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Contribution of Germanium Dioxide to the Thermal Expansion Characteristics of Some Borosilicate Glasses and Their Corresponding Glass-ceramics by H Darwish; Samia N Salama; S.M Salman is a Materials Science article available to read on EtoBox.

What is Contribution of Germanium Dioxide to the Thermal Expansion Characteristics of Some Borosilicate Glasses and Their Corresponding Glass-ceramics about?

The thermal expansion characteristics of some lithium aluminium germanium borosilicate glasses and their crystalline solids have been investigated. The base glass composition was modi®ed by partial replacement of germanium dioxide instead of silica. In some cases, however, TiO 2 was also added to some selected glasses as a nucleation catalyst. Slight increase in the thermal expansion coef®cient (a) values of the glasses and corresponding slight decrease in both transition (T g ) and softening (T s ) temperatures are detected by GeO 2 /SiO 2 replacements, however, the reverse results were recorded by TiO 2 addition. The obtained data were correlated to the local structure changes induced by GeO 2 or TiO 2 and their contributions to the thermal expansion property of the glasses. On the crystallization, the expansivity of the glasses was markedly changed. It was greatly affected by crystallization of GeO 2 -containing phases and aluminosilicate solid solutions together with the TiO 2 -containing phases formed. The results obtained were explained in relation to the nature, composition and concentration of all phases formed in the glass-ceramics including a residual glass matrix.

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Author

H Darwish; Samia N Salama; S.M Salman

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0040-6031)

Published

2001

Language

EN

Field

Materials Science (Physical Sciences)