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
Top seeded infiltration and growth technique(TSIG)is an effective method for the preparation of high quality large YBa2Cu3O7-x(YBCO)bulk superconductors.In this paper,single domain YBCO bulk superconductors,with diffe...Top seeded infiltration and growth technique(TSIG)is an effective method for the preparation of high quality large YBa2Cu3O7-x(YBCO)bulk superconductors.In this paper,single domain YBCO bulk superconductors,with different Y2Ba4CuWOy(YW2411)additions,have been fabricated by TSIG process.the solid phase pellet is made of a mixture of Y2BaCuO5(Y211)+xwt%YW2411 powders,x=0,1,3,5,7,9.The growth morphology,microstructure and levitation force of the YBCO bulks have been investigated,it is found that the levitation force is increasing from 23.05 to 33.6 N with the increasing of YW2411 addition from 0 to 5wt%,and decreasing from 33.6 to 21.59 N with the increasing of YW2411 addition from 5 to 9wt%,the largest levitation force is obtained when the YW2411 content is about 5wt%.This is very important for us to fabricate high quality YBCO bulk superconductors.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)
基金National Natural Science Foundation of China(51033026,50872079)National High Technology Research and Development Program of China("863"Program,2007AA03Z241)Fundamental Research Funds for the Central Universities(GK200901017)
文摘Top seeded infiltration and growth technique(TSIG)is an effective method for the preparation of high quality large YBa2Cu3O7-x(YBCO)bulk superconductors.In this paper,single domain YBCO bulk superconductors,with different Y2Ba4CuWOy(YW2411)additions,have been fabricated by TSIG process.the solid phase pellet is made of a mixture of Y2BaCuO5(Y211)+xwt%YW2411 powders,x=0,1,3,5,7,9.The growth morphology,microstructure and levitation force of the YBCO bulks have been investigated,it is found that the levitation force is increasing from 23.05 to 33.6 N with the increasing of YW2411 addition from 0 to 5wt%,and decreasing from 33.6 to 21.59 N with the increasing of YW2411 addition from 5 to 9wt%,the largest levitation force is obtained when the YW2411 content is about 5wt%.This is very important for us to fabricate high quality YBCO bulk superconductors.
