Magnetic field processing to enhance critical current densities of MgB2 superconductors

作者：Dou S X^*; Yeoh W K; Shcherbakova O; Horvat J; Kim J H; Pan A V; Wexler D; Li Y; Li W X; Ren Z M; Munroe P; Cui J Z

来源：Applied Physics Letters, 2006, 89(20): 202504.

DOI：10.1063/1.2388126

A magnetic field of up to 12 T was applied during the sintering process of pure MgB2 and carbon nanotube (CNT) doped MgB2 wires. The authors have demonstrated that magnetic field processing results in grain refinement, homogeneity, and enhancement in J(c)(H) and H-irr. The extent of improvement in J(c) increases with increasing field. The J(c) for a 10 T field processed CNT doped sample increases by a factor of 3 at 10 K and 8 T and at 20 K and 5 T, respectively. H-irr for the 10 T field processed CNT doped sample reached 9 T at 20 K, which exceeded the best value of SiC doped MgB2 at 20 K. Magnetic field processing reduces the resistivity in CNT doped MgB2, straightens the entangled CNTs, and improves the adherence between CNTs and the MgB2 matrix.

• 出版日期2006-11-13
• 单位上海大学; 东北大学