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Anomalous Phase Separation Behavior of Gel-Derived soda-silica Glasses

Published online by Cambridge University Press:  15 February 2011

George F. Neilson  and
Michael C. Weinberg
George F. Neilson
Affiliation:
Applied Mechanics Technology Section, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
Michael C. Weinberg
Affiliation:
Applied Mechanics Technology Section, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
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Abstract

The effects of retained bound hydroxyl groups on amorphous immiscibility behavior and on the kinetics of phase separation were studied in glasses containing from 10 to 19 percent sodium oxide prepared by the gel process. Differences in behavior as functions of preliminary thermal treatment of the gel precursor and of melting conditions were studied, employing IR spectroscopy, SAXS and WAXD to monitor the variation in glass microstructure. Both the initial gel treatment and the OH concentration in the prepared glasses were found to affect the immiscibility temperatures, and the magnitude of the maximum temperature increase was also a function of the sodium oxide concentration. It is suggested that the variation in thermodynamic behavior may be caused by the structural arrangement attained by the OH groups during the gel condensation process, which in turn affects the extent of hydrogen bonding to nonbridging oxygen ions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 9 , 1981 , 333
Copyright
Copyright © Materials Research Society 1982

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References

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