Development of High Critical Current YBCO Coated Conductors By Photo-Assisted MOCVD

2000 ◽  
Vol 659 ◽  
Author(s):  
Yimin Chen ◽  
Xin Chen ◽  
Zhongjia Tang ◽  
PenChu Chou ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Critical Current ◽  
Crystal Orientation ◽  
Coated Conductors ◽  
Buffer Layers ◽  
Ybco Films ◽  
Metallic Substrates ◽  
Oxide Substrates ◽  
Nickel Substrates ◽  
Ybco Coated Conductors

ABSTRACTYBa2Cu3O7 (YBCO) films have been deposited by photo-assisted MOCVD at rates of greater than 0.3μm/min on both single crystal oxide substrates and atomically textured metallic substrates. The YBCO films of thickness from 0.5μm to 3μm deposited on LaAlO3 substrates are shown to be highly atomically ordered with Jc> 1 × 106 A/cm2. CeO2 buffer layers have also been developed by photo-assisted MOCVD for the integration of YBCO with metallic substrates. The CeO2 layers were found to be crack-free when grown on nickel even above 1 micron thickness, and exhibited crystal orientation and in-plane alignment similar to that of the atomically textured Ni substrates. YBCO films grown on the thick CeO2 buffer layers on nickel substrates have shown promising results with Jc∼6 × 105 A/cm2.

Experimental Design and Investigation of Novel Pulsed Laser Deposited Structures for YBCO Based Coated Conductors

2013 ◽  
Vol 1579 ◽  
Author(s):  
Francesco Rizzo ◽  
Antonella Mancini ◽  
Angelo Vannozzi ◽  
Andrea Augieri ◽  
Achille Angrisani Armenio ◽  
...  
Keyword(s):  
Single Crystal ◽  
Ybco Film ◽  
Pulsed Laser ◽  
Temperature Stability ◽  
Coated Conductors ◽  
Buffer Layers ◽  
High Quality ◽  
Ybco Films ◽  
Metallic Substrates ◽  
Large Current

ABSTRACTThe study of high quality YBa2Cu3O7-x (YBCO) based superconducting films is a fundamental issue to be addressed when dealing with the realization of efficient coated conductors with large current carrying capacity. In this perspective the investigation of innovative buffer layers structures able to allow epitaxial YBCO film grow on metallic substrates and to prevent contamination and degradation issues holds a central role.In this work we thoroughly study the properties of YBCO films grown by means of pulsed lasers deposition on CeO2 template on both bare MgO single crystal and MgO-homoepitaxial/MgO single crystal substrates. Due to its high chemical and temperature stability the MgO reduces the oxygen diffusion effects. On the other hand, the CeO2 layer, pulsed laser deposited, prevents the YBCO film from metallic contamination and facilitates its epitaxial growth. Morphology and crystalline structure of buffer layers and superconductors film are investigated by using scanning electron microscopy (SEM), X-ray and electrons back-scattered diffraction techniques (XRD and EBSD).YBCO films show good critical temperature values (Tc > 87K) with sharp transitions. These encouraging results make our structures promising candidates in the realization of high quality YBCO based coated conductors.

Fabrication of seed/buffer layers on metallic substrates for YBCO coated conductors

2001 ◽  
Vol 357-360 ◽  
pp. 979-982 ◽  
Author(s):  
SeokBeom Kim ◽  
Toshihiko Maeda ◽  
Yasuji Yamada ◽  
Toshihiro Suga ◽  
Yutaka Yamada ◽  
...  
Keyword(s):  
Coated Conductors ◽  
Buffer Layers ◽  
Metallic Substrates ◽  
Ybco Coated Conductors

Fabrication of High Jc YBa2Cu3O7-δ Coated Conductors Using Sol-Gel Buffer Layers On Nickel and Nickel Alloy Substrates

2001 ◽  
Vol 689 ◽  
Author(s):  
S. Sathyamurthy ◽  
M. Paranthaman ◽  
B. W. Kang ◽  
H. Y. Zhai ◽  
T. Aytug ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Sol Gel ◽  
Rf Sputtering ◽  
Cube Texture ◽  
Dip Coating ◽  
Coated Conductors ◽  
Buffer Layers ◽  
Ybco Films

