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Nano and micro crystallization in non-stoichiometric glasses

Grant number: 10/00553-1
Support type:Research Grants - Visiting Researcher Grant - International
Duration: January 01, 2011 - December 31, 2011
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator:Edgar Dutra Zanotto
Grantee:Edgar Dutra Zanotto
Visiting researcher: Vladimir Mikhailovich Fokin
Visiting researcher institution: International Science & Technology Center (ISTC), Russia
Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated research grant:07/08179-9 - Kinetic processes in glasses and glass ceramics, AP.TEM

Abstract

Significant advances in the fundamental understanding of crystallization processes has emerged in the last 4 decades from systematic experimental and theoretical studies of stoichiometric model glasses, i.e. in which the crystal phase has the same composition as the parent glass. This project is aimed at the experimental estimation of the nucleation and growth rates as a function of time and temperature and associated theoretical treatment of these data for two types of highly non-stoichiometric glasses: i) Photo-thermo-refractive (PTR) glass; a Na-Al-Zn-Br-F-silicate glass doped with Ce, Ag, Sb, and Sn and ii) glasses belonging to the meta-silicate section with compositions between 1Na2O*1CaO*2SiO2 (N1C1S2) and 2Na2O*1CaO*3SiO2 (N2C1S3), and a glass of composition 1Li2O*2CaO*3SiO2 for which there is no corresponding crystal phase, hence two or more phases should crystallize out on heating. (AU)