Preparation and characterization of Ag-added Bi1.84Pb0.4Sr2Ca2.2Cu3O10+x
bulk tube conductors for cryogen free superconducting magnet |
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| Authors: | S N Ekbote G K Padam M Sharma N K Arora B S Khurana R C Goel D K Suri N Mehra B K Das |
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| Affiliation: | (1) Electronic Materials Division, National Physical Laboratory, 110 012 New Delhi, India;(2) University Scientific Instrumentation Centre, Delhi University, 110 007 Delhi, India;(3) C-MET, Panchawati, 411 008 Pune, India |
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| Abstract: | Bulk tube conductors of Bi
1.84
Pb
0.4
Sr
2
Ca
2.2
Cu
3
O
10+x
with addition of silver varying from 0 to 25 wt% (not reported earlier) were systematically studied using X-ray diffraction
(XRD), scanning electron microscopy (SEM), electrical transport and a.c. susceptibility techniques. The tube conductors formed
by cold isostatic pressing (CIP) of the powders obtained from spray drying method have been made successfully. It was found
that Ag addition has not only affected the formation of the desired Bi-2223 phase and the microstructure of these large bulk
tube samples thereby influencing on the critical current (
I
c
),it also reduces the contact resistance to minimize the cryogen losses. These variations have been found to be Ag content dependent.
An optimized value of 10 wt% Ag has been found to produce the best quality tubes showing reproducible
I
c
value > 120 Amp at 77 K which is in general a requirement to energies of the cryogen free conventional/HTSC superconducting
magnets below 20 K. |
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| Keywords: | Superconductivity Bi-2223 tube conductor spray drying cold isostatic pressing |
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