用于制备YBCO薄膜的光辅助MOCVD反应器内流动现象的数值研究

对一种制备YBCO薄膜的光辅助MOCVD反应器内的流动现象进行了三维数值模拟研究.在模拟计算中,分别改变基座与进口的相对角度(Φ)、反应器顶壁倾斜角度(Ψ),得出反应器中流场的相应变化.根据对模拟结果的分析,发现当基座平面与进气口轴线之间的夹角Φ=22.5°及反应器顶壁倾角ψ=30°时,基片表面气流速度大小合适,分布均...     

Influence of Irradiation-Induced Correlated and Random Disorder on Flux Pinning in Bulk YBCO Melt-Textured Samples

YBCO melt textured samples were studied after Au ion irradiation of two opposite surface layers of the samples and after proton irradiation. The scaling behavior of the pinning force was studied in order to get information about mechanisms responsible for pinning in the studied samples. Correlated disorder introduced bysurface ion irradiation is effective at high reduced temperatures and leads to the occurrence of a kink in the irreversibility line and to the shift of this line toward higher fields and temperatures. Enhancement of critical current density,increasing with temperature and field, was observed. Random disorder due to proton irradiation does not change the irreversibility line and only provides critical current enhancementdecreasing with temperature and field.     

Improved barium fluoride process YBa2Cu3)7-x films via post-anneal monitoring

The continuous monitoring of the conversion, of Y, Cu and BaF₂ precursors to form superconductor thin films has been achieved using a fluorine-specific-ion electrode immersed in an effluent gas-washing cell. High-quality thin films of YBa₂Cu₃O_7-x deposited on NdGaO₃, LaA10₃ and LaGaO₃, have been produced by limiting the wet oxygen annealing phase of the post-deposition anneal. When the films were over-annealed in humidified oxygen the superconducting transition temperature as measured by inductive methods and the crystal quality, determined by x-ray rocking curves were degraded.     

TEM Analysis on YBCO Composited Superconducting Tapes

The microstructures of the YBCO composited superconducting tapes with different J_c were analysed byTEM.The relationship between microstructure and J_c of the tapes is discussed in detail.It is demonstrated thatJ_c value of the tapes increases significantly with the decrease in the width of grain boundary,increase of the twindensity and the reducing of the amount of precipitates at grain boundary.At grain boundary of the tapes,howev-er,small amount of non-superconducting phases can-not be avoided.For the fabrication of high J_c YBCO com-posited tapes,it is very important to improve the microstructure of the superconductor perfectly.     

YBCO／STO超导外延膜的X－射线双晶衍射研究

应用Ｘ－射线双晶衍射对磁控溅射法制备的ＹＢａ_２Ｃｕ_３Ｏ_（７－ｘ）／ＳｒＴｉＯ_３超导外延膜和衬底之间的位向关系以及晶体完整性的研究，表明衬底和外延在相应的衍射面之间存在与两者点阵常数差无关的位向差。这种位向差与测量方向（φ角）有关，在孪晶界方向出现极值。外延摇摆曲线的半峰宽值显示外延完整性较差，其值与测量方向有关，而不同方向上的点阵常数变化却不大。这可能分别与孪晶存在和孪晶有择优取向以及外延镶嵌块间夹角变化有关。     

The use of nanophase powders for high Jc superconductor tape production

Advances in processing of superconductors has demonstrated that ceramic powders with exact composition, super-homogeneity, and extremely fine particle size can be prepared by chemical processing to achieve high density and uniform microstructure. The chemical processing routes have great advantage in preparing powder with high reactivity thus promoting solid state reactions required to produce ‘purer’ superconducting phase. We have studied extensively the coprecipitation technique for the preparation of superconducting ceramic powders. Chemical solution methods have been used in order to model several superconducting systems and to predict optimum conditions for obtaining exact composition. Several improvements on the control of precipitation reaction have been implemented in order to obtain powders of few nanometers in size. This has been done by carrying out the reaction in the bulk of a solution or in microemlusion systems. The corecipitated precursor powder has been used for production of 20− 30 meter long Ag-clad tapes. These tapes require considerably reduced processing times. By controlled heat treatment conditions, these tapes have been processed to carry transport critical current density, J_c <4 × 10⁴ A/cm² at 77K in zero applied field.     

Phase separation in hydrogen-loaded 123 and 124 compounds observed by Cu NMR and NQR

The transition from superconducting to antiferromagnetic behavior in RE Ba₂Cu₃O₇H_x, RE=Y, Gd, has been studied by Cu NMR and NQR. In the Gd compounds the spectra of Cu(1) and Cu(2) sites could be separated by the strong relaxation induced by the magnetic moments of Gd on the neighboring Cu(2) sites. Already at smallx of about 0.4, antiferromagnetic Cu(2) sites are revealed by an AF-NMR spectrum. At the samex we find a strong broadening of the normal NQR spectrum and a new sharp line at 27 MHz for⁶³Cu, indicating a new EFG of the Cu(1) sites in the AF phase. The transformation to the AF state is complete at aboutx=2.0. Annealing of the doped material at 350 °C leads to the normal oxygen-depleted 123 compounds, proving that the cation lattice is not distorted even at highx. As in the case of the pure YBCO, no static magnetic moments exist at the Cu(1) sites of the hydrogen-containing phase. Hydrogen addition is found to produce a similar antiferromagnetic spectrum in 124 material.     

应用高温超导线(带)的研制现状与进展

提供了当前高温超导线的最新发展,第一代高温超导材料的机电性能参数和热物性参数,以及4种美国超导公司的商业产品和中国超导带材的基本参数.论述了第二代高温超导线的研究进展.从高温超导电力应用的观点,展望高温超导电力技术应用前景,文中的工程与实验数据对高温超导线(带)材的应用可供参考.     

Synthesis and properties of YBa2Cu3O7-δ – Y2Ba4CuWO10.8 superconducting composites

YBa₂Cu₃O_7-δ (YBCO) is a well-known high-temperature superconductor. However, its critical current density and thus maximum trapped magnetic field can be improved significantly by introducing the secondary phases (artificial pinning centers). In this contribution, we successfully prepared YBCO single-grain bulks with Y₂Ba₄CuWO_10.8 phase serving as a source of pinning centers. This phase was prepared by solid-state reaction and further refined by milling. In the next step single-grain YBCO bulks with homogeneously distributed Y₂Ba₄CuWO_10.8 were prepared by top-seeded melt growth. Precursors as well as the final product were characterized by XRD, SEM and EDS. The phase composition of YBCO bulks containing Y₂Ba₄CuWO_10.8 was analyzed using Rietveld analysis. Thermal stability of YBCO bulk was studied by STA. Furthermore, PPMS was used to study electrical resistivity and critical current density. Bulk superconducting properties such as levitation force and trapped field ability were also measured.