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Influence of the variation of the Hg and Pb stoichiometry on the microstructure andTcof HgxPbyBa2Ca2Cu3O8 + δ

✍ Scribed by I. Sargánkova; P. Diko; V. Kavečanský; J. Kováč; W. König; M. Mair; G. Gritzner; S. Longauer

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

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✦ Synopsis

Samples of Hg

x Pb y Ba 2 Ca 2 Cu 3 O 8+δ (1223) with x = 1.0, 1.2, 1.4 and y = 0, 0.1, 0.2, 0.3 were prepared by solid state method. The T c of undoped 1223 was about 111 K after synthesis. After annealing in oxygen the T c increased to 133 K. The T c for Pb-doped samples depended slightly on the Pb-content, for the as-prepared specimens were generally higher than for undoped specimens and additional annealing did not significantly change the T c s. Pb doping influences the shape of crystallites.

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