Current progress in YBCO coated conductors using IBAD MgO template layers

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We present key improvements to growing high quality ({approx}7 degrees {Delta}{phi}) magnesium oxide (MgO) The use of a new layer for IBAD MgO nucleation and reduction in surface roughness of substrates have resulted in better in-plane texture. The processing window for obtaining optimum template texture is very narrow ({approx}10 seconds) using Si,N,. This has been ameliorated by use of an alternate amorphous nucleation layer. The substrate surface roughness has a significant effect on the initial nucleation texture of IBAD MgO films. A surface roughness of -1 nm has resulted in better in-plane texture for IBAD MgO films deposited on metal ... continued below

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1 p.

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Groves, J. R. (James R.); Arendt, P. N. (Paul N.); Foltyn, S. R. (Stephen R.); Jia, Quanxi; Holesinger, T. G. (Terry G.); Emmert, L. A. (Luke A.) et al. January 1, 2002.

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We present key improvements to growing high quality ({approx}7 degrees {Delta}{phi}) magnesium oxide (MgO) The use of a new layer for IBAD MgO nucleation and reduction in surface roughness of substrates have resulted in better in-plane texture. The processing window for obtaining optimum template texture is very narrow ({approx}10 seconds) using Si,N,. This has been ameliorated by use of an alternate amorphous nucleation layer. The substrate surface roughness has a significant effect on the initial nucleation texture of IBAD MgO films. A surface roughness of -1 nm has resulted in better in-plane texture for IBAD MgO films deposited on metal substrates. We have also implemented a method to quantify IBAD MgO texture using reflected high-energy electron diffraction (RHEED). Utilizing this in situ tool, we have been able to refine deposition parameters to routinely grow films in batch mode that have a {Delta}{phi} of {approx} 7 degrees. Deposited meter lengths have had {Delta}{phi} values from 7-9 degrees with 10% uniformity. One to two micrometer thick YBCO films on these templates have had critical current densities in excess of 1 MA/cm2 at 75 K, in self field.

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1 p.

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  • Submitted to: 105th annual meeting and exposition of the American Ceramic Society, Nashville, TN on April 27-30, 2003

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  • Report No.: LA-UR-02-7208
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 976448
  • Archival Resource Key: ark:/67531/metadc932367

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  • January 1, 2002

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 6:27 p.m.

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Groves, J. R. (James R.); Arendt, P. N. (Paul N.); Foltyn, S. R. (Stephen R.); Jia, Quanxi; Holesinger, T. G. (Terry G.); Emmert, L. A. (Luke A.) et al. Current progress in YBCO coated conductors using IBAD MgO template layers, article, January 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc932367/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.