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Title: Development of Modified MOD-TFA Approach for YBCO Film Growth

Abstract

Low-cost coated-conductor fabrication methods are essential for various electric-power applications. Metal-organic-deposition (MOD) approach to grow both YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) and buffer layers on textured metal substrates is very promising towards fabrication of lower-cost second generation wires. YBCO coated conductors (CC) are being developed with high critical currents that should be sufficient for their extensive use in power applications. However, the present CC has high energy losses in ac magnetic field that are unacceptable. We have developed a modified MOD precursor route to deposit {approx} 0.8 {micro}m thick YBCO films in a single coat that requires less than one-fifth of the pyrolysis time compared to the traditional MOD approach. We have also developed a filamentization technique of CC using ink-jet printing to reduce ac losses due to applied ac fields. The preliminary results of YBCO films deposited on standard RABiTS template yielded an of 140 A/cm at 77 K and self- field. A modest reduction of ac loss was observed for the solution ink-jet printed filamentary conductor.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
OE USDOE - Office of Electric Transmission and Distribution
OSTI Identifier:
931673
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 2006 Applied Superconductivity Conference, Seattle, WA, USA, 20060828, 20060901
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION; AC LOSSES; BUFFERS; CRITICAL CURRENT; ENERGY LOSSES; FABRICATION; MAGNETIC FIELDS; PRECURSOR; PYROLYSIS; SUBSTRATES; SUPERCONDUCTIVITY

