Recently, we developed superconducting joint between Bi2223 tapes without intermedium using joint by incongruent melting (JIM) method [1]. In this study, we are started to develop a joint intermedium composited mainly BSCCO with composition of 2:2:3:4 for joining bismuth-based superconducting wires [1]. The raw materials are Bi₂O₃, SrCO₃, CaCO₃ and CuO. In heat treatment, the highest temperature is 750 °C with holding time of 10 hours. The temperature is appropriate to composite BSCCO in bulk without generation and orientation of Bi2212 and Bi2223 phase. In results, X-ray diffraction patterns for powders and bulks were obtained. As shown in Figure 1, the BSCCO peaks like Bi2234, Bi2245 and Bi2201 pheses appear in all patterns. In next study, we are going to develop superconducting joint by using this compound, and the results will be reported in ISS2020.

[1] X. Jin, et al., Superconductor Science and Technology 32 (2019) 035011.

Acknowledgements:
This work was supported by JST-Mirai Program Grant Number JPMJMI17A2, MEXT project of Leading Initiative for Excellent Young Researchers (LEADER) Project ID 16810210, and JSPS KAKENHI Grant Number JP18K04719, Japan.

Keywords: BSCCO, Superconducting Joint, Bulk, Powder