Sol-gel processing of La2Zr2O7 (LZO) buffer layers on biaxially textured Ni-3 at.% W alloy substrates using a continuous reel-to-reel dip-coating unit has been studied. The epitaxial LZO films obtained have a strong cube texture and uniform microstructure. The effect of increasing the annealing speed on the texture, microstructure and the carbon content retained in the film were studied. On top of the LZO films, epitaxial layers of Yttria Stabilized Zirconia (YSZ) and Ceria (CeO2) were deposited using rf sputtering, and YBa2Cu3Ox (YBCO) films were then deposited using Pulsed Laser Deposition (PLD). A critical current density (Jc) of 1.9 MA/cm2 at 77K and self-field and 0.34 MA/cm2 at 77K and 0.5T have been obtained on these films. These values are comparable to those obtained on YBCO films deposited on all-vacuum deposited buffer layers, and are the highest ever obtained using solution seed layers. The use of all-solution buffers for coated conductor processing has also been explored. A critical current density of 1.1 MA/cm2 at 77 K and self-field was obtained on YBCO films grown be PLD on LZO buffered nickel substrates.

Single buffer layers of LaMnO3 or La0.7Sr0.3MnO3 for the development of Yba2Cu3O7−δ-coated conductors: A comparative study

2002 ◽  
Vol 17 (9) ◽  
pp. 2193-2196 ◽  
Author(s):  
T. Aytug ◽  
M. Paranthaman ◽  
H. H. Zhai ◽  
H. H. Christen ◽  
S. Sathyamurthy ◽  
...  
Keyword(s):  
Superconducting Property ◽  
Pulsed Laser ◽  
Sputter Deposition ◽  
Coated Conductors ◽  
Buffer Layers ◽  
Laser Deposition ◽  
Ybco Films ◽  
Ni Alloy ◽  
Current Densities ◽  
Ybco Coated Conductors

Single, epitaxial buffer layers of insulating LaMnO3 (LMO) or conductive La0.7Sr0.3MnO3 (LSMO) have been grown by sputter deposition on biaxially textured Ni and Ni–alloy substrates. We report baseline investigations of their compatibility with the Yba2Cu3O7−δ (YBCO) coatings and demonstrate biaxially textured YBCO films grown by pulsed-laser deposition on these single-buffered tapes. Superconducting property characterizations revealed better properties for YBCO films on LMO-buffered tapes relative to those grown on LSMO layers. Self-field critical current densities (Jc) exceeding 1 × 106 A/cm2 at 77 K have been obtained for the YBCO (200 nm) films on LMO-buffer layers. These results offer prospects for the use of single, LMO-buffered metal tapes in the development of practical YBCO-coated conductors.

scholarly journals The Influence of Surface Morphology of Buffer Layer on the Critical Current Density in YBCO Coated Conductors

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Jie Xiong ◽  
Yudong Xia ◽  
Fei Zhang ◽  
Yan Xue ◽  
Kai Hu ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Critical Current Density ◽  
Buffer Layer ◽  
Critical Current ◽  
Current Density ◽  
Coated Conductors ◽  
Buffer Layers ◽  
X Ray Diffraction ◽  
Ybco Films ◽  
Surface Morphologies

1 μm-thickYBa2Cu3O7-δ(YBCO) films were grown on the Y2O3/yttria stabilized zirconia (YSZ)/CeO2buffer layers with different surface morphologies using direct-current sputtering. The critical current density (Jc) value of YBCO was 1.1 MA/cm2when the root mean square surface roughness (Rrms) of the buffer layer was 2.5 nm. As theRrmsof the buffer layer increased to 15 nm, theJcdecreased to 0.3 MA/cm2. X-ray diffraction and scanning electron microscopy showed the strong relevance of the evolution of the structure and surface morphologies of YBCO films with the buffer layer of differentRrms. A model was proposed to explain the influence of surface morphology on the superconducting properties of YBCO films.

