0.92,Co 0.08) 2As 2 superconducting material]]>

摘要

AbstractWe report the influences of the high hot isostatic pressure (HHIP) on Ba(Fe0.92,Co0.08)2As2superconducting bulks materials. Magnetic measurements showed that this material has a critical temperature (Tc) of 26?K. The HHIP process increases the density of flux pinning centers without altering the dominant flux pinning mechanisms and without decreasing ofTc. Structural studies have shown that the HHIP process increases the density of the material, reduces the size of voids, and thus allows to obtain homogeneous distribution of the components. Additionally, the HHIP process removes cracks in polycrystalline Ba(Fe0.92,Co0.08)2As2, creates more superconducting phase and forms less amount of Ba precipitates.Graphical abstractDisplay OmittedHighlights?Annealing without pressure leads to the formation of large voids and cracks.?Annealing without pressure creates large Ba precipitates with inhomogeneous distribution.?High isostatic pressure allows to obtain small Ba precipitations with homogeneous distribution and small voids.?High isostatic pressure eliminates cracks.?High isostatic pressure of 1.2?GPa does not changeTcand increaseJc.]]>