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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 lithium metasilicate-calcium metasilicate glasses. Part 2-Effect of the residual liquid

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Autor(es):
Fokin, Vladimir M. [1, 2] ; Reis, Raphael M. C. V. [2] ; Abyzov, Alexander S. [3] ; Chinaglia, Clever R. [2] ; Schmelzer, Juern W. P. [4] ; Zanotto, Edgar D. [2]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] SI Vavilov State Opt Inst, St Petersburg 193171 - Russia
[2] Univ Fed Sao Carlos, UFSCar, Vitreous Mat Lab, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil
[3] Kharkov Inst Phys & Technol, Natl Sci Ctr, UA-61108 Kharkov - Ukraine
[4] Univ Rostock, Inst Phys, D-18051 Rostock - Germany
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Journal of Non-Crystalline Solids; v. 379, p. 131-144, NOV 1 2013.
Citações Web of Science: 6
Resumo

Crystallization of non-stoichiometric glasses of the Li2O center dot SiO2-CaO center dot SiO2 joint (which has a simple eutectic) at deep undercooling proceeds in two stages. In the first stage, lithium metasilicate (IS) crystals are formed. In the second stage, after a considerable delay, it is supplemented by the evolution of a calcium metasilicate (CS) phase. The analysis of the evolution of the residual liquid composition and its effect on the crystallization process revealed a novel phenomenon. The formation of LS crystals in the first stage of the process leads to the establishment of a temporary equilibrium between the residual liquid and the LS-crystal phase. As a result, IS crystal growth is temporarily arrested. This termination of LS crystal growth occurs when the composition of the residual liquid reaches that of the metastable liquidus for LS at given temperature and pressure. The growth of LS crystals is resumed only in the second stage of the process when the CS crystals form. The evolution of the CS-crystal phase changes the composition of the residual liquid and shifts it away from the composition corresponding to the metastable liquidus. As the result, the LS crystals again become capable of further growth. The above crystallization pathway is expected to be a general phenomenon in phase formation in multi-component systems with different mobilities of the components determining the kinetics of formation of the different phases. (C) 2013 Elsevier B.V. All rights reserved. (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
Processo FAPESP: 12/17417-9 - Cinética de cristalização de vidros não estequiométricos
Beneficiário:Edgar Dutra Zanotto
Linha de fomento: Auxílio à Pesquisa - Pesquisador Visitante - Internacional