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Nucleation and epitaxy growth of high-entropy REBa_(2)Cu_(3)O_(7-δ)(RE=Y,Dy,Gd,Sm,Eu)thin films by metal organic deposition

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Journal of Rare Earths 2023年第7期41卷 1091-1098,I0004页

作者： Jing Chen Rongtie Huang Xinghang Zhou Difan Zhou Minjuan Li Chuanyi Bai Zhiyong Liu chuanbing cai Shanghai Key Laboratory of High Temperature Superconductors Physics DepartmentShanghai UniversityShanghai 200444China Shanghai Creative Superconductor Technologies Co. Ltd.Shanghai 201401China

High-entropy REBa_(2)Cu_(3)O_(7-δ)(RE=Y_(0.7)+Dy_(0.2)+Gd_(0.2)+Sm_(0.2)+Eu_(0.2))(HE-REBCO) superconducting films doped with multiple rare earth elements were successfully fabricated with thickness up to 800 nm by a trifluoroacetate-metal organic deposition(TFA-MOD).The enhanced entropy change ΔS of the HEREBCO system promotes the c-axis growth of REBCO thin film in the competition with a/b-axis *** microstructure and element distribution were investigated by the transmission electron microscopy(TEM) and energy dispersive spectroscopy(EDS).The results show that HE-REBCO films have a great amount of stacking defects,lattice distortions and various rare earth ***,the microstrain of HE-REBCO films increases significantly compared to the undoped YBCO and(Y,Dy)BCO ***,the superco nducting critical temperature(T_c^(onset)) of HE-REBCO films is about 93 K,and the in-field properties are significantly improved,especially at the temperature of about 77 *** maximum pinning force density(F_(p,max)) of the HE-REBCO samples at 77 K is 1.7 times higher than that of the undoped YBCO films.

关键词： High-entropy superconductor REBa_(2)Cu_(3)O_(7-δ) Rare earths Trifluoroacetate-metal organic deposition Enhanced entropy change

Research Progress of Electromagnetic Properties of MgB2 Induced by Carbon-Containing Materials Addition and Process Techniques

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Acta Metallurgica Sinica(English Letters) 2020年第4期33卷 471-489页

作者： Jiancheng Li Haobo Liu Ying Li chuanbing cai Shixue Dou Wenxian Li Institute of Materials Laboratory for MicrostructuresSchool of Materials Science and EngineeringShanghai University149 Yanchang RoadShanghai 200072China Institute for Sustainable Energy Shanghai University99 Shangda RoadShanghai 200444China Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia Shanghai Key Laboratory of High Temperature Superconductors 99 Shangda RoadShanghai 200444China

For the high transition temperature(Tc) and low cost taking both raw materials and fabrication process into account,MgB2 has been a competitive candidate to replace the conventional NiTi superconductor for high-temperature application in fault current limiters,transformers,motors,magnetic resonance imaging,adiabatic demagnetization refrigerators,generators,*** carbon-containing materials addition induced high critical current density(Jc) is reviewed based on their influences on the upper critical field(Hc2),flux pinning force,and *** doping effects were compared in the overview focusing on SiC,organic dopants,and graphene-related *** doping is featured for the high-field critical current density,which is caused by the increased Hc2 attributed to the substitution of carbon on boron site and the strong flux pinning force offered by the nanosized secondary phases in the MgB2 *** dopants have the advantage over SiC dopant for their relatively homogeneous distribution in the MgB2 matrix based on wet mixing of the organics and the raw boron *** doping level of two-dimensional materials can improve the superconducting properties in all measured fields because of the combined advantages of carbon substitution effect and grain ***2 fabricated with carbon-encapsulated boron also introduces strong flux pinning centers in MgB2,which show weak destruction of the connectivity of the MgB2 grains as reflected by the low-magnetic-supercurrent ***-pressure treatment and diffusion method can fabricate highdensity MgB2 superconductors with better connectivity and increase the Jc compared with the in situ and ex situ methods.

关键词： Critical current density(J_c) Flux pinning Doping 2D flux pinning centers

Single Buffer Using Perovskite-like RE_2Zr_2O_7 Oxides for High Temperature Superconducting Coated Conductors

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稀有金属材料与工程 2011年第S3期40卷 354-357页

作者： Ying Liliang, Lu Yuming, Liu Zhiyong, Fan Feng, Gao Bo, cai chuanbing Shanghai University, Shanghai 200444, China Shanghai Univ Res Ctr Superconductors & Appl Technol Shanghai 200444 Peoples R China

