Doubled J_c of Bi-2212 superconducting films by small addition of pure 14:24AEC in Bi-2212 precursor powder

Pure (Sr,Ca)₁₄Cu₂₄O_x(14:24AEC) was prepared and added into Bi_2.1Sr_1.96Ca_1.0Cu_2.0O_x(Bi-2212) precursor powder to prepare Bi-2212 superconducting films for the first time. Utilizing the dip coating method and partial melting process (PMP), three distinct Bi-2212 superconducting films were fabricated using Bi-2212 powders with the addition of 0 wt%, 1 wt%, and 3 wt% of 14:24AEC, respectively. It was discovered the addition of 1 wt% 14:24AEC optimized the Sr-to-Ca ratio in the Bi-2212 film (Bi-2212-1%), leading to a more consistent phase evolution for both 14:24AEC and Bi₉Sr₁₁Ca₅O_x(9:16CF), and resulting in the highest purity and texture of Bi-2212 among the samples. Consequently, Bi-2212-1% exhibited the highest critical current density(J_c), and its J_c doubled that of the Bi-2212 film without the addition of 14:24AEC. This study suggests that the addition of pure 14:24AEC into Bi-2212 precursor powders could significantly enhance the J_c of Bi-2212 wires in future applications.