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Characterization of the (Bi2−xSbx)Sr2CaCu2Oy system

✍ Scribed by W.J. Yu; Z.Q. Mao; L. Yang; C.Y. Xu; M.L. Tian; L. Shi; G.E. Zhou; Y. Zhang

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
274 KB
Volume
244
Category
Article
ISSN
0921-4534

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✦ Synopsis

Samples of nominal composition (Bi2_xSbx)Sr2CaCu2Oy (0.1 <x<0.3) are investigated. X-ray diffraction and electron diffraction show that the (Bi2_ xSbx) Sr2CaCu20~ system has a monoclinic phase with the lattice parameters a = 21.73/k, b = 5.76 • ~, c = 19.32 ,~ and/3 = 95.0 °, except for the tetragonal Bi-2212 phase. The results of energy dispersive X-ray spectroscopy reveal that Sb does not substitute for Bi in the Bi-2212 main structure, but forms the monoclinic phase of Bi4Sr4Ca2SbO~. The superconducting transition temperature, which is examined by electric resistance and AC magnetic susceptibility, is constant at about 87 K. The reason why Sb cannot substitute forBi in Bi202 layers has been discussed from the point of view of coordination.

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