Effect of growth temperature on properties of bulk GdBa2Cu3Oy superconductors grown by IG process

29th International Symposium on Superconductivity

Nakanishi, Y.^1 ; Pavan Kumar Naik, S.^1 ; Muralidhar, M.^1 ; Murakami, M.^1

Department of Materials Science and Engineering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo

135-8548, Japan^1

关键词: Holding time;    Infiltration growth;    Magnetization measurements;    Microstructural changes;    Optimum temperature;    Processing condition;    Spontaneous nucleation;    Superconducting transitions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012052/pdf
DOI  :  10.1088/1742-6596/871/1/012052

来源: IOP

【 摘 要 】

Recently, the flux pinning performance of Y-123 material was dramatically improved by optimizing the processing conditions during the Infiltration-Growth (IG) process. In the present work, we adapted the top- seeded IG technique and produced several 20 wt.% AgO2doped bulk GdBa2Cu3Oy(GdBCO or Gd-123) samples at different growth temperatures of 983, 985, 986, 987, 989, 990, and 992 °C with the same holding time of 25 h. Our results indicate that the bulk GdBCO samples dwelled at 986 °C is the optimum temperature to produce large Gd-123 growth without spontaneous nucleation. Magnetization measurements on 986 °C dwelled composite showed a sharp superconducting transition with Tc, onsetat 93.6 K. The critical current density at 77 K and self-field was 16,500 A/cm2. The critical current density values are correlated with the microstructural changes in the bulk Gd-123 materials.