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Sol-gel synthesis of microcrystalline rare earth orthophosphates

Published online by Cambridge University Press:  31 January 2011

Yan Guo ,
Patricia Woznicki ,
Aaron Barkatt ,
Elie E. Saad  and
Inna G. Talmy
Yan Guo
Affiliation:
Department of Chemistry, The Catholic University of America, Washington DC 20064
Patricia Woznicki
Affiliation:
Department of Chemistry, The Catholic University of America, Washington DC 20064
Aaron Barkatt*
Affiliation:
Department of Chemistry, The Catholic University of America, Washington DC 20064
Elie E. Saad
Affiliation:
Miles Corporation, Baltimore, Maryland 21224
Inna G. Talmy
Affiliation:
Naval Surface Warfare Center, Silver Spring, Maryland 20910
*
b) The author to whom correspondence should be addressed.
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Abstract

Studies of the reactions between rare earth salts and phosphoric acid in aqueous or ethanolic media have shown that in both cases stable gels can be formed. Upon drying, gels prepared in aqueous environments yield macrocrystalline REPO4 products similar to those produced by conventional precipitation and drying. Gels prepared in ethanol, on the other hand, undergo dehydration to form dense microcrystalline products. This observation is based on optical and scanning electron microscopy, as well as on x-ray diffraction studies and infrared spectroscopy. These techniques, as well as differential thermal analysis, indicate that crystal growth of these products takes place around 600−700 °C. The composition of the dehydrated gels produced in both the aqueous and ethanolic systems corresponds to an orthophosphate structure. Other characteristics of the microcrystalline REPO4 products include high resistance to attack by water, absence of coloration upon exposure to gamma rays, and a high index of refraction.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 3 , March 1996 , pp. 639 - 649
Copyright
Copyright © Materials Research Society 1996

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