Pulsed Laser Deposition of Nd-Doped YBa2Cu3O7-x Films for Coated Conductor Applications

1998 ◽  
Vol 526 ◽  
Author(s):  
C. Varanasi ◽  
R.R. Biggers ◽  
I. Maartense ◽  
D. Dempsey ◽  
T.L. Peterson ◽  
...  
Keyword(s):  
Critical Current ◽  
Secondary Ion Mass Spectrometry ◽  
Ac Susceptibility ◽  
Pulsed Laser ◽  
Coated Conductors ◽  
Whole Body ◽  
Ybco Films ◽  
Metallic Substrates ◽  
Secondary Ion ◽  
Pinning Properties

AbstractPulsed-laser ablation was used to deposit YBa2Cu3O7-x (YBCO) films on LaAlO3 and metallic substrates in an effort to understand and develop the processing of coated conductors with enhanced properties. Doping of YBCO films with Nd was utilized as an approach for increasing their flux pinning properties. Separate targets of Nd2O3 and YBCO were used instead of a pre-mixed Nd2O3-YBCO target. The critical current density (Jc) of the films was measured by whole body dc transport measurements and the transition temperature (Tc) by ac susceptibility. The composition vs. depth profiles of the films were obtained by Secondary Ion Mass Spectrometry. The critical current of a 5000 Å thick Nd-doped YBCO film on a LaAlO3 substrate was measured at 77 K and found to be 57 A (Jc = 1.1×106 A/cm2).

Biaxially Textured IBAD-MgO Templates for YBCO-Coated Conductors

MRS Bulletin ◽  
2004 ◽  
Vol 29 (8) ◽  
pp. 543-550 ◽  
Author(s):  
Paul N. Arendt ◽  
Stephen R. Foltyn
Keyword(s):  
Single Crystal ◽  
Generation Y ◽  
Ion Beam ◽  
Coated Conductors ◽  
Ybco Films ◽  
Metal Substrates ◽  
Ion Beam Assisted Deposition ◽  
Current Densities ◽  
Processing Techniques ◽  
Ybco Coated Conductors

AbstractThis article reports on the development of second-generation Y1Ba2Cu3O7–(YBCO)-coated conductors deposited on biaxially textured MgO templates fabricated using ion-beam-assisted deposition (IBAD).The materials system architecture and processing techniques used to achieve high critical supercurrents on flexible superalloy substrates is described.The texturing of YBCO films on metal substrates approaches that of films deposited on single-crystal oxide substrates.Critical currents and critical current densities of YBCO films on metal substrates are also equivalent to YBCO films deposited on single-crystal oxides.

Effect of the Bending Strain on the Inhomogeneity of Critical Current for YBCO Coated Conductors

2016 ◽  
Vol 26 (4) ◽  
pp. 1-4 ◽  
Author(s):  
Yunpeng Zhu ◽  
Liyuan Liu ◽  
Gang Wang ◽  
Xinsheng Yang ◽  
Yong Zhao
Keyword(s):  
Critical Current ◽  
Coated Conductors ◽  
Bending Strain ◽  
Ybco Coated Conductors

YBa2Cu3O7-y−coated conductors with high engineering current density

2000 ◽  
Vol 15 (12) ◽  
pp. 2647-2652 ◽  
Author(s):  
M. Paranthaman ◽  
C. Park ◽  
X. Cui ◽  
A. Goyal ◽  
D. F. Lee ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Critical Current ◽  
Current Density ◽  
Ybco Film ◽  
Pulsed Laser ◽  
Coated Conductors ◽  
Laser Deposition ◽  
Ex Situ ◽  
Layer Sequence ◽  
Ybco Coated Conductors

Short segments of YBa2Cu3O7-y (YBCO) coated conductors were fabricated on rolling-assisted biaxially textured substrates (RABiTS) with a layer sequence of CeO2/YSZ/Ni using an ex situ BaF2 precursor process. Pulsed laser deposition (PLD) was used to deposit both YSZ and CeO2 layers. The YBCO films were grown using e-beam coevaporated Y–BaF2–Cu precursors followed by postannealing. An overall engineering current density, JE, of 28,000 A/cm2 and critical current, Ic, of 147 A/cm width at 77 K were achieved for a 1.6-μm-thick YBCO film. This result demonstrates the possibility of using both the ex situ BaF2 precursor approach and the RABiTS process for producing long lengths of high-JE coated conductors.

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