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Structural relaxation kinetics at temperatures below the glass transition temperature

Grant number: 18/25490-4
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): February 01, 2019
Effective date (End): July 31, 2019
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Edgar Dutra Zanotto
Grantee:Rodrigo Cardoso dos Passos
Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated research grant:13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass, AP.CEPID

Abstract

The relaxation phenomenon is intrinsic to all vitreous material, although it is underexplored at temperatures well below the glass transition temperature (Tg). This projects proposal is the in-depth study of the structural relaxation of a dropsied glass (CaO.MgO.2SiO2) at temperatures close and below Tg. The structural relaxation will be quantified from index refraction measurements after different isothermal heat treatments. We aim to connect the relaxation kinetics with the viscous flow of this material. Also, with previously obtained crystallization data for the diopside glass, we will lo of for a solution to the Kauzmann paradox, which says that there is a temperature (higher than 0 K) where the entropy of a supercoiled liquid is the same that of a crystal.