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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

Machine Learning towards Screening Solid-state Lithium Ion conductors

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Chinese Journal of Structural Chemistry 2020年第1期39卷 8-10,1页

作者： LU Yang CHEN Xiang ZHAO Chen-Zi ZHANG Qiang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Machine learning is an emerging method to discover new materials with specific *** unsupervised machine learning research is highlighted to discover new potential lithium ionic conductors by screening and clustering l... 详细信息

关键词： unsupervised machine learning first principles calculation solid state lithium ion conductors anion frameworks high ionic conductivities

Preparation of YBCO Coated conductors on RABiTS Substrate with Advanced TFA-MOD Method

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稀有金属材料与工程 2011年第S3期40卷 342-345页

作者： Zhao Xiaohui, Gao Chang, Xia Yudong, Zhang Fei, Tao Bowan State Key Laboratory of Electronic Thin Film and Integrated Devices,University of Electronic Science and Technology of China, Chengdu 610054, China Univ Elect Sci & Technol China State Key Lab Elect Thin Film & Integrated Device Chengdu 610054 Peoples R China

YBCO high temperature coated conductors are the most promising candidate for large scale superconducting transmission cables and fault current limiters. A modified TFA-MOD method was applied to prepare YBCO layer on Rolling Assisted Biaxially Textured Substrate (RABiTS) with textured Y 2 O 3 /YSZ/CeO 2 buffer layers, resulting in reduced time and cost of fabrication. By using Cu naphthenate instead of Cu(TFA) 2 , the pyrolysis time of the YBCO precursors was reduced significantly. YBCO films with thickness of 2 μm were fabricated with multiple-coating and annealed at high temperature for 2 h. X-ray diffraction analysis revealed that the films were c-axis oriented. The preliminary results of YBCO films yielded 0.2 MA/cm 2 at 77 K and self field. It is believed current carrying ability of YBCO films could be further improved by reducing the reaction rate at the interface between the buffer layer and superconducting layer.

关键词： TFA-MOD coated conductors RABiTS YBCO

Externalized conductors and insulation failure in Biotronik defibrillator leads: History repeating or a false alarm?

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World Journal of Clinical Cases 2017年第2期5卷 27-34页

作者： Elia De Maria Ambra Borghi Lorenzo Bonetti Pier Luigi Fontana Stefano Cappelli Cardiology Unit Ramazzini Hospital

Conductor externalization and insulation failure are frequent complications with the recalled St. Jude Medical Riata implantable cardioverter-defibrillator(ICD) leads. Conductor externalization is a "unique" failure mechanism: Cables externalize through the insulation("inside-out" abrasion) and appear outside the lead body. Recently, single reports described a similar failure also for Biotronik leads. Moreover, some studies reported a high rate of electrical dysfunction(not only insulation failure) with Biotronik Linox leads and a reduced survival rate in comparison with the competitors. In this paper we describe the case of a patient with a Biotronik Kentrox ICD lead presenting with signs of insulation failure and conductor externalization at fluoroscopy. Due to the high risk of extraction we decided to implant a new lead, abandoning the damaged one; lead reimplant was uneventful. Subsequently, we review currently available literature about Biotronik Kentrox and Linox ICD lead failure and in particular externalized conductors. Some single-center studies and a nonprospective registry reported a survival rate between 88% and 91% at 5 years for Linox leads, significantly worse than that of other manufacturers. However, the preliminary results of two ongoing multicenter, prospective registries(GALAXY and CELESTIAL) showed 96% survival rate at 5 years after implant, well within industry standards. Ongoing data collection is needed to confirm longer-term performance of this family of ICD leads.

关键词： Implantable cardioverter defibrillator Biotronik implantable cardioverter defibrillator lead Externalized conductors Insulation failure

LITHIUM IONIC conductors OF Rc STRUCTURE

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Chinese Science Bulletin 1991年第10期36卷 793-799页

作者：李世椿 Shanghai Institute of Ceramics Academia Sinica Shanghai 200050 PRC

Due to its low electronegativity and light weight, if lithium is used as negative electrode material for electrochemical devices, the cell voltage and energy density may be enhanced. In recent years, the search for a new lithium conductor increased obviously with the increasing interest in all solid state lithium cell. LISICON is a three-dimensional lithium conductor with high conductivity, but its chemical stability is not good, and its conductivity at room temper-

关键词： lithium ionic conductors solid solution conductivity.

Analyzing an UWB Bandpass Filter for High Power Applications Using Rectangular Coaxial Cables with Square Inner conductors

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Circuits and Systems 2011年第3期2卷 121-126页

作者： Nasreddine Benahmed Nadia Benabdallah Salima Seghier Fethi Tarik Bendimerad Boumedienne Benyoucef 不详

Using the finite element method (FEM) in two dimensions and the CST MICROWAVE STUDIO? (CST MWS) Transient Solver, the electromagnetic (EM) analysis and the design of a novel compact ultra wideband (UWB) bandpass filter using rectangular coaxial cables with square inner conductors, convenient for high power applications, are presented. The design of the UWB BP filter is based on the use of impedance steps and coupled-line sections. The center frequency around 6.85 GHz was selected, the bandwidth is between 3-10 GHz, the insertion-loss amounts to around 0.35 dB and the return loss is found higher than 10 dB in a large frequency range (4-9.5) GHz. The simulated results of stopband performances are better than 15 dB for a frequency range up to 11 GHz. For the selected center frequency and on a substrate with a dielectric constant of 2.03, the rectangular coaxial cables BPF with square inner conductors is only 6.7 × 8.9 × 33.4 mm in size.

