检索结果-南通市图书馆

Advances in Manufacturing 2023年第3期11卷 523-540页

作者： Dong-Xu Wang Jing Chen Di-Fan Zhou Chuan-Bing Cai Shanghai Key Laboratory of High Temperature Superconductors Shanghai Frontiers Science Center of Quantum and Superconducting Matter StatesDepartment of PhysicsShanghai UniversityShanghai 200444People's Republic of China Shanghai Creative Superconductor Technologies Co.Ltd. Shanghai 201401People's Republic of China

The second-generation high-temperature superconductor tape(2G-HTS,also known as a coated conductor)based on REBaCuO(REBa_(2)Cu_(3)O_(7-δ))exhibits high current density and potential cost-effective price/performance,compared with conventional superconducting *** commercial 2G-HTS tapes,more than a dozen cable vendors had been manufacturing REBCO cables,such as the latest kilometer-class REBCO cable,which was incorporated into a civil grid on December 2021,as part of the recordbreaking 35-kV-voltage superconductor cable demonstration project in downtown *** paper describes the development of HTS-coated conductors,then outlines the various technological routes for their preparation,reviews the artificial flux pinning of coated conductors,and finally summarizes the technological breakthroughs,the latest research advances,and provides an outlook on their application prospects.

关键词： High-temperature superconductors RE123 superconductor tapes Chemical solution deposition flux pinning

Strong flux pinning enhancement in YBa_2Cu_3O_(7-x) films by embedded BaZrO_3 and BaTiO_3 nanoparticles

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第7期22卷 484-488页

作者：丁发柱古宏伟张腾王洪艳屈飞邱清泉戴少涛彭星煜 Key Laboratory of Applied Superconductivity Chinese Academy of Sciences Institute of Electrical Engineering Chinese Academy of Sciences

YBa2Cu3O7-x （YBCO） films with embedded BaZrO3 and BaTiO3 nanoparticles were fabricated by metalorganic deposition using trifluoroacetates （TFA-MOD）. Both X-ray diffraction and transmission electron microscopy revealed that these BaZrO3 and BaTiO3 nanoparticles had random orientations and were distributed stochastically in the YBCO matrix. The unique combined microstructure enhances the critical current density （Jc） of the BaZrO3/BaTiO3 doped-YBCO films, while keeping the critical transition temperature （Tc） close to that in the pure YBCO films. These results indicate that BaZrO3 and BaTiO3 nanoparticles provide strong flux pinning in YBCO films.

关键词： BaZrO3 and BaTiO3 nanoparticles flux pinning metalorganic deposition using trifluoroacetates

Strongly enhanced flux pinning in the YBa_2Cu_3O_(7-X) films with the co-doping of Ba TiO_3 nanorod and Y_2O_3 nanoparticles at 65 K

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第9期24卷 497-501页

作者：王洪艳丁发柱古宏伟张腾 Key Laboratory of Applied Superconductivity Institute of Electrical EngineeringChinese Academy of Sciences University of Chinese Academy of Sciences

YBa2Cu3O7-x（YBCO） films with co-doping BaTiO3（BTO） and Y2O3 nanostructures were prepared by metal organic deposition using trifluoroacetates（TFA-MOD）. The properties of the BTO/Y2O3co-doped YBCO films with different excess yttrium have been systematically studied by x-ray diffraction（XRD）, Raman spectra, and scanning electron microscope（SEM）. The optimized content of yttrium excess in the BTO/Y2O3co-doped YBCO films is 10 mol.%, and the critical current density is as high as - 17 mA/cm^2（self-field, 65 K） by the magnetic signal. In addition, the Y2Cu2O5 was formed when the content of yttrium excess increases to 24 mol.%, which may result in the deterioration of the superconducting properties and the microstructure. The unique combination of the different types of nanostructures of BTO and Y2O3 in the doped YBCO films, compared with the pure YBCO films and BTO doped YBCO films, enhances the critical current density（JC） not only at the self-magnetic field, but also in the applied magnetic field.

