Viscosity and Thermal Expansion of Alkali Germanate Glasses
- 1 October 1974
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 57 (10) , 436-439
- https://doi.org/10.1111/j.1151-2916.1974.tb11376.x
Abstract
Transformation‐range viscosities are reported for Na2O‐, K2O‐, Rb2O‐, and Cs2O‐GeO2 glasses. A minimum in viscosity occurs between 1 and 5 mol% alkali oxide and a maximum between 17 and 22 mol% alkali oxide. The thermal‐expansion coefficients of the Na2O‐GeO2 glasses also exhibit a minimum at < 5 mol% Na2O. The accepted structural model for alkali germanate glasses does not predict the minimum at low R2O concentrations. A modification of this model is suggested to explain these data.Keywords
This publication has 9 references indexed in Scilit:
- Influence of water on the rheological properties of alkali borate glassesJournal of Non-Crystalline Solids, 1972
- Effect of phase separation on the properties of simple glasses II. Elastic propertiesJournal of Non-Crystalline Solids, 1971
- Effect of phase separation on the properties of simple glasses I. Density and molar volumeJournal of Non-Crystalline Solids, 1969
- Infrared Absorption Spectra of Sodium Silicate Glasses from 4 to 30μJournal of the American Ceramic Society, 1964
- Studies in Germanium Oxide Systems: II, Phase Equilibria in the System Na2O—GeO2Journal of the American Ceramic Society, 1964
- Experimental Evaluation of Beam‐Bending Method of Determining Glass Viscosities in the Range 108 to 1015 PoisesJournal of the American Ceramic Society, 1963
- Thermal‐Expansion Properties of Vitreous and Crystalline GermaniaJournal of the American Ceramic Society, 1962
- Density and Expansivity of Vitreous GermaniaJournal of the American Ceramic Society, 1959
- Germanium. XVIIThe Journal of Physical Chemistry, 1926