Nano and micro crystallization in non-stoichiometric glasses

• Grant number: 10/00553-1
• Support Opportunities: Research Grants - Visiting Researcher Grant - International
• Start date: January 01, 2011
• End date: December 31, 2011
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Edgar Dutra Zanotto
• Grantee: Edgar Dutra Zanotto
• Visiting researcher: Vladimir Mikhailovich Fokin
• Visiting researcher institution: International Science & Technology Center (ISTC), Russia
• Host 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)