共查询到18条相似文献,搜索用时 140 毫秒
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研究了采用单靶控溅射在Si(100)衬底上生长YSZ(钇稳定的ZrO2)BSCCO(铋锶钙铜氧)薄膜的工艺条件,包括生长温度,生长气氛,生长速率及氧化退化等。还研究了高温超导相的形成与生长温度的关系,并获得了超导膜临界温度为82K的BSCCO/YSZ/Si兼容材料。 相似文献
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本文研究了利用YSZ膜作缓冲层Si衬底上溅射BSCCO高温超导薄膜的生长工艺,分析了生长条件对Bscco高温超导相的影响,并提出了YSZ/Si上制备相BSCCO膜的工艺参数。 相似文献
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我们在具有Y稳定的ZrO_2(YSZ)层的蓝宝石上获得高质量的YBa_2Cu_3O_7(YBCO)高温超导薄膜。在零磁场下,77k时,其临界电流密度达到1.6×10 ̄6A/cm ̄2。本文确定了多层膜超导材料的取向关系。YBCO膜的(001)面平行于YSZ过渡层的(100)表面。YSZ层厚为20nm。并且,由于Ba自YBCO层的外扩散,YSZ层含有Ba。尽管蓝宝石与YSZ层间的晶格铅配很大,由于YSZ层具有[100]择优取向,仍能获得准单晶的YBCO薄膜。在YBCO薄膜中,观察到均匀分布的、微小尺寸的Y_2BaCuO_5(211相)沉淀粒子,它们也有利于提高临界电流密度。 相似文献
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本研究采用电子通道技术(ECP)对单晶和双晶外延生长的YBa_2Cu_3O_7(YBCO)超导薄膜的结构、取向和表面完好性作检测,并证实对衬底的预处理可改善外延超导薄膜的质量;还对YBCO/CeO_2/MgO/SrTiO3的双外延薄膜作研究。 相似文献
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本文对溅射高温超导薄膜的过程中所产生的二次溅射效应(Resputter-Effect)作了较系统的理论分析,观察敢YSZ-Si衬底上磁控溅射BSCCO高温超导薄膜时二次溅射效应所产生的影响,并通过采用偏轴溅射代替轴溅射而有效地缓解了该效应。 相似文献
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用低温磁力显微镜观察YBa_2Cu_3O_(7-x)超导薄膜中的涡旋@郑兆佳@袁彩文¥武汉工业大学材料研究与测试中心¥美国德克萨斯大学(奥斯汀)物理系用低温磁力显微镜观察YBa2Cu3O7-x超导薄膜中的涡旋郑兆佳袁彩文AlexdeLozanne(武汉工业... 相似文献
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本文报道了用原子力显微镜(AFM)研究的几种(YBCO)超薄膜的表面结构,这些膜分别生长在SrTiO3(100)基底,和具有厚度为40nm的PrBa2Cu3O7缓冲导的SrTiO3基底上,YBCO超薄膜厚度范围为2.5nm-25nm。在2.5nm厚的单层膜表面观察到了岛状结构,并在7.5nm厚的超薄膜表面首次观察到了台阶高度度不同的三种螺旋位错。同时还讨论了YBCO超薄膜的生长机理。 相似文献
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Ulrich P. Muecke Daniel Beckel Andr Bernard Anja Bieberle‐Hütter Silvio Graf Anna Infortuna Patrik Müller Jennifer L. M. Rupp Julian Schneider Ludwig J. Gauckler 《Advanced functional materials》2008,18(20):3158-3168
Miniaturized solid oxide fuel cells are fabricated on a photostructurable glass ceramic substrate (Foturan) by thin film and micromachining techniques. The anode is a sputtered platinum film and the cathode is made of a spray pyrolysis (SP)‐deposited lanthanum strontium cobalt iron oxide (LSCF), a sputtered platinum film and platinum paste. A single‐layer of yttria‐stabilized zirconia (YSZ) made by pulsed laser deposition (PLD) and a bilayer of PLD–YSZ and SP–YSZ are used as electrolytes. The total thickness of all layers is less than 1 µm and the cell is a free‐standing membrane with a diameter up to 200 µm. The electrolyte resistance and the sum of polarization resistances of the anode and cathode are measured between 400 and 600 °C by impedance spectroscopy and direct current (DC) techniques. The contribution of the electrolyte resistance to the total cell resistance is negligible for all cells. The area‐specific polarization resistance of the electrodes decreases for different cathode materials in the order of Pt paste > sputtered Pt > LSCF. The open circuit voltages (OCVs) of the single‐layer electrolyte cells ranges from 0.91 to 0.56 V at 550 °C. No electronic leakage in the PLD–YSZ electrolyte is found by in‐plane and cross‐plane electrical conductivity measurements and the low OCV is attributed to gas leakage through pinholes in the columnar microstructure of the electrolyte. By using a bilayer electrolyte of PLD–YSZ and SP–YSZ, an OCV of 1.06 V is obtained and the maximum power density reaches 152 mW cm−2 at 550 °C. 相似文献
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Thomas Ryll Henning Galinski Lukas Schlagenhauf Pierre Elser Jennifer L. M. Rupp Anja Bieberle‐Hutter Ludwig J. Gauckler 《Advanced functional materials》2011,21(3):565-572
Agglomerated Pt thin films have been proposed as electrodes for electrochemical devices like micro‐solid oxide fuel cells (μ‐SOFCs) operating at low temperatures. However, comprehensive studies elucidating the interplay between agglomeration state and electrochemical properties are lacking. In this contribution the electrochemical performance of agglomerated and “dense” Pt thin film electrodes on yttria‐stabilized‐zirconia (YSZ) is correlated with their microstructural characteristics. Besides the microscopically measurable triple‐phase‐boundary (tpb) where Pt, YSZ and air are in contact, a considerable contribution of “nanoscopic” tpbs to the electrode conductivity resulting from oxygen permeable grain boundaries is identified. It is demonstrated that “dense” Pt thin films are excellent electrodes provided their grain size and thickness are in the nanometer range. The results disprove the prevailing idea that the performance of Pt thin film electrodes results from microscopic and geometrically measurable tpbs only. 相似文献
