Fabrication of (Ba,Na)Fe₂As₂ round wires and tapes using HIP process

We fabricated round wires and tapes of (Ba,Na)Fe₂As₂ using hot isostatic press (HIP) process, and evaluated their critical current density (J_c ). Polycrystalline powders were synthesized by two methods by mixing raw materials in a planetary ball mill or by using pre-synthesized precursors (BaAs, NaAs, Fe₂As). Transport J_c of best wire reached 95 kA/cm² under self-field and 40 kA/cm² at 100 kOe. We also fabricated HIP tapes using the same powder and discuss their detailed characterizations. In particular, X-ray diffraction is extensively applied to the evaluation of the degree of texturing of the tape, and discuss its relationship with J _c.