Single buffer layers of either Gd2Zr2O7 (GZO) or La2Zr2O7 (LZO) with different thickness on highly textured Ni-W tapes were compared with respective to the application of YBa2Cu3O7-δ coated conductors. The superconducting performances are improved as the buffer thickness of GZO or LZO increases up to a critical value, such as 310 and 240 nm, respectively. This suggests that a thin buffer layer is insufficient to prevent the Ni diffusion. If the buffer thickness increases further, the superconducting properties degrade, probably due to changes in the microstructure and degradation of the buffer texture. Comparing with LZO, the texture of GZO is hardly dependent on its thickness, due to smaller mismatch for its lattice with that of Ni-W. For both single buffered coated conductors, the superconducting transition temperatures are around 92 K with a transition width less than 1 K. Inductive measurement reveals that the critical current density (Jc) at 77 K in self-field, reaches 1.2 MA/cm2 and 0.77 MA/cm2 for GZO, and LZO, respectively. This implies that the single buffers of GZO and LZO are comparable to standard buffer architectures such as CeO2/YSZ/Y2O3 or CeO2/LZO, being promising for the process simplification and cost reduction.

关键词： coated conductors single buffer biaxial texture

中能衍射极限环中电阻壁和高频系统阻抗计算与优化

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原子能科学技术 2022年第9期56卷 1821-1831页

作者：王猛张文志田顺强蔡传兵刘新忠上海大学上海市高温超导重点实验室理学院物理系上海200444 中国科学院上海应用物理研究所上海201800 中国科学院上海高等研究院上海201204

在衍射极限环中,由于采用了高梯度小孔径磁铁,真空盒尺寸相对于第3代同步辐射光源大幅减小,全环阻抗明显增大,因此在设计阶段需要对真空元件阻抗进行精准的评估与模型优化。本文计算了中能衍射极限环的多层电阻壁阻抗,针对衍射极限环给... 详细信息

在衍射极限环中,由于采用了高梯度小孔径磁铁,真空盒尺寸相对于第3代同步辐射光源大幅减小,全环阻抗明显增大,因此在设计阶段需要对真空元件阻抗进行精准的评估与模型优化。本文计算了中能衍射极限环的多层电阻壁阻抗,针对衍射极限环给出了优化的电阻壁的材料选择;利用数值模拟程序,完成了对高频腔与三次谐波腔的设计、优化与阻抗计算;分析了由电阻壁阻抗、高频腔和三次谐波腔中的高次模引起的束流不稳定性,并对不稳定性问题提出了抑制方案。

关键词：衍射极限环阻抗壁高频腔三次谐波腔束流集体效应

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YBa_(2)Cu_(3)O_(7-δ)薄膜的BaCl2/BaF2-MOD法制备及超导特性研究

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无机材料学报 2023年第2期38卷 199-204页

作者：陈明月颜志超陈静李敏娟刘志勇蔡传兵上海大学理学院物理系上海市量子与超导新物态前沿科学基地上海市高温超导重点实验室上海200444

传统三氟乙酸金属有机化学溶液沉积法(TFA-MOD)制备YBa_(2)Cu_(3)O_(7-δ)(YBCO)超导层,Ba倾向于与F结合,从而避免BaCO_(3)的形成。本工作开展了新型基于BaCl_(2)/BaF_(2)途径的化学溶液法生长YBCO超导薄膜的研究。重点研究了添加Cl对Y... 详细信息

传统三氟乙酸金属有机化学溶液沉积法(TFA-MOD)制备YBa_(2)Cu_(3)O_(7-δ)(YBCO)超导层,Ba倾向于与F结合,从而避免BaCO_(3)的形成。本工作开展了新型基于BaCl_(2)/BaF_(2)途径的化学溶液法生长YBCO超导薄膜的研究。重点研究了添加Cl对YBCO薄膜晶粒取向、微观结构和超导性能的影响,并通过生长反应的热化学计算,分析了BaCl_(2)途径YBCO薄膜的物相转变机制。结果表明:添加Cl有利于抑制a轴晶粒取向,促进c轴晶粒成核。添加Cl的YBCO双层膜起始转变温度(T_(c-onset))没有明显变化,约为89.6 K,其临界电流密度(J_(c))显著提升,J_(c)达到2.07 MA/cm^(2)(77 K,自场)。此外,生长反应过程的物相转变分析表明Cl优先与Ba结合形成BaCl_(2),有效避免BaCO_(3)的形成。本研究结果表明:添加Cl对制备YBCO超导厚膜有促进作用,这为MOD法制备YBCO提供了一种新思路。

关键词： YBCO薄膜 MOD法 Cl添加物相转变

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倾斜衬底沉积涂层导体MgO缓冲层

低温与超导 2023年第9期51卷 14-20页

作者：韩超瞿天睿高波郭艳群蔡传兵上海大学物理系上海市高温超导重点实验室上海市量子与超导新物态前沿科学基地上海200444

本文通过倾斜衬底沉积技术在Hastelloy基底上成功生长出具有双轴织构的MgO缓冲层。系统研究了衬底倾角分别为30°和55°,薄膜厚度对MgO双轴织构、织构角以及表面形貌的影响。ISD-MgO薄膜最小面内、外半高宽分别为11.0°和6.6°。另外,80... 详细信息