关键词： Rectangular Coaxial Cables Square Inner conductors Ultra Wideband Bandpass Filter Compact Filter Electromagnetic Parameters Analysis and Design FEM Method CST MWS Transient Solver

A Wideband High-Gain Sawtooth Slot Array Antenna with Frequency-Scanning at Lower Frequency and Fixed-Beam at Higher Frequency

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Chinese Journal of Electronics 2024年第2期33卷 463-471页

作者： Qiang SUN Yongling BAN Jun HU School of Electronic Science and Engineering University of Electronic Science and Technology of China

Exploring the multifunctional array antenna suitable for complex communication environment has very important research value. In this paper, a millimeter wave(mm-wave) double longitudinal sawtooth slot array antenna(DLSA) based on substrate integrated waveguide(SIW) technology is proposed, which has wideband, highgain and novel beam characteristics. Two irregular longitudinal slots are etched on the SIW conductor surface as the radiation structure. To improve the bandwidth of the DLSA, the metallized vias are added at the transition point of the slots to construct multiple resonant frequency points. By adjusting the size of the slots and the position of the metallized vias, the phase constant can be regulated, and the unusual beam characteristics can be obtained. That is to say, in the lower frequency band, the beam pointing angle increases with frequency. In the higher frequency band,the beam pointing angle is maintained at a fixed angle. Finally, to improve the antenna gain, a 16 × 8 DLSA is fabricated, measured and discussed. The proposed antenna has an impedance matching bandwidth close to 9.7 *** 27 to 33 GHz, the beam pointing angle changes from 8° to 29°. From 33 to 37 GHz, the beam pointing angle is fixed at 29°, and the pointing angle error range is ±1°. In addition, the measured maximum gain is 22.9 d Bi at32 GHz.

关键词： Antenna measurements Slot antennas Surface waves Resonant frequency Gain measurement conductors Frequency measurement

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Metal Organic Deposition of Lanthanum Zirconate Buffer Layer on Biaxially Textured Ni-5%W Substrate

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稀有金属材料与工程 2011年第S3期40卷 306-310页

作者： Guo Pei, Zhao Xiaohui, Xiong Jie, Xia Yudong, Jing Tongguo, Chen Jue,Zhang Ning, Zhang Fei, Tao Bowan, Li Yanrong State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu,610054,China Univ Elect Sci & Technol China State Key Lab Elect Thin Films & Integrated Devic Chengdu 610054 Peoples R China

In this study,a simple template consisted of Y2O3 and La2Zr2O7 (LZO) layers was fabricated on rolling assisted biaxially textured Ni-5at%W substrates for YBa2Cu3O7-δ (YBCO) coated conductors.A thin sputtered Y2O3 layer (～20 nm) was introduced as a seed layer in order to induce epitaxial growth of metal organic deposited LZO *** effects of Y2O3 layer,annealing temperature and dwelling time on the phase and texture of the LZO films were systematically investigated.X-ray diffraction exhibited that the LZO films were purely c-axis-oriented with full width at half maximum value of out-of-plane and in-plane less than 4° and 6° *** force microscope analysis indicated the surface of such films was smooth,dense and crack-free.1.2μm-thick YBCO films were prepared directly on this 2-layer template with a critical current density of 0.58 MA/cm2 at 77 K and self field and Ic value of 70 A/cm-width,indicating a combination of LZO/Y2O3 is a promising buffer architecture for low cost production of high performance coated conductors.

关键词： La2Zr2O7 buffer layer MOD YBCO coated conductors

基于铜纳米材料及其组装的柔性电子技术（英文）

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Science China Materials 2019年第11期62卷 1679-1708页

作者：冯阳朱剑 School of Materials Science and Engineering Nankai UniversityTianjin 300350China National Institute for Advanced Materials Nankai UniversityTianjin 300350China Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry Nankai UniversityTianjin 300350China Tianjin Key Laboratory for Rare Earth Materials and Applications Nankai UniversityTianjin 300350China

柔性电子在可穿戴和生物植入等应用中发挥着越来越重要的作用.柔性电子在实现一定电子功能的同时,具备变形成任意形状的能力.该领域在过去的十年里进展显著,在柔性导体、半导体、介电材料的制备中成果颇多.在这些材料中,铜基柔性导体由... 详细信息

柔性电子在可穿戴和生物植入等应用中发挥着越来越重要的作用.柔性电子在实现一定电子功能的同时,具备变形成任意形状的能力.该领域在过去的十年里进展显著,在柔性导体、半导体、介电材料的制备中成果颇多.在这些材料中,铜基柔性导体由于其价格低廉,地球储量丰富,光、电、机械性能优异,在柔性、可拉伸电极或者电路互连中有着广阔的应用前景.在这篇综述中,我们总结了这些材料的最新进展,详细讨论了铜纳米材料的合成、组装、抗氧化腐蚀策略以及它们在各个领域的应用(如柔性电极、传感器和其他柔性器件).最后,我们讨论了铜基柔性导体为应对更广泛的应用场景仍需面临的一系列挑战.

关键词： copper nanomaterials assemblies composites stretchable conductors soft electronics