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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Non-stoichiometric crystallization of Li2SiO3-CaSiO3 glasses: Residual glass composition from ionic conductivity

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Autor(es):
Nuernberg, R. B. [1] ; Bello, T. S. [1] ; Fokin, V. M. [2] ; Zanotto, E. D. [1] ; Rodrigues, A. C. M. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Fed Sao Carlos, Dept Mat Engn, Vitreous Mat Lab, UFSCar, BR-13565905 Sao Carlos, SP - Brazil
[2] Vavilov State Opt Inst, Ul Babushkina 36-1, St Petersburg 193171 - Russia
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of Non-Crystalline Solids; v. 510, p. 158-165, APR 15 2019.
Citações Web of Science: 1
Resumo

All the properties of glass-ceramics are strongly dependent upon their nano or microstructure, including the percentage, composition and, structure of the residual glass phase. Unfortunately, however, determining the chemical composition of residual glass is far from trivial and there are very few publications on this matter. In this paper, we used electrical conductivity measurements by impedance spectroscopy to infer the composition of the residual glass in partially crystallized Li2SiO3-CaSiO3 glasses. The glass-ceramics were obtained by heattreatment at 560 degrees C for distinct periods, in conditions where only lithium-metasilicate (Li2SiO3) crystallized. Consequently, residual glasses of the resulting glass-ceramics became depleted in lithium, and their ionic conductivity and the respective activation energies changed accordingly. Therefore, we obtained the compositions of residual glasses by comparing the glass-ceramics ionic conductivities and activation energies with those of reference glasses having known chemical composition. We validated these two methods by comparing the obtained residual glass compositions with those obtained using a technique that relates the glass transition temperatures of reference glasses with those of glass-ceramics. These novel methods employing ionic conductivity and activation energy yield similar results to those obtained using the glass transition temperature method. However, the electrical property techniques are non-destructive and can be used to follow the crystallization process in situ. (AU)

Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
Beneficiário:Edgar Dutra Zanotto
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs