Fabrication of High Current YBa<sub>2</sub>Cu<sub>3</sub>O(sub>7-y</sub>) Coated Conductors Using Rolling-Assisted Biaxially Textured Substrates Page: 1 of 8
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Symposium VI - Scicnce and Engineering of HTC Superconductivity
P. Vincenzini (Editor r0 Tcchna SrL 1999 I
FABRICATION OF HIGH CURRENT YBa2Cu1O7-y COATED CONDUCTORS USMG
ROLLING-ASSISTED BIAXIALLY TEXTURED SUBSTRATES
M. PARANTHAMAN, F. A. LIST, D. F. LEE, A. GOYAL, R. FEENSTRA, D. P. NORTON,
C. PARK, D. T. VEREBELYL, D. K. CHRISTEN, P. M. MARTIN. E. D. SPECHT, and D. M.
Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
High critical current YBa2Cu307.y (referred to as YBCO) coated conductors were fabricated
with a layer sequence of YBCQ/YSZ/CeOJ/Ni. The cube (100) texture in the starting Ni
substrates was obtained by cold rolling followed by recrystallization. A thin CeO2 (Cerium
Oxide) layer with a thickness of 100-200 A was grown epitaxially on the biaxially textured-Ni,
substrates using an e-beam evaporation technique. This was followed by the growth of a thick
(S 0.77 pm) YSZ (Yttria Stabilized Zirconia) layer using either e-beam evaporation or rf
magnetron sputtering. The e-beam CeO2 film had a dense microstructure. The microstructure
of the e-beam YSZ film was porous whereas the sputtered YSZ film was dense. The YBCO
films were grown by pulsed laser deposition on both e-beam and sputtered YSZ layers. A
transport critical current density of- I x 106 A/cm' at 77 K was obtained for - 0.8 Am thick
YBCO films on both YSZ surfaces in zero field. To demonstrate the quality and compatibility
of the e-beam CeO2 layers; YBCO films were also grown on CeO2-buffered YSZ (100) single
crystal substrates using e-beam co-evaporated Y-BaF-Cu precursors followed by a post-
annealing process. A transport critical current density of over 1 x 10'A/cm2 at 77 K was
obtained on a - 0.3 pm thick YBCC film in zero field.
For the development of coated conductors for high temperature (77 K), and high field
applications, biaxially textured YBaZCu307.7 (referred to as YBCO) deposits have emerged as one
of the leading candidates. Three approaches have been used to fabricate biaxially textured YBCO
films. The first approach was to grow biaxially textured Yttria Stabilized Zirconia (YSZ) buffer
layers on polycrystalline substrates including Ni-alloys such as Haynes 230 and Hastelloy C276
through an ion-beam assisted deposition (IBAD) process.'4 A high Je of over 1 x 104 A/cm2 at 75
K and zero field was obtained The second approach was to use the Inclined Substrate
Deposition (ISD) technique where textured YSZ deposits were made using pulsed laser
Research was sponsored by the Division of Materials Sciences, Office of Basic Energy Sciences
and Office of Energy Efficiency and Renewable Energy, Office of Utility Technologies-
Superconductivity Program, performed at Oak Ridge National Laboratory managed by Lockheed
Martin Energy Research Corporation for the U.S. Department of Energy under contract # DE-
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Christen, D.K.; Feenstra, R.; Kroeger, D.M.; Lee, D.F.; List, F.A.; Martin, P.M. et al. Fabrication of High Current YBa<sub>2</sub>Cu<sub>3</sub>O(sub>7-y</sub>) Coated Conductors Using Rolling-Assisted Biaxially Textured Substrates, article, June 1, 1999; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc794529/m1/1/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.