Abstract Characterizations of round wires iron-based superconductors were performed by using two different X-ray techniques. The core the wire turns out to be concentrically textured. texturing parameter ( r ) defined = I (002)/ (103) has a clear correlation with value critical current density J c wire. Using ~18 m-long (Ba, A )Fe 2 As : K, Na) wires, small magnets was constructed and successfu...