaker for Catalysis Conference- Galina A Sychev
Russian Academy of Sciences, Russian Federation
Title : Spontaneous and catalyzed Crystal Nucleation in Glass of the Li2O SiO2 System

Abstract:

The results of studying the kinetics of spontaneous (homogeneous) and catalyzed (heterogeneous) crystal nucleation in silicate glass is presented for glasses in the Li2O–SiO2 system. Nucleation is catalyzed via the photosensitive mechanism by adding poorly soluble impurities, shifting the glass composition towards the higher content of one of the components (autocatalysis), and by passing steam through the glass melt. The fundamental characteristics of crystal nucleation are obtained. The composition ranges with the maximum and minimum steady-state crystal nucleation rates are identified. There has been keen interest in the fundamental problems of crystal nucleation and growth in glass due to the development of new glass ceramic materials. The fabrication of these materials is based on the controlled crystallization of glass with tailored compositions, which would be impossible without knowing the general regularities of crystal nucleation and growth in glass. A quantitative description of the experiment is a major challenge when studying the homogeneous and heterogeneous crystal nucleation and amorphization and crystallization processes in glass.  In this study, we investigated homogeneous crystal nucleation and the main methods for catalyzing the crystal nucleation for glass in the Li2O–SiO2 system.

Biography:

Dr. Sycheva studied the technology of glass and silicate materials at the Leningrad Institute of Technology, and received a master's degree in 1972. She joined the Laboratory of Physical Research of Glass at the Institute of Silicate Chemistry, Leningrad, USSR. She defended her PhD thesis in 1987 at the same institute. G. A. Sycheva devoted her entire scientific life to the study of the origin of crystals in glasses. Since 2015 she held the position of head of the Laboratory of the Structure and Properties of Glass (LSSS). She has published more than 100 scientific papers in scientific journals.

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