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Title: Effect of CeO{sub 2} buffer layer thickness on the structures and properties of YBCO coated conductors.

Abstract

Biaxially textured YBa{sub 2}Cu{sub 3}O{sub 7-x} (YBCO) films were grown on inclined-substrate-deposited (ISD) MgO-textured metal substrates by pulsed laser deposition. CeO{sub 2} was deposited as a buffer layer prior to YBCO growth. CeO{sub 2} layers of different thickness were prepared to evaluate the thickness dependence of the YBCO films. The biaxial alignment features of the films were examined by X-ray diffraction 2{theta}-scans, pole-figure, {phi}-scans and rocking curves of {Omega} angles. The significant influence of the CeO{sub 2} thickness on the structure and properties of the YBCO films were demonstrated and the optimal thickness was found to be about 10 nm. High values of T{sub c} = 91 K and J{sub c} = 5.5 x 10{sup 5} A/cm{sup 2} were obtained on YBCO films with optimal CeO{sub 2} thickness at 77 K in zero field. The possible mechanisms responsible for the dependence of the structure and the properties of the YBCO films on the thickness of the CeO{sub 2} buffer layers are discussed.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Scientific Research Foundation for the Returned Overseas Chinese Scholars
OSTI Identifier:
952939
Report Number(s):
ANL/ES/JA-64329
Journal ID: ISSN 0169-4332; ASUSEE; TRN: US200914%%82
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Appl. Surf. Sci.; Journal Volume: 253; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; CERIUM OXIDES; BUFFERS; DEPOSITION; THICKNESS; YTTRIUM OXIDES; BARIUM OXIDES; COPPER OXIDES; COATINGS; FILMS; TRANSITION TEMPERATURE; MORPHOLOGY

Citation Formats

Li, M., Zhao, X., Ma, B., Dorris, S. E., Balachandran, U., Maroni, V. A., and Wuhan Univ. Effect of CeO{sub 2} buffer layer thickness on the structures and properties of YBCO coated conductors.. United States: N. p., 2007. Web. doi:10.1016/j.apsusc.2007.02.186.
Li, M., Zhao, X., Ma, B., Dorris, S. E., Balachandran, U., Maroni, V. A., & Wuhan Univ. Effect of CeO{sub 2} buffer layer thickness on the structures and properties of YBCO coated conductors.. United States. doi:10.1016/j.apsusc.2007.02.186.
Li, M., Zhao, X., Ma, B., Dorris, S. E., Balachandran, U., Maroni, V. A., and Wuhan Univ. Mon . "Effect of CeO{sub 2} buffer layer thickness on the structures and properties of YBCO coated conductors.". United States. doi:10.1016/j.apsusc.2007.02.186.
@article{osti_952939,
title = {Effect of CeO{sub 2} buffer layer thickness on the structures and properties of YBCO coated conductors.},
author = {Li, M. and Zhao, X. and Ma, B. and Dorris, S. E. and Balachandran, U. and Maroni, V. A. and Wuhan Univ.},
abstractNote = {Biaxially textured YBa{sub 2}Cu{sub 3}O{sub 7-x} (YBCO) films were grown on inclined-substrate-deposited (ISD) MgO-textured metal substrates by pulsed laser deposition. CeO{sub 2} was deposited as a buffer layer prior to YBCO growth. CeO{sub 2} layers of different thickness were prepared to evaluate the thickness dependence of the YBCO films. The biaxial alignment features of the films were examined by X-ray diffraction 2{theta}-scans, pole-figure, {phi}-scans and rocking curves of {Omega} angles. The significant influence of the CeO{sub 2} thickness on the structure and properties of the YBCO films were demonstrated and the optimal thickness was found to be about 10 nm. High values of T{sub c} = 91 K and J{sub c} = 5.5 x 10{sup 5} A/cm{sup 2} were obtained on YBCO films with optimal CeO{sub 2} thickness at 77 K in zero field. The possible mechanisms responsible for the dependence of the structure and the properties of the YBCO films on the thickness of the CeO{sub 2} buffer layers are discussed.},
doi = {10.1016/j.apsusc.2007.02.186},
journal = {Appl. Surf. Sci.},
number = 2007,
volume = 253,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • The overall purpose of this research is to develop a potentially low-cost, high throughput, high yield, manufacturing process for buffer deposition, and to gain a fundamental understanding of buffer layers required for an all metal-organic deposition (MOD) based chemical solution approach. This understanding is critical to the development of a reliable, robust, low-cost, long-length manufacturing process of 2G wires. The standard RABiTS architectures consists of a starting template of biaxially textured Ni-W (5 at.%) substrate with a seed layer of Y{sub 2}O{sub 3}, a barrier layer of YSZ, and a CeO{sub 2} cap. In this three-layer architecture, all the buffersmore » are deposited using reactive sputtering. We have recently demonstrated that the barrier properties and the performance of MOD La{sub 2}Zr{sub 2}O{sub 7} (LZO) match that of sputtered YSZ layers. In this work, the texture of MOD LZO was also improved by inserting a sputtered Y{sub 2}O{sub 3} seed layer on which LZO grows without any degradation of texture. Significant improvement in the texture of sputtered Y{sub 2}O{sub 3} seeds on NiW substrates is usually observed which is then transferred to the LZO layer. A key challenge for an all-solution approach is to replace the sputtered seed layer with a possible MOD seed layer with improved texture and on which no degradation of LZO texture occurs. Very recently, we have grown MOD La{sub 3}TaO{sub 7} (LTO) seeds directly on biaxially textured Ni-W (3 at.%) with improved texture. In this study, we report a systematic investigation of the growth MOD LZO barrier layer on MOD LTO seeds. Preliminary results show that it is possible to grow MOD LZO with improved texture on MOD LTO seeds. This approach could be potentially used for future all MOD buffer/YBCO coated conductors.« less
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  • Coated conductor applications in power technologies require stabilization of the high-temperature superconducting (HTS) layers against thermal runaway. Conductive La 0.7Sr 0.3MnO 3 (LSMO) has been epitaxially grown on biaxially textured Ni substrates as a single buffer layer. The subsequent epitaxial growth of YBa 2Cu 3O 7-δ (YBCO) coatings by pulsed laser deposition yielded self-field critical current densities (J c) of 0.5×10 6 A/cm 2 at 77 K, and provided good electrical connectivity over the entire structure (HTS+conductive-buffer+metal substrate). Property characterizations of YBCO/LSMO/Ni architecture revealed excellent crystallographic and morphological properties. These results have demonstrated that LSMO, used as a single, conductivemore » buffer layer, may offer potential for use in fully stabilized YBCO coated conductors. © 2001 American Institute of Physics.« less
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