Optimization of intergrain connection in high-temperature superconductor Bi2Sr2CaCu2Ox

doi:10.1088/1674-1056/24/7/077401

中国物理B ›› 2015, Vol. 24 ›› Issue (7): 77401-077401.doi: 10.1088/1674-1056/24/7/077401

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Optimization of intergrain connection in high-temperature superconductor Bi₂Sr₂CaCu₂O_x

李成山, 张胜楠, 郝清滨, 马小波, 卢天倪, 张平祥

Superconducting Materials Research Center, Northwest Institute for Non-ferrous Metal Research, Xi'an 710016, China

收稿日期:2014-11-24 修回日期:2015-02-12 出版日期:2015-07-05 发布日期:2015-07-05
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2011CBA00104), the National Natural Science Foundation of China (Grant No. 51472206), the ITER Project of China (Grant No. 2013GB110001), and the Program for Innovative Research Team in Shaanxi Province, China (Grant No. 2013KCT-07).

Optimization of intergrain connection in high-temperature superconductor Bi₂Sr₂CaCu₂O_x

Li Cheng-Shan (李成山), Zhang Sheng-Nan (张胜楠), Hao Qing-Bin (郝清滨), Ma Xiao-Bo (马小波), Lu Tian-Ni (卢天倪), Zhang Ping-Xiang (张平祥)

Superconducting Materials Research Center, Northwest Institute for Non-ferrous Metal Research, Xi'an 710016, China

Received:2014-11-24 Revised:2015-02-12 Online:2015-07-05 Published:2015-07-05
Contact: Zhang Sheng-Nan E-mail:snzhang@c-nin.com
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2011CBA00104), the National Natural Science Foundation of China (Grant No. 51472206), the ITER Project of China (Grant No. 2013GB110001), and the Program for Innovative Research Team in Shaanxi Province, China (Grant No. 2013KCT-07).

摘要/Abstract

摘要： A modified spark plasma sintering (SPS) technique was developed for the fabrication of Bi₂Sr₂CaCu₂O_x (Bi-2212) superconducting bulks with better intergrain connections. The influences of the modified SPS process on the microstructures, intergrain connections, and related superconducting properties were systematically analyzed. The modified SPS process can not only increase the final density of the bulk samples but also enhance the texture structures. Clean grain boundaries were obtained instead of the intergrain amorphous layers. Therefore the intergranular properties were obviously improved. Due to the better intergrain connections and the stronger flux pinning properties, the critical current densities of the Bi-2212 bulks obtained via the modified SPS process were greatly increased. The obtained improvements imply the possibility for the modified SPS technique to be used for enhancing the superconducting properties of the Bi-2212 tapes.

关键词: high temperature superconductor, Bi₂Sr₂CaCu₂O_x (Bi-2212), spark plasma sintering, weak link

Abstract: A modified spark plasma sintering (SPS) technique was developed for the fabrication of Bi₂Sr₂CaCu₂O_x (Bi-2212) superconducting bulks with better intergrain connections. The influences of the modified SPS process on the microstructures, intergrain connections, and related superconducting properties were systematically analyzed. The modified SPS process can not only increase the final density of the bulk samples but also enhance the texture structures. Clean grain boundaries were obtained instead of the intergrain amorphous layers. Therefore the intergranular properties were obviously improved. Due to the better intergrain connections and the stronger flux pinning properties, the critical current densities of the Bi-2212 bulks obtained via the modified SPS process were greatly increased. The obtained improvements imply the possibility for the modified SPS technique to be used for enhancing the superconducting properties of the Bi-2212 tapes.

Key words: high temperature superconductor, Bi₂Sr₂CaCu₂O_x (Bi-2212), spark plasma sintering, weak link

中图分类号: (Cuprate superconductors)

74.72.-h

74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition) 74.25.-q (Properties of superconductors) 74.25.Sv (Critical currents)

李成山, 张胜楠, 郝清滨, 马小波, 卢天倪, 张平祥. Optimization of intergrain connection in high-temperature superconductor Bi₂Sr₂CaCu₂O_x[J]. 中国物理B, 2015, 24(7): 77401-077401.

Li Cheng-Shan (李成山), Zhang Sheng-Nan (张胜楠), Hao Qing-Bin (郝清滨), Ma Xiao-Bo (马小波), Lu Tian-Ni (卢天倪), Zhang Ping-Xiang (张平祥). Optimization of intergrain connection in high-temperature superconductor Bi₂Sr₂CaCu₂O_x[J]. Chin. Phys. B, 2015, 24(7): 77401-077401.

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Optimization of intergrain connection in high-temperature superconductor Bi₂Sr₂CaCu₂O_x

Optimization of intergrain connection in high-temperature superconductor Bi₂Sr₂CaCu₂O_x

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