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Gel-derived amorphous cesium-aluminosilicate powders useful for formation of pollucite glass-ceramics

Published online by Cambridge University Press:  31 January 2011

Mari A. Hogan  and
Subhash H. Risbud
Mari A. Hogan
Affiliation:
Department of Mechanical, Aeronautical, and Materials Engineering, University of California — Davis, Davis, California 95616-5294
Subhash H. Risbud
Affiliation:
Department of Mechanical, Aeronautical, and Materials Engineering, University of California — Davis, Davis, California 95616-5294
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Abstract

Amorphous powders in the Cs2O–Al2O3−SiO2 system were prepared by sol-gel processing. Gels made from TEOS, Al-chelate, and Cs-acetate were dried and calcined to obtain molecularly mixed powders of analyzed compositions in the range useful for conversion to pollucite (CsAlSi2O6) glass-ceramics. X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetry (TG), and scanning electron microscopy (SEM) were used to characterize the powders. A typical amorphous powder of analyzed chemical composition (in wt.%) = 28.05Cs2O, 37.77SiO2, and 37.96Al2O3 was found to have a glass transition temperature of 945 °C and a glass crystallization temperature of 1026 °C. Preliminary experimental results of densification and crystallization of the amorphous powders show pollucite/mullite phases to be present.

Type
Materials Communications
Information
Journal of Materials Research , Volume 6 , Issue 2 , February 1991 , pp. 217 - 219
Copyright
Copyright © Materials Research Society 1991

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