Title

Effect of VB and VIB Oxides on Nucleation Parameters in Lithium Disilicate Glass

Abstract

It has been proposed that some oxides act as nucleation agents in glass ceramics by reducing the interfacial tension between subcritical nuclei and the glass matrix. Evidence exists for classifying the Groups VB and VIB oxides in this type, which would support their behavior as homogeneous nucleation agents. However, substitution of MoO 3, Nb 2O 5, Ta 2O 5, and WO 3 for silica in lithium disilicate glass was shown to cause decreased steady-state nucleation rates and increased induction periods at 733 K, while substitution of V 2O 5 resulted in inconsequential changes. The effect of differential cooling rates through the glass cross section on crystal density following heat treatment was most apparent in those glasses containing the oxides that most retarded nucleation as a whole. The possible relationships between these effects and the effects of the substituted oxides on the physical properties of the glasses are analyzed; an especially significant link between viscosity and nucleation parameters is postulated. © 1989.

Department(s)

Materials Science and Engineering

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1989 Elsevier, All rights reserved.

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