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Thomas Ryll Henning Galinski Lukas Schlagenhauf Pierre Elser Jennifer L. M. Rupp Anja Bieberle‐Hutter Ludwig J. Gauckler 《Advanced functional materials》2011,21(3):401-401
Agglomerated Pt thin films have been proposed as electrodes for electrochemical devices like micro‐solid oxide fuel cells (μ‐SOFCs) operating at low temperatures. However, comprehensive studies elucidating the interplay between agglomeration state and electrochemical properties are lacking. In this contribution the electrochemical performance of agglomerated and “dense” Pt thin film electrodes on yttria‐stabilized‐zirconia (YSZ) is correlated with their microstructural characteristics. Besides the microscopically measurable triple‐phase‐boundary (tpb) where Pt, YSZ and air are in contact, a considerable contribution of “nanoscopic” tpbs to the electrode conductivity resulting from oxygen permeable grain boundaries is identified. It is demonstrated that “dense” Pt thin films are excellent electrodes provided their grain size and thickness are in the nanometer range. The results disprove the prevailing idea that the performance of Pt thin film electrodes results from microscopic and geometrically measurable tpbs only. 相似文献
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N. H. Beltrán C. Balocchi X. Errazu R. E. Avila G. Piderit 《Journal of Electronic Materials》1998,27(2):L9-L11
Zirconia (8 mol% yttria) (YSZ) amorphous layers were deposited by spray pyrolysis on Si oxidized substrates and crystallized
by rapid thermal treatment in a home-made halogen lamps furnace. Uniform films were obtained by depositing up to six layers,
followed by the thermal treatment. X-ray analysis showed that the cubic phase is obtained during the initial stage of the
annealing process. No significant differences with increasing annealing time nor interaction between the YSZ film and the
substrate were observed. Ionic conduction in air, with activation energies comparable to those of bulk YSZ ceramics, was observed.
The electrical characteristics of the films make them suitable for microelectronics applications. 相似文献
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《Applied Superconductivity, IEEE Transactions on》2006,16(2):119-122
Many high temperature superconducting (HTS) tape manufactures make an effort to reduce the transport current loss of HTS tapes. The knowledge of critical current and self-field in an HTS tape is very useful to compute the transport current losses. The spatial distribution and magnitude of self-field are variable due to the neighboring materials. In this paper, the critical currents and the transport current losses of BSCCO and YBCO tapes with paralleled magnetic material (Ni tape) and/or diamagnetic material (BSCCO tape) are experimentally investigated to improve the AC loss properties. The critical currents of HTS tapes with paralleled Ni tape are slightly decreased and the transport current losses are markedly increased. However, the critical currents and transport current losses of HTS tapes with paralleled BSCCO tape have not current carrying are more improved than single HTS tape. 相似文献
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Kar S. Kumar R. Konduru P. Datta T. S. 《Applied Superconductivity, IEEE Transactions on》2010,20(1):42-46
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Y. W. Qian J. X. Deng H. Zheng P. Zheng L. Zheng H. B. Qin 《Journal of Electronic Materials》2014,43(11):4289-4293
Ni-Mn-Zn ferrite films were prepared on silicon substrate with CeO2/YSZ (YSZ: yttria-stabilized ZrO2) as buffer layer by pulsed laser deposition. The influence of oxygen pressure on the microstructures and magnetic properties of films were studied. It was shown that the film crystallinity, microstructure and soft magnetic properties were sensitive to the oxygen pressure. High quality film with preferred (311) orientation, uniform surface structure, high purity and excellent soft magnetic properties can be obtained at the oxygen pressure of 1 Pa. The saturation magnetization (M s) is higher than 230 emu/cm3 with a coercivity (H c) smaller than 30Oe, which is suitable to be used in high-frequency devices. 相似文献