Citation Formats

Bhuiyan, Md S, Paranthaman, Mariappan Parans, Sathyamurthy, Srivatsan, Hunt, Rodney Dale, List III, Frederick Alyious, and Duckworth, Robert C. Development of Modified MOD-TFA Approach for YBCO Film Growth. United States: N. p., 2007. Web.
Bhuiyan, Md S, Paranthaman, Mariappan Parans, Sathyamurthy, Srivatsan, Hunt, Rodney Dale, List III, Frederick Alyious, & Duckworth, Robert C. Development of Modified MOD-TFA Approach for YBCO Film Growth. United States.
Bhuiyan, Md S, Paranthaman, Mariappan Parans, Sathyamurthy, Srivatsan, Hunt, Rodney Dale, List III, Frederick Alyious, and Duckworth, Robert C. Mon . "Development of Modified MOD-TFA Approach for YBCO Film Growth". United States. doi:.
@article{osti_931673,
title = {Development of Modified MOD-TFA Approach for YBCO Film Growth},
author = {Bhuiyan, Md S and Paranthaman, Mariappan Parans and Sathyamurthy, Srivatsan and Hunt, Rodney Dale and List III, Frederick Alyious and Duckworth, Robert C},
abstractNote = {Low-cost coated-conductor fabrication methods are essential for various electric-power applications. Metal-organic-deposition (MOD) approach to grow both YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) and buffer layers on textured metal substrates is very promising towards fabrication of lower-cost second generation wires. YBCO coated conductors (CC) are being developed with high critical currents that should be sufficient for their extensive use in power applications. However, the present CC has high energy losses in ac magnetic field that are unacceptable. We have developed a modified MOD precursor route to deposit {approx} 0.8 {micro}m thick YBCO films in a single coat that requires less than one-fifth of the pyrolysis time compared to the traditional MOD approach. We have also developed a filamentization technique of CC using ink-jet printing to reduce ac losses due to applied ac fields. The preliminary results of YBCO films deposited on standard RABiTS template yielded an of 140 A/cm at 77 K and self- field. A modest reduction of ac loss was observed for the solution ink-jet printed filamentary conductor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • RABiTS based metal-organic deposition (MOD) buffer/YBa2Cu3O7-d (YBCO) approach has been considered as one of the potential, low-cost approaches to fabricate high performance second generation coated conductors. The most commonly used RABiTS architectures consisting of a starting template of biaxially textured Ni-W (5 at.%) substrate with a seed layer of Y2O3, a barrier layer of YSZ, and a CeO2 cap. In this three layer architecture, all the buffers are deposited using physical vapor deposition (PVD) techniques. Using these PVD deposited templates, 0.8-{mu}m thick MOD-YBCO films with an Ic (critical current) of 250 A/cm have been achieved routinely in short lengths. Wemore » have developed a low-cost, non-vacuum, MOD process to grow epitaxial buffer layers on textured Ni-5W substrates. The main challenge in this effort is to match the performance of MOD templates to that of PVD templates. We have recently shown that the properties of MOD-La2Zr2O7 (LZO) layers can be improved by inserting a thin Y2O3 seed layer. Using MOD-CeO2 cap layers, we have demonstrated the growth of high performance MOD-YBCO films with an Ic of 200 A/cm-width on MOD-La2Zr2O7/Y2O3/Ni-5W substrates. This approach could potentially decrease the overall cost of the coated conductor fabrication.« less
  • Although pulsed laser deposition (PLD) is one of the most reliable techniques for fabricating YBa{sub 2}Cu{sub 3}O{sub x} (YBCO) thin films with high critical current density (J{sub c}), metal organic decomposition (MOD), including the trifluoroacetate (TFA) process, is attracting more interest because of its potential for scale-up and cost-effectiveness. In general, PLD samples have higher J{sub c} values than those of TFA samples. In this study, we deposited YBCO films on LaAlO{sub 3} single-crystal substrates by TFA and PLD, respectively. Performance of the two samples was compared to investigate possible causes that lead to the different J{sub c} values. In-planemore » and out-of-plane texture was evaluated quantitatively by phi and omega scan, respectively. The FWHMs of phi and omega scans for the TFA sample were comparable to those of the PLD sample, indicating that TFA films follow the substrate texture precisely. Raman spectra were measured to estimate grain connectivity, texture, and second-phase formation. The properties of the samples are almost identical, except for the intensity of the BaCuO{sub 2} Raman peaks. Microstructure observation by SEM showed that TFA films were generally more porous and smaller-grained than PLD samples. Considering these results, the difference in J{sub c} values between TFA and PLD samples (1.3 and 3 MA/cm{sup 2}, respectively) in this experiment is partly attributed to the more porous microstructure of the TFA samples.« less
  • The formation, composition, and propagation of KrF laser-produced plasmas from Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7-x} have been studied with emphasis on topics relevant to film growth by pulsed-laser deposition. Spatially and temporally resolved, high-resolution optical absorption and emission spectroscopy, fast ion probes, and fast photography (obtained with a gated, image-intensified CCD array detector (ICCD)) are employed to investigate both emitting and non-emitting species in the laser plume as well as the overall shape and propagation of the laser plasma in background gases of oxygen and xenon. Transient optical absorption spectroscopy is applied to study the composition of the plume ofmore » ejected material from the dense layer near the target surface to distances of several centimeters. Optical absorption persists long after the decay of plasma fluorescence, indicating a slower component to plume transport. The absorption of YO formed by YBCO ablation in vacuum and by-yttrium ablation in oxygen is presented. Fast electric ion probes are utilized to measure velocities and total collected charge of the positive ions in the expanding YBCO laser plasma from near-threshold, vacuum conditions into the high fluence, background gas conditions utilized for thin-film growth. The exponential attenuation of the positive ion flux transmitted through 50--300 mTorr background oxygen is measured and used to define an attenuation coefficient. The showing of the laser plasma and formation of shock structures due to gas collisions is studied by ion probe measurements and fast ICCD photography. A comparison between shock wave propagation and drag models is presented to describe the arrival time and shape of the ion probe current waveform with distance. 11 refs, 11 figs.« less
  • The Savannah River Site (SRS) tritium facilities have used 1{sup st} generation (Gen1) LaNi{sub 4.25}Al{sub 0.75} (LANA0.75) metal hydride storage beds for tritium absorption, storage, and desorption. The Gen1 design utilizes hot and cold nitrogen supplies to thermally cycle these beds. Second and 3{sup rd} generation (Gen2 and Gen3) storage bed designs include heat conducting foam and divider plates to spatially fix the hydride within the bed. For thermal cycling, the Gen2 and Gen 3 beds utilize internal electric heaters and glovebox atmosphere flow over the bed inside the bed external jacket for cooling. The currently installed Gen1 beds requiremore » replacement due to tritium aging effects on the LANA0.75 material, and cannot be replaced with Gen2 or Gen3 beds due to different designs of these beds. At the end of service life, Gen1 bed desorption efficiencies are limited by the upper temperature of hot nitrogen supply. To increase end-of-life desorption efficiency, the Gen1 bed design was modified, and a Thermal Enhancement Cartridge Heater Modified (TECH Mod) bed was developed. Internal electric cartridge heaters in the new design to improve end-of-life desorption, and also permit in-bed tritium accountability (IBA) calibration measurements to be made without the use of process tritium. Additional enhancements implemented into the TECH Mod design are also discussed.« less