Growth and characterization of conductive SrRuO3 and LaNiO3 multilayers on textured Ni tapes for high-Jc Yba2Cu3O7–delta; coated conductors

2001 ◽  
Vol 16 (9) ◽  
pp. 2661-2669 ◽  
Author(s):  
T. Aytug ◽  
B. W. Kang ◽  
C. Cantoni ◽  
E. D. Specht ◽  
M. Paranthaman ◽  
...  
Keyword(s):  
High Temperature ◽  
Multilayer Structure ◽  
Metal Substrate ◽  
Coated Conductors ◽  
Buffer Layers ◽  
Ybco Films ◽  
Layer Sequence ◽  
Entire Structure ◽  
Electrical Connectivity

Power applications of high-temperature superconducting (HTS) coated conductors will require stabilization against thermal runaway. We have developed conductive buffer layers to electrically couple the HTS layer to the underlying metal substrate. The structure comprises the layer sequence of SrRuO3 (SRO) on LaNiO3 (LNO) on biaxially textured Ni substrates. We report baseline investigations of compatibility of SRO/LNO multilayer structure with processing of Yba2Cu3O7−δ (YBCO) and demonstrate biaxially textured YBCO films on conductively buffered Ni tapes. These YBCO coatings exhibit self-field Jc values as high as 1.3 × 106 A/cm2 at 77 K, and the entire structure (HTS + conductive buffers + metal substrate) shows good electrical connectivity. These results demonstrate that SRO/LNO buffer layers may provide a basis for stabilized coated conductors.

Characterization of suitable buffer layers on Cu and Cu–alloy metal substrates for the development of coated conductors

2004 ◽  
Vol 17 (5) ◽  
pp. S341-S344 ◽  
Author(s):  
C Cantoni ◽  
D K Christen ◽  
E D Specht ◽  
M Varela ◽  
J R Thompson ◽  
...  
Keyword(s):  
Coated Conductors ◽  
Buffer Layers ◽  
Metal Substrates ◽  
Cu Alloy ◽  
Alloy Metal

High Thermal Stability of Mo/Si3N4/Mo/Si3N4/SiO2 Multilayer Solar Selective Coatings

2015 ◽  
Vol 1102 ◽  
pp. 67-71 ◽  
Author(s):  
Rui Hua Yang ◽  
Jin Yang Liu ◽  
Li Mei Lin ◽  
Fa Chun Lai ◽  
Yan Qu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Multilayer Structure ◽  
High Thermal Stability ◽  
Solar Absorptance ◽  
Selective Coating ◽  
Thermal Emittance ◽  
Quartz Substrates ◽  
Thermal Stability Of

In terms of good optical properties and high thermal stability, Mo/Si3N4/Mo/Si3N4/SiO2 coatings based on metal/dielectric multilayer structure were adapted to the solar selective coating at high operating temperatures. The coatings exhibited high solar absorptance in the range of 0.924 ~ 0.936 and low thermal emittance of 0.114 ~ 0.118. The coatings deposited on quartz substrates were thermally stable up to 625 °C in air for 2 h, while they were degraded at 650 °C from the characterization of the absorptance and emittance. The degradation of the coatings was mainly due to the oxidation of molybdenum in air, which was confirmed by Raman spectroscopy. Compared with the thermal stability in air, the coatings were much more stable in vacuum under high temperature. The remarkable thermal stability of the Mo/Si3N4/Mo/Si3N4/SiO2 coatings in air and in vacuum makes them suitable to be applied at high temperature applications.

An evaluation of phase separated, self-assembled LaMnO3-MgO nanocomposite films directly on IBAD-MgO as buffer layers for flux pinning enhancements in YBa2Cu3O7-δ coated conductors

2010 ◽  
Vol 25 (3) ◽  
pp. 437-443 ◽  
Author(s):  
Özgür Polat ◽  
Tolga Aytug ◽  
M. Parans Paranthaman ◽  
Keith J. Leonard ◽  
Andrew R. Lupini ◽  
...  
Keyword(s):  
Flux Pinning ◽  
High Performance ◽  
Superconducting Devices ◽  
Microstructural Characterization ◽  
Coated Conductors ◽  
Buffer Layers ◽  
Nanocomposite Films ◽  
Two Phase ◽  
Ybco Films ◽  
Self Assembled

Technological applications of high temperature superconductors (HTS) require high critical current density, Jc, under operation at high magnetic field strengths. This requires effective flux pinning by introducing artificial defects through creative processing. In this work, we evaluated the feasibility of mixed-phase LaMnO3:MgO (LMO:MgO) films as a potential cap buffer layer for the epitaxial growth and enhanced performance of YBa2Cu3O7-δ (YBCO) films. Such composite films were sputter deposited directly on IBAD-MgO templates (with no additional homo-epitaxial MgO layer) and revealed the formation of two phase-separated, but at the same time vertically aligned, self-assembled composite nanostructures that extend throughout the entire thickness of the film. The YBCO coatings deposited on these nanostructured cap layers showed correlated c-axis pinning and improved in-field Jc performance compared to those of YBCO films fabricated on standard LMO buffers. Microstructural characterization revealed additional extended disorder in the YBCO matrix. The present results demonstrate the feasibility of novel and potentially practical approaches in the pursuit of more efficient, economical, and high performance superconducting devices.

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.

Preparation and Characterization of TiN Seed Layer in All-Conductive Multilayer Structure for Coated Conductors

2013 ◽  
Vol 27 (3) ◽  
pp. 871-875 ◽  
Author(s):  
Yudong Xia ◽  
Jie Xiong ◽  
Xin Zhang ◽  
Kai Hu ◽  
Fei Zhang ◽  
...  
Keyword(s):  
Seed Layer ◽  
Multilayer Structure ◽  
Coated Conductors

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.

Growth and characterization of oxide buffer layers for YBCO coated conductors

1999 ◽  
Vol 9 (2) ◽  
pp. 1527-1530 ◽  
Author(s):  
M.W. Rupich ◽  
W. Palm ◽  
W. Zhang ◽  
E. Siegal ◽  
S. Annavarapu ◽  
...  
Keyword(s):  
Coated Conductors ◽  
Buffer Layers ◽  
Ybco Coated Conductors

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.

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