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Sol-gel synthesis of phosphate ceramic composites I

Published online by Cambridge University Press:  31 January 2011

Burtrand I. Lee ,
William D. Samuels ,
Li-Qiong Wang  and
Gregory J. Exarhos
Burtrand I. Lee
Affiliation:
Department of Ceramic Engineering, Clemson University, Clemson, South Carolina 29634–0907
William D. Samuels
Affiliation:
Battelle Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352
Li-Qiong Wang
Affiliation:
Battelle Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352
Gregory J. Exarhos
Affiliation:
Battelle Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352
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Abstract

Monolithic gels of phosphate ceramics were synthesized using PO(OH)3−x(OR)x and alkoxides of silicon and titanium. The PO(OH)3−x(OR)x species were synthesized from the reaction of P2O5 and ethanol or n-butanol, and the products consisted of approximately equal molar amounts of mono- and dialkyl phosphate. The phosphate gels containing titanium lost less phosphorus than from the gels of silicon/phosphorus upon firing of gels in air. At phosphorus contents above 60 mole %, the gels were completely crystallized upon firing at temperatures above 700 °C, while the gels containing zinc and alkali metals remained amorphous after firing at 850 °C. Solid state nuclear magnetic resonance spectroscopy showed that all of the silicon is hexacoordinated in the phosphate gels containing silicon and titanium upon firing at temperatures above 520 °C

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 1 , January 1996 , pp. 134 - 143
Copyright
Copyright © Materials Research Society 1996

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References

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