Title

Crystallization of La2O3-B2O3 Glasses Containing Al2O3 or Y2O3

Abstract

The crystallization kinetics of 25 La2O3 multiplied by (times) x Al2O3 multiplied by (times) (75 minus x) B2O3 and (25 minus x) La2O3 multiplied by (times) x Y2O3 multiplied by (times) 75 B2O3, mol% glasses with x equals 0 to 5 have been investigated using nonisothermal conditions. An earlier study showed that Al2O3 acts as a network former and Y2O3 as a modifier in these glasses. The effect of composition on the overall activation energy, E, and the frequency factor, +84,has been studied maintaining the glass former to modifier ratio at 3:1. E and nu decrease with increasing concentration of Al2O3, whereas these parameters first decrease, go through a minimum, then increase with increasing Y2O3. The effect of heating rate and annealing on the kinetic parameters is explained on the basis of a crystallization mechanism.

Meeting Name

XIV International Congress on Glass (1986: New Delhi, India)

Department(s)

Materials Science and Engineering

Keywords and Phrases

Alumina; Chemical Reactions - Reaction Kinetics; Glass Manufacture - Annealing; Heat Treatment - Annealing; Activation Energy; Frequency Factor; Heating Rate; Lanthanum Borate Glass; Modifiers; Network Formers; Glass

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1986 Indian Ceramic Society, All rights reserved.

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