Title

Crystallization of Baria-Titania-Silica Glasses

Abstract

The critical cooling rate for glass formation, Rc, and the crystallization kinetics of the compositions 1 2(100 - x)BaO- 1 2(100 - x)TiO2-xSiO2 with x = 20, 25, 30, 33.3 and 40 mol.% were studied using a thermal image furnace. Crystallization was studied under nonisothermal conditions and the data were analyzed using the Johnson-Mehl-Avrami (JMA) equation. The Rc and activation energy for crystallization both decrease with increasing silica content. Fresnoite, Ba2TiSi2O8, crystallized from all of the glasses when they were reheated. The infrared absorption spectra of the glasses and crystals show that they both contain (Si2O7) and square pyramidal (TiO5) groups.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Oxides - Amorphous; Baria-titania-silica Glasses; Johnson-mehl-avrami Equation; Glass, Metallic

International Standard Serial Number (ISSN)

223093

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1986 Elsevier, All rights reserved.

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