[12a-N402-1~11] 11.2 Thin and thick superconducting films, coated conductors and film crystal growth

[12a-N402-3] Control of chemical composition of Bi2223 Materials for high field applications

〇Yoshinobu Miyamoto¹, Takanori Motoki¹, Soichiro Takeda², Takayoshi Nakashima², Satoru Yamade², Jun-ichi Shimoyama¹ (1.Aoyama Gakuin Univ., 2.SEI, Ltd.)

Keywords:superconductor, Bi2223

(Bi,Pb)₂Sr₂Ca₂Cu₃O_y[Bi2223] superconducting tapes have already been used in various applications because of practical high critical current properties. It is known that the J_c of Bi2223 is lower than that of RE123 materials at high temperature and in magnetic field due to its large electromagnetic anisotropy. However, the plan has been shown that increasing substitution of Pb for Bi sites is effective for improving critical current properties.In this study, manufacturing of Bi2223 magnetically aligned bulks that increasing actual substitution level of Pb in Bi2223 crystals with different chemical compositions and optimization of heat treatment conditions were carried out.