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Synthesis and characterization of barium bis(citrato) oxozirconate(IV) tetrahydrate: A new molecular precursor for fine particle BaZrO3

Published online by Cambridge University Press:  03 March 2011

M. Rajendran  and
Subba M. Rao
M. Rajendran*
Affiliation:
Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
Subba M. Rao
Affiliation:
Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
*
a)Author to whom correspondence should be addressed. Presently at Materials Science Research Centre, Indian Institute of Technology, Madras 600 036, India.
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Abstract

Barium metazirconate (BaZrO3) fine powder has been produced by thermally decomposing a molecular precursor, barium bis(citrato)oxozirconate(IV) tetrahydrate at about 700 °C. The precursor, Ba[ZrO(C6H6O7)2] · 4H2O (BZO) has been synthesized and characterized by employing a combination of spectroscopic and thermoanalytical techniques. The precursor undergoes thermal decomposition in three major stages: (i) dehydration to give an anhydrous barium zirconyl citrate, (ii) decomposition of the anhydrous citrate in a multistep process to form an ionic oxycarbonate intermediate, Ba2Zr2O5CO3, and (iii) decomposition of the oxycarbonate to produce BaZrO3 fine powder. The particle size of the resultant BaZrO3 is about 0.2 μm, and the surface area is found to be 4.0 m2 g−1.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 9 , September 1994 , pp. 2277 - 2284
Copyright
Copyright © Materials Research Society 1994

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