Article
Materials Science, Ceramics
L. H. Jin, G. Q. Liu, X. Y. Xu, G. F. Jiao, H. L. Zheng, Q. B. Hao, S. N. Zhang, C. S. Li, P. X. Zhang
Summary: Bi2Sr2CaCu2Ox (Bi-2212) precursor powders were synthesized by the oxalate freeze drying (OFD) method, which could shorten processing steps and improve fabrication efficiency. The powders with large surface area and small particle size were beneficial for the rapid and homogeneous formation of Bi-2212. The high engineering critical current densities and critical current densities obtained in Bi-2212 wires indicated the potential of OFD method for mass production of high performance Bi-2212 wires.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Bo Yang, Qingbin Hao, Peng Xiao, Guoqing Liu, Gaofeng Jiao, Kai Yao, Xiaoyan Xu, Lijun Cui, Shengnan Zhang, Chengshan Li, Jianqing Feng
Summary: The Bi2Sr2CaCu2Ox (Bi-2212) precursor powder was successfully synthesized using the spray pyrolysis method, and the powder was made into high critical current density Bi-2212/Ag-alloy wire. The method resulted in low segregation due to high-temperature calcination during the spray pyrolysis process. The spray pyrolysis method shows potential for preparing high-performance Bi-2212 wire.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Ceramics
I. Husek, P. Kovac, T. Melisek, M. Hain
Summary: Superconducting joints between single-core MgB2/Ni and MgB2/Nb wires were manufactured using an internal Mg diffusion (IMD) process and scarf joints architecture. The transport currents of the joints were measured and compared with the currents of the used MgB2 wires under different conditions. The structure of the joints was analyzed by an optical microscope. It was found that adding boron powder between the joined wires allows for the creation of superconducting current paths. The interaction between Mg and Ni inside the joint area affects the formation of the MgB2 phase and degrades the critical current, while joints between MgB2/Nb wires have no inter-metallic interactions and show large critical currents.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Umit Erdem
Summary: The study demonstrates that the optimum trivalent Ho/Bi partial substitution enhances the crystal structure and superconducting properties of Bi-2212 materials, indicating its importance in improving performance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Dipak Patel, Akiyoshi Matsumoto, Hiroaki Kumakura, Minoru Maeda, Sun-Hu Kim, Hao Liang, Yusuke Yamauchi, Seyong Choi, Jung Ho Kim, Md Shahriar A. Hossain
Summary: The study introduced superconducting joints made with 36 filaments magnesium diboride wires, showing characteristics with a critical temperature of 34.4K and critical current of 38.5A at 10K. Unconventional behavior of the joint was observed at 20K due to field trapping in the MgB2 bulk.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Electrical & Electronic
Mehmet Gursul
Summary: This study extensively examines the changes in microstructural, electrical, and superconducting properties of Bi2Sr2CaCu2-xLixOy ceramics with the substitution of Li for Cu. Solid state reaction method was used for sample production due to its simplicity, affordability, and reproducibility. XRD analysis showed that Bi-2212 was the main phase in all samples, with minor reflections of Bi-2201 and Bi-2223. SEM images revealed that randomly oriented flaky grains were partially replaced by rod-like and rectangular prism-type grains that were closely packed. The resistivity transitions under magnetic fields were investigated, and important parameters such as critical transition temperatures, residual resistivity, irreversibility fields, upper critical fields, coherence length, and penetration depth were deduced from the resistivity measurements. These parameters improved with increasing Li-content and reached their optimal value in the x = 0.10 sample. Overall, the appropriate incorporation of Li into Bi-2212 can be a useful tool for practical applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Shaon Barua, Daniel S. Davis, Yavuz Oz, Jianyi Jiang, Eric E. Hellstrom, Ulf P. Trociewitz, David C. Larbalestier