关键词： YBa2Cu3O7-x(YBCO) film flux pinning BaTiO3(BTO) and Y2O3 nanostructures metal organic deposition using trifluoroacetates(TFA-MOD

Nanoengineering of flux pinning Sites in High-T_c Superconductors

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2003年第3期8卷 280-291页

作者： M.R.Koblischka Institute of Experimental Physics University of SaarbryckenP.O.Box 15 11 50D-66041 SaarbruckenGermany

Volume pinning forces were determined for a variety of bulk high-Tc superconductors of the 123-type from magnetization measurements. By means of scaling of the pinning forces, the acting pinning mechanisms in various temperature ranges were identified. The Nd-based superconductors and some YBCO crystals exhibited a dominating pinning of the δTc-type (i.e. , small, superconducting pinning sites). In contrast to this, the addition of insulating 211 particles provided pinning of the δ/-type; providing effective pinning in the entire temperature range acting as a 'background' pinning mechanism for the peak effect. Due to the small coherence lengths of the high-Tc compounds, effective pinning sites are defects or particles of nanometer size relative to ζ3. Integral magnetic measurements of the magnetization as a function of temperature in large applied magnetic fields (up to 7 T) revealed that practically all high-Tc compounds were spatially inhomogeneous, which could be caused by oxygen deficiency (YBCO), solid solutions of Nd/Ba (NdBCO and other light rare earth compounds), intergrowths (Bi-based superconductors), and doping by pair-breaking dopants like Zn, Pr. This implies that the superconducting sample consists of stronger and weaker superconducting areas, coupled together. In large applied fields, this coupling gets broken and the magnetization versus temperature curves revealed more than one superconducting transition. In contrast, irradiation experiments by neutrons, protons, and heavy-ions enabled the artificial introduction of very effective pinning sites into the high-Tc superconductors, thus creating a large variety of different observations using magnetic data. From all these observations, we construct a pinning diagram for bulk high-Tc superconductors explaining many features observed in high-Tc samples.

关键词： flux pinning critical current densities peak effect spatial variations of the transition temperature nanoengineering of pinning sites

Enhancement of flux pinning in GdBa_2Cu_3O_(7-y) bulks prepared by nanoparticle-powder-assisted method

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Transportation 2011年第2期19卷 104-109页

作者： C.H. CHENG Chang Chun HSIEH Chuan KE H. ZHANG C.C. SORRELL Superconductivity Research Group School of Materials Science and Engineering University of New South Wales Sydney 2052 NSW Australia Key Laboratory for Levitation Technology and Maglev Trains Ministry of Education of China Superconductivity and New Energy Center （SNEC） Southwest Jiaotong University Chengdu 610031 China Department of Physics Peking University Beijing 100871 China

High quality GdBa2Cu307-y （Gd123） textured bulks with Nd2BaCuO5 （Nd211） nanoparticle precipitations have been fabricated by a nanoparticle-powders-assisted MTG （melt-textured-growth） technique. The high density nanoscale flux pinning sites were introduced into Gd123 by mixing Nd211 nanoparticle powders （about 20-50 nm） with Gd123 nano-precursors before the MTG process. Microstructural analyses reveal that a large number of Nd211 nanoparticles with a size around 50-150 nm were inserted in the Gd123 matrix, forming a kind of superconducting nanocomposites. The critical current density at 77 K is systematically increased and the flux pinning behavior is significantly improved. The scaling behavior of the flux pinning force shows a magnetic field dependent feature with a peak located at hp≈0.4. This may be the fingerprint of melt-textured 123 compounds, which cannot be interpreted by the simple superposition of different types of elementary pinning sources.

关键词： flux pinning GdBa2Cu307-y nanoparticle-powder assisted processing critical current density

Defect control at nanoscale and flux pinning enhancement in MgB_2 superconductor

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Transportation 2012年第2期20卷 65-69页

作者： C.H.CHENG C.SORRELL School of Materials Science and Engineering University of New South Wale

Defect control at nanoscale of MgB2 by doping various nanoparticles including Ti, C, nano-diamond, and HOB4, and their roles played to enhance flux pinning force in MgB2 are compared and analyzed. These nanodopants have different chemical and physical properties, thus bring about different pinning efficiency, especially nanodopants with strong magnetic moment are particularly interesting as pinning centers in MgB2 since magnetic impurities usually have a stronger interaction with magnetic flux line than nonmagnetic impurities and may exert a stronger force to trap the flux lines when they are properly introduced into the superconducting matrix.

关键词： MgB2 flux pinning nano-pinning centers microstrueture control

Effect of nanometer-sized MgO particles on flux pinning in YBa2Cu307-δ

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 1997年第4期 285-288页

作者： CHEN Qinghu, FANG Minghu, YE Xisheng, JIAO Zhengkuan ZHANG Qirui, WEN Haihu and ZHAO Zhongxian! Physics Department, Zhejiang University, Hangzhou 310027, China 2. State Key Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

As is well known, the relatively low critical current density Jcand the serious flux motion limit a variety of applications of high-temperature superconductors （HTSCs）. The introduction of

关键词： high-T_c superconductor flux pinning YBa2Cu3O7-δ nanometer-sized MgO particles.

