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Sol-Gel Process from Heterobimetallic Alkoxides to Incorporate Lanthanides in an Alumina Matrix

Published online by Cambridge University Press:  25 February 2011

Chaitanya K. Narula
Chaitanya K. Narula*
Affiliation:
Chemistry Department, Research Laboratory, Ford Motor Company, P. O. Box 2053, MD 3083, Dearborn, MI 48121
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Abstract

Gels form on addition of seven or more moles of water diluted with i-PrOH to one mole of M[Al(O-i-Pr)4]3, M = La, Ce dissolved in i-PrOH. Thermal treatment of xerogels derived from La[AI(O-i-Pr)4]3 gives amorphous powders below 900°C. LaAIO3 crystallizes out at 900°C and residual alumina remains amorphous. CeO2 starts to separate out above 600°C from the xerogels prepared from Ce[M(O-i-Pr)4]3. Thermally induced structural changes in xerogels prepared from the mixtures of La[AI(O-i-Pr)4]3 and Ce[AI(0-i-Pr)4]3 in 1:1 or 1:3 ratio are different from those prepared from individual precursors. These xerogels remain amorphous below 700°C. Crystalline CeO2 forms on heating at 900°C but alumina remains amorphous. Sols are formed on hydrolysis of M[AI(0-/-Pr)4]3 in excess water and acidifying the reaction mixture with acetic acid. Sols can be converted to gels by slow evaporation of volatiles. This method is useful in preparing coatings.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 181
Copyright
Copyright © Materials Research Society 1992

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