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Properties of YBCO obtained by modified hydroxycarbonate method

โœ Scribed by L. Ciontea; T. Petrisor; V. Boffa

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
522 KB
Volume
21
Category
Article
ISSN
0749-6036

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โœฆ Synopsis

YBCO was synthesized by the co-precipitation of stoichiometric amounts of nitrate solutions of Y, Ba and Cu using a mixture of NaOH, Na 2 CO 3 and H 2 C 2 O 4 in a molar ratio of 5:1:1 as a precipitation agent. Even after prolonged thermal treatment at 950 โ€ข C the samples exhibit a zero-resistance critical temperature of about 87 K. This fact indicates a copper deficiency of about 0.1, more reduced than in the case of hydroxycarbonate co-precipitation. The as-synthesized samples have a high density, reaching 94% of the theoretical density. The SEM analyses show a large grain distribution from microns to tens of microns, favourable for good stacking.

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