Superconducting properties of the powder-in-tube Cu–Mg–B and Ag–Mg–B wires

The new class of Mg–B superconducting conductors was prepared using the standard in situ powder-in-tube method where Mg+2B mixture was used to fill the copper and silver tubes. Study of the intergranular current, grain connectivity and superconducting phases in wires were conducted by AC susceptibil...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2002-08, Vol.372, p.1254-1257
Main Authors: Glowacki, B.A, Majoros, M, Vickers, M.E, Zeimetz, B
Format: Article
Language:English
Subjects:
Critical current
Critical temperature anomaly
MgB 2 superconducting conductors
Processing
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Summary:The new class of Mg–B superconducting conductors was prepared using the standard in situ powder-in-tube method where Mg+2B mixture was used to fill the copper and silver tubes. Study of the intergranular current, grain connectivity and superconducting phases in wires were conducted by AC susceptibility measurements and direct four point transport measurements. Using SQUID magnetometer, magnetisation versus magnetic field ( M– H) curves of the round wires after reactive diffusion were measured at temperatures 5 K and magnetic field up to 5 T to define the J c mag . The direct current density measurements of the in situ Cu–MgB 2 performed at 4.2 K gave the value of 10 9 A/m 2.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(02)00986-3