本文通过倾斜衬底沉积技术在Hastelloy基底上成功生长出具有双轴织构的MgO缓冲层。系统研究了衬底倾角分别为30°和55°,薄膜厚度对MgO双轴织构、织构角以及表面形貌的影响。ISD-MgO薄膜最小面内、外半高宽分别为11.0°和6.6°。另外,800℃下,在ISD-MgO上自外延300 nm厚的MgO薄膜可以优化其表面质量,为涂层导体的制备提供高质量缓冲层。

关键词：倾斜衬底沉积氧化镁:双轴织构 Epitaxy-MgO(EPI-MgO)

氧化钇钡铜(YBCO)高温超导带材在超导储能装置的应用

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上海大学学报（自然科学版） 2022年第5期28卷 813-820页

作者：彭思思蔡传兵郑军郭树强徐颖周迪帆上海大学理学院上海200444 武汉船用电力推进装置研究所湖北武汉430064 华中科技大学电气与电子工程学院湖北武汉430074

高温超导磁储能系统具有功率密度大、响应快和寿命长等优势,在新能源电网和新能源电动船舶等领域具有潜在的应用前景.二代高温超导带材具有优越的载流能力、较高的工作温度以及相对较低的制备成本,在超导储能装置得领域到了广泛应用.对... 详细信息

高温超导磁储能系统具有功率密度大、响应快和寿命长等优势,在新能源电网和新能源电动船舶等领域具有潜在的应用前景.二代高温超导带材具有优越的载流能力、较高的工作温度以及相对较低的制备成本,在超导储能装置得领域到了广泛应用.对氧化钇钡铜(YBCO)高温超导带材特性介绍的基础上,分析储能装置对其的性能要求,阐述一代高温超导储能磁体研究现状,并结合10 MJ储能磁体的设计进行具体案例分析.

关键词：超导储能二代高温超导带材 10 MJ储能磁体

MOD-Derived YBa2Cu3O7-δ Thin FilmsUsing a Fast Pyrolysis Process

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MOD-Derived YBa2Cu3O7-δ Thin FilmsUsing a Fast Pyrolysis Pr...

中国材料大会2012

作者： Wenjia Hao Yuming Lu Chuanyi Bai Zhiyong Liu Bo Gao chuanbing cai Research Center for Superconductors and Applied Technologies Shanghai University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences

ISBN: (纸本)9783037856079

In the present work, a fast pyrolysis process is developed for YBa2Cu3O7-δ （YBCO） films preparation with trifluroacetates metalorganic deposition technique （TFA-MOD）. The decomposition of TFA salts as well as the surface morphology of pyrolyzed films is investigated with respect to the pyrolysis temperature and its heating rate. Two typical surface morphologies for the pyrolyzed films, being smooth or buckled, are revealed subjecting to the heating rate and film thickness, which related to the subsequent YBCO films’ property. Smooth and wrinkle-free pyrolyzed films are achieved by using this fast pyrolysis process with a heating rate as high as 5℃/min. The final crystallized YBCO films exhibit good performances with the superconducting transition temperature of 91 K and critical current density of 2.0 MA/cm2 at 77 K, suggesting a rapid, promising MOD route available for scale-up preparation of YBCO coated conductors.

关键词： TFA-MOD YBCO Pyrolysis Wrinkle.

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磁耦合谐振式超导无线输电频率特性

上海大学学报（自然科学版） 2022年第2期28卷 324-332页

作者：代朋韩淑伦周迪帆郭艳群蔡传兵上海大学理学院上海200444

传统无线输电系统在低频条件下的传输效率较低,限制了其在电动汽车、水下潜艇等低频大功率无线输电场景的应用.针对此问题,提出使用高温超导线圈替代铜线圈的解决方案.通过理论分析和实验验证,研究了不同工作频率下超导与铜无线输电系... 详细信息

传统无线输电系统在低频条件下的传输效率较低,限制了其在电动汽车、水下潜艇等低频大功率无线输电场景的应用.针对此问题,提出使用高温超导线圈替代铜线圈的解决方案.通过理论分析和实验验证,研究了不同工作频率下超导与铜无线输电系统的传输特性.结果表明,超导线圈相比于铜线圈具有更低的电阻和更高的品质因数,在低频条件下超导线圈具有独特优势,同时证明了在低频工作的无线输电系统中,使用超导线圈可大幅提升系统的输出功率和传输效率.

关键词：无线电能传输高温超导工作频率输出功率传输效率