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Sol–Gel Synthesis and Simultaneous Oxidation ofLn2Ba2Cu2Ti2O11−δ

✍ Scribed by M.R. Palacı́n; N. Casañ-Pastor; P. Gómez-Romero

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
839 KB
Volume
138
Category
Article
ISSN
0022-4596

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✦ Synopsis

The synthesis of several substituted and unsubstituted derivatives of the series of layered perovskites Ln2Ba2Cu2Ti2O11 by a sol-gel method is reported. Reduced synthesis temperatures were attained for La, Nd (750°C), and Eu (900°C) derivatives, whereas Tb derivatives could not be obtained by this method. The products were characterized by small particle sizes of 30-100 nm (compared to &800 nm for samples prepared by the classical ceramic method). Furthermore, in situ oxidation of the samples took place leading to oxidized products, such as La2Ba2Cu2.15 Ti2O11, which earlier could have been obtained only by high oxygen pressure (5 kbar) annealing.

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