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We have fabricated (Ba,K)Fe2As2 superconducting wires through ex-situpowder-in-tube method. Silver was used as a chemical addition to improve theperformance of these superconducting wires. The transport critical currentdensities (Jc) have reached 1.3\times104 A/cm and 1.0\times104 A/cm2 at 4.2 Kunder self field in the wires with and without Ag addition. We usedmagneto-optical (MO) imaging technique to investigate the properties of grainboundaries in the (Ba,K)Fe2As2 superconducting wire with Ag addition. MO imagesshow the weak links in the Fe-based superconducting wires for the first time.An intragranular Jc of 6.0\times104 A/cm2 at 20 K is obtained from MO image,which is consistent with the estimation from M-H measurement.

Superconducting properties and magneto-optical imaging of Ba0.6K0.4Fe2As2 PIT wires with Ag addition