Effects of cold high pressure densification on Cu sheathed Ba0.6K0.4Fe2As2 superconducting wire

Fabrication of FeSe 0 . 5 Te 0 . 5 Superconducting Wires by an Ex Situ Powder-in-Tube Method

“…Moreover, the effect of the long-playing heat treatment for sample S 2 is more obvious than the high temperature for sample S 3 because the transport J c at 0.75 T of sample S 2 is higher than the one of sample S 3 . The sharp decrease of the transport J c from 0.5 to 0.75 T indicates a severe weak-link behavior in our FeSe 0.5 Te 0.5 wires, which may originate from the micro-scaled porosity and the impurities coating the grain boundaries discussed above [22,26]. Besides, the weak-link behavior was also observed in Sm-1111 and Ba-122 wires [22,24].…”

“…In addition, the porosity in micro-scale exists in both samples S 2 and S 3 . It has been proved that the micro-scaled porosity and the impurities coating the grain boundaries can lead to weak-link behavior [22,26].…”

“…Furthermore, further interest in fabrication of FeSe 1−x Te x wire has been excited since the value of transport critical current density (J c ) of the coated FeSe 0.5 Te 0.5 conductor was increased up to 1 MA/cm 2 in self-field and is much higher than that of Nb 3 Sn at high fields [18][19][20][21]. More importantly, it has been revealed that the core density of the superconducting wire is an essential factor to the transport J c [22][23][24][25][26][27][28]. Hence, the iron-based superconducting wires are usually prepared by the ex situ powder-in-tube (PIT) method since this method can avoid the pore arising from the chemical reaction and contribute to a relatively high core density [29].…”

Fabrication and Superconductivity of Ba0.6K0.4Fe2As2/Ag Wires and Tapes Using Mechanical Alloyed Precursor

“…Hence, a scalable and low-cost method is particularly desirable. Recently, a mechanical alloying method was developed to prepare the 122-type precursor [12]- [14]. A mixture of pure elements (A, K, Fe and As, A denotes alkali earth) is mechanical alloyed by high-energy ball milling.…”

Effect of metal (Zn/In/Pb) additions on the microstructures and superconducting properties of Sr1−xKxFe2As2 tapes

“…In order to exploit this material for applications, wires and tapes with high J c in-field are required. Attempts to accomplish this have invoked the introduction of numerous techniques including chemical addition [7][8][9][10], optimal heating conditions [10,11], various sheath materials [12][13][14] and mechanicaldeformation processing techniques [15][16][17][18]. Through years of efforts, significant progress has been made in powder-in-tube (PIT) processed 122-type conductors.…”