The top-seeded infiltration and growth process (TSIG) is very effective method for the preparation of YBa2Cu3O7-x (YBCO) bulk superconductors. In order to improve the levitation force of the samples, a series of singl...The top-seeded infiltration and growth process (TSIG) is very effective method for the preparation of YBa2Cu3O7-x (YBCO) bulk superconductors. In order to improve the levitation force of the samples, a series of single domain YBCO bulk superconductors with different ratios of nanoscale Y2Ba4CuBiOy (YBi2411) inclusions in the solid phase pellet is successfully fabricated by the TSIG technique on the basis of previous research. In the present work, the results of YBCO bulk superconductors with YBi2411 and CeO2 (1 wt%) codoping system indicate that, the optimum doping of YBi2411 is 2 wt%, the size of Y211 particles is reduced compared with the samples without CeO2 doping;the largest levitation force is about 15 N obtained in the samples with optimum YBi2411, which is about two times higher than that of the sample without CeO2 doping. The results are very helpful for the fabrication of high quality single domain YBCO bulk superconductors.展开更多
Bulk YBa2Cu3O7 samples were prepared by PMP method. Through adjusting ingredients and preparation procedures, a pellet with 3. 5 cm in diameter and 0. 9 cm in thickness was synthesized. A mass of 1. 3 kg on a magnet c...Bulk YBa2Cu3O7 samples were prepared by PMP method. Through adjusting ingredients and preparation procedures, a pellet with 3. 5 cm in diameter and 0. 9 cm in thickness was synthesized. A mass of 1. 3 kg on a magnet can be levitated at about 1 mm height at 77 K. The XRD and SEM indicated that magnetic lifting property can be enhanced by addition of Ag2O and Y2BaCuO5.展开更多
文摘The top-seeded infiltration and growth process (TSIG) is very effective method for the preparation of YBa2Cu3O7-x (YBCO) bulk superconductors. In order to improve the levitation force of the samples, a series of single domain YBCO bulk superconductors with different ratios of nanoscale Y2Ba4CuBiOy (YBi2411) inclusions in the solid phase pellet is successfully fabricated by the TSIG technique on the basis of previous research. In the present work, the results of YBCO bulk superconductors with YBi2411 and CeO2 (1 wt%) codoping system indicate that, the optimum doping of YBi2411 is 2 wt%, the size of Y211 particles is reduced compared with the samples without CeO2 doping;the largest levitation force is about 15 N obtained in the samples with optimum YBi2411, which is about two times higher than that of the sample without CeO2 doping. The results are very helpful for the fabrication of high quality single domain YBCO bulk superconductors.
文摘Bulk YBa2Cu3O7 samples were prepared by PMP method. Through adjusting ingredients and preparation procedures, a pellet with 3. 5 cm in diameter and 0. 9 cm in thickness was synthesized. A mass of 1. 3 kg on a magnet can be levitated at about 1 mm height at 77 K. The XRD and SEM indicated that magnetic lifting property can be enhanced by addition of Ag2O and Y2BaCuO5.
基金Supported by National Nature Science Foundation of China(50432050)Young Teacher Innovative Foundation of the Northwestern Polytechnical University(M016201)