Summary: In summary, Bi2Sr2CaCu2O8+x (Bi-2212) is currently the only high-temperature superconductor capable of achieving a high critical current density under high magnetic fields. Recent improvements in Bi-2212 round wires have been attributed to optimization of the heat treatment process and a transition to a finer and more uniform powder. The distribution of critical current in Bi-2212 wires is compared to other materials like Nb-Ti, showing that the spread of critical current in Bi-2212 wires is about twice the relative standard of high-J(c) Nb-Ti well below H-irr. There is no obvious contribution of Bi-2212 anisotropy to the critical current distribution.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Chemistry, Physical
Xueqian Liu, Jixing Liu, Botao Shao, Shengnan Zhang, Yanhong Zhang, Heng Li, Wen Zhang, Hao Cao, Jianqing Feng, Chengshan Li, Jianfeng Li, Pingxiang Zhang
Summary: Cryogenic drawing under low temperature has been shown to significantly improve the mechanical properties, densification, and uniformity of Bi-2212/Ag round wires. This method can effectively enhance the performance of the metallic sheath and the superconducting properties of the wires.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
A. Angrisani Armenio, A. Leveratto, G. de Marzi, A. Traverso, C. Bernini, G. Celentano, A. Malagoli
Summary: One unique feature of Bi-2212/Ag wires is the network of bridges formed by grains grown through the Ag matrix, which results in high critical current density but also increases AC losses and electrical coupling. This study investigates the behavior of these bridges under applied magnetic field and temperature, and their implications on electrical coupling, providing valuable insights for magnet design.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Minghu Shen, Gaoyang Zhao, Li Lei, Hangkang Ji, Pengrong Ren
Summary: In this study, Bi2Sr2Ca1Cu2O8+sigma (Bi-2212) superconducting thin films were successfully prepared on LaAlO3 single crystal substrate using a sol-gel method. The thin films exhibited good epitaxial growth characteristics, with a critical transition temperature of 87 K, and showed the intrinsic Josephson effect.
CERAMICS INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
A. Leveratto, A. Angrisani Armenio, A. Traverso, G. De Marzi, G. Celentano, A. Malagoli
Summary: This study explores the properties of high temperature superconductor Bi-2212 at temperatures above 4.2K and its application in cryogen-free high field magnets, providing reference data on the behavior of the only isotropic wire for high field application.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
Zhen-Chuang Zhang, Hai-Shan Zhou, Jing-Gang Qin, Dong-Sheng Yang, Guang-Nan Luo
Summary: This study investigated the effects of gamma-ray irradiation on the superconducting properties of Bi-2212 wires, revealing changes in microstructures and critical current. The irradiation led to the generation of defects and an amorphous structure in the samples, affecting the superconducting behavior.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
H. Basma, S. Abbas, W. Labban, R. Awad, M. Matar
Summary: This study investigates the effect of CdO nanoparticles on the (Bi, Pb)-2212 superconducting phase. The addition of CdO enhances grain connectivity and improves the superconducting transition temperature and critical current density, with the optimal effect observed at x = 0.05 wt% CdO.
Article
Chemistry, Physical
Daniel Gajda, Andrzej J. Zaleski, Andrzej J. Morawski, Malgorzata Malecka, Lan Maria Tran, Matt Rindfleisch, Tomasz Durejko, Tomasz Czujko
Summary: By annealing the structure under high isostatic pressure, the structure of multifilament MgB2 wires made by the powder-in-tube method can be texturized, leading to continuous fibers with high critical current density and small grain size.
Article
Materials Science, Multidisciplinary
Liu Guoqing, Jin Lihua, Xu Xiaoyan, Jiao Gaofeng, Zheng Huiling, Hao Qingbin, Cui Lijun, Yu Zeming, Li Chengshan
Summary: In this study, Bi-2212 precursor powders were prepared using spray pyrolysis and co-precipitation methods, and the intermediate phase evolution of Bi-2212 grains was investigated. The results showed that the phase formation rate of Bi-2212 grains prepared by spray pyrolysis was improved, while the residual carbonates in co-precipitation powders hindered the formation of Bi-2212 grains.
RARE METAL MATERIALS AND ENGINEERING
(2022)