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The effect of Ag addition (0-20 wt%) on polycrystalline Sr0.6K0.4Fe2As2superconductor has been investigated. It is found that the critical transitiontemperature Tc was not depressed, and the irreversibility field Hirr andhysteresis magnetization were significantly enhanced upon Ag addition.Characterization study reveals that larger grains are observed in the Ag-addedsamples. Moreover, the formation of glassy phase as well as amorphous layer,which are present in almost all the grain edges and boundaries in pure samples,are suppressed by Ag addition. The improvement of superconducting properties inAg-added samples may originate from the enlargement of grains as well as betterconnections between grains

The role of silver addition on the structural and superconducting properties of polycrystalline Sr0.6K0.4Fe2As2