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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.)

Crystallization mechanism and kinetics of a Fe-diopside (25CaO center dot 25MgO center dot 50SiO(2)) glass-ceramic

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Autor(es):
Mastelaro, Valmor R. [1] ; Bayer, Paulo S. [1, 2] ; Zanotto, Edgar D. [3]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13560970 Sao Carlos, SP - Brazil
[2] Fed Inst Santa Catarina, Campus Joinville, BR-89220618 Joinville, SC - Brazil
[3] Univ Fed Sao Carlos, CeRTEV, DEMa, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Journal of Materials Science; v. 54, n. 13, p. 9313-9320, JUL 2019.
Citações Web of Science: 2
Resumo

Diopside-based ceramics and glass-ceramics have been studied because of their applications in electronics and biomedicine. However, since diopside glass presents poor internal nucleation ability, sintering combined with surface crystallization of powdered glasses has been reported to obtain diopside glass-ceramics. On the other hand, in this work, we explore the effect of an efficient nucleating agent (Fe2O3) to induce copious internal nucleation in this glass, which enabled the production of single-phase diopside glass-ceramics by the traditional route. The crystallization kinetics of a diopside glass (25CaO25MgO50SiO(2)) containing 8.26mol% of Fe2O3 was investigated under isothermal conditions by differential thermal analysis (DTA) and was modeled by the Johnson-Mehl-Avrami-Kolmogorov-Erofeev (JMAKE) equation. The crystals formed were iron-diopsidethe X-ray diffraction pattern was indexed to the ferric-diopside card (Ca-0.991(Mg0.641Fe0.342)(Si1.6Fe0.417)O-6). Through a systematic DTA study, we successfully determined the mechanism and kinetics of crystallization of this material, which provided relevant information to guide the development of this novel type of internally crystallized glass-ceramic. (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