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Cystal growth and electrical conductivity on LAGP glasses

Grant number: 12/24455-4
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): March 01, 2013
Effective date (End): February 28, 2015
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal researcher:Ana Candida Martins Rodrigues
Grantee:Artur Clarindo Pinto
Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil


Due to their high ionic conductivity, compounds with NASICON structure Li1+xAl1xTi2- xP3O12 (LATP) or Li1+xALxGe2-xP3O12 (LAGP), have been widely investigated since they are good candidates as solid electrolytes in lithium batteries. Besides the classic route of sintering, these compounds have also been obtained in the form of glass-ceramics. Initially, the interest in the glass-ceramic route was the possibility of obtaining a material with low porosity. Previous works in our research group demonstrated that the LAGP and LATP glasses present volume nucleation, opening the possibility to the microstructure control of these glass-ceramics and to the study of electrical conductivity-microstructure relationships. However, despite the great interest aroused by the glass-ceramic route, data concerning nucleation and crystal growth rates on these glasses are not yet available in the literature. So, the main purpose of this project will be the experimental measurement of the crystal growth rates in LAGP glasses. As a second objective, we will measure electrical conductivity in the samples used for measurements of growth rates, in order to investigate the behavior of the electrical conductivity of partially crystallized glasses, as a function of its crystallized volume fraction.(AU)

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