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Superconducting and crystallographic properties of Bi,Pb(2212)

✍ Scribed by A. Jeremie; J.-C. Grivel; R. Flükiger

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
329 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

Superconducting Bi2.xPbxSr2CaCu20 x (noted Bi,F~2212)) has been processed in air at 860°C with a nominal composition of Bi 1.72pbo.34srl.83Cao.97Cl12.13Ox in contrast to the literature where this phase was produced in argon around 740°C. With the aim of transforming this phase into Bi,F~b(2223) (another Bi-containing superconductor), Bi,PI~2212) has also been mixed with Ca,2CuO 3 and CuO. A critical temperature T~ of 95K was obtained for pure Bi,Pb(2212).

On the basis of DTA/TG and X-ray diffraction measurements, we can conclude that pure Bi,Pb(2212) melts at 882°C. If secondary phases are added, Pb leaves the Bi,Pb(2212) crystal structure around 400°C and it is again incorporated above 835°C until the phase melts at 876°C, a temperature somewhat lower due to compositional effects.

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The effects of Y and Pb co-doping on phase evolution, microstructure, electrical and superconducting properties of Bi-2212 have been studied. The results show that Y 3+ ions enter into the crystal structure by replacing Ca 2+ and/or Sr 2+ ions, and hence reduce hole concentration in the electronic s