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Structure and nucleation mechanisms in oxide glasses: approach using nuclear magnetic resonance

Grant number: 12/24802-6
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): March 01, 2013
Effective date (End): April 29, 2015
Field of knowledge:Engineering - Materials and Metallurgical Engineering
Principal Investigator:Edgar Dutra Zanotto
Grantee:Jefferson Esquina Tsuchida
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
Associated scholarship(s):14/16446-0 - Structural characterization of borate glasses by high resolution Solid State NMR techniques, BE.EP.PD

Abstract

The nature of the devitrification process is a fundamental problem in glass science and governs their final stability. The aim of this project is the characterization of the molecular structures of various glasses - using various NMR techniques - and their possible correlation with the nucleation and crystallization mechanisms. In previous studies emerged the idea that there may be a relationship of the nucleation mechanism (surface - heterogeneous nucleation or volume - homogeneous nucleation) with the degree of similarity/difference between the molecular structure of a given glass and its respective isochemical crystal . We hypothesize that the facility of internal homogeneous nucleation observed in a few glasses is due to the topological similarity (chains, rings, clusters) between the structure of glass and its respective isochemical crystal. We will study several selected vitreous systems - borates, silicates and phosphates - by various NMR techniques and also some complementary methods (XPS, Raman, FTIR, XRD and thermal analysis) to get a clear picture about the glass structure, and thus obtain accurate information about the topological characteristics to investigate the validity of our hypothesis. That way we may significantly contribute to the understanding of the nucleation and crystallization mechanisms in glasses.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ESQUINA TSUCHIDA, JEFFERSON; APARECIDO FERRI, FABIO; SERGIO PIZANI, PAULO; MARTINS RODRIGUES, ANA CANDIDA; KUNDU, SWARUP; FABIAN SCHNEIDER, JOSE; DUTRA ZANOTTO, EDGAR. Ionic conductivity and mixed-ion effect in mixed alkali metaphosphate glasses. Physical Chemistry Chemical Physics, v. 19, n. 9, p. 6594-6600, MAR 7 2017. Web of Science Citations: 3.
ZANOTTO, E. D.; TSUCHIDA, J. E.; SCHNEIDER, J. F.; ECKERT, H. Thirty-year quest for structure-nucleation relationships in oxide glasses. INTERNATIONAL MATERIALS REVIEWS, v. 60, n. 7, p. 376-391, OCT 2015. Web of Science Citations: 23.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.