Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes.

ABSTRACT: High-performance Sr0.6K0.4Fe2As2 (Sr-122) tapes have been successfully fabricated using hot pressing (HP) process. The effect of HP temperatures (850-925°C) on the c-axis texture, resistivity, Vickers micro-hardness, microstructure and critical current properties has been systematically studied. Taking advantage of high degree of c-axis texture, well grain connectivity and large concentration of strong-pinning defects, we are able to obtain an excellent Jc of 1.2 × 10(5)?A/cm(2) at 4.2?K and 10?T for Sr-122 tapes. More importantly, the field dependence of Jc turns out to be very weak, such that in 14?T the Jc still remains ~ 1.0 × 10(5)?A/cm(2). These Jc values are the highest ever reported so far for iron-pnictide wires and tapes, achieving the level desired for practical applications. Our results clearly strengthen the position of iron-pnictide conductors as a competitor to the conventional and MgB2 superconductors for high field applications.

SUBMITTER: Lin H 

PROVIDER: S-EPMC4221786 | biostudies-other | 2014

REPOSITORIES: biostudies-other