TY - JOUR
T1 - Enhanced Superconducting Properties of Air-Processed GdBa 2Cu 3O 7-δ Single Domains with BaCO 3/BaCuO 2-x Addition
AU - Xu, Caixuan
AU - Hu, Anming
AU - Sakai, Naomichi
AU - Hirabayashi, Izumi
AU - Izumi, Mitsuru
N1 - Funding Information:
This work was partly supported by Sasakawa Scientific Research Grant from Japan Science Soci- ety. AH is grateful to the Alexander von Humboldt (AvH) Stiftung, Germany, and Japanese Society for Promotion of Sciences (JSPS) for providing research fellowships.
PY - 2007/5
Y1 - 2007/5
N2 - Single domain GdBa 2Cu 7-δ (Gd123) bulk superconductors were fabricated in air by top-seeding melt-texture growth. Performance of the air-processed Gd123 was successfully enhanced by addition of both BaCO 3 and BaCuO 2-x , which suppress the formation of Gd 1+x Ba 2-x Cu 3O 7-δ solid solutions. The optimum doping amount ranges from 0.05 to 0.15, M BaCO 3 and 0.05 to 0.1, M BaCuO 2-x per molar Gd123. The distribution of the second phase particles was observed by scanning electron microscopy. A narrow band formed by Gd 2BaCuO 5 particle concentration appeared around the seeding zone in both a-b plane and c-growth sector in Gd123 single grain. Trapped magnetic field density reached 0.67, T for sample with 24 mm in diameter and 8, mm in thickness and a high critical current density J c up to 91,200, A/cm 2 was achieved at 77, K under self-field.
AB - Single domain GdBa 2Cu 7-δ (Gd123) bulk superconductors were fabricated in air by top-seeding melt-texture growth. Performance of the air-processed Gd123 was successfully enhanced by addition of both BaCO 3 and BaCuO 2-x , which suppress the formation of Gd 1+x Ba 2-x Cu 3O 7-δ solid solutions. The optimum doping amount ranges from 0.05 to 0.15, M BaCO 3 and 0.05 to 0.1, M BaCuO 2-x per molar Gd123. The distribution of the second phase particles was observed by scanning electron microscopy. A narrow band formed by Gd 2BaCuO 5 particle concentration appeared around the seeding zone in both a-b plane and c-growth sector in Gd123 single grain. Trapped magnetic field density reached 0.67, T for sample with 24 mm in diameter and 8, mm in thickness and a high critical current density J c up to 91,200, A/cm 2 was achieved at 77, K under self-field.
KW - Air processing
KW - BaCO /BaCuO
KW - Critical current density J .
KW - Gd Ba Cu O solid solutions
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U2 - 10.1007/s10948-006-0203-6
DO - 10.1007/s10948-006-0203-6
M3 - Article
AN - SCOPUS:34247178080
SN - 1557-1939
VL - 20
SP - 309
EP - 314
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
IS - 4
ER -