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: 4 of 8
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3. RESULTS AND DISCUSSION
The e-beam and sputtered buffer layer characteristics, and transport property measurements of
the YBCO films are discussed below.
3.1. E-beam evaporated CeO2 and YSZ layers
The XRD results from the 0-29 scan, and also from o and 0 scans for 1000 A thick YSZ
deposited on 200 A thick CeOz-buffered Ni substrates revealed good epitaxial texturing. The
FWHM for Ni (002), CeO2 (002). and YSZ (002) were 7.4". 6.6". and 6.8". and that of Ni (202).
CeO2 (202), and YSZ (202) were 9.50, 8.80, and 8.5w, respectively. The CeO2 (111) and YSZ
(202) pole figures also demonstrated that the buffer layers were epitaxial with a single orientation.
SEM micrographs indicated that the 200 A thick Ce02 layers were smooth, dense, and
columnar." On the other hand, the e-beam YSZ layers were porous and columnar." The porous
microstructure of the e-beam YSZ layers could be due to the evaporation from an oxide source. It.
may be possible to change the microstructure by depositing YSZ at higher temperatures or by
evaporating the respective metal sources. The CeO2 and YSZ layers were crack-free. There
seems to be thickness dependence with respect to crack formation in CeO2 layers on Ni
substrates. For example, thick (> 2000 A) CeO2 films typically were cracked.
The 6-20 scans on the thick YBCO film deposited on all e-beam YSZ/CeO2/Ni substrates
showed c-axis alignment. These films were 0.3 cm wide and I cm long. The 0 scan for a 0.76
pm thick YBCO film on the RABiT substrate is shown in Figure 1. It shows good in-plane
=S 0 13 30 4 60 71 90 1 e 2 (e- earm)
6000 l lo A
Ni (rolled & annealed)
The scans for a 0.76 gm thick YBCO deposited on 1400 A thick YSZ-buffered Ni substrates.
Y 123 (103) 9.7 FWHM
YSZ (202) 11.80 FWHM
9.0 x Id A/cm2. 77 K. H1-0
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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/m1/4/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.