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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
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.

Type
Research Article
Copyright
Copyright © Materials Research Society 1992

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