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Low-temperature synthesis of ultrafine La0.84Sr0.16MnO3 powder by an autoignition process

Published online by Cambridge University Press:  03 March 2011

Amitava Chakraborty ,
P. Sujatha Devi ,
Sukumar Roy  and
H. S. Maiti
Amitava Chakraborty
Affiliation:
Electroceramics Laboratory, Central Glass & Ceramic Research Institute, Calcutta 700 032, India
P. Sujatha Devi
Affiliation:
Electroceramics Laboratory, Central Glass & Ceramic Research Institute, Calcutta 700 032, India
Sukumar Roy
Affiliation:
Electroceramics Laboratory, Central Glass & Ceramic Research Institute, Calcutta 700 032, India
H. S. Maiti
Affiliation:
Electroceramics Laboratory, Central Glass & Ceramic Research Institute, Calcutta 700 032, India
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Abstract

A simple and convenient method for low-temperature synthesis of La0.84Sr0.16MnO3 powder is described. The technique involves autoignition of a carboxylate (citrate + acetate)-nitrate gel resulting from a thermally induced anionie oxidation-reduction reaction to yield an ash, which upon calcination produces the desired powder. The resulting powder is pure, homogeneous, and possesses ultrafine particle size of the order of 0.3 to 0.5 μm. The autoignition is restricted to a particular range of carboxylate to nitrate ratio in the gel. Attempts have been made to understand the ignition process with the help of Thermogravimetry (TG) and Differential Thermal Analysis (DTA) of the samples. The process appears to have a higher degree of reproducibility and a good material yield (more than 96%) suitable for large-scale production.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 4 , April 1994 , pp. 986 - 991
Copyright
Copyright © Materials Research Society 1994

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References

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