Article
Materials Science, Multidisciplinary
Rahmatul Hidayati, Jin Hee Kim, Soon-Gil Jung, Ki-Sub Cho, Jae Hyun Yun, Jong-Soo Rhyee
Summary: We investigated the superconducting properties of medium entropy alloys Nb2/5Hf1/5Zr1/5Ti1/5 synthesized by different methods. The samples exhibited different superconducting transition temperatures and critical magnetic fields. The spark plasma sintering method showed better performance in critical current density, suggesting possible practical applications.
Article
Chemistry, Physical
Hyeondeok Jeong, Haiwoong Park, Chan-Joong Kim, Byung-Hyuk Jun
Summary: Planetary milling of MgB4 precursor in toluene results in decreased grain size and improved critical current density of bulk MgB2, although it may lead to deterioration of crystallinity. The increase in magnetic flux pinning sites such as grain boundary and lattice distortion contributes to the enhancement of critical current density.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Applied
L. H. Jin, X. Y. Xu, J. Q. Feng, G. Q. Liu, G. F. Jiao, S. N. Zhang, Q. B. Hao, C. S. Li, P. X. Zhang
Summary: Bi2Sr2CaCu2Ox (Bi-2212) single-filamentary and multi-filamentary wires were fabricated using the powder in tube (PIT) process. It was found that the multi-filamentary wires exhibited better performance due to their good grain orientation and microstructure.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Materials Science, Multidisciplinary
Xinhua Li, Xin Wen, Zunfeng Du, Aslam Khan, Zongqing Ma
Summary: In this study, Nb3Al bulk superconductors were synthesized through mechanical alloying and sintering process, with an improved critical current density (J(c)) performance by optimizing process parameters such as ball milling time, sintering temperature, and holding time. The optimal ball milling time was found to be 20 hours, while excessive milling deteriorated the J(c) performance due to introduced impurities. Holding time during sintering affected grain size, and sintering temperature and holding time were significant for grain connectivity in Nb3Al. A high J(c) value of 2.5 x 10(4) A/cm(2) was achieved under specific sintering conditions.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Chandra Shekar Gantepogu, Chia-Ming Yang, Peramaiyan Ganesan, In-Gann Chen, Ming-Jye Wang, Judith MacManus-Driscoll, Seung-Hyun Moon, Connie Wang, Maw-Kuen Wu
Summary: The GdBa2Cu3O7-x (Gd123) films with self-assembled BaZrO3 (BZO) nanostructure on ion-beam-assisted deposited MgO substrate showed enhanced critical current density JC and flux pinning force (Fp) under high magnetic fields. The addition of a 3D BZO nanostructure network improved the performance of the superconductor coated conductor and could be further optimized for better results.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Physical
R. Algarni, M. A. Almessiere, Y. Slimani, E. Hannachi, F. Ben Azzouz
Summary: Adding 10 nm nano-dysprosium oxide particles (Dy2O3) to YBa2Cu3O2-d has a significant impact on the pinning mechanisms and strength of pinning centers, enhancing the flux pinning properties. NP-Dy2O3 weakens the linkage between grains and decreases the inter-granular critical current density under low temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Zhen-Kun Jin, Cong Liu, Chao Yao, Liu Li, He Huang, Dong-Liang Wang, Chi-Heng Dong, Kai Wang, Xian-Ping Zhang, Satoshi Awaji, Yan-Wei Ma
Summary: Iron-based superconductors have shown potential for high-field applications, with high transport critical current density and mechanical strength being important factors. This study fabricated seven-filament Cu/Ag-sheathed (Ba,K)Fe2As2 tapes from round and square wires, finding that tapes from square wires exhibited better uniformity and performance. Using square drawing dies improved the performance of the tapes, with high transport J(c) values achieved under certain annealing conditions. This suggests potential applications of Cu/Ag (Ba,K)Fe2As2 tapes in high-magnetic-field regions.
Article
Chemistry, Physical
Honggang Chen, Yongbo Li, Yao Qi, Mingzhong Wang, Hongyan Zou, Xiaopeng Zhao
Summary: The study investigated the critical current density and Meissner effect of smart meta-superconductors MgB2 and Bi(Pb)SrCaCuO. It was found that certain dopants and the introduction of inhomogeneous phases can increase the critical current density and the temperature at which the Meissner effect occurs.
Article
Physics, Applied
Xiao Liu, Yi Shi, Fang Liu, Hongjun Ma, Huajun Liu, Chao Zhou, Yuntao Song, Jian Gao, Yanchang Zhu, Xianping Zhang, Dongliang Wang, Yanwei Ma, Zhan Zhang, Shaoqing Wei, Jinggang Qin
Summary: The Chinese Academy of Sciences' Institute of Electrical Engineering has successfully fabricated 100 m class Ba1-x K(x) Fe2As2 (Ba-122) 7-filamentary iron-based superconducting (IBS) tapes with excellent performance. Tests on the Ba-s and Ba-100 samples were conducted under various strains using U-shaped bending spring devices, revealing their reversibility even under a compressive strain of -0.65%. Furthermore, the reversible tensile strain limits of the Ba-s and Ba-100 samples were 0.25% and 0.28%, respectively, increasing to 0.38% and 0.41% after considering the effect of the cooling process.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Ouyang Cheng, Hongpeng Zheng, Qiwen Chen, Hezhou Liu, Huanan Duan
Summary: This study investigates the role of morphology in the resistance of garnet-type electrolytes to lithium filaments. The findings reveal a strong correlation between the microscopic morphology of the solid electrolyte and its resistance to lithium filaments. The results suggest that reducing pores and increasing grain boundaries can improve the performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Xiao Liu, Shaoqing Wei, Yi Shi, Fang Liu, Chao Zhou, Qianbo Li, Yijie Li, Linfei Liu, Zhixiang Shi, Li Ren, Ying Xu, Pu Duan, Zhixing Yang, Junyi Ge, Yanpeng Qi, Yuntao Song, HuaJun Liu, Zhan Zhang, Jinggang Qin
Summary: A FeSe0.5Te0.5 coated conductor with copper encapsulation was developed to enhance its mechanical performance. The copper encapsulated conductor showed improved critical performance and a higher irreversible tensile strain limit compared to the bare conductor.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Hiroto Kambe, Iwao Kawayama, Naoya Kitamura, Ataru Ichinose, Takumu Iwanaka, Toshiaki Kusunoki, Toshiya Doi
Summary: A novel fabrication technique involving the formation of a Nb protective layer and high-temperature post-annealing was proposed to increase the critical current density of MgB2 films under an external magnetic field. Analyses of crystal structure and composition confirmed the effectiveness of high-temperature annealing in suppressing Mg evaporation and oxidation. The MgB2 film annealed at 650 degrees C exhibited the highest reported J(c) value to date for MgB2 films, wires, and bulk samples.
APPLIED PHYSICS EXPRESS
(2021)
Article
Physics, Applied
Yue Liu, Ruilong Wang, Zhiwei Wen, Jun Shu, Yajing Cui, Yongliang Chen, Yong Zhao
Summary: A slice-shaped LaO1-xBiS2 (x = 0.07) superconducting single crystal was grown using a high-temperature flux method, showing purity in structure and potential as a two-gap superconductor with a relatively small superconducting anisotropy parameter.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2021)
Article
Physics, Applied
M. Shibalov, A. M. Mumlyakov, I. Trofimov, E. R. Timofeeva, A. P. Sirotina, E. A. Pershina, A. M. Tagachenkov, Y. Anufriev, E. Zenova, N. Porokhov, M. A. Tarkhov
Summary: This study utilized plasma-enhanced atomic layer deposition to produce ultrathin superconductive niobium nitride films with a record resistivity of 147 microohm·cm. Experimental findings revealed that the resistivity of the films influences the critical current density.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Jin Hee Kim, Rahmatul Hidayati, Soon-Gil Jung, Yusuff Adeyemi Salawu, Heon-Jung Kim, Jae Hyun Yun, Jong-Soo Rhyee
Summary: We synthesized the high entropy alloy (HEA) Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 compound using planetary ball milling and spark plasma sintering (SPS) method. The sintered HEA sample exhibited superconducting properties with improved critical current density (Jc) and stable remanent magnetization (M-rem), making it suitable for practical applications.
Article
Physics, Applied
He Huang, Chao Yao, Chiheng Dong, Xianping Zhang, Dongliang Wang, Shifa Liu, Zhe Cheng, Yanchang Zhu, Yanwei Ma
Summary: Using the EBSD technique, the microstructure of hot-pressed (HP) and flat-rolled (FR) Ba-122 tapes was analyzed. The results indicated that HP tapes exhibited better texture and grain connectivity, while FR tapes had smaller grain size. It is recommended to find a balance point that promotes grain orientation and maintains moderate grain size to improve the transport properties of IBS tapes further.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Applied
Xinxing Qian, Shili Jiang, Hangwei Ding, Pengcheng Huang, Yuchun Pang, Donghui Jiang, Xianping Zhang, Yanwei Ma, Wenge Chen
Summary: This paper focuses on the development of iron-based superconductor (IBS) coils made by a wind and react method, introducing technological improvements to enhance performance. High-performance tapes and frames are used for winding the coils, with detailed manufacturing processes explained.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2021)
Article
Physics, Applied
Peng Yang, He Huang, Meng Han, Wenwen Guo, Chang Tu, Dongliang Wang, Xianping Zhang, Yanwei Ma
Summary: The effect of the thickness of the superconducting core on the microstructure and superconducting properties of Ba-122 monofilamentary tapes was investigated. It was found that the magnetic critical current density increases with distance from the core-sheath interface. The central region of the superconducting core showed higher hardness and better texture, while a reaction layer was present at the Ag-superconductor interface. To improve the superconductivity of Ba-122 tapes, reducing the reaction layer and eliminating inhomogeneity at the core-sheath interface is necessary.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Meng Han, Chao Yao, Xianping Zhang, Dongliang Wang, Chiheng Dong, Cong Liu, He Huang, Peng Yang, Wenwen Guo, Chang Tu, Shifa Liu, Xinyuan Liu, Qianjun Zhang, Zhihao Zhang, Jianxin Xie, Yanwei Ma
Summary: This study examined the mechanical properties of BaK-122 IBS powder and obtained the density-dependent mechanical constitutive equation for the first time. The relationship between density and Vickers hardness was established, and a method for characterizing the BaK-122 core density was developed. The study also revealed the effects of sheath materials and preparation method on the BaK-122 core's stress state and density, providing guidance for preparing high-density BaK-122 wires and tapes. Furthermore, a generalized relationship between density and superconducting transport J(c) was established, confirming the positive correlation between rho(core) and J(c). The critical factors affecting the transport performance were summarized.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Review
Multidisciplinary Sciences
Zhe Cheng, Xianping Zhang, Chiheng Dong, Yanwei Ma
Summary: The 122-type iron-based superconductor (IBSC) has advantages but also limitations. The recently discovered 1144-type IBSC material shows great potential for high-field applications. The fabrication process of CaKFe4As4 single crystals and polycrystals is mature, but further research is needed to improve the critical current density (J(c)) of wires and tapes.
CHINESE SCIENCE BULLETIN-CHINESE
(2022)
Article
Physics, Applied
Yuzhuo Chen, Wenchao Li, Cong Liu, He Huang, Chao Yao, Xianping Zhang, Dongliang Wang, Fang Liu, Huajun Liu, Yanwei Ma
Summary: In this study, the effects of precursor powder particle size on Ag-sheathed powder-in-tube Ba1-xKxFe2As2 (Ba-122) superconducting tapes were investigated. It was found that a short grinding time resulted in damage to the interface between the Ba-122 core and Ag sheath, leading to a decline in mass density and a fluctuation in transport current density (J(c)). As the grinding time was extended, the J(c) became more uniform due to improved homogeneity but decreased with a reduction in average particle size. The results demonstrated the importance of controlling the homogeneity and particle size of precursor powders for achieving superior J(c) in iron-based superconducting tapes.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Zhen Zhang, Yingzhe Wang, Ze Feng, Jinrui Shi, Chengtao Wang, Daozheng Li, Huanli Yao, Chunyan Li, Rui Kang, Litong Li, Qingjin Xu
Summary: High field superconducting magnets are subjected to a large Lorenz force during operation, making it essential to measure the strain in the superconducting coils. Compared with traditional resistance strain sensors, fiber optic sensors based on fiber Bragg gratings offer significant advantages in high field applications.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Chunyan Li, Rui Kang, Yanchang Zhu, Zhen Zhang, Yingzhe Wang, Chengtao Wang, Jin Zhou, Huanli Yao, Xianping Zhang, Dongliang Wang, Cong Liu, Fang Liu, Yanwei Ma, Qingjin Xu
Summary: The bending effect and properties of iron-based superconductor (IBS) tapes were systematically investigated in this study. It was found that the transport critical current decreases with smaller bending diameters when the bending diameter is smaller than 30 mm. Many cracks were observed in the outermost superconducting core of the bent tapes, especially in those with a bending diameter of 10 mm. The stress in the bent tapes during the bending process was simulated and compared.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Materials Science, Multidisciplinary
Wenchao Li, He Huang, Chen Guo, Chang Tu, Xinyuan Liu, Chao Yao, Xianping Zhang, Yanwei Ma
Summary: Iron-based superconductors have attracted extensive attention in the field of superconductivity mechanisms and high-field applications due to their ultra-high upper critical fields and low anisotropy. The fabrication of superconducting wires and tapes with high critical current density and low cost is a major goal in the application research of these materials. In this study, (Ba,K)Fe2As2 (Ba-122) tapes with a Cu/Ag composite sheath were successfully fabricated through a pre-composite process, and achieved a high J(c) of 6.2 x 10(4) A cm(-2) at 10 T and 4.2 K. The high-density superconducting cores, large-size grains, and uniform element distribution were identified as the main factors contributing to the high J(c). These results suggest that the low-cost Ba-122 tapes with pre-composite Cu/Ag sheath have great potential for practical applications in the future.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Chiheng Dong, Meng Han, Wenwen Guo, Xianping Zhang, Cong Liu, He Huang, Chao Yao, Dongliang Wang, Huajun Liu, Yanwei Ma
Summary: Iron-based superconducting wires fabricated by the powder-in-tube method with a stainless steel/ AgSn/Ag composite architecture and a scalable groove rolling process exhibit high-performance and dense superconducting filaments. The achieved critical current density is the highest reported in iron-based multifilament wires. Detailed analysis reveals the deformation mechanism of Ba0.6K0.4Fe2As2 grains and its influence on supercurrent transport properties, suggesting that higher critical current density can be achieved by improving grain texture. This method provides a simple and cost-effective approach to densify practical superconducting wires and can be scaled up to long wire productions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Xiao Liu, Yi Shi, Fang Liu, Hongjun Ma, Huajun Liu, Chao Zhou, Yuntao Song, Jian Gao, Yanchang Zhu, Xianping Zhang, Dongliang Wang, Yanwei Ma, Zhan Zhang, Shaoqing Wei, Jinggang Qin
Summary: The Chinese Academy of Sciences' Institute of Electrical Engineering has successfully fabricated 100 m class Ba1-x K(x) Fe2As2 (Ba-122) 7-filamentary iron-based superconducting (IBS) tapes with excellent performance. Tests on the Ba-s and Ba-100 samples were conducted under various strains using U-shaped bending spring devices, revealing their reversibility even under a compressive strain of -0.65%. Furthermore, the reversible tensile strain limits of the Ba-s and Ba-100 samples were 0.25% and 0.28%, respectively, increasing to 0.38% and 0.41% after considering the effect of the cooling process.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
Xi Xia, Yanchang Zhu, Chundong Zhu, Meng Han, Cong Liu, Dongliang Wang, Xianping Zhang, Yanwei Ma
Summary: The constitutive behavior of BaK-122 powder was studied and a modified Drucker-Prager cap model was proposed to describe its behavior. Material parameters were determined through experimental tests including uniaxial compression, radial compression, and mould pressing. Finite element simulations of pressing and drawing processes were carried out, showing good agreement with experimental results. This model lays a foundation for simulating the preparation process of BaK-122 wires and tapes and guiding actual production.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Qiao Sun, Zhongtang Xu, Chiheng Dong, He Huang, Dongliang Wang, Xianping Zhang, Yanwei Ma
Summary: In this study, the phase separation in Fe(Se, Te) was successfully tuned by adding FeF2, resulting in the formation of a macroscopically ordered phase separation. The regular phase separation morphology and fixed phase composition enhanced the flux pinning behavior and improved the superconducting performance of Fe(Se, Te).
MATERIALS TODAY ADVANCES
(2023)
Article
Physics, Applied
Hangwei Ding, Hang Zhao, Pengcheng Huang, Lei Yu, Jianyuan Xu, Zhen Fang, Zhiyou Chen, Dongliang Wang, Xianping Zhang, Wenge Chen, Yanwei Ma
Summary: For the first time, this study combines iron-based superconductors with high field insert coil technology to generate a higher magnetic field. Through the fabrication and evaluation of large-sized iron-based superconducting double pancake coils, a superior performing insert coil is formed and tested under different background fields. The test results show that the insert coil successfully generates high magnetic fields under different background fields, surpassing previous performance tests.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Chen Guo, Dongliang Wang, Xianping Zhang, Meng Han, Minghui Tang, Cong Liu, Xinyuan Liu, Fang Liu, Huajun Liu, Yanwei Ma, Zizhao Gan
Summary: This study investigates the factors influencing carbon substitution efficiency in MgB2 superconductors through a two-stage carbon doping process. The study found that MgB2 tapes prepared using nano amorphous boron powder exhibit lower carbon substitution efficiency compared to those prepared using micron crystalline boron powder.
MATERIALS TODAY PHYSICS
(2023)