Microstructure and properties of MOCVD-derived Gd_xY_(1-x)Ba_2Cu_3O_(7-δ) films with composition fluctuations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2018年第8期37卷 675-681页

作者： Yu-Xi Zhang Fei Zhang Rui-Peng Zhao Yan Xue Hui Wang Qiu-Liang Wang Jie Xiong Bo-Wan Tao State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Applied Research Laboratory of Superconduction and New Material Institute of Electrical EngineeringChinese Academy of Sciences

The effects of Gd content on crystalline orientation, microstructure and superconductivity of GdxYl-x-BazCu3O7-δ（GdYBCO） films were systematically investigated. By varying the Gd content in the liquid precursor without changing the total amount of rare earth elements, series of GdYBCO films with x values of 0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0 were fabricated by metal organic chemical vapor deposition （MOCVD）. X-ray diffraction （XRD） and scanning electron microscope （SEM） analysis revealed that Gd introducing could restrain the formation of CuYOa phase, but induce a-axis growth of GdYBCO film. The increase of x from 0 to 0.5 leads to enhancing critical current density at self-field and 77 K （Jcs0 from 1.8 to 2.8 ***^-2, which benefits from the decrease in CuYO2 impurities and improvement of in-plane texture from 5.0° to 4.3°. However, raising x from 0.5 to 1.0 gives rise to abundant a-axis growth of film and degradation of in-plane texture from 4.3° to 5.4°, consequently resulting in the decrease OfJcsf from 2.8 to 0.8 ***^-2. Even though Jcsf has not varied monotonically, the critical transition temperature of GdYBCO films linearly increases from 90.75 to 92.25 K and the in-field performance at magnetic field （B） of 0-1.1 T and 77 K as well as B parallel to film normal is also superior with Gd content increasing.

关键词： Gd content GdYBCO MOCVD Microstructure flux pinning

Effects of irradiation on superconducting properties of small-grained MgB_(2) thin films

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2023年第12期32卷 534-540页

作者：刘丽 Jung Min Lee Yoonseok Han Jaegu Song Chorong Kim Jaekwon Suk Won Nam Kang 刘杰 Soon-Gil Jung Tuson Park Center for Quantum Materials and Superconductivity(CQMS) Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Physics Sungkyunkwan UniversitySuwon 16419Republic of Korea Institute of Modern Physics Chinese Academy of Sciences(CAS)Lanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of Sciences(UCAS)Beijing 100049China Korea Multi-purpose Accelerator Complex Korea Atomic Energy Research InstituteGyeongjuGyeongbuk 38180Republic of Korea Department of Physics Education Sunchon National UniversitySuncheon 57922Republic of Korea

We investigate the effect of ion irradiation on MgB_(2) thin films with small grains of approximately 122 nm and 140 *** flux pinning by grain boundaries is insignificant in the pristine MgB_(2) films due to good inter-grain connectivity,but is significantly improved after 120-keV Mn-ion *** scaling behavior of the flux pinning force density for the ion-irradiated MgB_(2) thin films with nanoscale grains demonstrates the predominance of pinning by grain boundaries,in contrast to the single-crystalline MgB_(2) films where normal point pinning was dominant after low-energy ion *** results suggest that irradiation-induced defects can accumulate near the grain boundaries in metallic MgB_(2) superconductors.

关键词： MgB_(2)films grain boundaries flux pinning low-energy ion irradiation

Matching effect in superconducting NbN thin film with a square lattice of holes

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第10期18卷 4486-4489页

作者： Muhammad Kamrana 何世坤张伟君曹文会李博宏康琳陈健吴培亨邱祥冈 Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory of Condensed Matter Physics Research Institute of Superconducting Electronics Department of Electronic Science & Engineering Nanjing University

A square hole array is fabricated over a micro-bridge of NbN thin film by electron beam lithography and reactive ion milling. Magneto-resistance is measured across the micro-bridge filled with a hole array near the superconducting transition temperature. It is found that magneto-resistance minima occur when the number of vortices is an integer multiple or a fractional multiple of the number of holes. The temperature and the current dependences of the matching effect are studied.

关键词： flux pinning superconducting thin film matching effect