A novel method for the synthesis of perovskite-type mixed metal oxides by the inverse microemulsion technique

Nanoparticles of lanthanum-nickel, lanthanum-copper and barium-lead oxalates with the metal molar ratios of 1:1, 2:1 and 1:1, respectively, were successfully synthesised in inverse microemulsions. These metal oxalate particles of about 20 nm diameter were readily calcined into single-phase perovskit...

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Bibliographic Details
Published in:Journal of materials science 1996, Vol.31 (4), p.1071-1079
Main Authors: GAN, L. M, ZHANG, L. H, CHAN, H. S. O, CHEW, C. H, LOO, B. H
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
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Summary:Nanoparticles of lanthanum-nickel, lanthanum-copper and barium-lead oxalates with the metal molar ratios of 1:1, 2:1 and 1:1, respectively, were successfully synthesised in inverse microemulsions. These metal oxalate particles of about 20 nm diameter were readily calcined into single-phase perovskite-type LaNiO3, La2CuO4 and BaPbO3. The calcination temperatures for these metal oxalates were generally 100-250 C lower than those for the metal oxalates prepared by the conventional aqueous solution precipitation method. The substantial reduction in the calcination temperatures is attributed to the formation of uniform, near-spherical nanoparticles of the metal oxalate precursors obtained by the unique inverse microemulsion technique. 26 refs.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00352909