Viscosity and liquidus-based predictor of glass-forming ability of oxide glasses

Autor(es)

Jiusti, Jeanini ^[1] ; Zanotto, Edgar D. ^[1] ; Cassar, Daniel R. ^[1] ; Andreeta, Marcello R. B. ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ Sao Carlos UFSCar, Ctr Res Technol & Educ Vitreous Mat CeRTEV, Grad Program Mat Sci & Engn, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the American Ceramic Society; v. 103, n. 2 SEP 2019.
• Citações Web of Science: 8

Resumo

Glass-forming ability (GFA) is a measure of the easiness to vitrify a given substance. Theoretically, it is possible to make a glass from any liquid provided it is quenched from its liquidus temperature with a cooling rate above a critical value R-c to avoid crystallization. However, measuring GFA is a laborious and time-consuming task. Moreover, predicting the GFA of substances that have never been vitrified is of greater interest. Here, we propose and evaluate a new parameter that can predict the glass forming ability of oxide mixtures. We derived a mother parameter, GFA = 1/R-c proportional to {[}U(T-max) x T-L](-1), where U(T-max) is the maximum crystal growth rate, and T-L is the liquidus temperature, which strongly correlates with the experimental critical cooling rates of oxide glass-formers. A simplified version derived from the mother parameter-which does not need (scarce) crystal growth rate data and only relies on viscosity eta and T-L, GFA proportional to {[}eta(T-L)/TL2]-also correlates well with the R-c of several oxide compositions. This new GFA parameter, dubbed Jezica, works when heterogeneous nucleation prevails. It corroborates the widespread concept that substances having high viscosity at T-L, and a low T-L can be easily vitrified, and provides a powerful tool for the quest and design of novel glasses. (AU)

• Processo FAPESP: 17/12491-0 - Processos cinéticos em vidros e novas formulações vítreas via aprendizagem de máquina
• Beneficiário: Daniel Roberto Cassar
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs